Paper |
Title |
Page |
MOPP038 |
Optimizing the CLIC Beam Delivery System
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631 |
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- R. Tomas
BNL, Upton, Long Island, New York
- H.-H. Braun, M. Jorgensen, D. Schulte
CERN, Geneva
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The optimization of the new CLIC Final Focus System (FFS) with L*=3.5m is presented for a collection of CLIC beam parameters. The final performance is computed for the full Beam Delivery System including the new diagnostics section. A comparison to previous designs is also presented.
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MOPP060 |
Parameter Scan for the CLIC Damping Rings
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679 |
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- Y. Papaphilippou, H.-H. Braun, M. Korostelev
CERN, Geneva
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Triggered by the RF frequency reduction of the CLIC main linac cavities, the damping ring parameters had to be reevaluated and the rings' performance adapted to the new luminosity requirements. In view of a staged approach for reaching the ultimate energy of the collider, the dependence of the rings output emittances under the influence of Intrabeam Scattering is evaluated with respect to different beam characteristics such as bunch population, beam energy, coupling and longitudinal beam characteristics.
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WEOAG01 |
Prospects for a Large Hadron Electron Collider (LHeC) at the LHC
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1903 |
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- M. Klein
Liverpool University, Science Faculty, Liverpool
- H. Aksakal
N. U, Nigde
- F. Bordry, H.-H. Braun, O. S. Brüning, H. Burkhardt, R. Garoby, J. M. Jowett, T. P.R. Linnecar, K. H. Mess, J. A. Osborne, L. Rinolfi, D. Schulte, R. Tomas, J. Tuckmantel, F. Zimmermann, A. de Roeck
CERN, Geneva
- S. Chattopadhyay, J. B. Dainton
Cockcroft Institute, Warrington, Cheshire
- A. K. Ciftci
Ankara University, Faculty of Sciences, Tandogan/Ankara
- A. Eide
EPFL, Lausanne
- B. J. Holzer
DESY, Hamburg
- P. Newman
Birmingham University, Birmingham
- E. Perez
CEA, Gif-sur-Yvette
- S. Sultansoy
TOBB ETU, Ankara
- A. Vivoli
LAL, Orsay
- F. J. Willeke
BNL, Upton, New York
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The LHeC collides a lepton beam with one of the intense, LHC, hadron beams. It achieves both e± interactions with quarks at the terascale, at eq masses in excess of 1 TeV, with a luminosity of about 1033 cm-2 s-1, and it also enables a sub-femtoscopic probe of hadronic matter at unprecedented chromodynamic energy density, at Bjorken-x values down to 10-6 in the deep inelastic scattering domain. The LHeC combines the LHC infrastructure with recent advances in radio-frequency, in linear acceleration and in other associated technologies, to enable two proposals for TeV ep collisions: a "ring-ring" option in which 7 TeV protons (and ions) collide with about 70 GeV electrons/positrons in a storage ring in the LHC tunnel and a "linac-ring" option based on an independent superconducting linear accelerator enabling single-pass collisions of electrons and positrons of up to about 140 GeV with an LHC hadron beam. Both options will be presented and compared. Steps are outlined for completing a Conceptual Design Review of the accelerator complex, beam delivery, luminosity, physics and implications for experiment, following declared support by ECFA and by CERN for a CDR.
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Slides
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WEOAG02 |
Measurements of Heavy Ion Beam Losses from Collimation
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1906 |
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- R. Bruce, R. W. Assmann, G. Bellodi, C. Bracco, H.-H. Braun, S. S. Gilardoni, E. B. Holzer, J. M. Jowett, S. Redaelli, Th. Weiler, C. Zamantzas
CERN, Geneva
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The collimation efficiency for Pb82+ ion beams in the LHC is predicted to be much lower than for protons. Nuclear fragmentation and electromagnetic dissociation in the primary collimators create fragments with a wide range of Z/A ratios, which are not intercepted by the secondary collimators but lost where the dispersion has grown sufficiently large. In this article we present measurements of loss patterns caused by a prototype LHC collimator in the CERN SPS. The loss maps show a qualitative difference between Pb82+ ions and protons, with the maximum loss rate observed at different places in the ring. This behaviour was predicted by simulations and provides a valuable benchmark of the simulations done for the LHC.
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Slides
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WEPP052 |
A Storage Ring Based Option for the LHeC
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2638 |
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- F. J. Willeke
BNL, Upton, New York
- F. Bordry, H.-H. Braun, O. S. Brüning, H. Burkhardt, J. M. Jowett, T. P.R. Linnecar, K. H. Mess, S. Myers, J. A. Osborne, F. Zimmermann
CERN, Geneva
- S. Chattopadhyay
Cockcroft Institute, Warrington, Cheshire
- J. B. Dainton, M. Klein
Liverpool University, Science Faculty, Liverpool
- B. J. Holzer
DESY, Hamburg
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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 1033 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.
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WEPP131 |
RF-breakdown Experiments at the CTF3 Two-beam Test-stand
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2800 |
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- M. Johnson, T. J.C. Ekelöf, R. J.M. Y. Ruber, V. G. Ziemann
UU/ISV, Uppsala
- H.-H. Braun
CERN, Geneva
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The Two-beam Test-stand (TBTS) in the CLIC Test Facility CTF3 offers unique possibilities to conduct RF-breakdown related experiments on the accelerating structures and the power extraction and transfer structures with beam. We report on the set-up of two such experiments, one for the measurement of the transverse kick and the other for the measurement of positive ion currents. The purpose of the transverse kick measurements is to determine the effects of a RF-breakdown event on the beam. Five BPMs in the TBTS will be used to study the trajectory of a pulse train after a RF-breakdown event, with important implications for the operation of CLIC. Ion currents ejected from accelerating structures during RF-breakdown events have already been observed at the 30 GHz test stand at the present test facility. Results and their implications for RF-breakdown physics are presented, as well as plans for similar measurements at the TBTS.
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WEPP139 |
The CTF3 Two-beam Test-stand Installation and Experimental Program
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2821 |
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- V. G. Ziemann, T. J.C. Ekelöf, M. Johnson, R. J.M. Y. Ruber
UU/ISV, Uppsala
- H.-H. Braun, S. Doebert, G. Geschonke, G. Riddone, J. P.H. Sladen, I. Syratchev, W. Wuensch
CERN, Geneva
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The Two-beam Test-stand in CTF3 will be used to investigate the power-generation and accelerating structures for the Compact Linear Collider CLIC. We report on its design and construction which was recently completed and discuss the imminent commissioning phase as well as the following experimental program that initially will be devoted to the test of power generation structures in the drive-beam.
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WEPP154 |
Linac-LHC ep Collider Options
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2847 |
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- F. Zimmermann, F. Bordry, H.-H. Braun, O. S. Brüning, H. Burkhardt, R. Garoby, T. P.R. Linnecar, K. H. Mess, J. A. Osborne, L. Rinolfi, D. Schulte, R. Tomas, J. Tuckmantel, A. de Roeck
CERN, Geneva
- H. Aksakal
N. U, Nigde
- S. Chattopadhyay
Cockcroft Institute, Warrington, Cheshire
- A. K. Ciftci
Ankara University, Faculty of Sciences, Tandogan/Ankara
- J. B. Dainton
Liverpool University, Science Faculty, Liverpool
- A. Eide
EPFL, Lausanne
- B. J. Holzer
DESY, Hamburg
- M. Klein
University of Liverpool, Liverpool
- S. Sultansoy
TOBB ETU, Ankara
- A. Vivoli
LAL, Orsay
- F. J. Willeke
BNL, Upton, New York
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We describe various parameter scenarios for a ring-linac ep collider based on LHC and an independent s.c. electron linac. Luminosities of order 1032/cm2/s can be achieved with a standard ILC-like linac, operated either in pulsed or cw mode, with acceptable beam power. Reaching much higher luminosities, up to 1034/cm2/s and beyond, would require the use of two linacs and the implementation of energy recovery. Advantages and challenges of a ring-linac ep collider vis-a-vis an alternative ring-ring collider are discussed.
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THPC017 |
Optimisation of a Beam Transfer FODO Line
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3014 |
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- J. B. Jeanneret, H.-H. Braun
CERN, Geneva
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With in view the design of the CLIC long transfer lines, we developed a formal approach for the optimisation of a straight FODO line. Optimum phase advance and cell length depending on beam parameters are derived for power consumption, overall cost and sensitivity to quadrupole misalignment.
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