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Title: First experimental results on the IShTAR testbed

IShTAR (Ion cyclotron Sheath Test ARrangement) is a linear magnetized plasma test facility dedicated to the investigation of RF wave/plasma interaction [1] in the Ion Cyclotron Range of Frequencies (ICRF). It provides a better accessibility for the instrumentation than tokamaks while being representative of the neighboring region of the wave emitter. It is equipped with a magnetized plasma source (1 m long, 0.4 m diameter) powered by a helical antenna up to 3 kW at 11 MHz. We present the results of the first analysis of the plasma characteristics (plasma density, electron temperature) in function of the operating parameters (injected power, neutral pressure and magnetic field) as measured with fixed and movable Langmuir probes, spectrometer and cameras. The plasma is presently produced only by the helical antenna (no ICRF). We show that the plasma exists in three regime depending on the power level: the first two ones are stable and separated by a jump in density; a first spatial profile of the plasma density has been established for these modes; The third mode is unstable, characterized by strong oscillations of the plasma tube position.
Authors:
; ; ; ; ;  [1] ; ; ;  [2] ; ; ; ;  [3] ;  [1] ;  [4]
  1. Max-Planck-Institut für Plasmaphysik, Garching (Germany)
  2. LPP-ERM-KMS, TEC partner, Brussels (Belgium)
  3. Institut Jean Lamour UMR 7198 CNRS-Université de Lorraine, Nancy (France)
  4. (Belgium)
Publication Date:
OSTI Identifier:
22496201
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1689; Journal Issue: 1; Conference: 21. topical conference on radio frequency power in plasmas, Lake Arrowhead, CA (United States), 27-29 Apr 2015; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTENNAS; CAMERAS; ELECTRON TEMPERATURE; ICR HEATING; ION CYCLOTRON-RESONANCE; LANGMUIR PROBE; MAGNETIC FIELDS; MHZ RANGE 01-100; PLASMA DENSITY; SPECTROMETERS; TEST FACILITIES; TOKAMAK DEVICES; TUBES