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Title: Study of impurity behaviour for first magnetic configuration changes in W7-X plasmas by means of PHA spectra

Abstract

Transport properties of impurities in stellarators are sensitive to potential variations on flux-surfaces, and thermodynamic forces from the bulk plasma which might be affected by changes in magnetic field properties. In this contribution, the effect of planar coil current changes on the core impurity behavior in the first operating phase of Wendelstein 7-X (W7-X) is described. Hydrogen plasmas, at different heating power levels were investigated showing Core-Electron-Root-Confinement (CERC) conditions, characterized by peaked Te profiles and positive radial electric fields in the plasma core. Additionally, impurity spectra in the x-ray emission range between 1 and 10 keV were measured by the Pulse Height Analysis (PHA) diagnostic. The line-integrated measurements of transitions in sulphur, chlorine and argon are in the focus of this analysis. First observations indicate that the scans of the magnetic configuration did not affect strongly the impurity concentration in the core. Clear differences in the impurity content, however, have been observed when the ECRH power was changed, which affects the bulk plasma properties.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [2]
  1. Inst. of Plasma Physics and Laser Microfusion, Warsaw (Poland)
  2. Max Planck Inst. for Plasma Physics, Greifswald (Germany)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; EUROfusion Consortium; Polish Ministry of Science and Higher Education
Contributing Org.:
[W7-X Team]
OSTI Identifier:
1598040
Grant/Contract Number:  
[AC02-09CH11466; 633053]
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
[ Journal Volume: 136; Journal Issue: PB]; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Plasma impurities; Stellarator; Soft X-ray plasma diagnostic; Pulse height analysis

Citation Formats

Czarnecka, Agata, Fornal, Tomasz, Gruca, Marta, Krawczyk, Natalia, Kubkowska, Monika, Jabłoński, Sławomir, Ryć, Leszek, Andreeva, Tamara, Alonso, Arturo, Burhenn, Rainer, Buttenschön, Birger, Dinklage, Andreas, Jakubowski, Marcin, Krychowiak, Maciej, König, Ralph, Pablant, Novimir, Thomsen, Henning, and Zhang, Daihong. Study of impurity behaviour for first magnetic configuration changes in W7-X plasmas by means of PHA spectra. United States: N. p., 2018. Web. doi:10.1016/j.fusengdes.2018.04.119.
Czarnecka, Agata, Fornal, Tomasz, Gruca, Marta, Krawczyk, Natalia, Kubkowska, Monika, Jabłoński, Sławomir, Ryć, Leszek, Andreeva, Tamara, Alonso, Arturo, Burhenn, Rainer, Buttenschön, Birger, Dinklage, Andreas, Jakubowski, Marcin, Krychowiak, Maciej, König, Ralph, Pablant, Novimir, Thomsen, Henning, & Zhang, Daihong. Study of impurity behaviour for first magnetic configuration changes in W7-X plasmas by means of PHA spectra. United States. doi:10.1016/j.fusengdes.2018.04.119.
Czarnecka, Agata, Fornal, Tomasz, Gruca, Marta, Krawczyk, Natalia, Kubkowska, Monika, Jabłoński, Sławomir, Ryć, Leszek, Andreeva, Tamara, Alonso, Arturo, Burhenn, Rainer, Buttenschön, Birger, Dinklage, Andreas, Jakubowski, Marcin, Krychowiak, Maciej, König, Ralph, Pablant, Novimir, Thomsen, Henning, and Zhang, Daihong. Tue . "Study of impurity behaviour for first magnetic configuration changes in W7-X plasmas by means of PHA spectra". United States. doi:10.1016/j.fusengdes.2018.04.119. https://www.osti.gov/servlets/purl/1598040.
@article{osti_1598040,
title = {Study of impurity behaviour for first magnetic configuration changes in W7-X plasmas by means of PHA spectra},
author = {Czarnecka, Agata and Fornal, Tomasz and Gruca, Marta and Krawczyk, Natalia and Kubkowska, Monika and Jabłoński, Sławomir and Ryć, Leszek and Andreeva, Tamara and Alonso, Arturo and Burhenn, Rainer and Buttenschön, Birger and Dinklage, Andreas and Jakubowski, Marcin and Krychowiak, Maciej and König, Ralph and Pablant, Novimir and Thomsen, Henning and Zhang, Daihong},
abstractNote = {Transport properties of impurities in stellarators are sensitive to potential variations on flux-surfaces, and thermodynamic forces from the bulk plasma which might be affected by changes in magnetic field properties. In this contribution, the effect of planar coil current changes on the core impurity behavior in the first operating phase of Wendelstein 7-X (W7-X) is described. Hydrogen plasmas, at different heating power levels were investigated showing Core-Electron-Root-Confinement (CERC) conditions, characterized by peaked Te profiles and positive radial electric fields in the plasma core. Additionally, impurity spectra in the x-ray emission range between 1 and 10 keV were measured by the Pulse Height Analysis (PHA) diagnostic. The line-integrated measurements of transitions in sulphur, chlorine and argon are in the focus of this analysis. First observations indicate that the scans of the magnetic configuration did not affect strongly the impurity concentration in the core. Clear differences in the impurity content, however, have been observed when the ECRH power was changed, which affects the bulk plasma properties.},
doi = {10.1016/j.fusengdes.2018.04.119},
journal = {Fusion Engineering and Design},
number = [PB],
volume = [136],
place = {United States},
year = {2018},
month = {5}
}

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