Nonlinear simulation of a high-power, collective free-electron laser

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/27.142826· OSTI ID:7201274

Freund, H P ^[1]; Ganguly, A K ^[2]

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1. Science Applications Int. Corp., McLean, VA (US)
2. Naval Research Lab., Washington, DC (US)

In this paper a comparison is described between the three-dimensional nonlinear analysis and simulation code, ARACHNE, and a recent 33.4-GHz, collective, free-electron laser amplifier experiment at MIT. The experiment has demonstrated power levels of 61 ME ({approx}27% efficiency) without recourse to tapered magnetic fields, using a 750-keV/300-A electron beam with a nominal axial energy spread of 1.5% propagating through a cylindrical drift tube in the presence of a helical wiggler (B{sub w} {le} 1.8 kG, {lambda}{sub w} = 3.18 cm) and an axial guide magnetic field (B{sub 0} {le} 12 kG). Significant differences in the character of the emission were found based upon the direction of the guide magnetic field. The ARACHNE simulation is in substantial agreement with the experiment. The source of this power reduction appears to be a previously unsuspected effect on the electron orbits due to the wiggler inhomogeneity. Agreement with the much lower power levels found when the wiggler and guide fields are parallel, however, requires the assumption of a substantial increase in the energy spread of the beam.

• OSTI ID: 7201274
• Journal Information: IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States), Vol. 20:3; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FREE ELECTRON LASERS
POWER
A CODES
COMPARATIVE EVALUATIONS
ELECTRON BEAMS
EXPERIMENT PLANNING
NONLINEAR PROBLEMS
SIMULATION
WIGGLER MAGNETS
BEAMS
COMPUTER CODES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
EVALUATION
LASERS
LEPTON BEAMS
MAGNETS
PARTICLE BEAMS
PLANNING
426002* - Engineering- Lasers & Masers- (1990-)
990200 - Mathematics & Computers