NDLI: X-ray tomography on IR-T1 tokamak

Content Provider	IEEE Xplore Digital Library
Author	Ghoranneviss, M. Masnavi, M. Khademian, A. Tafreshi, A.R.K.
Copyright Year	1996
Description	Author affiliation: Plasma Phys. Res. Center, Tehran, Iran (Ghoranneviss, M.)
Abstract	Summary form only given, as follows. Measurements of soft X-ray emission from the IR-T1 tokamak plasma have been analysed with tomographic reconstruction methods. IR-T1 is a small air core transformer tokamak with circular cross-section and without copper shell and divertor (R=45 cm, a=12.5 cm, Bt<1 T, Ip=20-40, Ne=(0.7-2.5)/spl times/10/sup 1/3 cm/sup -/3, Te=150-200 eV). The detector system is on a circular are view IR-T1 tokamak plasmas through a thin beryllium window (in a fashion similar to that of a pin-hole camera), to provide poloidal imaging of soft X-ray emission (SXR) in the 600 eV-20 keV range. Each detector has an active area 3/spl times/20 mm/sup 2/. The signals are digitized every 4 /spl mu/s or 8 /spl mu/s by use of 8 bit transient recorders and the frequency response of detector-preamplifier system is from 10 Hz-200 kHz. The tomography method (Cormack's method) is used for reconstructing the images of SXR emissivity distribution in the poloidal cross-section of IR-T1 tokamak. X-ray imaging (XIS) diagnostics of the sawtooth oscillation have tended to emphasize the coincidence between magnetic surfaces and the contours of equal X-ray emissivity. Because there is a detector array, one-dimensional images of SXR emissivity are obtained without having to resort to rotation models. This method has been used to study the internal disruptions and m=1 oscillation. The reconstructed images in the phase before a sawtooth crash have shown the hot plasma core move gradually toward one side, this is considered that as the increasing m=1 kink mode.
File Size	106058
File Format	PDF
ISBN	0780333225
ISSN	07309244
DOI	10.1109/PLASMA.1996.550256
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	X-ray tomography Tokamaks Plasma x-ray sources X-ray imaging Plasma measurements Detectors Image reconstruction Reconstruction algorithms Transformer cores Copper
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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