Computer simulation of free-electron lasers with variable wigglers

The principles of nonuniform magnetic field accelerator theory are used to calculate several experimental parameters for the design of free electron lasers at 10.6 microns. The method of calculation takes into account the effects of current density, laser intensity, and energy distribution of the initial electron beam. Numerical solutions are obtained for the given initial conditions and initial values, and special calculations are made for the case of a nonuniform wiggler field. The gain of radiation of the laser is calculated to be about 1 to 3 percent. A table is presented which lists the five groups of typical parameters for the simulating calculations.