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000224042 041__ $$aEnglish
000224042 1001_ $$0P:(DE-HGF)0$$aKruppa, K.$$b0
000224042 1112_ $$a5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications$$cColmar$$d2015-07-21 - 2015-07-23$$gSIMULTECH 2015$$wFrance
000224042 245__ $$aHigh Precision Temperature Control of Normal-Conducting RF GUN for a High Duty Cycle Free-Electron Laser
000224042 260__ $$c2015
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000224042 520__ $$aHigh 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.
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000224042 693__ $$0EXP:(DE-H253)XFEL(machine)-20150101$$1EXP:(DE-H253)XFEL-20150101$$5EXP:(DE-H253)XFEL(machine)-20150101$$aXFEL$$eFacility (machine) XFEL$$x0
000224042 7001_ $$0P:(DE-H253)PIP1012349$$aPfeiffer, Sven$$b1$$eCorresponding author
000224042 7001_ $$0P:(DE-HGF)0$$aLichtenberg, G.$$b2
000224042 7001_ $$0P:(DE-H253)PIP1002841$$aBrinker, Frank$$b3$$udesy
000224042 7001_ $$0P:(DE-H253)PIP1002733$$aDecking, Winfried$$b4
000224042 7001_ $$0P:(DE-H253)PIP1002625$$aFloettmann, Klaus$$b5
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000224042 7001_ $$0P:(DE-H253)PIP1000212$$aSchlarb, Holger$$b7
000224042 7001_ $$0P:(DE-H253)PIP1001613$$aSchreiber, Siegfried$$b8
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