Prebunching in a collective Raman free-electron laser amplifier

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859328· OSTI ID:7169382

Wurtele, J S; Bekefi, G; Chu, R; Xu, K ^[1]

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1. Department of Physics, Research Laboratory of Electronics, and Plasma Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)

Experiments, theory, and simulations are reported on the effects of electron prebunching in a mildly relativistic, low-current (200 kV, 1 A) free-electron laser amplifier operating in the collective (Raman) regime at a frequency of {similar to}10 GHz. Prebunching is established by injecting an electromagnetic wave into a bifilar helical wiggler and then transporting the bunched beam into a second magnetic wiggler region. The wave growth rate, {Gamma}{equivalent to}(1/{ital P})({ital dP}/{ital dz}), is deduced from measurements of the radiation intensity as a function of interaction length. Observations show that prebunching can increase the radiation growth rate {Gamma} manyfold as compared with a system without prebunching.

• OSTI ID: 7169382
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:2; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
AMPLIFIERS
BEAM BUNCHING
BEAM CURRENTS
BEAM DYNAMICS
CONFIGURATION
CURRENTS
DISTANCE
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
FREE ELECTRON LASERS
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
HELICAL CONFIGURATION
INJECTION
INTAKE
INTERACTION RANGE
LASERS
MAGNETS
OPERATION
RADIATIONS
RAMAN EFFECT
RELATIVISTIC RANGE
SIMULATION
WIGGLER MAGNETS