Initial operation of the national spherical torus experiment fast tangential soft x-ray camera

Fast, two-dimensional, soft x-ray imaging is a powerful technique for the study of magnetohydrodynamic instabilities in tokamak plasmas. We have constructed an ultra-fast frame rate soft x-ray camera for the national spherical torus experiment (NSTX). It is based on a recently developed 64×64 pixel...

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Bibliographic Details
Published in:Review of Scientific Instruments 2004-10, Vol.75 (10), p.3959-3961
Main Authors: Stratton, B. C., Feder, R., Goeler, S. von, Renda, G. F., Mastrocola, V. J., Lowrance, J. L.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
APERTURES
BERYLLIUM
CHARGE-COUPLED DEVICES
EMISSION
IMAGE INTENSIFIERS
KEV RANGE 01-10
MAGNETOHYDRODYNAMICS
NSTX DEVICE
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
SCINTILLATIONS
SOFT X RADIATION
SPHERICAL CONFIGURATION
X-RAY RADIOGRAPHY
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Summary:Fast, two-dimensional, soft x-ray imaging is a powerful technique for the study of magnetohydrodynamic instabilities in tokamak plasmas. We have constructed an ultra-fast frame rate soft x-ray camera for the national spherical torus experiment (NSTX). It is based on a recently developed 64×64 pixel charge-coupled device (CCD) camera capable of capturing 300 frames at up to 500 000 frames per second. A pinhole aperture images the plasma soft x-ray emission (0.2–10  keV ) onto a P 47 scintillator deposited on a fiber-optic faceplate; the scintillator visible light output is detected and amplified by a demagnifying image intensifier and lens-coupled to the CCD chip. A selection of beryllium foils provides discrimination of low-energy emission. The system is installed on NSTX with a wide-angle tangential view of the plasma. Initial plasma data and an assessment of the system performance are presented.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1787930