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Continuous bunch-by-bunch spectroscopic investigation of the micro-bunching instability

Steinmann, Johannes L.; Brosi, Miriam; Bründermann, Erik; Caselle, Michele; Kehrer, Benjamin; Rota, Lorenzo; Schönfeldt, Patrik; Schuh, Marcel; Siegel, Michael; Weber, Marc; Müller, Anke-Susanne

Abstract (englisch):
Electron accelerators and synchrotrons can be operated to provide short emission pulses due to longitudinally compressed or sub-structured electron bunches. Above a threshold current, the high charge density leads to the micro-bunching instability and the formation of sub-structures on the bunch shape. These time-varying sub-structures on bunches of picoseconds-long duration lead to bursts of coherent synchrotron radiation in the terahertz frequency range. Therefore, the spectral information in this range contains valuable information about the bunch length, shape and sub-structures. Based on the KAPTURE readout system, a 4-channel single-shot THz spectrometer capable of recording 500 million spectra per second and streaming readout is presented. First measurements of time-resolved spectra are compared to simulation results of the Inovesa Vlasov-Fokker-Planck solver. The presented results lead to a better understanding of the bursting dynamics especially above the micro-bunching instability threshold.


Zugehörige Institution(en) am KIT Institut für Beschleunigerphysik und Technologie (IBPT)
Institut für Mikro- und Nanoelektronische Systeme (IMS)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator KITopen ID: 1000078139
HGF-Programm 54.01.01; LK 01
Erschienen in arXiv preprint arXiv:1710.09568
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