Coherent Smith-Purcell radiation for minimally invasive bunch length measurement at the subpicosecond time scale
【Abstract】
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, RMS bunch lengths of 70 μm can be achieved 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.
【Author】
Philipp Heil, Kurt Aulenbacher, Christoph Matejcek, Simon Friederich, Max Bruker, Frank Fichtner
【Journal】
Physical Review Accelerators and Beams(IF：1.8) Time：2021-04-22
