| Paper | Title | Page |
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MOPA44 |
Coherent Optical Transition Radiation at the SwissFEL Injector Test Facility | |
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| SwissFEL uses magnetic dispersive sections for bunch compression, which may cause micro-bunching within the electron bunch. Studies of Coherent Optical Transition Radiation (COTR) allow us to see whether or not such bunching is present. We present pilot results of COTR experiments carried out at the SwissFEL Injector Test Facility. Optical transition radiation is generated at an aluminium-coated silicon wafer that can be inserted into the beam. This can either be imaged to a CCD camera, or focused into a spectrometer with a spectral range from 200 nm to 925 nm. The compression of the electron bunches was varied, and data was recorded at different bunch lengths. Spectral data shows a clear gain of the signal and a shift towards the infrared for a stronger compression of the bunches. Results indicate that the spectrum fluctuates at maximum compression. This is consistent with fluctuations observed in COTR images. | ||