MC7: Accelerator Technology
T13 Cryogenics
Paper Title Page
THVIR10
Cryogenic-Copper Accelerating Structures: New Frontier for Beam Brightness, Efficiency and Cost-Capability  
 
  • M.H. Nasr, M. Breidenbach, E.A. Nanni, S.G. Tantawi
    SLAC, Menlo Park, California, USA
 
  The operation of normal conducting (NC) linacs at cryogenic temperatures creates new frontiers of ultra-high gradient performance of accelerator structure. Reducing the operating temperature of NC linacs to cryogenic-temperature decreases the surface resistance compared to room-temperature operation. This results in large increase in the shunt impedance and the intrinsic quality factor of the cavity, which enables higher gradient operation as well as increased beam loading capabilities. Moreover, low temperature operation increases surface hardness and results in large reduction in breakdown rates compared to room-temperature operation. We are experimentally investigating the operation of an X-band, 20 cells, standing wave, linac at LN temperature of 77k. This structure was previously processed and tested at room-temperature for reference. Operating with LN results in much reduced cost compared to the complicated setup required for operation with LHe, and still provides much enhanced characteristics of NC accelerator structures. In this paper, we will present the experimental setup and initial measurement results of our NC linac testing at cryogenic-temperature at SLAC.  
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