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Proceedings Paper

The RF control system for the DESY X-FEL
Author(s): Stefan Simrock
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Paper 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.

Paper Details

Date Published: 22 July 2004
PDF: 14 pages
Proc. SPIE 5484, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II, (22 July 2004); doi: 10.1117/12.568849
Show Author Affiliations
Stefan Simrock, Deutsches Elektronen-Synchrotron (Germany)


Published in SPIE Proceedings Vol. 5484:
Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II

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