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Title: Investigation of helium ion production in constricted direct current plasma ion source with layered-glows

Generation of helium ions is experimentally investigated with a constricted direct current (DC) plasma ion source operated at layered-glow mode, in which electrons could be accelerated through multiple potential structures so as to generate helium ions including He{sup 2+} by successive ionization collisions in front of an extraction aperture. The helium discharge is sustained with the formation of a couple of stable layers and the plasma ball with high density is created near the extraction aperture at the operational pressure down to 0.6 Torr with concave cathodes. The ion beam current extracted with an extraction voltage of 5 kV is observed to be proportional to the discharge current and inversely proportional to the operating pressure, showing high current density of 130 mA/cm{sup 2} and power density of 0.52 mA/cm{sup 2}/W. He{sup 2+} ions, which were predicted to be able to exist due to multiple-layer potential structure, are not observed. Simple calculation on production of He{sup 2+} ions inside the plasma ball reveals that reduced operating pressure and increased cathode area will help to generate He{sup 2+} ions with the layered-glow DC discharge.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Department of Nuclear Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of)
  2. Center for Advance Research in Fusion Reactor Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of)
  3. Samsumg Electronics Co. Ltd., Gyeonggi 445-701 (Korea, Republic of)
  4. (Korea, Republic of)
Publication Date:
OSTI Identifier:
22253627
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) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; APERTURES; BEAM CURRENTS; CATHODES; COLLISIONS; CURRENT DENSITY; DIRECT CURRENT; ELECTRIC POTENTIAL; EXTRACTION; HELIUM; HELIUM IONS; ION SOURCES; IONIZATION; PLASMA; POWER DENSITY