Abstract
A 25 MeV electron beam from an rf linear accelerator is propagated through neon gas at pressures from 80 to 760 Torr. The longitudinal increase of the beam's diameter is determined by processing images of optical emission profiles. To account for multiple scattering in the gas, a Monte Carlo simulation is performed and the results are in good agreement with the experimental results. The Monte Carlo algorithm is implemented in an FEL particle code to calculate realistically the performance of gas-loaded free electron lasers. The longitudinal current density decrease of the electron beam deteriorates the lasing process significantly when the wiggler length is more than several tens centimeters.
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