klystron

Paper	Title	Other Keywords	Page
WEPL014	Consolidating the FLASH LLRF System Using DOOCS Standard Server and the FLASH DAQ	controls, gun, monitoring, feedback	55
	O. Hensler, V. Ayvazyan, Z. Geng, W. Koprek, H. Schlarb, Ch. Schmidt DESY, Hamburg
	Over the last years the LLRF group developed many different flavors of hardware to control the RF systems at the Free Electron Laser in Hamburg (FLASH). This led to a variety of firmware version as well as control system server and display panels. A joined attempt of the LLRF and the controls group was made over the last year to consolidate hardware, improve the firmware and develop one DOOCS front-end server for all 6 RF stations. Furthermore, DOOCS standard server are used for automation, like simple state machines, and the FLASH DAQ for bunch-to-bunch monitoring tasks, e.g. quench-detection. An outlook of new developments for the upcoming European XFEL, using xTCA technologies, will be given.
	Poster
THPL012	LLRF Control System Upgrade at FLASH	controls, feedback, laser, radiation	150
	V. Ayvazyan, Z. Geng, M. K. Grecki, O. Hensler, M. G. Hoffmann, M. Hoffmann, T. Jezynski, W. Koprek, F. Ludwig, K. Rehlich, H. Schlarb, Ch. Schmidt, S. Simrock, H. C. Weddig DESY, Hamburg K. Czuba Warsaw University of Technology, Institute of Electronic Systems, Warsaw
	The Free Electron Laser in Hamburg (FLASH) is a user facility providing high brilliant laser light for experiments. It is also a unique facility for testing the superconducting accelerator technology for the European XFEL and the International Linear Collider. As a test facility, the accelerator undergoes a constant modification and expansion. The recent upgrade started in autumn 2009. The beam energy is increased to 1.2 GeV by installing a 7th superconducting accelerating module. The new module is a prototype for the European XFEL. In order to increase the FEL radiation intensity by linearization of the beam phase space the 3rd harmonic superconducting RF cavities are installed in the injector. LLRF control system has been completely upgraded to latest generation controller boards, down-converters for higher intermediate frequency, algorithms improved like beam loading compensation, feed-forward waveform generation, etc. In order to improve the reference frequency signals the master oscillator and frequency distribution system has been upgraded as well. The paper summarizes the recently finished LLRF system upgrade and expected RF field control performance at FLASH.
	Poster