Description of FEL3D: A three dimensional simulation code for TOK and FEL

Technical Report · Thu Oct 20 00:00:00 EDT 1988

DOI:https://doi.org/10.2172/6564685· OSTI ID:6564685

Dutt, S; Friedman, A; Gover, A

FEL3D is a three dimensional simulation code, written for the purpose of calculating the parameters of coherent radiation emitted by electrons in an undulator. The program was written predominantly for simulating the coherent super-radiant harmonic frequency emission of electrons which are being bunched by an external laser beam while propagating in an undulator magnet. This super-radiant emission is to be studied in the TOK (transverse optical klystron) experiment, which is under construction in the NSLS department at Brookhaven National Laboratory. The program can also calculate the stimulated emission radiometric properties of a free electron laser (FEL) taking into account three dimensional effects. While this application is presently limited to the small gain operation regime of FEL's, extension to the high gain regime is expected to be relatively easy. The code is based on a semi-analytical concept. Instead of a full numerical solution of the Maxwell-Lorentz equations, the trajectories of the electron in the wiggler field are calculated analytically, and the radiation fields are expanded in terms of free space eigen-modes. This approach permits efficient computation, with a computation time of about 0.1 sec/electron on the BNL IBM 3090. The code reflects the important three dimensional features of the electron beam, the modulating laser beam, and the emitted radiation field. The statistical approach is based on averaging over the electron initial conditions according to a given distribution function in phase space, rather than via Monte-Carlo simulation. The present version of the program is written for uniform periodic wiggler field, but extension to nonuniform fields is straightforward. 4 figs., 5 tabs.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6564685
• Report Number(s): BNL-41995; ON: DE89005529
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FREE ELECTRON LASERS
F CODES
KLYSTRONS
COMPUTERIZED SIMULATION
DISTRIBUTION FUNCTIONS
ELECTRON BEAMS
EQUATIONS OF MOTION
LASER RADIATION
STATISTICS
SYNCHROTRON RADIATION
THREE-DIMENSIONAL CALCULATIONS
TRAJECTORIES
WIGGLER MAGNETS
BEAMS
BREMSSTRAHLUNG
COMPUTER CODES
DIFFERENTIAL EQUATIONS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUATIONS
EQUIPMENT
FUNCTIONS
LASERS
LEPTON BEAMS
MAGNETS
MATHEMATICS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE BEAMS
RADIATIONS
SIMULATION
420300* - Engineering- Lasers- (-1989)
654001 - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments
990210 - Supercomputers- (1987-1989)