Author: Weathersby, S.P.
Paper Title Page
TUPP124
 Update on High Power Tests of Single Cell Standing Wave structures at SLAC  
 
  • V.A. Dolgashev, J.R. Lewandowski, S.G. Tantawi, S.P. Weathersby, A.D. Yeremian
    SLAC, Menlo Park, California, USA
  • Y. Higashi
    OIST, Onna-son, Okinawa, Japan
  • B. Spataro
    INFN/LNF, Frascati (Roma), Italy
  
  Funding: This work was supported by the U.S. Department of Energy contract DE-AC02-76SF00515.
We report results of ongoing high power tests of single cell standing wave structures. These tests are part of an experimental and theoretical study of rf breakdown in normal conducting structures at 11.4 GHz. The goal of this study is to determine the accelerating gradient capability of normal-conducting rf powered particle accelerators. The test setup consists of reusable mode-launchers and short test structures powered by SLAC's XL-4 klystron. We have tested structures of different geometries, cell joining techniques, and materials, including copper structures with molybdenum and stainless steel irises. In previous experiments we found that the breakdown rate is correlated more with peak surface pulse heating than with the peak surface electric field. In recent experiments we continue study of hard cooper alloys and manufacturing techniques that avoid heat treatment of the metal. As a result we observed that cooper silver alloys show superior performance in comparison with both hard and heat treated copper.