Speaker
Description
Radiative temporal diagnostics like Cherenkov diffraction radiation easily offer ps-resolution but require in-vacuum operation. For detectors in air, prompt Cherenkov radiation (ChR) provides ps-resolution while greatly reducing deployment complexity. We investigate such in-air ChR diagnostics to resolve sub-ns bunch structure at the Australian Synchrotron's injector linac. Existing monitors can resolve 2 ns bunch spacing but cannot detect possible 330 ps satellite bunches induced by 3 GHz travelling-wave structures. A mirrored silica crystal is used to generate and guide ChR towards a silicon photomultiplier. Impacts of chromatic and path-length dispersion in the crystal are assessed, alongside exclusion of electron incidence on photodetector electronics. Suitability for resolution of ChR with a higher bandwidth metal-semiconductor-metal photodiode is determined. Measurements are corroborated with a silicon avalanche photodiode for sampling synchrotron radiation in the linac-to-booster transfer line. These techniques support improved longitudinal phase-space measurement, thus increasing injection efficiency, improving bunch purity, and optimising RF-phasing in a dual-RF system.
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