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:
-
[1];
[1];
- 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}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 3 works
Citation information provided by
Web of Science
Web of Science
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
Measurements of the internal magnetic field using the B-Stark motional Stark effect diagnostic on DIII-D (invited)
journal, October 2010
- Pablant, N. A.; Burrell, K. H.; Groebner, R. J.
- Review of Scientific Instruments, Vol. 81, Issue 10
Motional Stark Effect measurements of the local magnetic field in high temperature fusion plasmas
journal, October 2015
- Wolf, R. C.; Bock, A.; Ford, O. P.
- Journal of Instrumentation, Vol. 10, Issue 10
Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985
- Lao, L. L.; St. John, H.; Stambaugh, R. D.
- Nuclear Fusion, Vol. 25, Issue 11
Equilibrium analysis of current profiles in tokamaks
journal, June 1990
- Lao, L. L.; Ferron, J. R.; Groebner, R. J.
- Nuclear Fusion, Vol. 30, Issue 6
MHD Equilibrium Reconstruction in the DIII-D Tokamak
journal, October 2005
- Lao, L. L.; John, H. E. St.; Peng, Q.
- Fusion Science and Technology, Vol. 48, Issue 2
Active beam spectroscopy diagnostics for ITER: Present status (invited)
journal, October 2004
- Malaquias, A.; von Hellermann, M.; Tugarinov, S.
- Review of Scientific Instruments, Vol. 75, Issue 10
Reconstruction of the q and p profiles in ITER from external and internal measurements
journal, March 2008
- Zakharov, L. E.; Foley, E. L.; Levinton, F. M.
- Plasma Physics Reports, Vol. 34, Issue 3
Active spectroscopic measurements of the bulk deuterium properties in the DIII-D tokamak (invited)
journal, October 2012
- Grierson, B. A.; Burrell, K. H.; Chrystal, C.
- Review of Scientific Instruments, Vol. 83, Issue 10
Motional Stark effect upgrades on DIII‐D
journal, January 1995
- Rice, B. W.; Nilson, D. G.; Wróblewski, D.
- Review of Scientific Instruments, Vol. 66, Issue 1
Overview of equilibrium reconstruction on DIII-D using new measurements from an expanded motional Stark effect diagnostic
journal, October 2008
- Holcomb, C. T.; Makowski, M. A.; Allen, S. L.
- Review of Scientific Instruments, Vol. 79, Issue 10
Comparison of motional Stark effect diagnostic approaches for equilibrium reconstruction
journal, July 2008
- Foley, E. L.; Levinton, F. M.; Yuh, H. Y.
- Nuclear Fusion, Vol. 48, Issue 8
Motional Stark effect polarimetry for a current profile diagnostic in DIII‐D
journal, November 1990
- Wróblewski, D.; Burrell, K. H.; Lao, L. L.
- Review of Scientific Instruments, Vol. 61, Issue 11