Coherent Smith-Purcell radiation for minimally invasive bunch length measurement at the subpicosecond time scale

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...

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Bibliographic Details
Published inPhysical review. Accelerators and beams Vol. 24; no. 4; p. 042803
Main Authors Heil, Philipp, Aulenbacher, Kurt, Matejcek, Christoph, Friederich, Simon, Bruker, Max, Fichtner, Frank
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.04.2021
Subjects
Beam currents
Electron beams
Energy recovery
Radiation
Space charge
Transportation systems
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Summary: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 of70μmcan 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.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.24.042803