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On the Perturbation of Synchrotron Motion in the Micro-Bunching Instability

Boltz, Tobias 1; Brosi, Miriam 1; Haerer, Bastian ORCID iD icon 1; Schönfeldt, Patrik; Schreiber, Patrick ORCID iD icon; Yan, Minjie; Müller, Anke-Susanne 1
1 Institut für Beschleunigerphysik und Technologie (IBPT), Karlsruher Institut für Technologie (KIT)

Abstract:

The self-interaction of short electron bunches with their own radiation field can have a significant impact on the longitudinal beam dynamics in a storage ring. While higher bunch currents increase the power of the emitted CSR which can be provided to dedicated experiments, it simultaneously amplifies the strength of the self-interaction. Eventually, this leads to the formation of dynamically changing micro-structures within the bunch and thus fluctuating CSR emission, a phenomenon that is generally known as micro-bunching or micro-wave instability. The underlying longitudinal dynamics can be simulated by solving the VFP equation, where the CSR self-interaction can be added as a perturbation to the Hamiltonian. In this contribution, we focus on the perturbation of the synchrotron motion that is caused by introducing this additional wake field. Therefore, we adopt the perspective of a single particle and eventually comment on its implications for collective motion. We explicitly show how the shape of the parallel plates CSR wake potential breaks homogeneity in the longitudinal phase space and propose a quadrupole-like mode as potential seeding mechanism of the micro-bunching instability. ... mehr


Volltext §
DOI: 10.5445/IR/1000169575
Veröffentlicht am 25.03.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Beschleunigerphysik und Technologie (IBPT)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 11.2022
Sprache Englisch
Identifikator KITopen-ID: 1000169575
HGF-Programm 54.11.11 (POF IV, LK 01) Accelerator Operation, Research and Development
Verlag arxiv
Umfang 13 S.
Schlagwörter Accelerator Physics (physics.acc-ph)
Nachgewiesen in Dimensions
arXiv
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