Phase-space matching in a 5 m wiggler using optical-transition radiation,☆☆

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Abstract

Free electron lasers (FELs) operating at optical wavelengths and using long wigglers require precise electron-beam position and size measurements in front of and inside the wiggler. Currently used electron-beam view screens using either a fluorescent material (such as alumina, Al2O3) or a radiating Cherenkov medium (like quartz) both have resolution limitations, since the light is produced in the volume of the screen material. To improve our screen resolution we have investigated the use of optical-transition radiation (OTR) as an electron-beam diagnostic inside the Boeing/Spectra Technology 5 m wiggler. Thin sheets of polished aluminum were used for the screens and thin shadow shields were placed in front of the screens to block the spontaneous light produced upstream in the wiggler. Beam-size data taken using these screens is presented and compared to that determined with the original alumina screens. A first-order beam matrix formula for electron-beam matching to the wiggler is derived and applied to the data.

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This research was done at: Boeing Physical Sciences Research Center, Mail Stop 2R-00, P.O. Box 3999, Seattle, WA 98124, USA.

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Funded by U.S. Army Strategic Defense Command under contract DASG60-87-C-0052.

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