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Title: Note: Enhanced production of He{sup +} from the Versatile Ion Source (VIS) in off-resonance configuration

The Versatile Ion Source (VIS) is a microwave discharge ion source installed at INFN-LNS and here used as test-bench for the production of high intensity low emittance proton beams and for studies on plasma physics. A series of measurements have been carried out with VIS in order to test the source with light ions. In particular a He{sup +} beam has been characterized in terms of plasma discharge parameters. The experiment has been triggered by the observation of X-radiation emission from the plasma for some configuration of the magnetic field profile. The plasma electron energy distribution function is in fact modified when in some regions of the plasma chamber under-resonance discharge takes place, fulfilling the condition that allows the electromagnetic wave to electrostatic wave conversion. These tests allowed obtaining more than 50 mA of He{sup +} beams.
Authors:
; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [1] ;  [2]
  1. INFN-Laboratori Nazionali del Sud, via S. Sofia 62, 95123 Catania (Italy)
  2. (Italy)
  3. (Switzerland)
  4. (Spain)
Publication Date:
OSTI Identifier:
22314697
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 9; 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; DISTRIBUTION FUNCTIONS; ELECTRONS; ENERGY SPECTRA; HELIUM IONS; HIGH-FREQUENCY DISCHARGES; ION SOURCES; LIGHT IONS; MAGNETIC FIELDS; PLASMA WAVES; PROTON BEAMS; X RADIATION