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Wuensch, W.

Paper Title Page
WEPE032 Recent Progress on a Manifold Damped and Detuned Structure for CLIC 3425
 
  • V.F. Khan, A. D'Elia, R.M. Jones
    UMAN, Manchester
  • A. Grudiev, W. Wuensch, R. Zennaro
    CERN, Geneva
  
 

Our earlier design* for an accelerating structure to suppress the wakefields in the CLIC main accelerating cavities has been modified. This structure combines strong detuning of the cell frequencies with waveguide-like damping by providing the structure with four attached manifolds which loosely couple a portion of the wakefields from each cell. The amended geometry reduces the surface pulse temperature heating by approximately 20%. We report on the overall parameters of the fundamental mode, together with details on damping higher order dipole modes. In order to adequately suppress the wakefield we interleave the frequencies of eight successive structures.


* Khan and Jones, TU5PFP007, PAC'09, Vancouver, Canada 2009.

  
WEPE022 CLIC Energy Scans 3395
 
  • D. Schulte, R. Corsini, B. Dalena, J.-P. Delahaye, S. Döbert, G. Geschonke, A. Grudiev, J.B. Jeanneret, E. Jensen, P. Lebrun, Y. Papaphilippou, L. Rinolfi, G. Rumolo, H. Schmickler, F. Stulle, I. Syratchev, R. Tomás, W. Wuensch
    CERN, Geneva
  • E. Adli
    University of Oslo, Oslo
  
 

The physics experiments at CLIC will require that the machine scans lower than nominal centre-of-mass energy. We present different options to achieve this and discuss the implications for luminosity and the machine design.

  
THPEA013 Advances in X-band TW Accelerator Structures Operating in the 100 MV/m Regime 3702
 
  • T. Higo, Y. Higashi, S. Matsumoto, K. Yokoyama
    KEK, Ibaraki
  • C. Adolphsen, V.A. Dolgashev, A. Jensen, L. Laurent, S.G. Tantawi, F. Wang, J.W. Wang
    SLAC, Menlo Park, California
  • S. Döbert, A. Grudiev, G. Riddone, W. Wuensch, R. Zennaro
    CERN, Geneva
  
 

A CERN-SLAC-KEK collaboration on high gradient X-band accelerator structure development for CLIC has been ongoing for three years. The major outcome has been the demonstration of stable 100 MV/m gradient operation of a number of CLIC prototype structures. These structures were fabricated basically using the technology developed from 1994 to 2004 for the GLC/NLC linear collider initiative. One goal has been to refine the essential parameters and fabrication procedures needed to realize such high gradient routinely. Another goal has been to develop structures with stronger dipole mode damping than those for GLC/NLC. The latter requires that surface temperature rise during the pulses be higher, which may increase the breakdown rate. Structures with heavy damping will be tested in late 2009/early 2010, and this paper will present these results together with some of the earlier results from non-damped structures and structures built with a quadrant geometry.