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abstract:
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We present an Inverse Free Electron Laser accelerator proposed for construction at the
UCLA Neptune Laboratory. This experiment will use a 1 TW CO2 laser to accelerate through
two strongly tapered undulators an electron beam from 16 MeV up to 5 MeV. The scheme
proposed is the diffraction dominated IFEL interaction. The Raleigh range of the laser beam is
about 2 cm, much shorter than the interaction length (the undulator length is 50 cm). In this
regime adiabatic capture is possible in the first part of the undulator. In the focus region, we
propose a solution to the problem of the dephasing between electrons and photons due to the
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