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Potential Duplicate Authors:

• Sheffield, R., 2 publications
• Sheffield, J., 1 publications

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2 papers

title:	Measurements of gain larger than 10(5) at 12 mu m in a self-amplified spontaneous-emission free-electron laser
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year:	1998
14 authors:	Hogan, M. J. | C. Pellegrini | J. B. Rosenzweig | S. Anderson | Pedro Frigola | A. Tremaine | Fortgang, C. | D. C. Nguyen | R. L. Sheffield | Kinross-Wright, J. | A. Varfolomeev | Varfolomeev, A. A. | Tolmachev, S. | R. Carr
abstract:	We report measurements of very large output intensities corresponding to a gain larger than 10/sup 5/ for a single pass free-electron laser operating in the self-amplified spontaneous emission (SASE) mode at 12 mu m. We also report the observation and analysis of intensity fluctuations of the SASE radiation intensity in the high-gain regime. The results are compared with theoretical predictions and simulations. (18 References).
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title:	Observation of Self-Amplified Spontaneous-Emission-Induced Electron-Beam Microbunching Using Coherent Transition Radiation
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year:	1998
9 authors:	A. Tremaine | J. B. Rosenzweig | S. Anderson | Pedro Frigola | Hogan, M. | A. Murokh | C. Pellegrini | D. C. Nguyen | R. L. Sheffield
abstract:	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.
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