Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Beam of atomic particles
Patent
1992-12-28
1995-01-17
Regan, Maura K.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Beam of atomic particles
250397, 250396ML, G01R 1300, G01T 129
Patent
active
053828950
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-dimensional 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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"A System For The Tomographic Determination Of The Power Distribution In Electron Beams", A. Teruya et al., Proceedings of the Conference on The Laser and Electron Beam in Welding, Cutting and Surface Treatment-State of the Art 1991, Published Jan. 1992 by Babish Material Corp., pp. 125-140.
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Elmer John W.
O'Brien Dennis W.
Teruya Alan T.
Regan Maura K.
Regents of the University of California
Sartorio Henry P.
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