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35.
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Beam Based Measurements of Field Multipoles in the RHIC Low Beta Insertions and Extrapolation of the Method to the LHC
/ Koutchouk, Jean-Pierre ; Pilat, F ; Ptitsyn, V I
The multipolar content of the dipoles and quadrupoles is known to limit the stability of the beam dynamics in super-conducting machines like RHIC and even more in LHC. The low-beta quadrupoles are thus equipped with correcting coils up to the dodecapole order. [...]
CERN-SL-2001-051-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 1684
- Please contact the library if you need to access this document.
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38.
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Analysis and Measurement of coupling effects in the transfer line from PS to SPS for the LHC proton beam
/ Arduini, Gianluigi ; Chao, Y ; Giovannozzi, Massimo ; Klem, J T ; Manglunki, Django ; Martini, M
The tight emittance budget for injection into the LHC demands an accurate matching of the transfer line from the PS to the SPS to minimise blow-up at injection into the SPS. Precise two-dimensional beam profile measurements with Optical Transition Radiation (OTR) screens have recently pointed towards the presence of coupling in the LHC beam transfer. [...]
CERN-SL-2001-047-OP; CERN-PS-2001-019-AE.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 3144
- Please contact the library if you need to access this document.
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40.
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The measurement of Q' and Q'' in the CERN-SPS by head-tail phase shift analysis
/ Jones, R ; Schmickler, Hermann
A so-called "Head-Tail" chromaticity measurement system has recently been installed in the CERN-SPS, which allows the chromaticity (Q') to be calculated from several hundred turns of data after transverse excitation. The measurement relies on the periodic dephasing and rephasing that occurs between the head and tail of a single bunch for non-zero chromaticity. [...]
CERN-SL-2001-020-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 531
5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.79
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42.
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The CLIC Study of Magnet Stability and Time-dependent Luminosity Performance
/ Aleksa, Martin (CERN) ; Assmann, R W (CERN) ; Coosemans, Williame (CERN) ; Guignard, Gilbert (CERN) ; Leros, Nicolas (CERN) ; Mayoud, Michel (CERN) ; Redaelli, S (CERN) ; Ruggiero, F (CERN) ; Russenschuck, Stephan (CERN) ; Schulte, Daniel (CERN) et al.
The present parameters of the CLIC study require the collision of small emittance beams with a vertical spot size of 1 nm. The tolerances on vertical quadrupole vi-bration (above a few Hz) are as small as a few nm in the linac and most of the Final Focus. [...]
CERN-SL-2001-045-AP; CLIC-Note-495.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 3774
- Please contact the library if you need to access this document.
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43.
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Simulation of single bunch instabilities driven by electron cloud in the SPS
/ Rumolo, Giovanni ; Zimmermann, Frank
Photoemission, or gas ionization, and secondary emission can give rise to a quasi-stationary electron cloud inside the beam pipe through a beam-induced multipacting process. We investigate single bunch instabilities driven by a quasi-stationary electron cloud by means of a computer simulation. [...]
CERN-SL-2001-041-AP.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 1886
- Please contact the library if you need to access this document.
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44.
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Electron cloud studies for KEKB
/ Rumolo, Giovanni ; Zimmermann, Frank ; Fukuma, H ; Ohmi, K
Electron-cloud build up, incoherent tune spread and electron-induced beam instability are likely to be responsible for the vertical beam-size increase observed at the KEKB Low Energy Ring (LER). We report on recent simulations and analytical estimated, a ddressing the electron-cloud evolution for various magnet configurations, computing the beam size blow up predicted by three different simulation models (micro-bunches, multiparticle tracking with soft Gaussian approximation, particle-in cell) and finally discussing analytical expressions for the instability threshold..
CERN-SL-2001-040-AP.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 1889
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45.
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A study of fast bunch rotation in the negative mass region
/ Rumolo, Giovanni ; Hofmann, I
Fast bunch rotation of high-intensity proton or ion bunches above transition is - in principle - supported by the self-bunching effect of the attractive space charge force ("negative instabilities"). Due to the broad-band nature of the space charge impedance, the highest harmonics of this negative mass mode grow fast and inhibit compression, unless the bunch rotation is accelerated by a sufficiently high rf-voltage. [...]
CERN-SL-2001-042-AP.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 2875
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47.
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Measurement of Driving Terms
/ Schmidt, F ; Tomás, R ; Faus-Golfe, A
In 2000 a series of MDs has been performed at the SPS to measure resonance driving terms. Theory predicts that these terms can be determined by harmonic analysis of BPM data recorded after applying single kicks at various amplitudes. [...]
CERN-SL-2001-039-AP.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 437
- Please contact the library if you need to access this document.
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48.
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Measurements of the SPS transverse impedance in 2000
/ Arduini, Gianluigi ; Burkhardt, H ; Cornelis, Karel ; Klem, J T ; Zimmermann, Frank ; Zorzano-Mier, M P
We report on measurements of coherent tune shifts, head-tail growth rates, and current-dependent betatron phase advances at the CERN SPS in the year 2000. Comparing results obtained at two different energies shows that there is no notable contribution from space charge. [...]
CERN-SL-2001-037-AP.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 2054
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49.
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Overview of the CLIC Collimation design
/ Assmann, R W (CERN) ; Burkhardt, H (CERN) ; Fartoukh, Stéphane David (CERN) ; Jeanneret, J B (CERN) ; Pancin, J (CERN) ; Redaelli, S (CERN) ; Risselada, Thys (CERN) ; Zimmermann, Frank (CERN) ; Schreiber, H J (DESY)
The collimation system of the Compact Linear Collider (CLIC) should simultaneously fulfill three different functions. It must (1) provide adequate halo collimation to render the detector background acceptable, (2) ensure collimator survival and machine protection against mis-steered beams, and (3) not significantly amplify incoming trajectory fluctuations via the collimator wake fields. [...]
CERN-SL-2001-036-AP; CLIC-Note-493.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 4071
- Please contact the library if you need to access this document.
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50.
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Failure modes in CLIC
/ Schulte, Daniel (CERN) ; Zimmermann, Frank
Several CLIC failure modes may cause beam loss at colimators between the linac and the collision point. Studying sample failures by computer simulation, we derive performance requirements for the CLIC collimation system. [...]
CERN-SL-2001-034-AP; CLIC-Note-492.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 4068
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51.
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The crossing angle in CLIC
/ Schulte, Daniel (CERN) ; Zimmermann, Frank
Lower limits on the crossing angle at the interaction-point (IP) of the compact linear collider (CLIC) are set by the multi-bunch kink instability, which, at 3 TeV centre-of-mass energy, is strongly affected by coherent pairs. Aperture requirements for the spent beam introduce a second limitation. [...]
CERN-SL-2001-043-AP; CERN-PS-2001-038-AE; CLIC-Note-484.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 148
- Please contact the library if you need to access this document.
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52.
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The electron cloud instability : summary of measurements and understanding
/ Zimmermann, Frank
Electron-cloud effects presently limit the performance of several accelerators operating with high beam current, notably the SLAC and KEK B factories, the CERN SPS, the CERN PS, and the Los Alamos PSR. They are a major concern for many future projects, e.g. [...]
CERN-SL-2001-035-AP.-
Geneva : CERN, 2001 - 6 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 666
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53.
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Damping rings for CLIC
/ Jowett, John M (CERN) ; Risselada, Thys (CERN) ; Zimmermann, Frank (CERN) ; Owen, H (Daresbury)
The Compact Linear Colider (CLIC) is designed to operate at 3 TeV centre-of-mass energy with a total luminosity of 10^35 cm^-2 s^-1. The overall system design leads to extremely demanding requirements on the bunch trains injected into the main libac at frequency of 100 Hz. [...]
CERN-SL-2001-038-AP; CLIC-Note-494.-
Geneva : CERN, 2001 - 3 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 4065
- Please contact the library if you need to access this document.
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55.
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First Beam Tests for the Prototype LHC Orbit and Trajectory System in the CERN-SPS
/ Cocq, D ; Jensen, L ; Jones, R ; Savioz, J J ; Bishop, D ; Roberts, B ; Waters, G
The first beam tests for the prototype LHC orbit and trajectory system were performed during the year 2000 in the CERN-SPS. The system is composed of a wide-bande time normaliser, which converts the analogue pick-up signals into a 10 bit position at 40 MHz, and a digital acquisition board, which is used to process and store the relevant data. [...]
CERN-SL-2001-030-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.207
- Please contact the library if you need to access this document.
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57.
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Control Modules for Scintillation Counters in the SPS Experimental Areas
/ Baribaud, Guy ; Beugnet, C ; Cojan, A ; Ferri, G ; Fullerton, J ; Manarin, A ; Spanggaard, J
The hardware used in the SPS Experimental Areas to control the beam instrumentation electronics and mechanics of the particle detectors is based on CAMAC and NIM modules. The maintenance of this hardware now presents very serious problems. [...]
CERN-SL-2001-028-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.195
- Please contact the library if you need to access this document.
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58.
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LHC Beam Loss Monitors
/ Arauzo-Garcia, A ; Dehning, Bernd (CERN) ; Ferioli, G ; Gschwendtner, E
At the Large Hadron Collider (LHC) a beam loss system will be installed for a continuous surveillance of particle losses. These beam particles deposit their energy in the super-conducting coils leading to temperature increase, possible magnet quenches and damages. [...]
CERN-SL-2001-027-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.198
- Please contact the library if you need to access this document.
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59.
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Sensitivity Studies with the SPS Rest Gas Profile Monitor
/ Ferioli, G ; Fischer, C ; Koopman, J ; Sillanoli, M
During the SPS run in the year 2000 further test measurements were performed with the rest gas monitor. First, profiles of single circulating proton bunches were measured and the bunch charge progressively reduced, in order to determine the smallest bunch intensity which can be scanned under the present operating conditions. [...]
CERN-SL-2001-026-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.201
- Please contact the library if you need to access this document.
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61.
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New development of a Radiation-Hard Polycrystalline CdTe Detector for LHC Luminosity Monitoring
/ Rossa, E ; Schmickler, Hermann ; Brambilla, A ; Mongellaz, F ; Verger, L
Detectors presently considered for monitoring and control of the LHC luminosity will sample the hadronic/electromagnetic showers produced by neutrons and photons in copper absorbers designed to protect the superconducting magnets from quenching. At this location the detectors will have to withstand extreme radiation levels and their long term operation will have to be assured without requiring human intervention. [...]
CERN-SL-2001-024-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.94
- Please contact the library if you need to access this document.
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63.
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Accuracy of the LEP Spectrometer Beam Orbit Monitors
/ Barbero, E ; Dehning, Bernd (CERN) ; Prochnow, J ; Bergoz, J ; Unser, K ; Matheson, J ; Torrence, E
At the LEP e+/e- collider, a spectrometer is used to determine the beam energy with a target accuracy of 10-4. The spectrometer measures the lattice dipole bending angle of the beam using six beam position monitors (BPMs). [...]
CERN-SL-2001-022-BI.-
Geneva : CERN, 2001 - 4 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.165
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65.
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Excitation of Large Transverse Beam Oscillations without Emittance Blow-up using the AC-Dipole Principle
/ Berrig, O E ; Höfle, Wolfgang ; Jones, R ; Koopman, J ; Koutchouk, Jean-Pierre ; Schmickler, Hermann ; Schmidt, F
The so-called "AC-Dipole" principle allows the excitation of transverse oscillations to large (several sigma) excursions without emittance blow-up. The idea was originally proposed and tested at BNL for resonance crossing with polarized beams, using an orbit corrector dipole with an excitation frequency close to the betatron tune, hence "AC-Dipole". [...]
CERN-SL-2001-019-BI.-
Geneva : CERN, 2001 - 3 p.
Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 5th European Workshop on Diagnostics and Beam Instrumentation, Grenoble, France, 13 - 15 May 2001, pp.82
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66.
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Increasing the Proton Intensity of PS and SPS
/ Cappi, R ; Cornelis, Karel ; Delahaye, J P ; Garoby, R ; Haseroth, H ; Hübner, K ; Linnecar, Trevor Paul R ; Myers, S ; Schindl, Karlheinz ; Wyss, C
Recently, a series of meetings were organised with PS and SPS participants, to discuss the possibilities of increasing the proton intensity on the SPS targets (with particular emphasis to CNGS) as well as ISOLDE and nTOF. [...]
CERN-PS-2001-041-AE ; CERN-SL-2001-032.
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2001. - 17 p.
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67.
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Ultimate Performance of the LEP RF System
/ Brown, P ; Brunner, O C ; Butterworth, A ; Ciapala, Edmond ; Frischholz, Hans ; Geschonke, Günther ; Peschardt, E ; Sladen, Jonathan P H
The LEP Superconducting RF system reached its maximum configuration of 288 four-cell cavities powered by 36 klystrons in 1999. In 2000, this system, together with 56 cavities of the original copper RF system, routinely provided more than 3630 MV, allowing the beam energy to be raised up to 104.5 GeV. [...]
CERN-SL-2001-018-HRF.-
Geneva : CERN, 2001 - 5 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 1059
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68.
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Report on the Working Group set up to Study the Requirements for Operating the SPS within the INB Framework (INBOPS)
/ Ball, A ; Billen, R ; Charavay, R ; Elsener, K ; Faugier, A ; Jacot, C ; Jirdén, L ; Menzel, Hans Gregor ; Pajunen, J ; Poole, John et al.
The convention signed with the French authorities for the LHC defines a new Installation Nucléaire de Base (INB). [...]
CERN-SL-2001-017-MR.
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2001. - 38 p.
Access to fulltext document - Access to fulltext document
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76.
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Wake field and transverse mode coupling instability caused by electron cloud
/ Ohmi, K (KEK, Tsukuba) ; Zimmermann, Frank (CERN) ; Perevedentsev, E A (Novosibirsk, IYF)
In positron and proton storage rings, electrons produced by photo-emission, ionization and secondary emission accumulate in the vacuum chamber during multi-bunch operation with close spacing. A positron or proton bunch passing through this `electron cloud' experiences a force similar to a short-range wake field. [...]
CERN-SL-2001-011-AP.-
Geneva : CERN, 2001 - 12 p.
Report
Fulltext: PDF;
In : 18th International Conference on High-energy Accelerators, Tsukuba, Japan, 26 - 30 Mar 2001, pp.TU-10
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77.
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Final-Focus Schemes for CLIC at 3 TeV
/ Zimmermann, Frank (CERN) ; Burkhardt, H (CERN) ; Risselada, Thys (CERN) ; Schmidt, F (CERN) ; Schreiber, H J (DESY)
We discuss benefits and drawbacks of two different final-focus schemes for CLIC at 3 TeV centre-of-mass (c.m.) energy, by examining tolerances, tunability and potential background for a 3.3-km long baseline final-focus system and a shorter advanced design..
CERN-SL-2001-010-AP; CLIC-Note-476.-
Geneva : CERN, 2001 - 11 p.
Report
Fulltext: PDF; Published version: PDF;
In : 18th International Conference on High-energy Accelerators, Tsukuba, Japan, 26 - 30 Mar 2001, pp.P1lc04
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78.
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Luminosity Limitations at Hadron Colliders
/ Zimmermann, Frank (CERN)
I discuss fundamental luminosity limitations at hadron colliders, addressing head-on and long-range beam-beam interaction, empirical scaling, synchrotron radiation, intrabeam scattering, dynamic evolution during the store, flat beams, heat load, power consumption, and electron cloud. Parameters of past or operating colliders - ISR, SPS, Tevatron, RHIC -, are compared with the LHC and further extrapolated to an LHC upgrade and to the VLHC..
CERN-SL-2001-009-AP.-
Geneva : CERN, 2001 - 13 p.
Report
Fulltext: PDF; Published version: PDF;
In : 18th International Conference on High-energy Accelerators, Tsukuba, Japan, 26 - 30 Mar 2001, pp.TU-08
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81.
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Transverse Behaviour of the LHC Proton Beam in the SPS : an Update
/ Arduini, Gianluigi ; Cornelis, Karel ; Höfle, Wolfgang ; Rumolo, Giovanni ; Zimmermann, Frank
During the 1999 SPS run, strong transverse instabilities were observed with the LHC beam [1]. Both the instability characteristics and the identical threshold current as for beam-induced electron multipacting led to consider the interaction of the beam with the electron cloud as a likely source. [...]
CERN-SL-2001-050-OP.-
Geneva : CERN, 2001 - 4 p.
Report
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 1883
- Please contact the library if you need to access this document.
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