HIGH POWER ALLISON SCANNER FOR ELECTRONS

TRIUMF has designed, built and commissioned an “Allison” emittance scanner for electrons up to 300 keV in energy and average power up to 1 kW. Transverse phase space as large as 1600 πµm can be measured with a resolution of 0.03 µm, in a high vacuum environment 10 -9 Torr. 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 experimental results of first tests at 60 keV with a thermionic electron gun, up to 660 W at 99% duty factor. Emittance contours were measured at high resolution for a variety of focusing conditions and intensities.