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An inverse free-electron-laser accelerator

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7 Author(s)
Fisher, A.S. ; Dept. of Phys., Brookhaven Nat. Lab., Upton, NY, USA ; Gallardo, J.C. ; van Steenbergen, A. ; Ulc, S.
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Recent work at BNL on electron acceleration using the Inverse Free-Electron Laser (IFEL) has considered a low-energy, high-gradient, multi-stage linear accelerator. Experiments are planned at BNL's Accelerator Test Facility using its 50-MeV linac and 100-GW CO2 laser. We have built and tested a fast-excitation wiggler magnet with constant field, tapered period, and overall length of 47 cm. Vanadium-Permendur ferromagnetic laminations are stacked in alternation with copper, eddy-current-induced, field reflectors to achieve a 1.4-T peak field with a 4-mm gap and a typical period of 3 cm. The laser beam will pass through the wiggler in a low-loss, dielectriccoated stainless-steel, rectangular waveguide. The attenuation and transverse mode has been measured in waveguide sections of various lengths, with and without the dielectric. Results of 1-D and 3-D IFEL simulations, including wiggler errors, are presented foe several cases: the initial, single-module experiment with ΔE=39 MeV, a four-module design giving ΔE=100 MeV in a total length of 2 m, and an eight-module IFEL with ΔE=210 MeV

Published in:

Particle Accelerator Conference, 1993., Proceedings of the 1993

Date of Conference:

17-20 May 1993