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Title: Upgrade of the neutral particle analyzers for the TJ-II stellarator

The TJ-II stellarator, a magnetically confined plasma device, is equipped with a broad range of diagnostics for plasma characterization. These include 4 neutral particle analyzers (NPAs), consisting of two Acord-12's, to perform poloidal measurements, plus a compact NPA, and an Acord-24, these in tangential viewing positions. The Acord-12's were originally equipped with two rows of 6 channels each, one for hydrogen neutrals and the other for deuterium neutrals but were changed to a single row of 12 detectors for hydrogen, the principal working gas in TJ-II. With this upgrade the resultant improved energy resolution spectrum has allowed more reliable ion temperature estimates to be obtained. Here we present the upgrades undertaken and present results to demonstrate the improved performance of this diagnostic.
Authors:
; ;  [1] ; ; ;  [2] ;  [3]
  1. Laboratorio Nacional de Fusión, CIEMAT, Madrid 28040 (Spain)
  2. Ioffe Physical-Technical Institute, Saint Petersburg 194024 (Russian Federation)
  3. Departamento de Electrónica, CIEMAT, Madrid 28040 (Spain)
Publication Date:
OSTI Identifier:
22308997
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; 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; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEUTERIUM; ENERGY RESOLUTION; HYDROGEN; ION TEMPERATURE; NEUTRAL PARTICLE ANALYZERS; PERFORMANCE; PLASMA; PLASMA CONFINEMENT; SPECTRA; STELLARATORS