Simulations of the TJNAF 10kW free electron laser

Abstract

The TJNAF Free Electron Laser (FEL) will be upgraded to operate at 10 kW average power in the near future.Multimode simulations are used to analyze the operation describing the evolution of short optical pulses in the far infrared wavelength regime. In an FEL that recirculates the electron beam, performance can depend on the electron beam distribution exiting the undulator. The effects of varying the undulator field strength and Rayleigh length of the resonator are explored, as well as the possibility of using an optical klystron. The simulations indicate that the FEL output power can reach the design goal of 10 kW. r

Short Rayleigh length free electron laser: Experiments and simulations

“…Except for z 0 < 0:3 where the experimental optical beam edges were cut off by the optical transport system to the detector, the z 0 dependence of the two results is in good agreement. Similar agreement has been reported for previous NPS simulations of JLab experiments [9]. Note also that, since the gain remains above threshold, there is no tendency for the power to decrease substantially at low z 0 for either the simulation or the experiment.…”

Lasing conditions of a free electron laser with helical wiggler

“…[2][3][4][5][6] The FEL oscillator can be considered as a FEL amplifier with a feedback. As with vacuum-tube devices, FEL devices can be divided into two classes: amplifiers and oscillators.…”

Simulations of the 100kW TJNAF FEL using a short Rayleigh length

“…The Thomas Jefferson National Accelerator Facility (TJNAF) may be able to modify their free-electron laser (FEL) [1,2] to an increased power output of 100 kW. The changes will involve increasing the electron beam energy to E e ¼ 210 MeV with a pulse repetition rate of O ¼ 750 MHz while maintaining a peak current of I ¼ 270 A in an electron pulse length of l e ¼ 0:1 mm.…”