Progress on inverse Cherenkov laser accelerator expriment

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Abstract
Recent progress in understanding the experimental issues related to performing an inverse Cherenkov accelerator (ICA) experiment have been in two major areas. A comprehensive Monte Carlo computer model was developed that includes all pertinent effects, such as electron scattering and laser focusing of the electron beam. It also accurately models the laser beam focused through an axicon. The results of the model show that an appreciable amount of electron acceleration is possible using the anticipated conditions for the Brookhaven National Laboratory Accelerator Test Facility (ATF). It also predicts that for high γ e‐beams (≳1 GeV), the emittance growth of the e‐beam caused by gas scattering is not as severe as generally assumed. The second major accomplishment is the experimental proof‐of‐principle demonstration of various methods for producing a radially polarized annular laser beam that would be needed during the proposed ATF ICA experiment.

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