Identification of S VIII through S XIV emission lines between 17.5 and 50 nm in a magnetically confined plasma

McCarthy, Kieran J.; Tamura, N.; Combs, Stephen Kirk; Garcia, R.; Hernandez Sanchez, J.; Navarro, M.; Panadero, N.; Pastor, I.; Soleto, A.

doi:10.1088/1402-4896/aaa22c

Title: Identification of S VIII through S XIV emission lines between 17.5 and 50 nm in a magnetically confined plasma

Journal Article · 29 January 2018 · Physica Scripta

DOI: https://doi.org/10.1088/1402-4896/aaa22c · OSTI ID:1465047

McCarthy, Kieran J. ^[1]; Tamura, N. ^[2];

^[3]; Garcia, R. ^[1]; Hernandez Sanchez, J. ^[1]; Navarro, M. ^[1]; Panadero, N. ^[1]; Pastor, I. ^[1]; Soleto, A. ^[1]

CIEMAT, Madrid (Spain)
National Institute for Fusion Science, Toki (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

43 spectral emission lines from F-like to Li-like sulphur ions have been identified in the wavelength range from 17.5 to 50 nm in spectra obtained following tracer injection into plasmas created in a magnetically confined plasma device, the stellarator TJ-II. Plasmas created and maintained in this heliac device with electron cyclotron resonance heating achieve central electron temperatures and densities up to 1.5 keV and 8 × 10¹⁸ m^–3, respectively. Tracer injections were performed with ≤6 × 10¹⁶ atoms of sulphur contained within ~300 μm diameter polystyrene capsules, termed tracer encapsulated solid pellets, using a gas propulsion system to achieve velocities between 250 and 450 m s^–1. Once ablation of the exterior polystyrene shell by plasma particles is completed, the sulphur is deposited in the plasma core where it is ionized up to S⁺¹³ and transported about the plasma. In order to aid line identification, which is made using a number of atomic line emission databases, spectra are collected before and after injection using a 1 m focal length normal incidence spectrometer equipped with a CCD camera. Furthermore, this work is motivated by the need to clearly identify sulphur emission lines in the vacuum ultraviolet range of magnetically confined plasmas, as sulphur x-ray emission lines are regularly observed in both tokamak and stellarator plasmas.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: The TJ-II Team

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1465047

Journal Information:: Physica Scripta, Vol. 93, Issue 3; ISSN 0031-8949

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Overview of recent TJ-II stellarator results Ascasíbar, E.; Alba, D.; Alegre, D. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab205e	journal	July 2019
Overview of recent TJ-II stellarator results Ascasíbar, Enrique; Alba, D.; Alegre, Daniel ETH Zurich https://doi.org/10.3929/ethz-b-000385899	text	January 2019