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Polarized Electrons from High-Gradient Guns
To take advantage of the lower emittance associated with extraction
fields >>10 MV/m, a number of technological hurdles must be overcome
before photocathodes appropriate for generating polarized electrons
can be utilized in high-gradient guns. Both rf guns and very fast
ultra-high gradient (= or >1 GV/m) diode guns are anticipated. The
known problems-some of which may be more than just technical-are
delineated, and the present status of relevant research is reviewed.
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