A source of polarized electrons based on photoemission of GaAsP.
- Hartmann, W.
- Conrath, D.
- Gasteyer, W.
- Gessinger, H.
- Heil, W.
- Kessler, H.
- Koch, L.
- Reichert, E.
- Andresen, H.
- Kettner, T.
- Wagner, B.
- Ahrens, J.
- Jethwa, J.
- Schaefer, F.
DOIAbstract
The source described is based on photoemission of electrons from 100-GaAs0.62P0.38 activated to negative electron affinity. It is built to inject a beam of polarized electrons into the 350 MeV linear accelerator in Mainz. It is capable of delivering a mean current of 28 μA spin-polarized longitudinally to a degree of 0.44. The lifetime of the cathode under operational conditions is better than 200 h. The source was successfully run in a parity experiment, in which the analysing power of quasielastic scattering from beryllium for longitudinally polarized electrons was measured
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