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Ampere Average Current Photoinjector and Energy Recovery Linac
by K. Smith, P. Johnson, D. Holmes, L. Phillips, P. Cameron, A. Todd, A. Burger, A. Hershcovitch, J. Delayen, H. Hahn, W. Funk, Ilan Ben-Zvi, D. Gassner, D. Kayran, J. Kewisch, T. Roser, H. C. Hseuh, K.-C. Wu, A. Burrill, X. Chang, Y. Zhao, T. Srinivasan-Rao, A. Nicoletti, J. Rank, A. Favale, H. Bluem, G. McIntyre, R. Lambiase, A. Zaltsman, J. Scaduto, Joe Preble, Mike Cole, John Rathke, Tom Schultheiss, R. Calaga, Vladimir N. Litvinenko ยท 2004
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High-power Free-Electron Lasers were made possible by advances in superconducting linac operated in an energy-recovery mode, as demonstrated by the spectacular success of the Jefferson Laboratory IR-Demo. In order to get to much higher power levels, say a fraction of a megawatt average power, many technological barriers are yet to be broken. BNL's Collider-Accelerator Department is pursuing some of these technologies for a different application, that of electron cooling of high-energy hadron beams. I will describe work on CW, high-current and high-brightness electron beams. This will include a description of a superconducting, laser-photocathode RF gun employing a new secondary-emission multiplying cathode and an accelerator cavity, both capable of producing of the order of one ampere average current.