Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 1, Pages 79-82Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.79
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We report the first measurements of the electron-beam microbunching z dependence in a self-amplified spontaneous-emission (SASE) free-electron laser (FEL) experiment by the observation of visible wavelength coherent transition radiation (CTR). In this case the fundamental SASE wavelength was at 537 nm, and the CTR exhibited an exponential intensity growth similar to the SASE radiation. In addition, we observed for the first time structure in the CTR angular distribution patterns that may he useful for optimizing SASE FEL performance.
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