Utilization of Coherent Transition Radiation to Measure the Evolution of Electron-beam Microbunching in a SASE FEL Experiment

Alex Lumpkin, ANL/AOD

Host: K.-J. Kim

The first measurements of the z-dependent evolution of electronbeam microbunching as revealed through coherent transition radiation (CTR) measurements in a visible self-amplified spontaneous emission (SASE) free-electron laser (FEL) experiment will be presented. The exponential growth rate of the CTR was found to be similar to that of the UR and consistent with simulations using the code GENESIS. In addition, a discussion of observed structures in the CTR angular distribution patterns will be presented for both the thermionic rf gun and PC rf gun beams. These latter effects may be useful for optimizing SASE FEL performance.

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