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Systematic studies of the microbunching and weak instability at short bunch lengths

Brosi, M.; Blomley, E. ORCID iD icon; Boltz, T.; Bründermann, E. ORCID iD icon; Caselle, M.; Gethmann, J. ORCID iD icon; Kehrer, B.; Kuske, P.; Papash, A.; Rota, L.; Schönfeldt, P.; Schreiber, P.; Schuh, M. ORCID iD icon; Schwarz, M.; Steinmann, J. L. ORCID iD icon; Weber, M.; Müller, A.-S. ORCID iD icon


At KARA, the Karlsruhe Research Accelerator of the Karlsruhe Institute of Technology synchrotron, the so-called short-bunch operation mode allows the reduction of the bunch length down to a few picoseconds. The microbunching instability resulting from the high degree of longitudinal compression leads to fluctuations in the emitted terahertz radiation. For highly compressed bunches at KARA, the instability occurs not only in one but in two different bunch-current ranges that are separated by a stable region. The additional region of instability is referred to as short-bunch-length bursting or weak instability. We will present measurements of the threshold currents and fluctuation frequencies in both regimes. Good agreement is found between the measurement and numerical solutions of the Vlasov-Fokker-Planck equation. This contribution is based on the PRAB paper Phys. Rev. Accel. Beams 22, 020701.

DOI: 10.23732/CYRCP-2020-009.335
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
KITopen-ID: 1000129152
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 335-339
Serie CERN Yellow Reports: Conference Proceedings ; 9
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