Abstract
A prototype polarized-electron source has been constructed and results are reported. It is based on electron-hydrogen spin-exchange collisions using a longitudinal-geometry electron trap and teflon coatings to contain the state-selected atomic-hydrogen target. This scaled-down prototype is compatible with an electron linac and produces an extracted pulse of about 107 electrons/μs with about 60% polarization and 50–60 Hz repetition rate. Construction of a more intense (1010 or more electrons per pulse) full-scale device based upon this technique is also discussed. The average measured total electron-hydrogen spin-exchange cross section for 5–10 eV electrons is estimated to be in the range (0.5–1.55) × 10−15 cm2.
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