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linear-collider

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MO302 S1-Global Collaborative Efforts - 8-Cavity-Cryomodule: 2 FNAL, 2 DESY and 4 KEK cavity, cryomodule, vacuum, linac 31
 
  • N. Ohuchi, M. Akemoto, S. Fukuda, H. Hayano, N. Higashi, E. Kako, H. Katagiri, Y. Kojima, Y. Kondou, T. Matsumoto, H. Matsushita, S. Michizono, T. Miura, H. Nakai, H. Nakajima, S. Noguchi, M. Satoh, T. Shidara, T. Shishido, T. Takenaka, A. Terashima, N. Toge, K. Tsuchiya, K. Watanabe, S. Yamaguchi, A. Yamamoto, Y. Yamamoto, K. Yokoya, M. Yoshida
    KEK, Ibaraki
  • C. Adolphsen, C.D. Nantista
    SLAC, Menlo Park, California
  • T.T. Arkan, S. Barbanotti, H. Carter, M.S. Champion, R.D. Kephart, J.S. Kerby, D.V. Mitchell, Y. Orlov, T.J. Peterson, M.C. Ross
    Fermilab, Batavia
  • A. Bosotti, C. Pagani, R. Paparella, P. Pierini
    INFN/LASA, Segrate (MI)
  • D. Kostin, L. Lilje, A. Matheisen, W.-D. Möller, N.J. Walker, H. Weise
    DESY, Hamburg
 
 

In an attempt at demonstrating an average field gradient of 31.5 MV/m as per the design accelerating gradient for ILC, a program called S1-Global is in progress as an international research collaboration among KEK, INFN, FNAL, DESY and SLAC. The design of the S1-G cryomodule began at May 2008 by INFN and KEK. The S1-Global cryomodule was designed to contain eight superconducting cavities from FNAL, DESY and KEK, and to be constructed by joining two half-size cryomodules, each 6 m in length. The module containing four cavities from FNAL and DESY was constructed by INFN. Four KEK cavities have been assembled in the 6 m module which KEK fabricated. All major components were transported to KEK from INFN, FNAL and DESY in December 2009. The assembly of the two 6-m cryomodules started from January 2010 in a collaborative work of FNAL, DESY, INFN and KEK. The construction of the S1-G cryomodule will complete in May, and the cool-down of the S1-G cryomodule is scheduled from June 2010 at the KEK-STF. In this paper, the construction and the cold tests of the S1-Global cryomodule in the worldwide research collaboration will be presented.

 

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MOP025 ACE3P Computations of Wakefield Coupling in the CLIC Two-beam Accelerator wakefield, simulation, coupling, damping 106
 
  • A.E. Candel, K. Ko, Z. Li, C.-K. Ng, V. Rawat, G.L. Schussman
    SLAC, Menlo Park, California
  • A. Grudiev, I. Syratchev, W. Wuensch
    CERN, Geneva
 
 

The Compact Linear Collider (CLIC) provides a path to a multi-TeV accelerator to explore the energy frontier of High Energy Physics. Its novel two-beam accelerator concept envisions rf power transfer to the accelerating structures from a separate high-current decelerator beam line consisting of power extraction and transfer structures (PETS). It is critical to numerically verify the fundamental and higher-order mode properties in and between the two beam lines with high accuracy and confidence. To solve these large-scale problems, SLAC's parallel finite element electromagnetic code suite ACE3P is employed. Using curvilinear conformal meshes and higher-order finite element vector basis functions, unprecedented accuracy and computational efficiency are achieved, enabling high-fidelity modeling of complex detuned structures such as the CLIC TD24 accelerating structure. In this paper, time-domain simulations of wakefield coupling effects in the combined system of PETS and the TD24 structures are presented. The results will help to identify potential issues and provide new insights on the design, leading to further improvements on the novel CLIC two-beam accelerator scheme.

 
MOP026 A Novel Alignment Procedure for the Final Focus of Future Linear Colliders alignment, coupling, multipole, collider 109
 
  • A. Latina
    Fermilab, Batavia
  • P. Raimondi
    INFN/LNF, Frascati (Roma)
 
 

An algorithm for the simultaneous optimization of orbit, dispersion, coupling and beta-beating in the final focus of future linear colliders is presented. Based on orbit and dispersion measurements the algorithm determines the optimal corrector settings in order to simultaneously minimize the r.m.s orbit, the r.m.s dispersion, the r.m.s coupling, the r.m.s. beta-beating and the r.m.s strength of the dipoles correctors. A number of different options for error handling of beam position monitors, weighting, and correction have been introduced to ensure the stability of the algorithm. A sextupole tuning procedure is also applied to further optimize the beam parameters at the interaction point. Preliminary results for the beam delivery systems of CLIC are presented.

 
MOP075 Breakdown Characteristics in DC Spark Experiments of Copper Focusing on Purity and Hardness vacuum, cathode, collider, focusing 229
 
  • K. Yokoyama, S. Fukuda, Y. Higashi, T. Higo, S. Matsumoto
    KEK, Ibaraki
  • S. Calatroni, R. Santiago Kern, W. Wuensch
    CERN, Geneva
  • C. Pasquino
    Politecnico/Milano, Milano
 
 

To investigate the breakdown characteristic related to the differences in purity and hardness, four types of oxygen-free copper (OFC) materials, usual class 1 OFC with/without diamond finish, 7-nine large-grain copper and 6-nine hot-isotropic-pressed copper, were tested with the DC spark test system at CERN. Measurements of beta, breakdown fields and breakdown probability are discussed followed by the surface inspection mostly with SEM on the tested materials.

 
FR104 Progress of X-Band Accelerating Structures collider, damping, vacuum, linac 1038
 
  • T. Higo
    KEK, Ibaraki
 
 

A CERN-SLAC-KEK collaboration on high gradient X-band accelerator structure development for CLIC has been ongoing for the past three years. A major outcome has been the stable 100 MV/m gradient operation of a number of CLIC prototype structures. The design of the structures, which have very strong higher-order-mode damping, is based on newly developed high-power scaling laws. The structures are being fabricated using the technology which was developed in the GLC/NLC projects which is giving excellent reproducibility. The features of this new generation of high-gradient normal conducting structures and their testing results are reviewed.

 

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