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Schulte, D.

Paper Title Page
WEOCC03 Halo Estimates and Simulations for Linear Colliders 2041
 
  • H. Burkhardt, A. Latina, L. Neukermans, D. Schulte
    CERN, Geneva
  • I. V. Agapov, G. A. Blair
    Royal Holloway, University of London, Surrey
  • F. Jackson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
 
  Funding: This work is supported by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.

Halo simulations and estimates are important for the design of future linear accelerators. We present simulations performed for the ILC and CLIC and compare these with semi-analytical estimates and other simulations.

 
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WEPMN071 High RF Power Production for CLIC 2194
 
  • I. Syratchev, E. Adli, D. Schulte, M. Taborelli
    CERN, Geneva
 
  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. The PETS geometry is a result of multiple compromises between beam stability and main linac RF power needs. Another requirement is to provide local RF power termination in case of accelerating structure failure (ON/OFF capability). Surface electric and magnetic fields, power extraction method, HOM damping, ON/OFF capability and fabrication technology were all evaluated to provide a reliable design.  
THPMN010 GUINEA-PIG++ : An Upgraded Version of the Linear Collider Beam-Beam Interaction Simulation Code GUINEA-PIG 2728
 
  • C. Rimbault, P. Bambade, O. Dadoun, G. Le Meur, F. Touze
    LAL, Orsay
  • M. Alabau
    IFIC, Valencia
  • D. Schulte
    CERN, Geneva
 
  GUINEA-PIG++ is a newly developed object-oriented version of the Linear Collider beam-beam simulation program GUINEA-PIG. The main goals of this project are to provide a reliable, modular, documented and versatile framework enabling convenient implementation of new features and functionalities. Examples of improvements described in this paper are an easy interface to study the impact of electromagnetic effects on Bhabha event selections, a treatment of spin depolarization effects, automatic consistency checks and adjustments of internal computational parameters, upgraded input/output and user interface, an optimised setup for massive production on distributed computing GRIDs. A possible setup to perform fast parallelised computations is also discussed.  
THPMN056 Comparison of ILC Fast Beam-Beam Feedback Performance in the e-e- and e+e- Modes of Operation 2832
 
  • M. Alabau, A. Faus-Golfe
    IFIC, Valencia
  • P. Bambade
    LAL, Orsay
  • A. Latina, D. Schulte
    CERN, Geneva
 
  Several feedback loops are required in the Beam Delivery System (BDS) of the International Linear Collider (ILC) to preserve the luminosity in the presence of dynamic imperfections. Realistic simulations have been carried out to study the performance of the beam-beam deflection based fast feedback system, for both e+e- and e-e- modes of operation. The beam-beam effects in the e-e- collisions make both the luminosity and the deflections more sensitive to offsets at the IP than in the case of the e+e- collisions. This reduces the performance of the feedback system in comparison to the standard e+e- collisions, and may require a different beam parameter optimization.  
THPMN059 Feedback Studies 2841
 
  • A. Latina, G. Rumolo, D. Schulte, R. Tomas
    CERN, Geneva
 
  Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area".

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. We also address the impact of ground motion in the beam delivery system and the potential cures.

 
THPMN061 Bunch Compressor for Beam-Based Alignment 2844
 
  • A. Latina, D. Schulte
    CERN, Geneva
  • P. Eliasson
    Uppsala University, Uppsala
 
  Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area".

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. We study how to use the Bunch Compressor to create the off-energy beams necessary for DFS and discuss the effectiveness of this method.

 
THPMN062 Dynamic Effects During Beam-Based Alignment 2847
 
  • D. Schulte, P. Eliasson, A. Latina
    CERN, Geneva
 
  Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area".

Complex beam-based alignment procedures are needed in future linear colliders to reduce the negative effects of static imperfections in the main linac on the beam emittance. The efficiency of these procedures could be affected by dynamic imperfections during their application. In this paper we study the resulting emittance growth.

 
THPMN064 Luminosity Upgrade of CLIC-LHC ep/gp Collider 2853
 
  • H. Aksakal, A. K. Ciftci, Z. Nergiz
    Ankara University, Faculty of Sciences, Tandogan/Ankara
  • D. Schulte, F. Zimmermann
    CERN, Geneva
 
  An energy-frontier or QCD-exploring ep and gp collider can be realized by colliding high-energy photons generated by Compton back-scattered off a CLIC electron beam, at either 75 GeV or 1.5 TeV, with protons or ions stored in the LHC. In this study we discuss a performance optimization of this type of collider by tailoring the parameters of both CLIC and LHC. An estimate of the ultimately achievable luminosity is given.  
THPMN073 Collimation Optimisation in the Beam Delivery System of the International Linear Collider 2871
 
  • F. Jackson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. J. Barlow, A. M. Toader
    UMAN, Manchester
  • A. Latina, D. Schulte
    CERN, Geneva
 
  The collimation systems of the International Linear Collider (ILC) Beam Delivery System (BDS) must perform efficient removal of halo particles which lie outside the acceptable ranges of energy and spatial spread. An optimisation strategy based on earlier work is applied to the latest version of the BDS lattice. The resulting improvement in collimation performance is studied by halo tracking simulations, and the luminosity performance of the optimised lattice is also examined.  
THPMS013 Comparison of Tracking Codes for the International Linear Collider 3020
 
  • J. C. Smith
    CLASSE, Ithaca
  • P. Eliasson
    Uppsala University, Uppsala
  • K. Kubo
    KEK, Ibaraki
  • A. Latina, D. Schulte
    CERN, Geneva
  • P. Lebrun, K. Ranjan
    Fermilab, Batavia, Illinois
  • F. Poirier, N. J. Walker
    DESY, Hamburg
  • P. Tenenbaum
    SLAC, Menlo Park, California
 
  Funding: Supported by the US Department of Energy, the US National Science Foundation and the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area".

In an effort to compare beam dynamics and create a ‘‘benchmark'' for Dispersion Free Steering (DFS) a comparison was made between different International Linear Collider (ILC) simulation programs while performing DFS. This study consisted of three parts. First, a simple betatron oscillation was tracked through each code. Secondly, a set of component misalignments and corrector settings generated from one program was read into the other to confirm similar emittance dilution. Thirdly, given the same set of component misalignments DFS was performed independently in each program and the resulting emittance dilution was compared. Performance was found to agree exceptionally well in all three studies.

 
WEOCAB01 Design of the Beam Delivery System for the International Linear Collider 1985
 
  • A. Seryi, J. A. Amann, R. Arnold, F. Asiri, K. L.F. Bane, P. Bellomo, E. Doyle, A. F. Fasso, L. Keller, J. Kim, K. Ko, Z. Li, T. W. Markiewicz, T. V.M. Maruyama, K. C. Moffeit, S. Molloy, Y. Nosochkov, N. Phinney, T. O. Raubenheimer, S. Seletskiy, S. Smith, C. M. Spencer, P. Tenenbaum, D. R. Walz, G. R. White, M. Woodley, M. Woods, L. Xiao
    SLAC, Menlo Park, California
  • I. V. Agapov, G. A. Blair, S. T. Boogert, J. Carter
    Royal Holloway, University of London, Surrey
  • M. Alabau, P. Bambade, J. Brossard, O. Dadoun
    LAL, Orsay
  • M. Anerella, A. K. Jain, A. Marone, B. Parker
    BNL, Upton, Long Island, New York
  • D. A.-K. Angal-Kalinin, C. D. Beard, J.-L. Fernandez-Hernando, P. Goudket, F. Jackson, J. K. Jones, A. Kalinin, P. A. McIntosh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Appleby
    UMAN, Manchester
  • J. L. Baldy, D. Schulte
    CERN, Geneva
  • L. Bellantoni, A. I. Drozhdin, V. S. Kashikhin, V. Kuchler, T. Lackowski, N. V. Mokhov, N. Nakao, T. Peterson, M. C. Ross, S. I. Striganov, J. C. Tompkins, M. Wendt, X. Yang
    Fermilab, Batavia, Illinois
  • K. Buesser
    DESY, Hamburg
  • P. Burrows, G. B. Christian, C. I. Clarke, A. F. Hartin
    OXFORDphysics, Oxford, Oxon
  • G. Burt, A. C. Dexter
    Cockcroft Institute, Warrington, Cheshire
  • J. Carwardine, C. W. Saunders
    ANL, Argonne, Illinois
  • B. Constance, H. Dabiri Khah, C. Perry, C. Swinson
    JAI, Oxford
  • O. Delferriere, O. Napoly, J. Payet, D. Uriot
    CEA, Gif-sur-Yvette
  • C. J. Densham, R. J.S. Greenhalgh
    STFC/RAL, Chilton, Didcot, Oxon
  • A. Enomoto, S. Kuroda, T. Okugi, T. Sanami, Y. Suetsugu, T. Tauchi
    KEK, Ibaraki
  • A. Ferrari
    UU/ISV, Uppsala
  • J. Gronberg
    LLNL, Livermore, California
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  • W. Lohmann
    DESY Zeuthen, Zeuthen
  • L. Ma
    STFC/DL, Daresbury, Warrington, Cheshire
  • T. M. Mattison
    UBC, Vancouver, B. C.
  • T. S. Sanuki
    University of Tokyo, Tokyo
  • V. I. Telnov
    BINP SB RAS, Novosibirsk
  • E. T. Torrence
    University of Oregon, Eugene, Oregon
  • D. Warner
    Colorado University at Boulder, Boulder, Colorado
  • N. K. Watson
    Birmingham University, Birmingham
  • H. Y. Yamamoto
    Tohoku University, Sendai
 
  The beam delivery system for the linear collider focuses beams to nanometer sizes at the interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the physics goals. The beam delivery system of the International Linear Collider has undergone several configuration changes recently. This paper describes the design details and status of the baseline configuration considered for the reference design.  
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THPAN066 Improvements in FAKTOR2, a Code to Simulate Collective Effect of Electrons and Ions 3375
 
  • W. Bruns, D. Schulte, F. Zimmermann
    CERN, Geneva
 
  Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area".

The electrostatic Particle in Cell code 'Faktor2' is extended to 3D, and is parallelised. Results for electron cloud buildup in end regions of damping ring dipoles for next generation linear colliders are presented.

 
THPAN068 Wakefield Models for Particle Tracking Codes 3378
 
  • A. Latina, G. Rumolo, D. Schulte
    CERN, Geneva
  • R. J. Barlow, A. Bungau
    UMAN, Manchester
  • G. A. Blair
    Royal Holloway, University of London, Surrey
  • J. D.A. Smith
    Lancaster University, Lancaster
 
  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. They should thus be extended with either analytical models or export the wakefields numerically evaluated with other codes (such as Gdfidl) when analytical models are not feasible. We discuss both approaches and present their implementation in PLACET, MERLIN and BDSIM. The simulation results for the ILC and CLIC beam delivery systems are given as an example. Results produced with different codes are compared.  
THPAN075 Modeling Incoherent Electron Cloud Effects 3393
 
  • F. Zimmermann, E. Benedetto, G. Rumolo, D. Schulte, R. Tomas
    CERN, Geneva
  • W. Fischer
    BNL, Upton, Long Island, New York
  • G. Franchetti
    GSI, Darmstadt
  • K. Ohmi
    KEK, Ibaraki
  • M. T.F. Pivi, T. O. Raubenheimer
    SLAC, Menlo Park, California
  • K. G. Sonnad, J.-L. Vay
    LBNL, Berkeley, California
 
  Incoherent effects driven by an electron cloud could seriously limit the beam lifetime in proton storage rings or blow up the vertical emittance in positron ones. Different approaches to modeling these effects each have their own merits and drawbacks. We compare the simulation results and computing time requirements from a number of dedicated codes under development over the last years, and describe the respective approximations for the beam-electron cloud interaction, the accelerator structure, and the optical lattice, made in each of these codes. Examples considered include the LHC, CERN SPS, RHIC, and the ILC damping ring. Tentative conclusions are drawn and a strategy for further codes development is outlined.  
FRPMN012 Bias on Absolute Luminosity Measurements at the ILC from Beam-Beam Space Charge Effects 3907
 
  • C. Rimbault, P. Bambade
    LAL, Orsay
  • K. Moenig
    DESY Zeuthen, Zeuthen
  • D. Schulte
    CERN, Geneva
 
  A way to determine luminosity at the International Linear Collider (ILC) is to measure the Bhabha event rate in a finely segmented calorimeter (LumiCal) at very low polar angles in the very forward region of the detector. An absolute precision between 10-4 and 10-3 is needed for a number of key physics measurements. Besides theoretical uncertainties on the Bhabha cross section and experimental errors when identifying Bhabha events in the LumiCal, the very strong beam-beam space charge effects which characterise the ILC e+e- collisions lead to a major bias in the counting rate, which drastically limits the luminosity measurement if uncorrected. In this paper, Bhabha event samples produced with the BHLUMI generator are used in the context of the GUINEA-PIG beam-beam simulation to study how beamstrahlung radiation and electromagnetic deflections affect the proposed experimental selections. A corrective method based on determining the luminosity spectrum within the LumiCal is suggested to minimise the resulting errors. The expected residual uncertainty after correction is estimated based on simulations with realistic beam conditions.