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Feedback Design for Control of the Micro-Bunching Instability based on Reinforcement Learning

Boltz, Tobias; Brosi, Miriam; Bründermann, Erik ORCID iD icon; Haerer, Bastian ORCID iD icon; Kaiser, Peter; Pohl, Christoph; Schreiber, Patrick ORCID iD icon; Yan, Minjie; Asfour, Tamim; Müller, Anke-Susanne ORCID iD icon


The operation of ring-based synchrotron light sources with short electron bunches increases the emission of coherent synchrotron radiation in the THz frequency range. However, the micro-bunching instability resulting from self-interaction of the bunch with its own radiation field limits stable operation with constant intensity of CSR emission to a particular threshold current. Above this threshold, the longitudinal charge distribution and thus the emitted radiation vary rapidly and continuously. Therefore, a fast and adaptive feedback system is the appropriate approach to stabilize the dynamics and to overcome the limitations given by the instability. In this contribution, we discuss first efforts towards a longitudinal feedback design that acts on the RF system of the KIT storage ring KARA (Karlsruhe Research Accelerator) and aims for stabilization of the emitted THz radiation. Our approach is based on methods of adaptive control that were developed in the field of reinforcement learning and have seen great success in other fields of research over the past decade. We motivate this particular approach and comment on different aspects of its implementation.

Verlagsausgabe §
DOI: 10.5445/IR/1000129155
Veröffentlicht am 01.02.2021
DOI: 10.23732/CYRCP-2020-009.227
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Beschleunigerphysik und Technologie (IBPT)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 16.12.2020
Sprache Englisch
Identifikator ISBN: 978-92-9083-588-2
ISSN: 2519-8092 ; 2519-8084
KITopen-ID: 1000129155
HGF-Programm 54.01.01 (POF III, LK 01) ps- und fs-Strahlen
Erschienen in Proceedings of the ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators : Zermatt, Switzerland, 23 - 27 September 2019. Ed.: E. Métral
Veranstaltung ICFA mini-Workshop on "Mitigation of Coherent Beam Instabilities in particle accelerators" (MCBI 2019), Zermatt, Schweiz, 23.09.2019 – 27.09.2019
Verlag Europäische Organisation für Kernforschung (CERN)
Seiten 227-229
Serie CERN Yellow Reports : Conference proceedingsCERN Yellow Reports : Conference proceedings
Bemerkung zur Veröffentlichung Publisher: CERN Yellow Reports: Conference Proceedings
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