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A source of polarized electrons based on photoemission of GaAsP.

MPS-Authors
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Jethwa,  J.
Department of NanoBiophotonics, MPI for biophysical chemistry, Max Planck Society;

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Schaefer,  F. P.
Abteilung Laserphysik, MPI for biophysical chemistry, Max Planck Society;

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Citation

Hartmann, W., Conrath, D., Gasteyer, W., Gessinger, H. J., Heil, W., Kessler, H., et al. (1990). A source of polarized electrons based on photoemission of GaAsP. Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, 286(1-2), 1-8. doi:10.1016/0168-9002(90)90200-P.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-0E79-F
Abstract
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.