Using motional Stark splitting of D$$_α$$ emission to constrain MHD equilibrium analysis in DIII-D plasmas
Abstract
Herein we report tests of an alternate technique for constraining MHD equilibrium analysis in tokamak plasmas using internal magnetic field measurements based on |$$B$$| measurements from the motional Stark splitting of D$$_α$$ spectral lines emitted by a neutral heating beam (MSE-LS). We compare results using MSE-LS with those of the standard equilibrium analysis technique based on line polarization of the D$$_α$$ emission (MSE-LP). An alternative to MSE-LP is needed in future devices such as ITER where MSE-LP will be difficult due to a plasma-induced coating of the first optical element. The tests utilized data from 10 DIII-D shots with 7 MSE-LS and 14 MSE-LP views covering a range of radii along the outer midplane of the plasma. Seven MSE-LS measurements can contribute significantly to the equilibrium reconstruction of pressure and q profiles using both synthetic and experimental DIII-D MSE-LS data. For example, 7 MSE-LS plus seven MSE-LP measurements give a fit quality that is as good as the same cases with 14 MSE-LP measurements. Analyzing synthetic data for 14 MSE-LS measurements shows significant improvement in fitting quality over the case with 7 MSE-LS locations.
- Authors:
-
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1609189
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 89; Journal Issue: 10; Conference: 22.Topical Conference on High Temperature Plasma Diagnostics, San Diego, CA (United States), 16-19 Apr 2018; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Instruments & instrumentation; Physics; Plasma confinement; Electric currents; Stark effect; Tokamaks; Magnetohydrodynamics; Optical elements; Magnetic equipment
Citation Formats
Burrell, K. H., Lao, L. L., and Grierson, B. A. Using motional Stark splitting of D$_α$ emission to constrain MHD equilibrium analysis in DIII-D plasmas. United States: N. p., 2018.
Web. doi:10.1063/1.5037701.
Burrell, K. H., Lao, L. L., & Grierson, B. A. Using motional Stark splitting of D$_α$ emission to constrain MHD equilibrium analysis in DIII-D plasmas. United States. https://doi.org/10.1063/1.5037701
Burrell, K. H., Lao, L. L., and Grierson, B. A. Mon .
"Using motional Stark splitting of D$_α$ emission to constrain MHD equilibrium analysis in DIII-D plasmas". United States. https://doi.org/10.1063/1.5037701. https://www.osti.gov/servlets/purl/1609189.
@article{osti_1609189,
title = {Using motional Stark splitting of D$_α$ emission to constrain MHD equilibrium analysis in DIII-D plasmas},
author = {Burrell, K. H. and Lao, L. L. and Grierson, B. A.},
abstractNote = {Herein we report tests of an alternate technique for constraining MHD equilibrium analysis in tokamak plasmas using internal magnetic field measurements based on |$B$| measurements from the motional Stark splitting of D$_α$ spectral lines emitted by a neutral heating beam (MSE-LS). We compare results using MSE-LS with those of the standard equilibrium analysis technique based on line polarization of the D$_α$ emission (MSE-LP). An alternative to MSE-LP is needed in future devices such as ITER where MSE-LP will be difficult due to a plasma-induced coating of the first optical element. The tests utilized data from 10 DIII-D shots with 7 MSE-LS and 14 MSE-LP views covering a range of radii along the outer midplane of the plasma. Seven MSE-LS measurements can contribute significantly to the equilibrium reconstruction of pressure and q profiles using both synthetic and experimental DIII-D MSE-LS data. For example, 7 MSE-LS plus seven MSE-LP measurements give a fit quality that is as good as the same cases with 14 MSE-LP measurements. Analyzing synthetic data for 14 MSE-LS measurements shows significant improvement in fitting quality over the case with 7 MSE-LS locations.},
doi = {10.1063/1.5037701},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Mon Aug 20 00:00:00 EDT 2018},
month = {Mon Aug 20 00:00:00 EDT 2018}
}
Web of Science
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