Phys. Rev. Lett. 81, 5816–5819 (1998)Observation of Self-Amplified Spontaneous-Emission-Induced Electron-Beam Microbunching Using Coherent Transition RadiationReceived 9 July 1998; published in the issue dated 28 December 1998 We report the measurement of electron-beam microbunching at the exit of a self-amplified spontaneous-emission free-electron laser (SASE FEL), by observation of coherent transition radiation (CTR). The CTR was found to have an angular spectrum much narrower than spontaneous transition radiation and a narrow-band frequency spectrum. The central frequency of the fundamental CTR spectrum is found to differ slightly from that of the SASE, a finding in disagreement with previously invoked CTR theory. The CTR measurement establishes the uniformity of microbunching in the transverse dimension, indicating the SASE FEL operates in a dominant transverse mode. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.5816
DOI:
10.1103/PhysRevLett.81.5816
PACS:
41.60.Cr, 41.60.Ap
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