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Authors: Kai Kruppa 1 ; Sven Pfeiffer 2 ; Gerwald Lichtenberg 1 ; Frank Brinker 2 ; Winfried Decking 2 ; Klaus Flöttmann 2 ; Olaf Krebs 2 ; Holger Schlarb 2 and Siegfried Schreiber 2

Affiliations: 1 Hamburg University of Applied Sciences, Germany ; 2 DESY, Germany

ISBN: 978-989-758-120-5

Keyword(s): Nonlinear Systems, Thermal Modelling, Predictive Control, RF Cavities.

Related Ontology Subjects/Areas/Topics: Case Studies ; Dynamical Systems Models and Methods ; Formal Methods ; Health Engineering and Technology Applications ; Neural Rehabilitation ; Neurotechnology, Electronics and Informatics ; Performance Analysis ; Simulation and Modeling ; Simulation Tools and Platforms

Abstract: 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. (More)

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Paper citation in several formats:
Kruppa, K.; Pfeiffer, S.; Lichtenberg, G.; Brinker, F.; Decking, W.; Flöttmann, K.; Krebs, O.; Schlarb, H. and Schreiber, S. (2015). High Precision Temperature Control of Normal-conducting RF GUN for a High Duty Cycle Free-Electron Laser.In Proceedings of the 5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH, ISBN 978-989-758-120-5, pages 307-317. DOI: 10.5220/0005567503070317

@conference{simultech15,
author={Kai Kruppa. and Sven Pfeiffer. and Gerwald Lichtenberg. and Frank Brinker. and Winfried Decking. and Klaus Flöttmann. and Olaf Krebs. and Holger Schlarb. and Siegfried Schreiber.},
title={High Precision Temperature Control of Normal-conducting RF GUN for a High Duty Cycle Free-Electron Laser},
booktitle={Proceedings of the 5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,},
year={2015},
pages={307-317},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005567503070317},
isbn={978-989-758-120-5},
}

TY - CONF

JO - Proceedings of the 5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,
TI - High Precision Temperature Control of Normal-conducting RF GUN for a High Duty Cycle Free-Electron Laser
SN - 978-989-758-120-5
AU - Kruppa, K.
AU - Pfeiffer, S.
AU - Lichtenberg, G.
AU - Brinker, F.
AU - Decking, W.
AU - Flöttmann, K.
AU - Krebs, O.
AU - Schlarb, H.
AU - Schreiber, S.
PY - 2015
SP - 307
EP - 317
DO - 10.5220/0005567503070317

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