Design and experimental verification of a bunch length monitor based on coherent Cherenkov diffraction radiation

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This paper presents the design and experimental commissioning of a noninvasive electron bunch length monitor based on the detection of coherent Cherenkov diffraction radiation (ChDR). The measurement technique effectively eliminates the influence of bunch-by-bunch charge fluctuations, as each detector measures the signal from the same bunch while mitigating the impact of bunch position jitter on the measurements, providing a potential real-time diagnostic tool with significant operational advantages. The sensitivity of the measurements to both bunch length and longitudinal bunch profile was experimentally demonstrated, with results validated against invasive radio frequency deflector measurements at the CLEAR electron test facility at CERN. The ChDR bunch length monitor can be applied to accelerators operating with ultrashort bunches.