[SLAC Pubs and Reports]
ILC @ SLAC R&D Program for a Polarized RF Gun
Photocathode rf guns produce high-energy low-emittance electron beams. DC guns
utilizing GaAs photocathodes have proven successful for generating polarized
electron beams for accelerators, but they require rf bunching systems that
significantly increase the transverse emittance of the beam. With higher
extraction field and beam energy, rf guns can support higher current densities
at the cathode. The source laser system can then be used to generate the high
peak current, relatively low duty-factor micropulses required by the ILC
without the need for post-extraction rf bunching. The net result is that the
injection system for a polarized rf gun can be identical to that for an
unpolarized rf gun. However, there is some uncertainty as to the survivability
of an activated GaAs cathode in the environment of an operating rf gun.
Consequently, before attempting to design a polarized rf gun for the ILC, SLAC
plans to develop an rf test gun to demonstrate the rf operating conditions !
suitable for an activated GaAs cathode.
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