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The FLASH L-band (1.3 GHz) superconducting accelerator facility at DESY has aLow Level RF (LLRF) system that is similar to that envisioned for ILC. Thissystem has extensive monitoring capability and was used to gather performancedata relevant to ILC. Recently, waveform data were recorded with both beam onand off for three, 8-cavity cryomodules to evaluate the input RF and cavitygradient stability and study the rf overhead required to achieve constantgradient during the 800\mu\s pulses. In this paper, we present the recentexperimental results and discuss the pulse-to-pulse input rf and cavitygradient stability for both the beam on and off cases. In addition, a model ofthe gradient variation observed in the beam off case will be described.

Latest Results on Cavity Gradient and Input RF Stability at FLASH/TTF Facility