Abstract

A transmission photocathode was fabricated based on GaAs‐GaAsP strained superlattice layers on a GaP substrate and a 20 kV‐gun was built to generate the polarized electron beams with the diameter of a few micro‐meter. As the results, the reduced brightness of 1.3×107 A/cm2/sr and the polarization of 90% were achieved.

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