Description of FEL3D: A three dimensional simulation code for TOK and FEL
Abstract
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 superradiant harmonic frequency emission of electrons which are being bunched by an external laser beam while propagating in an undulator magnet. This superradiant 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 semianalytical concept. Instead of a full numerical solution of the MaxwellLorentz equations, the trajectories of the electron in the wiggler field are calculated analytically, and the radiation fields are expanded in terms of free space eigenmodes. This approach permits efficient computation, with a computation time of about 0.1 sec/electron on the BNL IBM 3090.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 October 1988
 Bibcode:
 1988STIN...8919540D
 Keywords:

 Computer Programs;
 Computerized Simulation;
 Electron Beams;
 Free Electron Lasers;
 Klystrons;
 Distribution Functions;
 Equations Of Motion;
 Trajectories;
 Lasers and Masers