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- A. Laxdal, F. Ames, R.A. Baartman, D. Brennan, S.R. Koscielniak, D.B. Morris, W.R. Rawnsley, P. Vincent, G. Waters, D. Yosifov
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
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TRIUMFs new Allison emittance scanner is designed to measure the emittance of a 100-300 keV electron beam at an average current of 10 mA (1 kW beam power cw) with a phase space area resolution of 0.032 mm-mrad, in a high vacuum environment 10-9 Torr. The emittance scanner has been tested with a beam produced by a 100keV thermionic electron source. The source is modulated at frequency of 650 MHz and can be operated with a macro pulse structure to allow duty factors of less than 0.1 % up to cw operation. The expected transverse emittance is 4εrms ≤ 20 π mm-mrad. This paper discusses the engineering challenges of designing an Allison scanner for a high intensity electron beam, the components and materials used, as well as the technologies introduced. Also included are the experimental results of first tests with the 100 keV source. Emittance contours were measured at high resolution for a variety of focusing conditions and intensity. Detailed phase space images have been made, and used to analyze and improve the electron gun design. The emittance values obtained are consistent with independent measurements using a scintillator-type profile monitor, and a simple analytic model for a thermionic source.
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