A simplified GaAs polarized electron source

We report operational and construction details of a simplified GaAs polariz ed electron source. It is contained in a modified 4.63 in. Conflat four-way cross, and uses a single 56 l/s turbomolecular pump. The design incorporat es multiple cesiators to extend source lifetime, a new spring-clamp GaAs cr ystal mounting design to provide uniform crystal heating, and a very simple tubular 90 degrees electrostatic deflector. We also discuss matters relate d to preparing, heat cleaning, and activating the GaAs crystal. (C) 1999 Am erican Institute of Physics. [S0034- 6748(99)04010-1].