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21 October 1986 Simulation Studies Of Gas Collision Effects In Inverse Cherenkov Accelerators
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Proceedings Volume 0664, High Intensity Laser Processes; (1986)
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada
In Inverse Cherenkov laser accelerators, a passive gas is used to match the phase velocity of a suitably shaped laser field pattern to the electron velocity. Electron collisions with the gas molecules cause energy loss and have also a beam scattering effect. The former is small at high energies (multi Gev), even for pressures in the one atmosphere range, if the proper gas is used. Elastic collision scattering, however, is important because it can displace the electrons to less favorable positions within the field pattern. Computer simulation trajectory studies were carried out using the average of many electrons started at the same initial conditions and moving through the scattering medium while interacting with the laser fields. Both longitudinal and transverse forces were modelled, and the increase in electron mass with energy was included. The results show there is a transverse focusing force due to the laser fields, very effective for confinement over a wide range of laser phase angles within the acceleration region, so a small electron beam cross-section can be maintained even near the maximum acceleration condition and over extended distances. Individual electron trajectories display the transverse oscillation behavior expected from an approximately linear restoring force combined with random angular perturbations. The acceleration gradient differential caused by the transverse field variation is thus smoothed over the oscillation period. The above data confirm the suitability of this method of acceleration for the production of high-energy electron beams and give quantitative expression to the resulting beam properties.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jorge R Fontana and Gamini S Atukorala "Simulation Studies Of Gas Collision Effects In Inverse Cherenkov Accelerators", Proc. SPIE 0664, High Intensity Laser Processes, (21 October 1986);

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