Modified Faraday cup

Patent · Tue Sep 10 04:00:00 EDT 1996

OSTI ID:372601

Elmer, J W; Teruya, A T; O`Brien, D W

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: University of California
• 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
• OSTI ID: 372601
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM CURRENTS
BEAM MONITORING
DATA ACQUISITION
DATA PROCESSING
DESIGN
ELECTRON BEAMS
FARADAY CUPS
TOMOGRAPHY