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1.
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High RF Power Production for CLIC
/ Syratchev, I (CERN) ; Schulte, D (CERN) ; Adli, E (CERN) ; Taborelli, M (CERN)
The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and excite preferentially the synchronous mode. The RF power produced (several hundred MW) is collected at the downstream end of the structure by means of the Power Extractor and delivered to the main linac structure [...]
CERN-AB-2007-059; CLIC-Note-720.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2194-2196
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2.
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30 GHz High-Gradient Accelerating Structure Test Results
/ Rodríguez, J (CERN) ; Aksakal, H (Ankara U.) ; Arnau-Izquierdo, G (CERN) ; Corsini, R (CERN) ; Döbert, S (CERN) ; Fandos, R (CERN) ; Grudiev, A (CERN) ; Johnson, M (Uppsala U.) ; Mete, O (Ankara U.) ; Nergiz, Z (Ankara U.) et al.
The CLIC study is high power testing accelerating structures in a number of different materials and accelerating structure designs to understand the physics of breakdown, determine the appropriate scaling of performance and in particular to find ways to increase achievable accelerating gradient. The most recent 30 GHz structures which have been tested include damped structures in copper, molybdenum, titanium and aluminum. [...]
CERN-AB-2007-058; CLIC-Note-719.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.3818-20
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3.
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High Power Test on an x-Band Slotted-Iris Accelerator Structure at NLCTA
/ Adolphsen, C (SLAC) ; Döbert, S (CERN) ; Fandos, R (CERN) ; Grudiev, A (CERN) ; Heikkinen, S (CERN) ; Laurent, L (SLAC) ; Rodríguez, José Alberto (CERN) ; Taborelli, M (CERN) ; Wuensch, W (CERN)
The CLIC study group at CERN has built two X-band HDS (Hybrid Damped Structure) accelerating structures for high-power testing in NLCTA at SLAC. These accelerating structures are novel with respect to their rf-design and their fabrication technique [...]
CERN-AB-2007-060; CLIC-Note-722.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2191-2193
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5.
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CTF3 Combiner Ring Commissioning
/ Tecker, F (CERN) ; Biscari, C (Frascati) ; Bressi, E (CNAO, Milan) ; Corsini, R (CERN) ; Döbert, S (CERN) ; Ferrari, A (CERN) ; Ghigo, A (Frascati) ; Skowronski, P (CERN) ; Urschütz, P (CERN)
The CLIC Test Facility 3 (CTF3) has the objective to demonstrate the remaining feasibility issues of the CLIC two-beam technology for a future multi-TeV linear collider. One key issue is the efficient generation of a very high current 'drive beam' that serves as the power source for the acceleration of the main beam to high energy. [...]
CERN-AB-2007-056; CLIC-Note-718.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2850
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7.
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A New Type of distributed Enamel based Clearing Electrode
/ Kroyer, T ; Behler, F J ; Caspers, Friedhelm ; Hellmond, P ; Métral, E ; Wendel, J C ; Zimmermann, F
Clearing electrodes can be used for electron cloud (EC) suppression in high intensity particle accelerators. In this paper the use of low and highly resistive layers on a dielectric substrate are examined. [...]
CERN-AB-2007-054.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2000
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9.
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Controlled Longitudinal Emittance Blow-Up in the CERN PS
/ Damerau, H ; Morvillo, M ; Shaposhnikova, E ; Tückmantel, Joachim ; Vallet, J L
The longitudinal emittance of the bunches in the CERN PS must be increased before transition crossing to avoid beam loss due to a fast vertical instability. This controlled blow-up is essential for all high-intensity beams in the PS, including those for transfer to the LHC. [...]
CERN-AB-2007-052.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.4186
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10.
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Longitudinal Coupled-Bunch Instabilities in the CERN PS
/ Damerau, H ; Hancock, S ; Mehler, M ; Rossi, C ; Shaposhnikova, E ; Tückmantel, Joachim ; Vallet, J L
Longitudinal coupled bunch instabilities in the CERN PS represent a major limitation to the high brightness beam delivered for the LHC. To identify possible impedance sources for these instabilities, machine development studies have been carried out. [...]
CERN-AB-2007-051.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.4180
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11.
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RF Structures for Linac4
/ Gerigk, F ; Alharbi, N ; Pasini, M ; Ramberger, S ; Vretenar, M ; Wegner, R
Linac4 is proposed to replace the existing proton linac at CERN (Linac2). Using an increased injection energy of 160 MeV instead of 50 MeV, Linac4 is expected to double the beam intensity in the PS Booster (PSB) and will thus be the first step towards higher brightness beams in the LHC. [...]
CERN-AB-2007-050.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.3821
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12.
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High Intensity Commissioning of the SPS LSS4 extraction for CNGS
/ Kain, V ; Carlier, E ; Gaxiola, E ; Goddard, B ; Gschwendtner, E ; Gourber-Pace, M ; Meddahi, M ; Vincke, H ; Vincke, H H ; Wenninger, J
The SPS LSS4 fast extraction system will serve both the anti-clockwise ring of the LHC and the CERN Gran Sasso Neutrino project (CNGS). CNGS requires 2 fast extractions of 10.5 microsecond long batches, 50 milliseconds apart. [...]
CERN-AB-2007-048.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.1604
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13.
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Optics Considerations for the PS2
/ Bartmann, W ; Benedikt, M ; Carli, C ; Goddard, B ; Hancock, S ; Jowett, John M ; Papahilippou, Y
CERN envisages replacing the existing Proton Synchrotron (PS) with a larger synchrotron (PS2) capable of injecting at higher energy into the SPS. Since it should increase the performance not only of the LHC but also CNGS and other users of beams from CERN's hadron injector complex, the new accelerator must retain much of the flexibility of the present complex. [...]
CERN-AB-2007-047.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.739
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14.
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Design and Performance of the CNGS Secondary Beam Line
/ Gschwendtner, E (CERN) ; Bruno, L (CERN) ; Elsener, K (CERN) ; Ferrari, A (CERN) ; Guglielmi, A (INFN Padova, Italy) ; Meddahi, M (CERN) ; Pardons, A (CERN) ; Rangod, Stephane (CERN) ; Sala, P (INFN Milano, Italy)
An intense muon-neutrino beam (1017nm /day) is generated at CERN and directed towards the Gran Sasso National Laboratory, LNGS, in Italy, 732 km away from CERN. In the presently approved physics programme, it is foreseen to run the CNGS facility with 4.5.1019 protons per year for five years. [...]
CERN-AB-2007-046.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.1601
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15.
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Halo Estimates and Simulations for Linear Colliders
/ Agapov, I (Royal Holloway, U. of London) ; Blair, G (Royal Holloway, U. of London) ; Burkhardt, H (CERN) ; Jackson, F (Daresbury) ; Latina, A (CERN) ; Neukermans, L (CERN) ; Schulte, D (CERN)
Halo simulations and estimates are important for the design of future linear accelerators. We describe the main processes with analytic estimates and present our generic simulations in application to the ILC..
CERN-AB-2007-045; CLIC-Note-714.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2041-2043
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16.
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160 MeV $H^-$ Injection into the CERN PSB
/ Weterings, W ; Bellodi, G ; Borburgh, J ; Fowler, T ; Gerigk, F ; Goddard, B ; Hanke, K ; Martini, M ; Sermeus, L
The H- beam from the proposed LINAC4 will be injected into the four existing rings of the PS Booster at 160 MeV. A substantial upgrade of the injection region is required, including the modification of the beam distribution system and the construction of a new H- injection system. [...]
CERN-AB-2007-043.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.1628
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17.
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Studies of Beam Losses from Failures of SPS Beam Dump Kickers
/ Kramer, T ; Arduini, Gianluigi ; Berrig, O ; Carlier, E ; Ducimetière, L ; Goddard, B ; Koschik, A ; Uythoven, J
The SPS beam dump extraction process was studied in detail to investigate the possibility of operation with reduced kicker voltage and to fully understand the trajectories and loss patterns of miss-kicked beam. This paper briefly describes the SPS beam dump process, and presents the tracking studies carried out for failure cases. [...]
CERN-AB-2007-042.-
Geneva : CERN, 2007 - 4 p.
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In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.1607
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18.
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PS2 Injection, Extraction and Beam Transfer Concepts
/ Bartmann, W ; Benedikt, M ; Goddard, B ; Kramer, T ; Koschik, A
The replacement of CERN's existing 26 GeV Proton Synchrotron (PS) machine with a separated-function synchrotron PS2 has been identified as an important part of the possible future upgrade programme of the CERN accelerator complex. The PS2 will require a number of new beam transfer systems associated with injection, extraction, beam dumping and transfer. [...]
CERN-AB-2007-041.-
Geneva : CERN, 2007 - 4 p.
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In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.1598
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19.
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Beam Loss Response Measurements with a LHC Prototype Collimator in the SPS
/ Weiler, Th ; Arduini, Gianluigi ; Assmann, Ralph Wolfgang ; Bracco, C ; Braun, H ; Dehning, B ; Gander, P ; Holzer, E B ; Jonker, M ; Losito, R et al.
Beam tests with a Large Hadron Collider (LHC) prototype collimator were performed at the Super Proton Synchrotron (SPS) in autumn 2006. [...]
CERN-AB-2007-040.
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2007. - 4 p.
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20.
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CERN Neutrinos to Gran Sasso (CNGS) : Results from Commissioning
/ Meddahi, M ; Cornelis, K ; Elsener, K ; Gschwendtner, E ; Herr, Werner ; Kain, V ; Lamont, M ; Wenninger, J
/CNGS Commissioning Team
The CNGS project (CERN Neutrinos to Gran Sasso) aims at directly detecting nm - nt oscillations. An intense nm beam is generated at CERN and directed towards LNGS (Laboratori Nazionali del Gran Sasso) in Italy where nt will be detected in large and complex detectors. [...]
CERN-AB-2007-039.-
Geneva : CERN, 2007 - 4 p.
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In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.692
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21.
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Beam Loss Map Simulations and Measurements in the CERN PS.
/ Barranco, J ; Berrig, O ; Gilardoni, S ; Jeanneret, B ; Robert-Démolaize, G ; Papaphilippou, Y
Numerical tools providing detailed beam loss maps, recently developed for the design of the Large Hadron Collider (LHC) collimation system, were adapted to low energy synchrotrons. Using a MADX optics sequence model, these tools are able to track a large number of particles with SixTrack and interact with a realistic aperture model to simulate particle losses all around the ring. [...]
CERN-AB-2007-038.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.3372
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22.
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Fast Vertical Single-bunch Instability at Injection in the CERN SPS : An Update
/ Arduini, Gianluigi (CERN) ; Bohl, T (CERN) ; Burkhardt, H (CERN) ; Métral, E (CERN) ; Rumolo, G (CERN) ; Salvant, B (EFPL, Lausanne, Switzerland ; CERN)
Following the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed in order to assess the resulting potential intensity limitations for the SPS, as well as possible cures. During the 2006 run, the characteristics of this instability were studied further, extending the intensity range of the measurements, and comparing the experimental data with simulations that take into account the latest measurements of the transverse machine impedance. [...]
CERN-AB-2007-037.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.4162
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23.
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Modeling Incoherent Electron Cloud Effects
/ Benedetto, E ; Fischer, W ; Franchetti, G ; Rumolo, G ; Ohmi, K ; Pivi, M ; Raubenheimer, T O ; Schulte, D ; Sonnad, K ; Tomás, R et al.
Incoherent electron effects could seriously limit the beam lifetime in proton or ion storage rings, such as LHC, SPS, or RHIC, or blow up the vertical emittance of positron beams, e.g., at the B factories or in linear-collider damping rings. Different approaches to modeling these effects each have their own merits and drawbacks. [...]
CERN-AB-2007-036; CARE-Conf-07-013-HHH; CARE-Conf-2007-013-HHH.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF; Fulltext: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.3393
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24.
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Bunch Compressor for Beam-Based Alignment
/ Latina, A (CERN) ; Eliasson, P (Uppsala U.) ; Schulte, D (CERN)
Misalignments in the main linac of future linear colliders can lead to significant emittance growth. Beam-based alignment algorithms, such as Dispersion Free Steering (DFS), are necessary to mitigate these effects. [...]
CERN-AB-2007-035; CLIC-Note-713.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2844
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25.
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Feedback Studies
/ Latina, A (CERN) ; Rumolo, G (CERN) ; Schulte, D (CERN) ; Tomás, R (CERN)
Dynamic imperfections in future linear colliders can lead to a significant luminosity loss. We discuss different orbit feedback strategies in the main linac that can mitigate the emittance dilution and compare their efficiency. [...]
CERN-AB-2007-034; CLIC-Note-715.-
Geneva : CERN, 2007 - 4 p.
Fulltext: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2841
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26.
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Wakefield models for particle tracking codes
/ Latina, A (CERN) ; Barlow, R J (Manchester U.) ; Blair, G (Royal Holloway, U. of London) ; Bungau, A (Manchester U.) ; Malton, S (Royal Holloway, U. of London) ; Rumolo, G (CERN) ; Schulte, D (CERN) ; Smith, J D A (Lancaster U.)
Wakefields have a considerable effect on beam dynamics and they must not be neglected for emittance growth studies, background estimates and other problems. The codes used for these problems are normally not capable of self-consistent wakefield calculations. [...]
CERN-AB-2007-033; CLIC-Note-711.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.3378
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27.
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Simulation study of the horizontal head-tail instability observed at injection of the CERN Proton Synchrotron
/ Métral, E (CERN) ; Rumolo, G (CERN) ; Salvant, B (EPFL, Lausanne ; CERN) ; Steerenberg, R (CERN)
For many years, a horizontal head-tail instability has been observed at the CERN Proton Synchrotron during the long 1.2 s injection flat-bottom. This slow instability has been damped using linear coupling only, i.e. [...]
CERN-AB-2007-032.-
Geneva : CERN, 2007 - 4 p.
Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.4210
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