Dortmund 2021 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 6: Diagnostics, Control and Instrumentation I
AKBP 6.4: Vortrag
Mittwoch, 17. März 2021, 14:45–15:00, AKBPa
Coherent Smith-Purcell radiation for minimally invasive bunch length measurement at the subpicosecond time scale — •Philipp Heil1,2,3, Kurt Aulenbacher1,2, Max Bruker4, Frank Fichtner1, Simon Friederich2, and Christoph Matejcek1 — 1Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — 2Helmholtz Institut Mainz — 3GSI Helmholtzzentrum für Schwerionenforschung Darmstadt — 4Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
We have designed a tool to measure the bunch length of an electron beam in a minimally invasive way by means of coherent Smith-Purcell radiation (SPR). The technique has been employed successfully at a test apparatus for the Mainz Energy-recovery Superconducting Accelerator MESA, demonstrating it is possible to determine the bunch length while losing less than 0.6 % of the electron beam. The impact of the space charge on the bunch length can be reduced while tuning the longitudinal bunch preparation system during a live measurement at beam currents up to 1 mA. Doing so, it is possible to achieve RMS bunch lengths of 70 µm in a typical operating mode of the low-energy beam transport system of MESA. In addition to the bunch length measurements, typical properties of the generated SPR are demonstrated.