OBSERVATIONS OF FREQUENCY CHIRPING AND PHASE OF A FREE-ELECTRON LASER-AMPLIFIER

Authors
BEKEFI G CHEN B CONDE ME MASTOVSKY I RICCI K TAYLOR CJ VOLFBEYN P
Citation
G. Bekefi et al., OBSERVATIONS OF FREQUENCY CHIRPING AND PHASE OF A FREE-ELECTRON LASER-AMPLIFIER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 341(1-3), 1994, pp. 119-123
Citations number
14
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
341
Issue
1-3
Year of publication
1994
Pages
119 - 123
Database
ISI
SICI code
0168-9002(1994)341:1-3<119:OOFCAP>2.0.ZU;2-G
Abstract
We report observations of frequency chirping and phase of a free elect ron laser amplifier operating in the Raman regime. The FEL is driven b y a mildly relativistic electron beam (750 kV, 25 ns) subjected to a c ombined axial magnetic field and a helical wiggler field. The input in to the FEL amplifier is provided by a high power magnetron tuned to a frequency of 33.39 GHz. Phase and frequency shifts are measured both a s a function of time and interaction length. It is found that in the G roup I regime of FEL operation the output frequency is upshifted by ap proximately 100 MHz, but smaller upshifts are observed in the Group II or the Reversed Field configurations.