System for tomographic determination of the power distribution in electron beams
A tomographic technique is disclosed 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. 12 figures.
- Issue Date:
- OSTI Identifier:
- 6614602
- Assignee:
- University of California, Oakland, CA (United States) PTO; EDB-95-030833
- Patent Number(s):
- US 5382895; A
- Application Number:
- PPN: US 7-996892
- Contract Number:
- W-7405-ENG-48
- Resource Relation:
- Patent File Date: 28 Dec 1992
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; BEAM MONITORS; DESIGN; ELECTRON BEAMS; CURRENT DENSITY; BEAM OPTICS; COMPUTERIZED TOMOGRAPHY; DIGITIZERS; FARADAY CUPS; IMAGE PROCESSING; BEAMS; DIAGNOSTIC TECHNIQUES; ELECTRONIC CIRCUITS; LEPTON BEAMS; MEASURING INSTRUMENTS; MONITORS; PARTICLE BEAMS; PROCESSING; PULSE CIRCUITS; SIGNAL CONDITIONERS; TOMOGRAPHY 430300* -- Particle Accelerators-- Auxiliaries & Components