ENERGY DEGRADER
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United States of America Patent
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Issued Date -
Jun 16, 2016
app pub date -
Dec 16, 2015
filing date -
Dec 16, 2014
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Abstract
Disclosed embodiments include an energy degrader for attenuating the energy of a charged particle beam and comprising two energy attenuation members having different masses. The degrader further comprises a drive unit configured to move simultaneously the two energy attenuation members at respectively a first and a second speed across the particle beam during a first movement and to move the lightest of the two energy attenuation members at a third speed across the particle beam during a second movement, the third speed being higher than the first speed. More accurate and faster variation of the energy of the charged particle beam can hence be achieved.
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