Annual technical summary and status report on Contract N00014-79-C-0769 (Columbia University, New York, Bew York). Report for October 1987-September 1988

Technical Report · Thu Sep 01 04:00:00 EDT 1988

OSTI ID:6790139

Marshall, T C

Observations of Optical Guiding in a Raman Free-Electron Laser; Evidence for optical guiding of 1.7-mm-wavelength radiation along an electron beam in a Raman free-electron laser is obtained experimentally and compared with numerical simulations. Optical guiding is manifest as the interference effect of several waveguide modes; this is observed beyond the point of electron-beam termination. The experiment operates in the regime of exponential signal gain and appreciable electron-beam space charge. Sideband instabilities and optical guiding in a free-electron laser: experiment and theory; Experimental and theoretical studies of the effects of tapering and optical guiding on sideband instabilities are reported. The experiments are performed in the Columbia Raman FEL (about 2mm). Experiment shows sizeable reductions in sideband amplitudes in an efficiency-enhanced undulator. In the presence of optical guiding in a constant-period undular, the sideband shift is larger compared with the case when optical guiding does not occur.

• Research Organization: Cornell Univ., Ithaca, NY (USA). Dept. of Physics
• OSTI ID: 6790139
• Report Number(s): AD-A-200060/2/XAB
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
BEAMS
DATA
DOCUMENT TYPES
ELECTRON BEAMS
EXPERIMENTAL DATA
FREE ELECTRON LASERS
INFORMATION
LASER SPECTROSCOPY
LASERS
LEPTON BEAMS
MATHEMATICS
NUMERICAL ANALYSIS
NUMERICAL DATA
PARTICLE BEAMS
PROGRESS REPORT
RAMAN EFFECT
RAMAN SPECTROSCOPY
SPACE CHARGE
SPECTROSCOPY