%0 Conference Paper
%A Kruppa, K.
%A Pfeiffer, Sven
%A Lichtenberg, G.
%A Brinker, Frank
%A Decking, Winfried
%A Floettmann, Klaus
%A Krebs, Olaf
%A Schlarb, Holger
%A Schreiber, Siegfried
%T High Precision Temperature Control of Normal-Conducting RF GUN for a High Duty Cycle Free-Electron Laser
%M PUBDB-2015-03408
%D 2015
%Z data released under the ODC-BY 1.0 license
%X High precision temperature control of the RF GUN is necessary to optimally accelerate thousands of electrons within the injection part of the European X-ray free-electron laser XFEL and the Free Electron Laser FLASH. A difference of the RF GUN temperature from the reference value of only 0.01 K leads to detuning of the cavity and thus limits the performance of the whole facility. Especially in steady-state operation there are some undesired temperature oscillations when using classical standard control techniques like PID control. That is why a model based approach is applied here to design the RF GUN temperature controller for the free-electron lasers. A thermal model of the RF GUN and the cooling facility is derived based on heat balances, considering the heat dissipation of the Low-Level RF power. This results in a nonlinear model of the plant. The parameters are identified by fitting the model to data of temperature, pressure and control signal measurements of the FLASH facility, a pilot test facility for the European XFEL. The derived model is used for controller design. A linear model predictive controller was implemented in MATLAB/Simulink and tuned to stabilize the temperature of the RF GUN in steady-state operation. A test of the controller in simulation shows promising results.
%B 5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications
%C 21 Jul 2015 - 23 Jul 2015, Colmar (France)
Y2 21 Jul 2015 - 23 Jul 2015
M2 Colmar, France
%F PUB:(DE-HGF)6
%9 Conference Presentation
%U https://bib-pubdb1.desy.de/record/224042