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 \qty{2}{ns} bunch spacing but cannot detect possible \qty{330}{ps} satellite bunches induced by \qty{3}{GHz} travelling-wave structures. A mirrored silica crystal is considered for generating and guiding ChR towards a photodetector. Impacts of path-length dispersion in the crystal are assessed, alongside optimisation of photodetector placement relative to the crystal. Ability of existing diagnostics (such as a Fast Current Transformer) to resolve sub-ns bunch structure is assessed. Existing diagnostics serve to benchmark the performance of novel monitors exploiting the mirrored crystal. 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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