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Title: Magnetic field extraction of trap-based electron beams using a high-permeability grid

A method to form high quality electrostatically guided lepton beams is explored. Test electron beams are extracted from tailored plasmas confined in a Penning-Malmberg trap. The particles are then extracted from the confining axial magnetic field by passing them through a high magnetic permeability grid with radial tines (a so-called “magnetic spider”). An Einzel lens is used to focus and analyze the beam properties. Numerical simulations are used to model non-adiabatic effects due to the spider, and the predictions are compared with the experimental results. Improvements in beam quality are discussed relative to the use of a hole in a high permeability shield (i.e., in lieu of the spider), and areas for further improvement are described.
Authors:
; ;  [1]
  1. Physics Department, University of California, 9500 Gilman Drive, San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
22490018
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; ELECTRON BEAMS; GRIDS; MAGNETIC FIELDS; MAGNETIC SUSCEPTIBILITY; PARTICLES; PENNING EFFECT; PERMEABILITY; PLASMA; SHIELDS