The RF control system for the DESY X-FEL

Stefan Simrock

doi:10.1117/12.568849

22 July 2004 The RF control system for the DESY X-FEL

Stefan Simrock

Proceedings Volume 5484, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II; (2004) https://doi.org/10.1117/12.568849
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II, 2003, Wilga, Poland

Abstract

The technology of superconducting cavities has developed rapidly during the past decade and gradients of 25 MV/m at an unloaded Q of 1e10 can be guaranteed for a large scale production as required for the X-FEL with its 1000 cavities. The rf control of the cavity fields to the level of 10e-4 for amplitude and 0.1 deg. for phase however presents a significant technical challenge due the narrow bandwidth of the cavities which results in a high sensitivity to perturbations of the resonance frequency by mechanical vibrations (microphonics) and Lorentz force detuning. A digital rf control system has been developed for the UV-FEL presently under construction at DESY which will demonstrate the required control performance while providing flexibility in the control algorithms, precise calibration of the vector-sum, and extensive diagnostics and exception handling capabilities. A piezotranslator based active compensation scheme for the time varying Lorentz force detuning will reduce significantly reduce the rf power required for control.

Citation Download Citation

Stefan Simrock "The RF control system for the DESY X-FEL", Proc. SPIE 5484, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II, (22 July 2004); https://doi.org/10.1117/12.568849

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