4.5 Article Proceedings Paper

Time-resolved x-ray and extreme ultraviolate spectrometer for use on the National Spherical Torus Experiment

Journal

REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 79, Issue 10, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.2953488

Keywords

boron; carbon; nitrogen; oxygen; plasma diagnostics; plasma impurities; plasma toroidal confinement; time resolved spectroscopy; Tokamak devices; ultraviolet spectrometers; X-ray spectrometers

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We describe upgrades to a compact grazing-incidence spectrometer utilized on the National Spherical Torus Experiment for monitoring light and heavy impurities. A fast-readout charge couple device camera has been implemented that allows the recording of spectra with up to 25 ms time integration. This capability is used to study the time evolution of the K-shell emission of hydrogenlike and heliumlike boron, carbon, nitrogen, and oxygen between 10 and 65 A. Different camera positioning pieces have been employed to extend the possible spectral range to as high as 140. Several lines that cannot be ascribed to the usual elements found in the plasma have been observed in this spectral range, although often only in a few isolated discharges.

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