Phys. Rev. Lett. 86, 79–82 (2001)First Observation of z-Dependent Electron-Beam Microbunching Using Coherent Transition RadiationReceived 21 July 2000; published in the issue dated 1 January 2001 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 be useful for optimizing SASE FEL performance. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.79
DOI:
10.1103/PhysRevLett.86.79
PACS:
41.60.Cr, 41.60.Ap
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