Intra-Bunch-Train Transverse Dynamics in the Superconducting Accelerators FLASH and European XFEL

Hellert, Thorsten

Book/Report/Dissertation / PhD Thesis

PUBDB-2017-11604

Intra-Bunch-Train Transverse Dynamics in the Superconducting Accelerators FLASH and European XFEL

Hellert, T. (Corresponding author)Extern*DESY*

2017
Verlag Deutsches Elektronen-Synchrotron Hamburg

Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 149 pp. (2017) [10.3204/PUBDB-2017-11604] = Dissertation, Universität Hamburg, 2017

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Please use a persistent id in citations: doi:10.3204/PUBDB-2017-11604

Report No.: DESY-THESIS-2017-044

Abstract: FLASH and the European XFEL are linear accelerator driven SASE-FELs, operating in a pulsed mode with long bunch-trains. Multi-bunch FEL operation requires longitudinal and transverse stability within the bunch-train. The purpose of this work is to investigate the intra-bunch-train transverse dynamics at FLASH and XFEL. Key relationships of superconducting RF cavity operation, their misalignments and the resulting impact on the intra-bunch-train trajectory variation are described. In this thesis a numerical model is developed and simulations for different accelerating sections at FLASH and XFEL are performed. With the current operational setup significant intra-bunch-train trajectory variation must be considered, hence approaches for their reduction are discussed. The theoretical studies are compared to experimental results at FLASH. The observed trajectory variation during multi-bunch user runs is analyzed and related to causal intra-bunch-train variations of the RF and the following impact on the multi-bunch SASE performance. Furthermore, HOM-based cavity misalignment measurements are performed and the deduction of misalignments from multi-bunch data is considered.

Note: Dissertation, Universität Hamburg, 2017

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Appears in the scientific report 2017

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