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• W2275863443 abstract "The European XFEL is being constructed at the Deutsche Elektronen Synchrotron DESY to generate intense, ultrashort pulses of highly coherent and monochromatic X-Rays for material science research. X-ray flashes are generated by accelerating electron bunches within superconducting cavities with radio frequency (RF) fields to energies up to 17.5 GeV. The digital control of these fields requires extremely high quality in order to achieve the physical processes of photon generation. DESY offers with FLASH a pilot test facility, allowing to test and develop most necessary components, even before the XFEL is conducted. Current field control is based on a proportional feedback controller in addition to a constant feedforward drive, which do not meet the high requirements of the XFEL.This thesis shows that a model based controller design can achieve the necessary field regulation requirements. A linear, time invariant ”black box model” is estimated, which characterizes the essential dynamic behavior. This model is not based on physical assumptions, but describes exclusively the transfer behavior of the plant. The acceleration modules are operated in a pulsed mode, in which the RF field must be kept constant for a finite period. The character of the disturbances and variations from pulse-to-pulse, together with the properties of the system, require a combination of controlled feedforward drive and feedback. Generally unpredictable, low frequency pulse-to-pulse variations are suppressed by the feedback controller. The structural design of the complex multivariable feedback controller is given, which constrains the model based design approach to assign the controller parameters only. Estimation of the parameters, which can not be tuned manually, is done by the method of H¥ loop shaping which is often applied in modern control theory. However, disturbances within a pulse are in a high frequency range concerning the short pulse duration. They are not sufficiently suppressed by the feedback controller alone, due to the small bandwidth of the system. These are mainly repetitive effects like the beam induced field transient decay. Iterative learning control techniques allow adaptation of the feedforward drive such that repetitive disturbances are compensated. The combination of both controllers and the achieved limits of regulation represent the central results of this work. The results presented are from measurements done at FLASH that demonstrate the possibility of permanent implementation of these controllers for the accelerator operation as well as for later application at XFEL. To show the flexibility and advantages of the model based controller design, additional measurement results are given from other accelerator systems. Considerations for integrating beam based information show that this work forms the basis for optimal field control." @default.
• W2275863443 created "2016-06-24" @default.
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• W2275863443 date "2011-07-08" @default.
• W2275863443 modified "2023-09-23" @default.
• W2275863443 title "RF system modeling and controller design for the European XFEL" @default.
• W2275863443 hasPublicationYear "2011" @default.
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