Abstract
We present an analysis on the effect of the finite bandwidth of a detector on the observed intensity of coherent transition radiation (CTR) produced by a long train of microbunches. The parameters of the planned CTR bunch length measurement for the Staged Electron Laser Acceleration (STELLA) experiment on the ATF linac at Brookhaven National Laboratory (BNL) are used as an illustrative example. We show how the effective number of bunches contributing to the observed coherent radiation depends on the band width of the detector. We conclude that meaningful CTR bunch length measurements on the STELLA experiment are possible using fairly wide band pass filters, e.g., ∼5%. Micropulse widths of ∼1–3 μm (3–10 fs) FWHM can easily be distinguished by observing up to 5–6 harmonics of the 10.6-μm bunch spacing. This analysis should also be applicable to other radiation produced by microbunches, such as coherent Cerenkov and synchrotron radiation.
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