Abstract
Summary form only given. A high brightness and short pulse electron source is under development for use in a free electron laser and in electron-photon scattering experiments. Accelerated photoelectrons have been produced from a 1.5 cell 8.5 GHz RF gun using an amplified 100 fs ultra-violet laser pulse. Ongoing improvements in the laser and RF system should result in achieving desired system performance: 5 MeV electrons in 1.5 ps, 1 nC bunches with a normalized RMS emittance of 2.5 mm-mrad. Electron bunches would be delivered in bursts of 100 pulses at 2.4 GHz every 10 Hz to drive a chirped pulse free electron laser. Such a microwave source, based on coherent emission of synchrotron radiation, could achieve power levels of 2.2 MW in a 15 ps FWHM pulse with a bandwidth extending from 125 to 225 GHz. The photoinjector will also provide an ideal source of relativistic electrons for investigating basic interactions: nonlinear Compton scattering, Kapitza-Dirac scattering and pondermotive scattering (laser acceleration).
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