Modeling of induction-linac based free-electron laser amplifiers

Conference · Thu Dec 01 04:00:00 EST 1988

OSTI ID:6637071

Jong, R A; Fawley, W M; Scharlemann, E T

We describe the modeling of an induction-linac based free-electron laser (IFEL) amplifier for producing multimegawatt levels of microwave power. We have used the Lawrence Livermore National Laboratory (LLNL) free-electron laser simulation code, FRED, and the simulation code for sideband calculations, GINGER for this study. For IFEL amplifiers in the frequency range of interest (200 to 600 GHz), we have devised a wiggler design strategy which incorporates a tapering algorithm that is suitable for free-electron laser (FEL) systems with moderate space-charge effects and that minimizes spontaneous noise growth at frequencies below the fundamental, while enhancing the growth of the signal at the fundamental. In addition, engineering design considerations of the waveguide wall loading and electron beam fill factor in the waveguide set limits on the waveguide dimensions, the wiggler magnet gap spacing, the wiggler period, and the minimum magnetic field strength in the tapered region of the wiggler. As an example, we shall describe an FEL amplifier designed to produce an average power of about 10 MW at a frequency of 280 GHz to be used for electron cyclotron resonance heating of tokamak fusion devices. 17 refs., 4 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6637071
• Report Number(s): UCRL-98940; CONF-890154-1; ON: DE89004806
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ALGORITHMS
CLOSED PLASMA DEVICES
COMPUTER CODES
COMPUTERIZED SIMULATION
DESIGN
DIFFERENTIAL EQUATIONS
ECR HEATING
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
EQUATIONS
EQUATIONS OF MOTION
EQUIPMENT
F CODES
FREE ELECTRON LASERS
G CODES
HEATING
HIGH-FREQUENCY HEATING
LASERS
MAGNETIC FIELDS
MAGNETS
MATHEMATICAL LOGIC
MATHEMATICAL SPACE
MICROWAVE RADIATION
PARTIAL DIFFERENTIAL EQUATIONS
PHASE SPACE
PLASMA HEATING
RADIATIONS
SIMULATION
SPACE
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WAVEGUIDES
WIGGLER MAGNETS