Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Beam of atomic particles
Patent
1995-07-31
1996-09-10
Regan, Maura K.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Beam of atomic particles
250397, G01R 1300
Patent
active
055549268
ABSTRACT:
A tomographic technique for measuring the current density distribution in electron beams using electron beam profile data acquired from a modified Faraday cup to create an image of the current density in high and low power beams. The modified Faraday cup includes a narrow slit and is rotated by a stepper motor and can be moved in the x, y and z directions. The beam is swept across the slit perpendicular thereto and controlled by deflection coils, and the slit rotated such that waveforms are taken every few degrees form 0.degree. to 360.degree. and the waveforms are recorded by a digitizing storage oscilloscope. Two-din-tensional and three-dimensional images of the current density distribution in the beam can be reconstructed by computer tomography from this information, providing quantitative information about the beam focus and alignment.
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Elmer John W.
O'Brien Dennis W.
Teruya Alan T.
Carnahan L. E.
Regan Maura K.
Regents of the University of California
Sartorio Henry P.
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