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Miller, R.

Paper Title Page
THP87 Accelerator Structure Bead Pull Measurement at SLAC 803
 
  • J. Lewandowski, G. Bowden, J. Wang
    SLAC/ARDA, Menlo Park, California
  • R. Miller
    SLAC, Menlo Park, California
  
  Microwave measurement and tuning of accelerator structures are important issues for the current and next generation of high energy physics machines. Application of these measurements both before and after high power processing can reveal information about the structure but may be misinterpreted if measurement conditions are not carefully controlled. For this reason extensive studies to characterize the microwave measurements at have been made at SLAC. For the beadpull a reproducible measurement of less than 1 degree of phase accuracy in total phase drift is needed in order to resolve issues such as phase changes due to structure damage during high power testing. Factors contributing to measurement errors include temperature drift, mechanical vibration, and limitations of measurement equipment such as the network analyzer. Results of this continuing effort will be presented.  
THP33 Progress toward NLC/GLC Prototype Accelerator Structures 675
 
  • J. Wang, G. Bowden, V.A. Dolgashev, R.M. Jones, J. Lewandowski, C.D. Nantista, S.G. Tantawi
    SLAC/ARDA, Menlo Park, California
  • C. Adolphsen, D.L. Burke, J.Q. Chan, J. Cornuelle, S. Döbert
    SLAC/NLC, Menlo Park, California
  • T. Arkan, C. Boffo, H. Carter, N. Khabiboulline
    FNAL, Batavia, Illinois
  • N. Baboi
    DESY, Hamburg
  • D. Finley, I. Gonin, S. Mishra, G. Romanov, N. Solyak
    Fermilab, Batavia, Illinois
  • Y. Higashi, T. Higo, T. Kumi, Y. Morozumi, N. Toge, K. Ueno
    KEK, Ibaraki
  • Z. Li, R. Miller, C. Pearson, R.D. Ruth, P.B. Wilson, L. Xiao
    SLAC, Menlo Park, California
  
  The accelerator structure groups for NLC (Next Linear Collider) and GLC (Global Linear Colliders) have successfully collaborated on the research and development of a major series of advanced accelerator structures based on room-temperature technology at X-band frequency. The progress in design, simulation, microwave measurement and high gradient tests are summarized in this paper. The recent effort in design and fabrication of the accelerator structure prototype for the main linac is presented in detail including HOM (High Order Mode) suppression and couplers, fundamental mode couplers, optimized accelerator cavities as well as plans for future structures. We emphasize techniques to reduce the field on the surface of the copper structures (in order to achieve high accelerating gradients), limit the dipole wakefields (to relax alignment tolerance and prevent a beam break up instability) and improve shunt impedance (to reduce the RF power required).