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Carwardine, J.

Paper Title Page
TUPEA059 Latest Results on Cavity Gradient and Input RF Stability at FLASH/TTF Facility 1470
 
  • S. Pei, C. Adolphsen
    SLAC, Menlo Park, California
  • J. Carwardine
    ANL, Argonne
  • N.J. Walker
    DESY, Hamburg
 
 

The FLASH L-band (1.3 GHz) superconducting accelerator facility at DESY has a Low Level RF (LLRF) system that is similar to that envisioned for ILC. This system has extensive monitoring capability and was used to gather performance data relevant to ILC. Recently, waveform data were recorded with both beam on and off for three, 8-cavity cryomodules to evaluate the input RF and cavity gradient stability and study the RF overhead required to achieve constant gradient during the 800μs pulses. In this paper, we present the recent experimental results and discuss the pulse-to-pulse input RF and cavity gradient stability for both beams on and off cases. In addition, a model of the gradient variation observed in the beam off case will be described.