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The generation and manipulation of low energy positron beams. / Jonathan Clarke

Swansea University Author: Jonathan Clarke

Abstract

A laboratory based low energy positron beamline has been constructed and tested. The techniques underlying this device are described, as are modifications and improvements which were made to the conventional operation of such apparatus. The use of this beamline in conjunction with a novel positron a...

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Published: 2005
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42279
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Abstract: A laboratory based low energy positron beamline has been constructed and tested. The techniques underlying this device are described, as are modifications and improvements which were made to the conventional operation of such apparatus. The use of this beamline in conjunction with a novel positron accumulator using a two-stage buffer gas cooling method is discussed. Its ability to operate in the 1-10 Hz range, providing bursts of ~ 105 positrons with a time width of ~ 20 ns is described. The deviation from the expected ideal behaviour of this accumulator is recorded, and the efficacy of this departure in detecting performance problems presented. A number of applications of the positron apparatus are described. A series of simulations on a positron time-bunching apparatus are expounded. Agreement with the observed timing resolution was found only when non-ideal processes occurring within the device were considered. Suggestions towards possible optimization of these non-ideal processes to further improve the timing resolution of such an apparatus are put forward.
Keywords: Applied physics.;Nuclear physics and radiation.
College: College of Science