Dortmund 2021 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 1: Beam Dynamics
AKBP 1.7: Vortrag
Montag, 15. März 2021, 17:30–17:45, AKBPa
Single-shot spectral fingerprints for continuous observation of the microbunching instability at KARA — •Miriam Brosi1, Erik Bründermann1, Carsten Mai3, Matthias Martin2, Martin Laabs4, Niels Neumann4, Patrick Schreiber2, Marcel Schuh1, Johannes L. Steinmann1, and Anke-Susanne Müller1,2 — 1IBPT, KIT, Karlsruhe — 2LAS, KIT, Karlsruhe — 3Technische Universität Dortmund — 4Technische Universität Dresden
The micro-bunching instability occurring in an electron storage ring for short electron bunches leads to the emission of coherent synchrotron radiation (CSR) in the terahertz range. This collective instability can be studied by observing the resulting fluctuations in the emitted CSR power with fast THz detectors. The measurements presented in this contribution were conducted at the KIT electron storage ring KARA (KArlsruhe Research Accelerator) in a dedicated short-bunch operation mode. For the measurements of these instability-induced CSR power fluctuations, an on-chip THz spectrometer providing a spectral fingerprint was used. The mm-sized chip contains eight antennas that are sensitive in different frequency ranges from 50 GHz up to 700 GHz, each connected to a Schottky-diode detector element. The on-chip spectrometer was read-out with the new version of the KArlsruhe Pulse Taking and Ultrafast Readout Electronics system, KAPTURE-2, providing continuous bunch-by-bunch data.
This work was supported by the BMBF projekt 05K16VKA NeoDyn (Federal Ministry of Education and Research).