Upgrade of the neutral particle analyzers for the TJ-II stellarator

The TJ-II stellarator, a magnetically confined plasma device, is equipped with a broad range of diagnostics for plasma characterization. These include 4 neutral particle analyzers (NPAs), consisting of two Acord-12's, to perform poloidal measurements, plus a compact NPA, and an Acord-24, these...

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Veröffentlicht in:Review of scientific instruments 2014-11, Vol.85 (11), p.11E803-11E803
Hauptverfasser: Fontdecaba, J M, Petrov, S Ya, Nesenevich, V G, Ros, A, Chernyshev, F V, McCarthy, K J, Barcala, J M
Format: Artikel
Sprache:eng
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Zusammenfassung:The TJ-II stellarator, a magnetically confined plasma device, is equipped with a broad range of diagnostics for plasma characterization. These include 4 neutral particle analyzers (NPAs), consisting of two Acord-12's, to perform poloidal measurements, plus a compact NPA, and an Acord-24, these in tangential viewing positions. The Acord-12's were originally equipped with two rows of 6 channels each, one for hydrogen neutrals and the other for deuterium neutrals but were changed to a single row of 12 detectors for hydrogen, the principal working gas in TJ-II. With this upgrade the resultant improved energy resolution spectrum has allowed more reliable ion temperature estimates to be obtained. Here we present the upgrades undertaken and present results to demonstrate the improved performance of this diagnostic.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4886434