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3.
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Observation of Octupole Driven Resonance Phenomena with Space Charge at the CERN Proton Synchrotron
/ Métral, E ; Giovannozzi, Massimo ; Martini, M ; Steerenberg, R ; Franchetti, Giuliano ; Hofmann, I
Several benchmarking space charge experiments have been performed during the last few years in the CERN Proton Synchrotron. These controlled experiments are of paramount importance to validate the present very powerful simulation codes. [...]
CERN-AB-2006-003.-
2006
- Published in : Nucl. Instrum. Methods Phys. Res., A 561 (2006) 257-265
Access to fulltext document: PDF;
In : Workshop on High Intensity Beam Dynamics, Senigallia, Italy, 12 - 16 Sep 2005, pp.257-265
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10.
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Resonant Multi-Turn Extraction : Principle and Experiments
/ Gilardoni, S S (CERN) ; Giovannozzi, Massimo ; Martini, M ; Métral, E ; Scaramuzzi, P ; Steerenberg, R ; Muller, AS
Recently a novel approach to perform multi-turn extraction was proposed based on beam splitting in the transverse phase space by means of trapping inside stable islands. In addition to numerical simulations, aimed at assessing the feasibility of the proposed technique, an experimental campaign was launched since the year 2002 at the CERN Proton Synchrotron. [...]
CERN-AB-2006-022.-
Geneva : CERN, 2006 - 9 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 561 (2006) 249-256
Access to fulltext document: PDF;
In : Workshop on High Intensity Beam Dynamics, Senigallia, Italy, 12 - 16 Sep 2005, pp.249-256
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13.
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Resonance Trapping, Halo Formation and Incoherent Emittance Growth due to Electron Cloud
/ Benedetto, Elena ; Franchetti, Giuliano ; Rumolo, Giovanni (CERN) ; Zimmermann, Frank (CERN)
The pinched electron cloud introduces a tune shift along the bunch, which, together with synchrotron motion, leads to a periodic crossing of resonances. The resonances are excited by the longitudinal distribution of the electron cloud around the storage ring. [...]
CERN-AB-2006-039; CARE-Conf-06-031-HHH; CARE-Conf-2006-031-HHH.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2820
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14.
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Implementation of the proposed multi-turn extraction at the CERN Proton Synchrotron
/ Giovannozzi, Massimo (CERN)
Following the positive results of the three-year measurement campaign at the CERN Proton Synchrotron, concerning beam splitting with stable islands in the transverse phase space, a study of a possible implementation of the proposed Multi-Turn Extraction (MTE) was undertaken. The novel approach would allow a substantial reduction of beam losses, with respect to the present scheme, when delivering the high-intensity proton beams required for the planned CERN Neutrino to Gran Sasso Project (CNGS). [...]
CERN-AB-2006-045.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1789
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15.
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Kicker impedance measurements for the future multiturn extraction of the CERN Proton Synchrotron
/ Métral, Elias (CERN) ; Caspers, Friedhelm (CERN) ; Giovannozzi, Massimo (CERN) ; Grudiev, Alexei (CERN) ; Kroyer, Tom (CERN) ; Sermeus, Luc (CERN)
In the context of the novel multi-turn extraction, where charged particles are trapped into stable islands in transverse phase space, the ejection of five beamlets will be performed by means of a set of three new kickers. Before installing them into the machine, a measurement campaign has been launched to evaluate the impedance of such devices. [...]
CERN-AB-2006-051.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2919
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17.
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The Fast Vertical Single-Bunch Instability after Injection into the CERN Super Proton Synchrotron
/ Métral, Elias (CERN) ; Arduini, Gianluigi (CERN) ; Bohl, Thomas (CERN) ; Burkhardt, Helmut (CERN) ; Rumolo, Giovanni (CERN) ; Spataro, Bruno (INFN/LNF Frascati)
Since 2003, high-intensity single-bunch proton beams with low longitudinal emittance have been affected by heavy losses after less than one synchrotron period after injection. The effects of the resonance frequency of the responsible impedance, longitudinal emittance and chromaticity on the intensity threshold were already discussed in detail in 2004, comparing analytical predictions with simulation results. [...]
CERN-AB-2006-053.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2913
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18.
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Design and Validation with Measurements of the LEIR Injection Line
/ Roncarolo, F ; Carli, C ; Chanel, M ; Dumas, L ; Scrivens, R
The CERN Low Energy Ion Ring (LEIR) commissioning started in the year 2005. O4+and Pb54+ion beams are transferred at 4.2 MeV/nucleon from Linac 3 to LEIR through a low energy transfer line, for which the constraints and the resulting optics design are presented. [...]
CERN-AB-2006-057.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2020
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19.
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Tune shift induced by nonlinear resistive wall wake field of flat collimator
/ Zimmermann, Frank (CERN) ; Arduini, Gianluigi ; Assmann, R W ; Burkhardt, H ; Caspers, Friedhelm ; Gasior, M ; Jones, R ; Kroyer, T ; Métral, E ; Redaelli, S et al.
We present formulae for the coherent and incoherent tune shifts due to the nonlinear resistive wall wake field for a single beam traveling between two parallel plates. In particular, we demonstrate that the nonlinear terms of the resistive-wall wake field become important if the gap between the plates is comparable to the transverse rms beam size. [...]
CERN-AB-2006-070.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2925
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20.
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First observation of proton reflection from bent crystals
/ Scandale, Walter ; Ivanov, Yu M ; Petrunin, A ; Skorobogatov, V V ; Gavrikov, Yu A ; Zhelamkov, A V ; Lapina, L P ; Schetkovsky, A I ; Chesnokov, Yu A ; Baranov, V I et al.
We recently suggested using short bent crystals as primary collimators in a two stage cleaning system for hadron colliders, with the aim of providing larger impact parameters in the secondary bulk absorber, through coherent beam-halo deflection [1]. Tests with crystals a few mm long, performed with 70 GeV proton beams at IEHP in Protvino, showed a channeling efficiency exceeding 85 %. [...]
CERN-AT-2006-007-MAS.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1535
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21.
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CERN Proton Synchrotron working point control using an improved version of the pole-face-windings and figure-of-eight loop powering
/ Burnet, Jean Paul ; Giovannozzi, Massimo ; Métral, E ; Michels, O ; Steerenberg, R ; Vandorpe, B
The working point of the CERN Proton Synchrotron, which is equipped with combined function magnets, is controlled using pole-face-windings. Each main magnet consists of one focusing and one de-focusing half-unit on which four pole-face-winding plates are mounted containing two separate coils each, called narrow and wide. [...]
CERN-AB-2006-065.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.264
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33.
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AB Recruitment Requests for 2009
/ Matheys, J-P
As a first step towards the elaboration of a comprehensive manpower plan for AB Department, personnel needs put forth by AB Groups were critically reviewed by the Departmentâs Management Board (ABMB) to establish a list of recruitment requests for 2009 which could be accommodated within the likely personnel allocations for the years 2009-2011. [...]
CERN-AB-Note-2008-029.
-
2008. - 16 p.
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35.
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Modelling of Quench Limit for Steady State Heat Deposits in LHC Magnets
/ Bocian, D (CERN) ; Dehning, B (CERN) ; Siemko, A (CERN)
A quench, the transition of a conductor from the superconducting to the normal conducting state, occurs irreversibly in the accelerator magnets if one of the three parameters: temperature, magnetic field or current density exceeds a critical value. Energy deposited in the superconductor by the particle beams provokes quenches detrimental for the accelerator operation. [...]
CERN-AB-2008-006.-
Geneva : CERN, 2008 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 18 (2008) 112-115
IEEE published version, local copy: PDF; Preprint: PDF;
In : 20th International Conference on Magnet Technology, Philadelphia, PA, USA, 27 - 31 Aug 2007, pp.112-115
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50.
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Experimental Studies on Drive Beam Generation in CTF3
/ Corsini, R (CERN) ; Bettoni, S (CERN) ; Biscari, C (Frascati) ; Chao, Y (Jefferson Lab) ; Döbert, S (CERN) ; Ghigo, A (Frascati) ; Tecker, F (CERN) ; Skowronski, P (CERN)
The objective of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. CTF3 consists of a 150 MeV electron linac followed by a 42 m long delay loop, an 84 m combiner ring and a two-beam test area. [...]
CERN-AB-2008-029; CLIC-Note-751.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP010
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53.
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Energy Loss of Coasting Gold Ions and Deuterons in RHIC
/ Abreu, N P (Brookhaven) ; Blaskiewicz, M (Brookhaven) ; Brown, K (Brookhaven) ; Burkhardt, H (CERN) ; Butler, J (Brookhaven) ; Fischer, W (Brookhaven) ; Harvey, M (Brookhaven) ; Tepikian, S (Brookhaven)
The total energy loss of coasting gold ion beams at two different energies and deuterons at one energy were measured at RHIC, corresponding to a gamma of 75.2, 107.4 and 108.7 respectively. We describe the experiment and observations and compare the measured total energy loss with expectations from ionization losses at the residual gas, the energy loss due to impedance and synchrotron radiation. [...]
CERN-AB-2008-031.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPP001
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54.
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Fitting Algorithms for Optical and Beam Parameters in Transfer Lines with Application to the LHC Injection Line T12
/ Benedetto, E (CERN) ; Agapov, I (CERN) ; Follin, F (CERN) ; Kain, V (CERN)
As part of the commissioning with beam of the transfer line TI2 and TI8 from the SPS to the LHC [1], a series of optics measurements has been conducted. The paper presents the results in terms of Twiss parameters (including the dispersion), emittance and momentum spread obtained from the combination of trajectory and beam profile measurements. [...]
CERN-AB-2008-032.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPP057
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57.
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4 GeV H- Charge Exchange Injection into the PS2
/ Goddard, B (CERN) ; Bartmann, W (CERN) ; Benedikt, M (CERN) ; Kramer, T (CERN) ; Koschik, A (CERN)
The proposed PS2 will accelerate protons from 4 to 50 GeV. The required beam intensity and brightness can only be achieved with a multi-turn H- charge exchange injection system, where the small emittance injected beam is used to paint the transverse phase space of the PS2 machine. [...]
CERN-AB-2008-034.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THPP087
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58.
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Design Considerations for the PS2 Beam Dumps
/ Kramer, T (CERN) ; Benedikt, M (CERN) ; Goddard, B (CERN) ; Vincke, H (CERN)
The different beam dump functionalities required for the proposed PS2 machine and its transfer lines are briefly described, followed by first estimates about the expected beam loads. This data has been taken as input for comparing the different technical options for the dump systems, in particular to simulate the radiological impact for internal or external beam dump options. [...]
CERN-AB-2008-035.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THPP088
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59.
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Septa and Distributor Developments for H- Injection into the Booster from LINAC4
/ Borburgh, J (CERN) ; Balhan, B (CERN) ; Fowler, T (CERN) ; Hourican, M (CERN) ; Weterings, W (CERN)
The construction of Linac4 requires the modification of the existing injection system of the CERN PS Booster. A new transfer line will transport 160 MeV H- ions to this machine. [...]
CERN-AB-2008-036.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPC141
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60.
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Gamma Transition Jump for PS2
/ Bartmann, W (CERN) ; Benedikt, M (CERN) ; Métral, E (CERN) ; Möhl, D (CERN) ; Peggs, S (Brookhaven)
The PS2, which is proposed as a replacement for the existing ~50-year old PS accelerator, is presently considered to be a normal conducting synchrotron with an injection kinetic energy of 4 GeV and a maximum energy of 50 GeV. One of the possible lattices (FODO option) foresees crossing of transition energy near 10 GeV. [...]
CERN-AB-2008-037.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THPP089
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62.
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Progress in the Beam preparation for the Multi-Turn Extraction at the CERN Proton Synchrotron
/ Gilardoni, S (CERN) ; Franchi, A (CERN) ; Giovannozzi, M (CERN)
A new type of extraction based on beam trapping inside stable islands in the horizontal phase space will become operational during 2008 at the CERN Proton Synchrotron. A series of beam experiments was carried out to prove lossless capture with high intensity and multi-bunched beams, up to $1.5 × 10^{13}$ protons per pulse, in preparation of the extraction commissioning. [...]
CERN-AB-2008-039.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THPC049
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63.
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Experimental Evidence of Beam Trapping with one-third and one-fifth Resonance Crossing
/ Gilardoni, S (CERN) ; Franchi, A (CERN) ; Giovannozzi, M (CERN)
Beam trapping in stable islands of the horizontal phase space generated by non-linear magnetic fields is realized by means of a given tune variation so to cross a resonance of order n. Whenever the resonance is stable, n + 1 beamlets are created whereas if the resonance is unstable, the beam is split in n parts. [...]
CERN-AB-2008-040.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THPC050
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64.
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A Storage Ring based Option for the LHeC
/ Willeke, F (Brookhaven) ; Bordry, Frederick (CERN) ; Braun, H H (CERN) ; Brüning, Oliver Sim (CERN) ; Burkhardt, H (CERN) ; Chattopadhyay, S (Cockcroft Inst. Accel. Sci. Tech.) ; Dainton, J B (Cockcroft Inst. Accel. Sci. Tech.) ; Holzer, B (DESY) ; Jowett, John M (CERN) ; Klein, M (Liverpool U.) et al.
The LHeC aims at the generation of hadron-lepton collisions with center of mass energies in the TeV scale and luminosities of the order of $10^{32}-10^{33} cm^{-2} sec^{-1}$ by taking advantage of the existing LHC 7 TeV proton ring and adding a high energy electron accelerator. This paper presents technical considerations and potential parameter choices for such a machine and outlines some of the challenges arising when an electron storage ring based option, constructed within the existing infrastructure of the LHC, is chosen..
CERN-AB-2008-041.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPP052
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65.
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Technical Specification for the CLIC Two-Beam Module
/ Riddone, G (CERN) ; Mainaud-Durand, H (CERN) ; Nousiainen, R (Helsinki Inst. of Phys.) ; Samoshkin, A (Dubna, JINR) ; Schulte, D (CERN) ; Syratchev, I (CERN) ; Wuensch, W (CERN) ; Zennaro, R (CERN)
A high-energy (0.5-3 TeV centre-of-mass), highluminosity Compact Linear Collider (CLIC) is being studied at CERN [1]. The CLIC main linacs, 21-km long each, are composed of 2-m long two beam modules. [...]
CERN-AB-2008-042; CLIC-Note-744.-
Geneva : CERN, 2008 - 3 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP028
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67.
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Advanced Experimental Techniques for RF and DC Breakdown Research
/ Kovermann, J W (RWTH Aachen U. ; CERN) ; Calatroni, S (CERN) ; Descoeudres, A (CERN) ; Lefèvre, T (CERN) ; Wuensch, W (CERN)
Advanced experimental techniques are being developed to analyze RF and DC breakdown events. First measurements with a specially built spectrometer have been made with a DC spark setup [1] at CERN and will soon be installed in the CLIC 30GHz accelerating structure test stand to allow comparison between DC and RF breakdown phenomena. [...]
CERN-AB-2008-044; CLIC-Note-746.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP095
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68.
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CLIC Accelerating Structure Development
/ Wuensch, W (CERN)
One of the most important objectives of the CLIC (Compact Linear Collider) study is to demonstrate the design accelerating gradient of 100 MV/m in a fully featured accelerating structure under nominal operating conditions including pulse length and breakdown rate. The main issues which must be addressed and their interrelations are described along with the development and testing programs which have been put into place to accomplish this feasibility demonstration..
CERN-AB-2008-045; CLIC-Note-740.-
Geneva : CERN, 2008 - 6 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THXM01
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71.
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CERN PSB Beam Tests of CNAO Synchrotron's Digital LLRF
/ Angoletta, M E (CERN) ; Bourrion, O (LPSC, Grenoble) ; De Martinis, C (Milan U. ; INFN, Milan) ; Falbo, L (CNAO, Pavia) ; Findlay, A (CERN) ; Foglio, R (LPSC, Grenoble) ; Hunt, S (CNAO, Pavia) ; Tourres, D (LPSC, Grenoble) ; Vescovi, C (LPSC, Grenoble)
The Italian National Centre for Oncological hAdrontherapy (CNAO), in its final construction phase, uses proton and carbon ion beams to treat patients affected by solid tumours. At the heart of CNAO is a 78- meter circumference synchrotron that accelerates particles to up to 400 MeV/u. [...]
CERN-AB-2008-048.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPC154
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72.
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Beam Coupling Impedance Measurement and Mitigation for a TOTEM Roman Pot
/ Deile, Mario (CERN) ; Caspers, Fritz (CERN) ; Kroyer, Tom (CERN) ; Oriunno, Marco (CERN) ; Radermacher, Ernst (CERN) ; Soter, Anna (CERN) ; Roncarolo, Federico (Manchester U.)
The longitudinal and transverse beam coupling impedance of the first final TOTEM Roman Pot unit has been measured in the laboratory with the wire method. For the evaluation of transverse impedance the wire position has been kept constant, and the insertions of the RP were moved asymmetrically. [...]
arXiv:0806.4974; EPAC08-TUPP029; CERN-AB-2008-049.-
Geneva : CERN, 2008 - 3 p.
- Published in : Conf. Proc. C: 0806233 (2008) , pp. TUPP029
Fulltext: PDF; Preprint: PDF; External link: Full-text at JACoW Server
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPP029
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73.
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Electron Cloud Mitigation by Fast Bunch Compression in the CERN PS
/ Damerau, H (CERN) ; Hancock, S (CERN) ; Kroyer, T (CERN) ; Mahner, E (CERN) ; Schokker, M (CERN)
A fast transverse instability has been observed with nominal LHC beams in the CERN Proton Synchrotron (PS) in 2006. The instability develops within less than 1 ms, starting when the bunch length decreases below a threshold of 11.5 ns during the RF procedure to shorten the bunches immediately prior to extraction. [...]
CERN-AB-2008-050.-
Geneva : CERN, 2008 - 4 p.
Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPP050
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76.
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The Merit(nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS
/ Efthymiopoulos, I (CERN) ; Bennett, J R J (Rutherford) ; Caretta, O (Rutherford) ; Carroll, A J (Oak Ridge) ; Fabich, A (CERN) ; Graves, V B (Oak Ridge) ; Grudiev, A (CERN) ; Haug, F (CERN) ; Kirk, H G (Brookhaven) ; Lettry, Jacques (CERN) et al.
The MERIT(nTOF-11) experiment is a proof-ofprinciple test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of $30 × 10^{12}$ per pulse. [...]
CERN-AB-2008-053.-
Geneva : CERN, 2008 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPC087
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77.
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Development, Production and Testing of 4500 Beam Loss Monitors
/ Holzer, E B (CERN) ; Chiggiato, P (CERN) ; Dehning, B (CERN) ; Ferioli, G (CERN) ; Grishin, V (Serpukhov, IHEP) ; Jimenez, T M (CERN) ; Koshelev, A (Serpukhov, IHEP) ; Kramer, Daniel (CERN) ; Larionov, A (Serpukhov, IHEP) ; Taborelli, M (CERN) et al.
Beam-loss monitoring (BLM) [1] is a key element in the LHC machine protection. 4250 nitrogen filled ionization chambers (IC) and 350 secondary emission monitors (SEM) have been manufactured and tested at the Institute for High Energy Physics (IHEP) in Protvino, Russia, following their development at CERN. [...]
CERN-AB-2008-054.-
Geneva : CERN, 2008 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPC037
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79.
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Development of an Eddy Current Septum for LINAC4
/ Barnes, M (CERN) ; Balhan, B (CERN) ; Borburgh, J (CERN) ; Fowler, T (CERN) ; Goddard, B (CERN) ; Ueda, A (KEK Japan) ; Weterings, W (CERN)
A linear accelerator (linac) is the first stage of the CERN accelerator complex. The linac defines the beam quality for subsequent stages of acceleration and the reliability has to be high as a fault of the linac shuts down all other machines. [...]
CERN-AB-2008-056.-
Geneva : CERN, 2008 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPD002
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80.
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Upgrading the Fast Extractions Kicker System in SPS LSS6
/ Barnes, M (CERN) ; Ducimetière, L (CERN) ; Goddard, B (CERN) ; Uythoven, J (CERN)
A fast extraction system, located in the LSS6 region of the CERN SPS accelerator, transfers 450 GeV/c protons, as well as ions, via the TI 2 transfer line towards the LHC. The system includes three travelling wave kicker magnets, all powered in series, energised by a single Pulse Forming Network (PFN) and terminated by a short circuit. [...]
CERN-AB-2008-057.-
Geneva : CERN, 2008 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPD003
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81.
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Ions for LHC : Towards Completion of the Injector Chain
/ Manglunki, Django (CERN) ; Albert, M (CERN) ; Angoletta, M E (CERN) ; Arduini, Gianluigi (CERN) ; Baudrenghien, P (CERN) ; Bellodi, G (CERN) ; Belochitskii, P (CERN) ; Benedetto, E (CERN) ; Bohl, T (CERN) ; Carli, C (CERN) et al.
The commissioning of CERN's ion injector complex [1] to allow 1.1 PeV collisions of ions in LHC is well under way. After the Low Energy Ion Ring (LEIR) in 2005 [2] and the Proton Synchrotron (PS) in 2006 [3], the Super Proton Synchrotron (SPS) has now been commissioned with the 'Early' ion beam, which should give a luminosity of $5×10^{25}cm^{-2}s^{-1}$ in the LHC. [...]
CERN-AB-2008-058.-
Geneva : CERN, 2008 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPC131
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86.
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Choice of Frequency, Gradient and Temperature for a Superconducting Proton Linac
/ Gerigk, F (CERN) ; Brunner, O (CERN) ; Calatroni, S (CERN) ; Ciapala, Edmond (CERN) ; Eshraqi, M (CERN) ; Garoby, R (CERN) ; Lombardi, A M (CERN) ; Losito, R (CERN) ; Parma, V (CERN) ; Tückmantel, Joachim (CERN) et al.
The construction of a Superconducting Proton Linac is planned at CERN during the next decade. [...]
CERN-AB-2008-064.
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2008. - 8 p.
Preprint
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89.
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Plans for a Superconducting H$^{-}$ LINAC (SPL) at CERN
/ Brunner, O (CERN) ; Calatroni, S (CERN) ; Ciapala, Edmond (CERN) ; Garoby, R (CERN) ; Gerigk, F (CERN) ; Lombardi, A M (CERN) ; Losito, R (CERN) ; Parma, V (CERN) ; Rossi, C (CERN) ; Tückmantel, Joachim (CERN) et al.
As part of the upgrade of the LHC injector complex at CERN, the construction of a 4 GeV Superconducting Proton Linac (the SPL, in fact an H- accelerator) is planned to begin in 2012. [...]
CERN-AB-2008-066-BI.
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2008. - 4 p.
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91.
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Assessment of the basic parameters of the CERN Superconducting Proton Linac
/ Brunner, O (CERN) ; Calatroni, S (CERN) ; Ciapala, Edmond (CERN) ; Eshraqi, M (Tehran, IPM) ; Garoby, R (CERN) ; Gerigk, F (CERN) ; Lombardi, A (CERN) ; Losito, R (CERN) ; Parma, V (CERN) ; Rossi, C (CERN) et al.
The construction of a 4GeV Superconducting Proton Linac (the SPL) is now part of the Long Term Plan of CERN, and the construction of Linac4, its low-energy front end, has begun. For mid-2011 the existing conceptual design of the SPL has to be refined and transformed into a project proposal. [...]
CERN-AB-2008-067-BI-FR.-
Geneva : CERN, 2009 - 35 p.
- Published in : Phys. Rev. Spec. Top. Accel. Beams 12 (2009) 070402
APS Published version, local copy: PDF; Preprint: PDF;
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94.
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Horn Operational Experience in K2K, MiniBooNE, NuMI and CNGS
/ Pardons, A (CERN)
/ATB
This paper gives an overview of the operation and experience gained in the running of magnetic horns in conventional neutrino beam lines (K2K, MiniBooNE, NuMI and CNGS) over the last decade. Increasing beam power puts higher demands on horn conductors but even more on their hydraulic and electrical systems, while the horn environment itself becomes more hostile due to radiation. [...]
CERN-AB-Note-2008-049.-
Geneva : CERN, 2008 - 5 p.
- Published in : PoS: Nufact08 (2008) , pp. 096
Access to fulltext: PDF; Published version from PoS: PDF;
In : 10th International Workshop on Neutrino Factories, Superbeams and Betabeams, Valencia, Spain, 30 Jun - 05 Jul 2008, pp.096
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97.
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High Power test of a low group velocity X-band Accelerator Structure for CLIC
/ Döbert, S (CERN) ; Grudiev, A (CERN) ; Riddone, G (CERN) ; Taborelli, M (CERN) ; Wuensch, W (CERN) ; Zennaro, R (CERN) ; Fukuda, S (KEK, Tsukuba) ; Higashi, Y (KEK, Tsukuba) ; Higo, T (KEK, Tsukuba) ; Matsumoto, S (KEK, Tsukuba) et al.
In recent years evidence has been found that the maximum sustainable gradient in an accelerating structure depends on the rf power flow through the structure. [...]
CERN-AB-2008-069 ; CLIC-Note-767.
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2008. - 4 p.
Preprint
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104.
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Study of Low Work Function Materials for Hot Cavity Resonance Ionization Laser Ion Sources
/ Catherall, R (CERN) ; Crepieux, B (CERN) ; Fedosseev, V (CERN) ; Marsh, B (CERN) ; Mattolat, C (Mainz U., Inst. Phys.) ; Menna, Mariano (CERN) ; Österdahl, F (Royal Inst. Tech., Stockholm) ; Raeder, S (Mainz U., Inst. Phys.) ; Schwellnus, F (Mainz U., Inst. Phys.) ; Stora, T (CERN) et al.
The selectivity of a hot cavity resonance ionization laser ion source (RILIS) is most often limited by contributions from competing surface ionization on the hot walls of the ionization cavity. [...]
CERN-AB-Note-2008-056-ATB.
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2008. - 13 p.
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115.
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Prospects for a Large Hadron Electron Collider (LHeC) at the LHC
/ Klein, M (Liverpool U.) ; Aksakal, H (Nigde U.) ; Bordry, F (CERN) ; Braun, H H (CERN) ; Brüning, Oliver Sim (CERN) ; Burkhardt, H (CERN) ; Chattopadhyay, S (Cockcroft Inst. Accel. Sci. Tech.) ; Çiftçi, A K (Middle East Tech. U., Ankara) ; Dainton, J B (Cockcroft Inst. Accel. Sci. Tech.) ; de Roeck, A (CERN) et al.
Sub-atomic physics at the energy frontier probes the structure of the fundamental quanta of the Universe. The Large Hadron Collider (LHC) at CERN opens for the first time the “terascale” (TeV energy scale) to experimental scrutiny, exposing the physics of the Universe at the subattometric (~10^-19 m, 10^-10 as) scale. [...]
CERN-LHeC-Note-2008-003 ACC.-
Geneva : CERN, 2008 - 3 p.
Access to fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEOAG01
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121.
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LEIR : The low energy ion ring at CERN
/ Chanel, M
Amongst all the modifications of the PS Complex to produce the LHC ion beams, the conversion of the old Low Energy Antiproton Ring (LEAR) into the Low Energy Ion Ring (LEIR) is a major issue. The accumulation in LEIR of 9*108 Lead ions in normalized transverse emittances of 0.7 mm allows the production of 4 of the 592 bunches needed in one LHC ring, in one LEIR cycle. [...]
CERN-PS-2002-015-AE; CERN-AB-2003-086-ABP.-
Geneva : CERN, 2004 - 9 p.
Low and Intermediate Energy Proton and Ion Accelerators and Sources
Access to fulltext document: ab-2003-086 - PDF; ps-2002-015 - PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.563-5
International Workshop on Beam Cooling and Related Topics, Yamanashi, Japan, 19 - 23 May 2003, pp.137-143
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127.
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Comparison of the TESLA, NLC and CLIC Beam Collimation Systems Performance
/ Drozhdin, A I (Fermilab) ; Blair, G A (London, City U.) ; Keller, L (SLAC) ; Kozanecki, Witold (Saclay) ; Markiewicz, T W (SLAC) ; Maruyama, T (SLAC) ; Mokhov, N V (Fermilab) ; Napoly, O (Saclay) ; Raubenheimer, T O (SLAC) ; Schulte, Daniel (CERN) et al.
This note describes studies performed in the framework of the Collimation task Force organized to support work of the International Linear Collider Technical Review Committee aiming in comparison of performance of the post-linac beam collimation systems in TESLA, JLC/NLC and CLIC linear collider designs. Collimation of the beam halo and synchrotron radiation collimation have been compared for all projects using the same computer code and same assumptions. [...]
CERN-AB-2003-006-ABP; CLIC-Note-555; DESY-TESLA-2003-02; FERMILAB-TM-2200; LCC-NOTE-0111.-
Geneva : CERN, 2003 - 54 p.
- Published in : AIP Conf. Proc. 693 (2003) 200-204
Fulltext: PDF;
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129.
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Workshop on LHC performance - Chamonix XII
3 - 8 Mar 2003
- Chamonix, France
/ Poole, John (ed.) (CERN)
The workshop in 2003 was the second in the series devoted to the LHC and was composed of 11 half day sessions. It started with a session devoted to the injector chain which was followed by a session devoted to ions throughout the whole facility. [...]
Geneva : CERN, 2003 - 380 p.
CERN-AB-2003-008-ADM
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132.
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Colliding Nanobeams in CLIC with Magnets Stabilized to the Sub-nm Level
/ Redaelli, Stefano (CERN) ; Guignard, G (CERN) ; Assmann, R W (CERN) ; Schulte, D (CERN) ; Coosemans, W (CERN) ; Wilson, I (CERN) ; Zimmermann, F (CERN)
The Compact Linear Collider (CLIC) aims at colliding e^+e^- beams at 1:5 TeV with effective transverse spot sizes of 60nm (horizontal) times 0:7nm (vertical). Strict stability tolerances must be respected in order to achieve a sufficient overlap of the two colliding beams [...]
CERN-AB-2003-011-ABP; CLIC-Note-562.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.665
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133.
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Optimum Choice of RF Frequency for Two Beam Linear Colliders
/ Braun, Hans Heinrich (CERN) ; Schulte, Daniel (CERN)
Recent experimental results on normal conducting RF structures indicate that the scaling of the gradient limit with frequency is less favourable than what was believed. We therefore reconsider the optimum choice of RF frequency and iris aperture for a normal conducting, two-beam linear collider with E_CMS=3 TeV, a loaded accelerating gradient of 150 MV/m and a luminosity of 8 10^34 cm-^2 s^-1. [...]
CERN-AB-2003-012-ABP; CLIC-Note-563.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2721
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135.
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Coherent tune shifts measured with few bunches in the SPS and comparison with resistive wall theory
/ Burkhardt, H (CERN) ; Koschik, A ; Rumolo, Giovanni (CERN) ; Zimmermann, Frank (CERN) ; Zotter, Bruno W (CERN)
Coherent tune shifts with current have been measured in the SPS with single bunches and two bunches at varying distances between them. The measurements showed the usual negative slope with intensity in the vertical plane and a small positive one in the horizontal direction. [...]
CERN-AB-2003-014-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3044
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136.
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Optics Studies for the CERN Proton Synchrotron Machine : Linear and Nonlinear Modelling using Beam Based Measurements
/ Cappi, R (CERN) ; Giovannozzi, Massimo ; Martini, M ; Métral, Elias ; Métral, G (CERN) ; Steerenberg, R ; Müller, A S
The CERN Proton Synchrotron machine is built using combined function magnets. The control of the linear tune as well as the chromaticity in both planes is achieved by means of special coils added to the main magnets, namely two pole-face-windings and one figure-of-eight loop. [...]
CERN-AB-2003-017-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2913
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138.
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Parallel Computation of Beam-Beam Interactions including Longitudinal Motion
/ Herr, Werner ; Jones, F W
In beam-beam macroparticle simulations for collider rings, the accurate determination of the incoherent spectrum and potentially unstable coherent modes requires (1) large numbers of collisions, and (2) accurate electric field solutions at each collision. On single processor, a self consistent simulation typically uses a 2D model of the beam-beam interaction in order to achieve a reasonable computation time, however for the long (~0.3m) bunches in the LHC we wish to include the 3rd dimension in order to account for effects such as longitudinal motion, crossing angle, and the beam size and density variations. [...]
CERN-AB-2003-019-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3404
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139.
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Nonlinear Optimization of a Low Emittance CLIC Damping Ring Lattice
/ Korostelev, Maxim S (CERN) ; Zimmermann, Frank (CERN)
The CLIC damping ring design is optimized to produce a beam with ultra low emittances. The lattice for such a machine requires a small value of the optical functions, a large number of compact arc cells and, for the chromatic correction, strong sextupoles, that introduce significant nonlinearities, decreasing the dynamic aperture. [...]
CERN-AB-2003-020-ABP; CLIC-Note-564.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2315
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141.
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Measurements of Transverse Space-Charge Effects in the CERN Proton Synchrotron
/ Giovannozzi, Massimo ; Martini, M ; Métral, Elias ; Métral, G (CERN) ; Steerenberg, R
Several beam dynamics codes are used in the design of the next generation of high beam power accelerators. They are all capable of simulating the full six-dimensional motion through a machine lattice in the presence of strong space-charge effect and beam-to-wall interaction. [...]
CERN-AB-2003-022-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2916
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142.
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Nonlinear Resonance Benchmarking Experiment at the CERN Proton Synchrotron
/ Hofmann, I ; Franchetti, Giuliano (GSI, Darmstadt) ; Giovannozzi, Massimo ; Martini, M ; Métral, Elias
As a first step of a space charge - nonlinear resonance benchmarking experiment over a large number of turns, beam loss and emittance evolution were measured over 1 s on a 1.4 GeV kinetic energy flat-bottom in the presence of a single octupole. By lowering the working point towards the resonance a gradual transition from a loss-free core emittance blow-up to a regime dominated by continuous loss was found. [...]
CERN-AB-2003-023-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.129
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146.
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Effects of Dynamic Misalignements and Feedback Performance on Luminosity Stability in Linear Colliders
/ Seryi, Andrei (SLAC) ; Hendrickson, L ; Raubenheimer, T O ; Tenenbaum, P G ; Woodley, M ; Schulte, Daniel (CERN)
The performance of high energy linear colliders depends critically on the stability with which they can maintain the collisions of nanometer-size beams. Ground motion and vibration, among other effects, will produce dynamic misalignments which can offset the beams at the collision point. [...]
CERN-AB-2003-027-ABP; CLIC-Note-583.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.662
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147.
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Damping Ring to Interaction Point Beam Transport Issues
/ Walker, N (DESY) ; Schulte, Daniel (CERN) ; Wolski, A (LBL, Berkeley) ; Tenenbaum, P G (SLAC) ; Seryi, Andrei (SLAC) ; Woodley, M (SLAC)
One of the major challenges facing the proposed high-energy linear e^+e^ colliders is the preservation of the extremely small vertical emittance from the damping rings to the interaction point (IP). This emittance must be transported through bunch compression sections, the main linac and finally through the beam delivery system to the IP. [...]
CERN-AB-2003-028-ABP; CLIC-Note-584.-
Geneva : CERN, 2003 - 6 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.657
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149.
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2002 Nonlinear Optics Measurements and Modelling for the CERN SPS
/ Faus-Golfe, Angeles ; Tomas, Rogelio ; Arduini, Gianluigi ; Zimmermann, Frank
In 2002, nonlinear chromaticity, coupling, amplitude-dependent detuning, chromatic phase advance, resonance driving terms, and off-energy orbits were measured in the CERN SPS at 26 GeV/c. The optics model has been updated by adjusting the strengths of nonlinear field errors in the dipoles and quadrupoles, so as to reproduce the measured nonlinear chromaticity. [...]
CERN-AB-2003-030-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2240
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154.
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Simulation Study of Coupled-Bunch Instabilities due to Resistive Wall, Ions, or Electron Cloud
/ Zimmermann, Frank ; Fukuma, H ; Ohmi, K ; Ohnishi, Y ; Win, S S
We simulate the interaction of a bunch train with either an external wake field, (semi-)trapped ions in a field-free region or in a dipole field, or an electron cloud, on successive turns, using a simplified algorithm with only a small number of macro-particles. We present simulated mode spectra and rise times for the ensuing coupled-bunch instabilities, and show that observations at the KEKB HER are consistent with a horizontal instability driven by carbon monoxide ions in a region without magnetic field..
CERN-AB-2003-035-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3056
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155.
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Beam-Beam Interaction, Electron Cloud and Intrabeam Scattering for Proton Super-bunches
/ Ruggiero, F ; Zimmermann, Frank ; Rumolo, Giovanni ; Papaphilippou, Y
Super-bunches are long bunches with a flat longitudinal profile, which could potentially increase the LHC luminosity in a future upgrade. We present example parameters and discuss a variety of issues related to such superbunches, including beam-beam tune shift, tune footprints, crossing schemes, luminosity, intrabeam scattering, and electron cloud. [...]
CERN-AB-2003-037-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF;
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.123-5
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156.
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Comparison of the TESLA, NLC and CLIC Beam-Collimation System Performance
/ Walker, N (DESY) ; Kozanecki, Witold (Saclay) ; Napoly, O (Saclay) ; Schulte, Daniel (CERN) ; Zimmermann, Frank (CERN) ; Drozhdin, A I (Fermilab) ; Mokhov, N V (Fermilab) ; Keller, L (SLAC) ; Markiewicz, T W (SLAC) ; Maruyama, T (SLAC) et al.
This report describes studies performed in the framework of the Collimation Task Force organized to support the work of the second International Linear Collider Technical Review Committee. The post-linac beam-collimation systems in the TESLA, JLC/NLC and CLIC linear-collider designs are compared using the same computer code under the same assumptions. [...]
CERN-AB-2003-038-ABP; CLIC-Note-586.-
Geneva : CERN, 2004 - 4 p.
- Published in : AIP Conf. Proc.: 693 (2004) , pp. 200-204
Access to fulltext document: PDF; External link: Published version from AIP
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2739
29th ICFA Advanced Beam Dynamics Workshop on Beam-Halo Dynamics, Diagnostics and Collimation in conjunction with The Beam-Beam Workshop, Montauk, NY, USA, 19 - 23 May 2003, pp.200-204
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158.
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Upgrades to the Digital Receiver based Low-Intensity Beam Diagnostics for CERN AD
/ Angoletta, Maria Elena ; Belohrad, D ; Bojtar, L ; Findlay, A ; Ludwig, M ; Marqversen, O ; Pedersen, F
The CERN AD Low-Intensity Beam Multi-Diagnostics (LIMD) has been upgraded as planned since 2001 by adding tune measurements during ramps and plateaus, based on the Beam Transfer Function (BTF) method. This relies on transversally exciting the beam by a deflector and deriving the BTF and coherence function from FFTs of excitation and beam response recorded by digital receivers (DRX). [...]
CERN-AB-2003-040-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2461
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159.
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Final Results on the CERN PS Electrostatic Septa Consolidation Program
/ Borburgh, Jan ; Balhan, Bruno ; Bobbio, Piero ; Carlier, Etienne ; Hourican, Michael ; Masson, Thierry ; Müller, Tania ; Prost, Antoine ; Crescenti, Massimo
The CERN PS electrostatic septum consolidation program is coming to completion after almost 4 years of development. The program was started to fulfil the increased requirements on vacuum performance and the need to reduce the time necessary for maintenance interventions. [...]
CERN-AB-2003-041-BT.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1643
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160.
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Bunch Frequency Multiplication in the CLIC Test Facility CTF3
/ Tecker, F A (CERN) ; Corsini, R (CERN) ; Rinolfi, Louis (CERN) ; Biscari, C (Frascati) ; Ghigo, A (Frascati) ; Preger, M (Frascati) ; Royer, P (Lausanne U.) ; Ferrari, A (Uppsala U.)
The aim of the CLIC Test Facility CTF3 at CERN is to prove the feasibility of key issues of the two-beam based Compact Linear Collider (CLIC) study. In particular, it addresses the generation of a drive beam with the appropriate time structure to produce high power RF pulses at a frequency of 30 GHz. [...]
CERN-AB-2003-042-OP; CLIC-Note-565.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.684
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161.
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Operation of the LEP CW Klystrons in Pulsed Mode
/ Frischholz, Hans ; Valuch, D
For possible future accelerator projects, as, e. g., the Super-Conducting Proton Linac, SPL, at CERN, it would be desirable to reuse as much of the LEP/RF equipment as possible. [...]
CERN-AB-2003-043-RF.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF PS; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1089
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162.
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Progress in the Design of a Damped and Tapered Accelerating Structure for CLIC
/ Raguin, J Y (CERN) ; Wilson, Ian H (CERN) ; Wuensch, Walter (CERN)
Two of the main requirements for CLIC 30 GHz accelerating structures are an average accelerating gradient of 150 MV/m and features which suppress long-range transverse and longitudinal wakefields. The main effects that constrain the design of a copper structure are a surface electric field limit of about 300 MV/m, from evidence produced by the CLIC high-gradient testing program, and a pulsed surface heating temperature rise limit estimated to be of the order of 100 K. [...]
CERN-AB-2003-045-RF; CLIC-Note-567.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2724
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163.
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All Digital IQ Servo-System for CERN Linacs
/ Rohlev, A ; Serrano, J ; Garoby, R
A new VME based system has been developed and built at CERN for the servo loops regulating the field in the linac accelerating structure. It makes use of high speed digital In-phase/Quadrature (IQ) detection, digital processing, and digital IQ modulation. [...]
CERN-AB-2003-046-RF.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.2336
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164.
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Construction and Testing of a 21 GHz Ceramic Based Power Extractor
/ Newsham, D (DULY Res. Inc., Rancho Palos Verdes) ; Braun, H (CERN) ; Carron, G (CERN) ; Döbert, Steffen (CERN) ; Gai, W (Argonne) ; Konecny, R (Argonne) ; Liu, W (Argonne) ; Smirnov, A Yu (DULY Res. Inc., Rancho Palos Verdes) ; Thorndahl, L (CERN) ; Wilson, Ian H (CERN) et al.
A ceramic based power extractor [1] operating at 21 GHz was built by DULY Research Inc. and tested at CTF2, the CERN Linear Collider (CLIC) Test Facility. [...]
CERN-AB-2003-047-RF; CLIC-Note-568.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1156
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165.
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A Demonstration of High-Gradient Acceleration
/ Achard, Claude (CERN) ; Braun, Hans Heinrich (CERN) ; Döbert, Steffen (CERN) ; Syratchev, I V (CERN) ; Taborelli, M (CERN) ; Wilson, Ian H (CERN) ; Wuensch, Walter (CERN)
One priority of the CLIC (Compact Linear Collider) accelerating-structure development program has been to investigate ways to achieve accelerating gradients above 150 MV/m. Two main concepts to achieve such high gradients have emerged: reduced surface field geometries and the use of alternative materials. [...]
CERN-AB-2003-048-RF; CLIC-Note-569.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.495
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168.
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Transverse "Monopole" Instability Driven by Electron Cloud?
/ Benedetto, Elena (CERN) ; Schulte, Daniel (CERN) ; Zimmermann, Frank (CERN) ; Ohmi, K (KEK, Tsukuba) ; Papaphilippou, Y (ESRF, Grenoble) ; Rumolo, Giovanni (GSI, Darmstadt)
We simulate the long-term emittance growth of a proton beam due to an electron cloud of moderate density. This emittance growth is sometimes characterized by a rapid blow up of the bunch tail, and it appears to be different from the strong head-tail instability, which is observed at higher electron densities. [...]
CERN-AB-2003-036-ABP.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.3053
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169.
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Bench Measurements of Low Frequency Transverse Impedance
/ Caspers, Friedhelm (CERN) ; Iriso-Ariz, U (BNL, Upton, New York) ; Mostacci, A (Univ. Roma)
For frequencies below 10 MHz the classical two wire transmission line method is subject to difficulties in sensitivity and measurement uncertainties. Thus for evaluation of the low frequency transverse impedance properties of the LHC dump kicker a modified version of the two wire transmission line has been used. [...]
CERN-AB-2003-051-RF.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1801
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170.
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Adiabatic Beam Trapping in Stable Islands of Transverse Phase Space : Measurement Results at CERN Proton Synchrotron
/ Cappi, R (CERN) ; Giovannozzi, Massimo (CERN) ; Martini, M (CERN) ; Métral, M (CERN) ; Métral, G (CERN) ; Steerenberg, R (CERN) ; Müller, A S (ISS, Forschungszentrum Karlsruhe, Germany)
Recently a novel approach to the problem of multi-turn extraction was proposed. It consists of splitting the beam by adiabatic capture inside stable islands created in the transverse phase space by sextupoles and octupoles. [...]
CERN-AB-2003-015-ABP.-
Geneva : CERN, 2003 - 3 p.
Access to fulltext document: PDF;
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.388-90
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173.
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Real Time Management of the AD Schottky/BTF Beam Measurement
/ Angoletta, Maria Elena (CERN) ; Ludwig, M (CERN)
The AD Schottky and BTF system relies on rapid acquisition and analysis of beam quantisation noise during the AD cycle which is based on an embedded receiver and digital signal processing board hosted in a VME system. The software running in the VME sets up the embedded system and amplifiers, interfaces to the RF and control system, manages the execution speed and sequence constraints with respect to the various operating modes, schedules measurements during the AD cycle and performs post processing taking into account the beam conditions in an autonomous way. [...]
CERN-AB-2003-054-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Access to published document
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.104
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176.
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The LHC Orbit and Trajectory System
/ Bishop, D (TRIUMF) ; Boccard, C (CERN) ; Calvo-Giraldo, E (CERN) ; Cocq, D (CERN) ; Jensen, L (CERN) ; Jones, R (CERN) ; Savioz, J J (CERN) ; Waters, G (TRIUMF)
This paper describes the definitive acquisition system selected for the measurement of the closed orbit and trajectory in the CERN-LHC and its transfer lines. The system is based on a Wide Band Time Normaliser (WBTN) followed by a 10-bit ADC and a Digital Acquisition Board (DAB), the latter developed by TRIUMF, Canada. [...]
CERN-AB-2003-057-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Access to published document
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.187
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182.
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OTR from Non-Relativistic Electrons
/ Bal, C (CERN) ; Bravin, Enrico (CERN) ; Chevallay, E (CERN) ; Lefèvre, T (CERN) ; Suberlucq, Guy (CERN)
The CLIC Test Facility 3 (CTF3) injector will provide pulsed beams of high average current; 5A over 1.56µs at 140keV. For transverse beam sizes of the order of 1mm, as foreseen, this implies serious damage to the commonly used scintillating screens. [...]
CERN-AB-2003-062-BDI; CLIC-Note-574; CTF-3-NOTE-057.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from GSI
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.95
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183.
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Cavity Mode Related Wire Breaking of the SPS Wire Scanners and Loss Measurements of Wire Materials
/ Caspers, Friedhelm (CERN) ; Dehning, Bernd (CERN) ; Jensen, E (CERN) ; Koopman, J (CERN) ; Malo, J F (CERN) ; Roncarolo, F (CERN)
During the SPS high intensity run 2002 with LHC type beam, the breaking of several of the carbon wires in the wire scanners has been observed in their parking position. The observation of large changes in the wire resistivity and thermionic electron emission clearly indicated strong RF heating that was depending on the bunch length. [...]
CERN-AB-2003-067-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Access to published document
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.119
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187.
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Beam Studies Made with the SPS Ionization Profile Monitor
/ Ferioli, G ; Fischer, C ; Koopman, J ; Roncarolo, F
During the last two years of SPS operation, investigations were pursued on the ability of the SPS ionization profile monitor prototype to fulfill different tasks. It is now established that the instrument can be used for injection matching tuning, by turn to turn recording of the beam size after the injection. [...]
CERN-AB-2003-066-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Access to published document
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.116
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188.
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Ionization Chambers for the LHC Beam Loss Detection
/ Assmann, R W (CERN) ; Dehning, Bernd (CERN) ; Ferioli, G (CERN) ; Gschwendtner, E (CERN) ; Kain, V (CERN)
At the Large Hadron Collider (LHC) a beam loss system will be used to prevent and protect superconducting magnets against coil quenches and coil damages. Ionisation chambers will be mounted outside the cryostat to measure the secondary shower particles caused by lost beam particles. [...]
CERN-AB-2003-068-BDI.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Access to published document
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.245
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192.
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Comparative assessment of simulation tools for beam delivery systems of linear colliders
/ Redaelli, S (CERN) ; Assmann, R W (CERN) ; Burkhardt, H (CERN) ; Schulte, Daniel (CERN) ; Zimmermann, Frank (CERN) ; Walker, N (DESY) ; Nosochkov, Yu M (SLAC) ; Raubenheimer, T O (SLAC) ; Seryi, Andrei (SLAC) ; Tenebaum, P (SLAC)
In this paper, simulation codes for Beam Delivery Systems in linear colliders are discussed. Several tracking codes are available for particle tracking. [...]
CERN-AB-2003-072; CLIC-Note-577; SLAC-PUB-10069.-
Stanford, CA : SLAC, 2003 - 7 p.
Access to fulltext document: PDF; External link: Fulltext from SLAC
In : 26th Advanced ICFA Beam Dynamics Workshop on Nanometer Size Colliding Beams, Lausanne, Switzerland, 2 - 6 Sep 2002, pp.51-6
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195.
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Collimation for CLIC
/ Assmann, R W (CERN) ; Blair, G A (Royal Holloway, U. of London) ; Burkhardt, H (CERN) ; Fartoukh, Stéphane David (CERN) ; Faus-Golfe, A (Valencia U.) ; Jeanneret, J B (CERN) ; Pancin, J (CERN) ; Redaelli, S (CERN) ; Risselada, Thys (CERN) ; Schreiber, H J (DESY) et al.
The collimation system of the Compact Linear Collider (CLIC) must fulfil a number of conflicting requirements, namely it should (1) remove beam halo to reduce the detector background, (2) provide a minimum distance between collimators and collision point for muon suppression, (3) ensure collimator survival and machine protection against errand beam pulses, (4) not be excessively long, and (5) not amplify incoming trajectory fluctuations via the collimator wake fields. Two optical systems have been designed the first linear, the second non-linear , which promise to meet all these requirements for the design beam energy of 1.5 TeV. [...]
CERN-AB-2003-075; CLIC-Note-579.-
Geneva : CERN, 2004 - 5 p.
- Published in : AIP Conf. Proc. 693 (2004) 205-208
Access to fulltext document: PDF;
In : 29th ICFA Advanced Beam Dynamics Workshop on Beam-Halo Dynamics, Diagnostics and Collimation in conjunction with The Beam-Beam Workshop, Montauk, NY, USA, 19 - 23 May 2003, pp.205-208
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196.
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Halo Formation due to Beam-Beam Interaction
/ Zimmermann, Frank
In colliding-beam storage rings transverse and longitudinal beam halo is generated, or depleted, by the effect of head-on and long-range beam-beam collisions. Measurements from several past and present lepton or hadron colliders are compared with simulations and analytical models, highlighting a few halo-specific techniques. [...]
CERN-AB-2003-076-ABP.-
Geneva : CERN, 2004 - 7 p.
- Published in : AIP Conf. Proc. 693 (2004) 20-25
Access to fulltext document: PDF; External link: Access to fulltext document
In : 29th ICFA Advanced Beam Dynamics Workshop on Beam-Halo Dynamics, Diagnostics and Collimation in conjunction with The Beam-Beam Workshop, Montauk, NY, USA, 19 - 23 May 2003, pp.20-25
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199.
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Optimum Lattice Functions for Electron Cooling
/ Carli, Christian ; Bosser, Jacques ; Chanel, M ; Maury, S ; Möhl, D ; Tranquille, G
Cooling down time measurements carried out at LEAR with 4.2 MeV/nucleon Pb54+ ions and various combinations of lattice functions led to unexpected results. Notably, a finite dispersion was found to decrease strongly the horizontal cooling down times [...]
CERN-AB-2003-079-ABP.-
Geneva : CERN, 2004 - 9 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 532 (2004) 422-426
Access to fulltext document: PDF;
In : International Workshop on Beam Cooling and Related Topics, Yamanashi, Japan, 19 - 23 May 2003, pp.422-426
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200.
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Observations and simulation of a fourth order resonance with space charge
/ Giovannozzi, Massimo (CERN) ; Franchetti, Giuliano (GSI, Darmstadt) ; Hofmann, I (GSI, Darmstadt) ; Martini, M (CERN) ; Métral, Elias (CERN)
A benchmarking experiment with a high intensity bunched beam stored for 1.2 s in a nonlinear lattice has been performed at the CERN Proton Synchrotron (PS). Beam emittance and beam intensity have been measured for several working points at different distances from a lattice-induced resonance. [...]
CERN-AB-2003-080-ABP.-
Geneva : CERN, 2004 - 5 p.
- Published in : AIP Conf. Proc. 693 (2004) 73-76
Access to fulltext document: PDF; External link: Access to fulltext document
In : 29th ICFA Advanced Beam Dynamics Workshop on Beam-Halo Dynamics, Diagnostics and Collimation in conjunction with The Beam-Beam Workshop, Montauk, NY, USA, 19 - 23 May 2003, pp.73-76
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201.
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Achievement of ultra-low emittance beam in the ATF damping ring
/ Honda, Y ; Anderson, S ; Araki, S ; Bane, Karl Leopold Freitag ; Brachmann, A ; Frisch, J ; Fukuda, M ; Hasegawa, K ; Hayano, H ; Hendrickson, L et al.
We report on the smallest vertical emittance achieved in single-bunch-mode operation of the ATF. [...]
CERN-AB-2003-081-ABP ; KEK-2003-46 ; SLAC-PUB-10113.
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2003. - 7 p.
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206.
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Beam based alignment at LEP
/ Dehning, Bernd (CERN) ; Matheson, J (CERN) ; Mugnai, G (CERN) ; Reichel, I (CERN) ; Schmidt, R (CERN) ; Sonnemann, F (CERN) ; Tecker, F A (CERN)
We describe a beam-based method for finding the relative offset between beam position monitors (BPMs) and the magnetic centres of the adjacent quadrupole magnets. The strength of a given quadrupole is modulated and the induced closed orbit oscillation measured for different beam positions, reaching a minimum when the beam is centred in the quadrupole. [...]
CERN-AB-2003-087-BDI.-
Geneva : CERN, 2004 - 26 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 516 (2004) 9-20
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208.
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The Septum Magnet System of the New Fast Extraction Channel of the SPS at CERN
/ Balhan, B (CERN) ; Goddard, B (CERN) ; Rizzo, A (CERN) ; Weterings, W (CERN)
In the Long Straight Section LSS4 of the Super Proton Synchrotron (SPS) at CERN, a new fast extraction system has been installed in order to extract the beam to ring 2 of the Large Hadron Collider (LHC) and the CERN Neutrino to Gran Sasso facility (CNGS). The system consists of horizontal closed orbit bumper magnets, extraction kicker magnets, enlarged aperture quadrupoles and six conventional DC electromagnetic septum magnets (MSE). [...]
CERN-AB-2003-089-BT.-
Geneva : CERN, 2004 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 14 (2004) 429-432
Access to fulltext document: PDF; IEEE Published version, local copy: PDF;
In : 18th International Conference on Magnet Technology, Morioka, Japan, 20 - 24 Oct 2003, pp.429-432
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213.
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Losses of Protons during the Ramp
/ Sen, T (Fermi National Accelerator Laboratory, Batavia, IL) ; Schmidt, F (CERN) ; Moore, R (Fermi National Accelerator Laboratory, Batavia, IL) ; Shiltev, V (Fermi National Accelerator Laboratory, Batavia, IL)
Beam losses during the ramp in the Tevatron are significant in both species. [...]
CERN-AB-2003-094-ABP ; CERN-TEVATRON-BEAMS-DOC-535-V-1.
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2003. - 23 p.
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215.
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Development of a Bunch Frequency Monitor for the Preliminary Phase of the CLIC Test Facility CTF3
/ Caspers, Friedhelm (CERN) ; Corsini, R (CERN) ; Ferrari, A (UUS) ; Rinolfi, Louis (CERN) ; Royer, P (UNIL) ; Rydberg, A (UUS) ; Tecker, F A (CERN)
In the framework of the CLIC RF power source studies, the feasibility of the electron bunch train combination by injection with RF deflectors into an isochronous ring has been successfully demonstrated in the preliminary phase of CTF3. A new method, based on beam frequency spectrum analysis, was experimented to monitor this scheme. [...]
CERN-AB-2003-096-RF; CLIC-Note-587.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from GSI
In : 6th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Mainz, Germany, 5 - 7 May 2003, pp.211
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216.
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Magnetic Axis and Geometric Measurement for the LHC Cryomagnet
/ Bajko, M ; Charrondière, C ; García-Pérez, J ; Gorskaya, E A ; Koltin, G ; Rijllart, A
The LHC cryomagnets are made with several types of magnets which all need to be aligned. Both magnetic and geometric axis need to be well known before the installation in the LHC tunnel. [...]
CERN-AB-2003-097-CO.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th International Conference on Accelerator and Large Experimental Physics Control Systems, Gyeongju, Korea, 13 - 17 Oct 2003, pp.521
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