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Title: Low-energy dc ion source for low operating pressure

We report on an experimental study of an ion source based on a Penning discharge with a cold hollow cathode in crossed electric and magnetic fields. The minimum vacuum chamber operating pressure was 3 × 10{sup −5} Torr for argon and 5 × 10{sup −5} Torr for hydrogen. The use of a hollow cathode allowed decreasing the discharge operating voltage down to 350 V at a discharge current of ∼100 mA. At a discharge current of 100 mA and beam accelerating voltage of 2 kV, the ion current was 2.5 mA for argon and 8 mA for hydrogen, and the ion beam on-axis current density 170 and 450 μA/cm{sup 2}, respectively. The current-voltage characteristics of the discharge and the radial ion beam current density distribution were measured. The influence of pressure on the discharge parameters and their time stability was investigated.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Institute of High Current Electronics, Russian Academy of Sciences, Akademichesky ave. 2/3, Tomsk 634055 (Russian Federation)
  2. (Russian Federation)
  3. Institute of Physics, University of São Paulo, C.P. 66318, CEP 05315-970 São Paulo S.P. (Brazil)
  4. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
22314656
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 8; Other Information: (c) 2014 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; ARGON; BEAM CURRENTS; CURRENT DENSITY; ELECTRIC FIELDS; ELECTRIC POTENTIAL; HOLLOW CATHODES; HYDROGEN; ION BEAMS; ION SOURCES; MAGNETIC FIELDS; PENNING DISCHARGES