Abstract
Generation of a DC electron beam in the future Fermilab electron cooler employs an electrostatic acceleration and a beam energy recovery, so that electrons are decelerated from the nominal energy of 4.3 MeV they have in the cooling section to few keV in the collector. Stable performance of this scheme requires a current loss /spl delta/I below 10 /spl mu/A at the beam current up to the nominal value of I=0.5 A. One of sources of the loss is a back flow of secondary electrons from the beam collector. The paper discusses principles and performance of a collector with the low current loss.
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