Developments in the Trapping and Accumulation of Slow Positrons using the Buffer Gas Technique

摘要

A compact, two-stage positron accumulator has been designed, constructed and tested at Swansea, as part of a larger experiment to study Rydberg states of the positronium atom. It uses the well-understood nitrogen buffer gas technique to trap and accumulate positrons obtained from a Na-22 radioactive source, and slowed by a solid neon moderator. The main development this system embodies over previous accumulators is reduced physical dimension, made possible by the shorter storage times required.