Assembly and method for monitoring the lateral position of a beam of ionizing radiation
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United States of America Patent
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Feb 7, 1989
Grant Date -
N/A
app pub date -
Dec 28, 1987
filing date -
Dec 28, 1987
priority date (Note) -
Expired
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Abstract
A transmission ion chamber assembly for detecting the lateral displacement of an ionizing beam has two ion chambers located one behind the other along the beam axis. Each chamber contains two electrode plates and a spacer which separates and electrically insulates the electrodes from each other. The electrodes of each chamber are inclined with respect to each other along a preselected measuring axis. The axes of both chambers are perpendicular to the beam axis and to each other. In operation, the collector electrodes furnish current signals which depend upon the position of the beam along the associated measuring axis. With orthogonal chambers, i.e. measuring axes, the beam position in a plane perpendicular to the beam axis can be determined and aligned, e.g. via beam steering coils surrounding the beam.
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