Modified Faraday cup
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 is disclosed. 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 from 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. 12 figs.
- Research Organization:
- Univ. of California (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- Univ. of California, Oakland, CA (United States)
- Patent Number(s):
- US 5,554,926/A/
- Application Number:
- PAN: 8-509,552; TRN: 96:023785
- OSTI ID:
- 372601
- Resource Relation:
- Other Information: PBD: 10 Sep 1996
- Country of Publication:
- United States
- Language:
- English
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System for tomographic determination of the power distribution in electron beams
System for tomographic determination of the power distribution in electron beams