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

Journal Article · Wed Oct 01 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4898333· OSTI ID:22306219

Ermolaeva, A. I.; Shestakov, E. A.; Khramenkov, A. V. ^[1]

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1. National Research Center “Kurchatov Institute”, 123182 Moscow (Russian Federation)

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.

• OSTI ID: 22306219
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Publisher: Optical Society of America
• Country of Publication: United States
• Language: English

Related Subjects

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