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Realization of a Large-Acceptance Faraday Cup for 3 MeV Electrons

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arxiv 1811.12196 v1 pith:MDXWKNWX submitted 2018-11-27 physics.ins-det nucl-exphysics.acc-ph

Realization of a Large-Acceptance Faraday Cup for 3 MeV Electrons

R. Johnston , J. Bernauer , C. M. Cooke , R. Corliss , C. S. Epstein , P. Fisher , I. Fri\v{s}\v{c}i\'c , D. Hasell
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E. Ihloff J. Kelsey S. Lee R. G. Milner P. Moran S. G. Steadman C. Vidal
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classification physics.ins-det nucl-exphysics.acc-ph
keywords currentbeamfaradaymeasuremeasurementmicroampereacceptanceaccurate
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The design, construction, installation, and testing of a Faraday Cup intended to measure the current of a 3 MeV, 1 microampere electron beam is described. Built as a current monitor for a M{\o}ller scattering measurement at the MIT High Voltage Research Laboratory, the device combines a large angular acceptance with the capability to measure a continuous, low energy beam. Bench studies of its performance demonstrate current measurements accurate to the percent level at 1 microampere. The Faraday Cup was designed and constructed at MIT and has been in use at the HVRL since 2017, providing a significantly more detailed measurement of beam current than was previously available.

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