A cryostat system incorporating a low-energy positron beam for surface measurements down to Temperatures below 2 K is currently under construction at the Royal Holloway and Bedford New College. The positron beam has recently been brought into operation and its operating characteristics have been evaluated. Positrons from a22Na source are converted with an efficiency of ε=2×10−4 and transported magnetically at 1.5 V above the work function to a target at the bottom of a cryostat. The transmission of a 7 mm diameter beam is found to be constant over a range of axial field strengths from 40 to 50 G.
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Rice-Evans, P.C., Britton, D.T. & Cowan, B.P. A vertical positron beam for low-temperature surface studies. Appl. Phys. A 43, 283–285 (1987). https://doi.org/10.1007/BF00635184