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Title: Angular distribution of energetic argon ions emitted by a 90 kJ Filippov-type plasma focus

Characteristics of the energetic argon ions emitted by a 90 kJ Filippov-type plasma focus are studied by employing an array of Faraday cups. The Faraday cups are designed to minimize the secondary electron emission effects on their response. Angular distribution of the ions is measured, and the results indicate a highly anisotropic emission with a dip at the device axis and a local maximum at the angle of 7° with respect to the axis. It has been argued that this kind of anisotropic emission may be related to the surfatron acceleration mechanism and shown that this behavior is independent of the working gas pressure. It has been also demonstrated that this mechanism is responsible for the generation of MeV ions. Measuring the total ion number at different working gas pressures gives an optimum pressure of 0.3 Torr. In addition, the energy spectrum of ions is measured by taking into account of the ambient gas effects on the energy and charge of the ions. The current neutralization effect of electrons trapped in the ion beam as well as the effect of conducting boundaries surrounding the beam, on the detected signals are investigated.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Postal Code 5167618949, Tabriz (Iran, Islamic Republic of)
  2. (Iran, Islamic Republic of)
  3. Department of Physics, Faculty of Science, Azarbaijan Shahid Madani University, 53714-161 Tabriz (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22408128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 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; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANGULAR DISTRIBUTION; ANISOTROPY; ARGON IONS; ELECTRON EMISSION; ENERGY SPECTRA; FARADAY CUPS; ION BEAMS; MEV RANGE; PLASMA FOCUS; SIGNALS; TRAPPED ELECTRONS