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Title: Tomographic analysis of the nonthermal x-ray bursts during disruption instability in the T-10 tokamak

Non-thermal x-ray radiation (E{sub γ} up to 150 keV) is measured in the T-10 tokamaks during disruption instability using two sets of CdTe detectors (10 vertical and 7 horizontal view detectors). Special narrow cupper tubes collimators with lead screening and CdTe detectors integrated with amplifiers inside metallic containers provides enhanced spatial resolution of the system (r ~ 3 cm) and assures protection from the parasitic hard x-ray (E{sub γ} up to 1.5 MeV) and electromagnetic loads during disruption. Spatial localization of the nonthermal x-ray emissivity is reconstructed using tomographic Cormack technique with SVD matrix inversion. Analysis indicated appearance of an intensive non-thermal x-ray bursts during initial stage of the disruptions at high density. The bursts are characterized by repetitive spikes (2–3 kHz) of the x-ray emissivity from the plasma core area. Analysis indicated that the spikes can be connected with acceleration of the non-thermal electrons in enhanced longitudinal electric fields induced during energy quench at the disruption instability.
Authors:
 [1] ;  [2] ; ; ;  [1]
  1. National Research Center “Kurchatov Institute”, 123182 Moscow (Russian Federation)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
22306219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; AMPLIFIERS; CDTE SEMICONDUCTOR DETECTORS; COLLIMATORS; ELECTRIC FIELDS; ELECTRONS; EMISSIVITY; HARD X RADIATION; INSTABILITY; KEV RANGE; KHZ RANGE; MEV RANGE; SPATIAL RESOLUTION; T-10 TOKAMAK; TOMOGRAPHY