Optical properties and design of the University of Manitoba proton microprobe
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Date
1987
Authors
Abdul-Retha, Kosai
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Abstract
Since 1953 when the first device was built, the proton micropobe has become increasingly important as an analytical tool. This thesis describes work carried out to design the Manitoba Proton Microprobe. The Manitoba Microprobe is based on the "Russian quadruplet" lens system. The design goal was to achieve a minimum beam spot size using an iterative optimization procedure to arrive at a set of compromise values for several parameters. The optical characteristics of the "Russian quadruplet" lens configuration were investigated. A similar analysis was made on the pre-microprobe lens system; a magnetic doublet configuration. The microprobe system is optimized so that a spot diameter of 22.5 um is achieved for the range of proton energies provided by the cyclotron. A brief review of some existing proton microprobes is given with the description of the advantage of the Manitoba Proton Microprobe System.