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001     224042
005     20211110131611.0
037 _ _ |a PUBDB-2015-03408
041 _ _ |a English
100 1 _ |a Kruppa, K.
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111 2 _ |a 5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications
|g SIMULTECH 2015
|c Colmar
|d 2015-07-21 - 2015-07-23
|w France
245 _ _ |a High Precision Temperature Control of Normal-Conducting RF GUN for a High Duty Cycle Free-Electron Laser
260 _ _ |c 2015
336 7 _ |a conferenceObject
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336 7 _ |a Conference Paper
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336 7 _ |a Conference Presentation
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336 7 _ |a INPROCEEDINGS
|2 BibTeX
500 _ _ |a data released under the ODC-BY 1.0 license
520 _ _ |a 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.
536 _ _ |a 631 - Accelerator R & D (POF3-631)
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693 _ _ |a XFEL
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700 1 _ |a Pfeiffer, Sven
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700 1 _ |a Lichtenberg, G.
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700 1 _ |a Brinker, Frank
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700 1 _ |a Decking, Winfried
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700 1 _ |a Floettmann, Klaus
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700 1 _ |a Krebs, Olaf
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700 1 _ |a Schlarb, Holger
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700 1 _ |a Schreiber, Siegfried
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913 1 _ |a DE-HGF
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