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

Abstract

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]
  1. National Research Center “Kurchatov Institute”, 123182 Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22306219
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
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

Citation Formats

Savrukhin, P. V., E-mail: p.savrukhin@iterrf.ru, ITER RF Domestic Agency, Institution Project Center ITER” 123182 Moscow, Ermolaeva, A. I., Shestakov, E. A., and Khramenkov, A. V. Tomographic analysis of the nonthermal x-ray bursts during disruption instability in the T-10 tokamak. United States: N. p., 2014. Web. doi:10.1063/1.4898333.
Savrukhin, P. V., E-mail: p.savrukhin@iterrf.ru, ITER RF Domestic Agency, Institution Project Center ITER” 123182 Moscow, Ermolaeva, A. I., Shestakov, E. A., & Khramenkov, A. V. Tomographic analysis of the nonthermal x-ray bursts during disruption instability in the T-10 tokamak. United States. https://doi.org/10.1063/1.4898333
Savrukhin, P. V., E-mail: p.savrukhin@iterrf.ru, ITER RF Domestic Agency, Institution Project Center ITER” 123182 Moscow, Ermolaeva, A. I., Shestakov, E. A., and Khramenkov, A. V. 2014. "Tomographic analysis of the nonthermal x-ray bursts during disruption instability in the T-10 tokamak". United States. https://doi.org/10.1063/1.4898333.
@article{osti_22306219,
title = {Tomographic analysis of the nonthermal x-ray bursts during disruption instability in the T-10 tokamak},
author = {Savrukhin, P. V., E-mail: p.savrukhin@iterrf.ru and ITER RF Domestic Agency, Institution Project Center ITER” 123182 Moscow and Ermolaeva, A. I. and Shestakov, E. A. and Khramenkov, A. V.},
abstractNote = {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.},
doi = {10.1063/1.4898333},
url = {https://www.osti.gov/biblio/22306219}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 85,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 2014},
month = {Wed Oct 01 00:00:00 EDT 2014}
}