Generation and focusing of electron beams with initial transverse-longitudinal correlation
In charged particle beams, one of the roles played by space charge is to couple the transverse and longitudinal dynamics of the beam. This can lead to very complex phenomena which are generally studied using computer simulations. However, in some cases models based on phenomenological or analytic approximations can provide valuable insight into the system behavior. In this paper, we employ such approximations to investigate the conditions under which all the slices of a space charge dominated electron beam with slowly varying current could be focused to a waist with the same radius and at the same location, independent of slice current, and show that this can be accomplished approximately if the initial transverse-longitudinal correlation introduced onto the beam by the electron gun is chosen to compensate for the transverse-longitudinal correlation introduced onto the beam in the drift section. The validity of our approximations is assessed by use of progressively more realistic calculations. We also consider several design elements of electron guns that affect the initial correlations in the beams they generate.
- Colorado State Univ., Fort Collins, CO (United States) Dept. of Electrical and Computer Engineering.
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- OSTI Identifier:
- DOE Contract Number:
- Resource Type:
- Journal Article
- Resource Relation:
- Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 13
- American Institute of Physics (AIP)
- Research Org:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Org:
- Country of Publication:
- United States
- 71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; 43 PARTICLE ACCELERATORS CATHODES; ANODES; ELECTRON CORRELATION CALCULATIONS; CHARGED CURRENTS; ELECTRON BEAMS
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