ISSN:
1432-0630
Keywords:
78.70B
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00635184
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