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Title: Electron density profile measurements at a self-focusing ion beam with high current density and low energy extracted through concave electrodes

The self-focusing phenomenon has been observed in a high current density and low energy ion beam. In order to study the mechanism of this phenomenon, a special designed double probe to measure the electron density and temperature is installed into the chamber where the high current density ion beam is injected. Electron density profile is successfully measured without the influence of the ion beam components. Estimated electron temperature and density are ∼0.9 eV and ∼8 × 10{sup 8} cm{sup −3} at the center of ion beam cross section, respectively. It was found that a large amount of electrons are spontaneously accumulated in the ion beam line in the case of self-forcing state.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [3]
  1. Department of Engineering Mechanics and Energy, University of Tsukuba, Ibaraki (Japan)
  2. (AIST), Ibaraki (Japan)
  3. Innovative Plasma Technologies Group, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)
  4. (Japan)
Publication Date:
OSTI Identifier:
22253723
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CROSS SECTIONS; CURRENT DENSITY; ELECTRODES; ELECTRON DENSITY; ELECTRON TEMPERATURE; EV RANGE 01-10; FOCUSING; ION BEAMS; MEASURING INSTRUMENTS; MEASURING METHODS