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

Abstract

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, asmore » sulphur x-ray emission lines are regularly observed in both tokamak and stellarator plasmas.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [1];  [1];  [1];  [1];  [1];  [1]
  1. CIEMAT, Madrid (Spain)
  2. National Institute for Fusion Science, Toki (Japan)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
The TJ-II Team
OSTI Identifier:
1465047
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physica Scripta
Additional Journal Information:
Journal Volume: 93; Journal Issue: 3; Journal ID: ISSN 0031-8949
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma; sulphur; vacuum ultraviolet; stellarator

Citation Formats

McCarthy, Kieran J., Tamura, N., Combs, Stephen Kirk, Garcia, R., Hernandez Sanchez, J., Navarro, M., Panadero, N., Pastor, I., and Soleto, A.. Identification of S VIII through S XIV emission lines between 17.5 and 50 nm in a magnetically confined plasma. United States: N. p., 2018. Web. https://doi.org/10.1088/1402-4896/aaa22c.
McCarthy, Kieran J., Tamura, N., Combs, Stephen Kirk, Garcia, R., Hernandez Sanchez, J., Navarro, M., Panadero, N., Pastor, I., & Soleto, A.. Identification of S VIII through S XIV emission lines between 17.5 and 50 nm in a magnetically confined plasma. United States. https://doi.org/10.1088/1402-4896/aaa22c
McCarthy, Kieran J., Tamura, N., Combs, Stephen Kirk, Garcia, R., Hernandez Sanchez, J., Navarro, M., Panadero, N., Pastor, I., and Soleto, A.. Mon . "Identification of S VIII through S XIV emission lines between 17.5 and 50 nm in a magnetically confined plasma". United States. https://doi.org/10.1088/1402-4896/aaa22c. https://www.osti.gov/servlets/purl/1465047.
@article{osti_1465047,
title = {Identification of S VIII through S XIV emission lines between 17.5 and 50 nm in a magnetically confined plasma},
author = {McCarthy, Kieran J. and Tamura, N. and Combs, Stephen Kirk and Garcia, R. and Hernandez Sanchez, J. and Navarro, M. and Panadero, N. and Pastor, I. and Soleto, A.},
abstractNote = {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.},
doi = {10.1088/1402-4896/aaa22c},
journal = {Physica Scripta},
number = 3,
volume = 93,
place = {United States},
year = {2018},
month = {1}
}

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Figures / Tables:

Figure 1 Figure 1: Electron temperature (continuous) and density (dashed) profiles of the target plasmas used in this study. These were obtained using the Thomson Scattering Diagnostic which is limited to measurements within ρ ≤ 0.7.

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    Works referencing / citing this record:

    Plasma termination by excess pellet fueling and impurity injection in TJ-II, the Large Helical Device and Wendelstein 7-X
    journal, May 2019


    Overview of recent TJ-II stellarator results
    journal, July 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.