Radial electric field and ion parallel flow in the quasi-symmetric and Mirror configurations of HSX
Abstract
In this paper, the radial electric field and the ion mean parallel flow are obtained in the helically symmetric experiment stellarator from toroidal flow measurements of C+6 ion at two locations on a flux surface, using the Pfirsch–Schlüter effect. Results from the standard quasi-helically symmetric magnetic configuration are compared with those from the Mirror configuration where the quasi-symmetry is deliberately degraded using auxiliary coils. For similar injected power, the quasi-symmetric configuration is observed to have significantly lower flows while the experimental observations from the Mirror geometry are in better agreement with neoclassical calculations. Finally, indications are that the radial electric field near the core of the quasi-symmetric configuration may be governed by non-neoclassical processes.
- Authors:
-
[1];
- Univ. of Wisconsin, Madison, WI (United States). HSX Plasma Lab. Dept. of Electrical and Computer Engineering
- Univ. of Wisconsin, Madison, WI (United States). HSX Plasma Lab. Dept. of Electrical and Computer Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1432157
- Grant/Contract Number:
- AC05-00OR22725; FG02-93ER54222
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 5; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Kumar, S. T. A., Dobbins, T. J., Talmadge, J. N., Wilcox, R. S., and Anderson, D. T. Radial electric field and ion parallel flow in the quasi-symmetric and Mirror configurations of HSX. United States: N. p., 2018.
Web. doi:10.1088/1361-6587/aab4c7.
Kumar, S. T. A., Dobbins, T. J., Talmadge, J. N., Wilcox, R. S., & Anderson, D. T. Radial electric field and ion parallel flow in the quasi-symmetric and Mirror configurations of HSX. United States. doi:10.1088/1361-6587/aab4c7.
Kumar, S. T. A., Dobbins, T. J., Talmadge, J. N., Wilcox, R. S., and Anderson, D. T. Wed .
"Radial electric field and ion parallel flow in the quasi-symmetric and Mirror configurations of HSX". United States. doi:10.1088/1361-6587/aab4c7. https://www.osti.gov/servlets/purl/1432157.
@article{osti_1432157,
title = {Radial electric field and ion parallel flow in the quasi-symmetric and Mirror configurations of HSX},
author = {Kumar, S. T. A. and Dobbins, T. J. and Talmadge, J. N. and Wilcox, R. S. and Anderson, D. T.},
abstractNote = {In this paper, the radial electric field and the ion mean parallel flow are obtained in the helically symmetric experiment stellarator from toroidal flow measurements of C+6 ion at two locations on a flux surface, using the Pfirsch–Schlüter effect. Results from the standard quasi-helically symmetric magnetic configuration are compared with those from the Mirror configuration where the quasi-symmetry is deliberately degraded using auxiliary coils. For similar injected power, the quasi-symmetric configuration is observed to have significantly lower flows while the experimental observations from the Mirror geometry are in better agreement with neoclassical calculations. Finally, indications are that the radial electric field near the core of the quasi-symmetric configuration may be governed by non-neoclassical processes.},
doi = {10.1088/1361-6587/aab4c7},
journal = {Plasma Physics and Controlled Fusion},
number = 5,
volume = 60,
place = {United States},
year = {2018},
month = {3}
}
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Figures / Tables:
Figure 1: (a) Poloidal cross-section of HSX magnetic flux surfaces where the flow measurements are made. Vertical shaded band represents approximate 1/e width of the diagnostic hydrogen neutral beam. Red and green dots represent inboard and outboard measurement locations respectively. (b) The Pfirsch-Schlüter factor, h, calculated at the measurement locationsmore »
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Works referenced in this record:
Role of Neoclassical Transport and Radial Electric Field in LHD Plasmas
journal, August 2010
- Yokoyama, M.; Wakasa, A.; Murakami, S.
- Fusion Science and Technology, Vol. 58, Issue 1
Internal electron transport barrier due to neoclassical ambipolarity in the Helically Symmetric Experiment
journal, May 2010
- Lore, J.; Guttenfelder, W.; Briesemeister, A.
- Physics of Plasmas, Vol. 17, Issue 5
Neoclassical modeling of the radial electric field and comparison with measurements in the TJ-II stellarator
journal, March 2015
- Gutiérrez-Tapia, C.; Martinell, J. J.; López-Bruna, D.
- Journal of Physics: Conference Series, Vol. 591
Experimental Demonstration of Improved Neoclassical Transport with Quasihelical Symmetry
journal, February 2007
- Canik, J. M.; Anderson, D. T.; Anderson, F. S. B.
- Physical Review Letters, Vol. 98, Issue 8
Comparison of the flows and radial electric field in the HSX stellarator to neoclassical calculations
journal, December 2012
- Briesemeister, A.; Zhai, K.; Anderson, D. T.
- Plasma Physics and Controlled Fusion, Vol. 55, Issue 1
Measurement and calculation of the radial electric field in the stellarator W7-AS
journal, June 1998
- Baldzuhn, J.; Kick, M.; Maassberg, H.
- Plasma Physics and Controlled Fusion, Vol. 40, Issue 6
Overview of Recent Results from HSX
journal, August 2006
- Anderson, D. T.; Abdou, A.; Almagri, A. F.
- Fusion Science and Technology, Vol. 50, Issue 2
Generation and damping of neoclassical plasma flows in stellarators
journal, May 2005
- Spong, D. A.
- Physics of Plasmas, Vol. 12, Issue 5
Intrinsic Ambipolarity and Rotation in Stellarators
journal, September 2008
- Helander, P.; Simakov, A. N.
- Physical Review Letters, Vol. 101, Issue 14
Measurements and modeling of plasma flow damping in the Helically Symmetric eXperiment
journal, May 2005
- Gerhardt, S. P.; Talmadge, J. N.; Canik, J. M.
- Physics of Plasmas, Vol. 12, Issue 5
Stellarators close to quasisymmetry
journal, November 2013
- Calvo, Iván; Parra, Felix I.; Velasco, José Luis
- Plasma Physics and Controlled Fusion, Vol. 55, Issue 12
Evaluation of 1/ν neoclassical transport in stellarators
journal, December 1999
- Nemov, V. V.; Kasilov, S. V.; Kernbichler, W.
- Physics of Plasmas, Vol. 6, Issue 12
A synthetic diagnostic for beam emission spectroscopy in the helically symmetric experiment stellarator
journal, August 2016
- Dobbins, T. J.; Kumar, S. T. A.; Anderson, D. T.
- Review of Scientific Instruments, Vol. 87, Issue 11
Role of Neoclassical Transport and Radial Electric Field in LHD Plasmas
journal, August 2010
- Yokoyama, M.; Wakasa, A.; Murakami, S.
- Fusion Science and Technology, Vol. 58, Issue 1
Intrinsic Ambipolarity and Rotation in Stellarators
journal, September 2008
- Helander, P.; Simakov, A. N.
- Physical Review Letters, Vol. 101, Issue 14
Overview of Recent Results from HSX
journal, August 2006
- Anderson, D. T.; Abdou, A.; Almagri, A. F.
- Fusion Science and Technology, Vol. 50, Issue 2
Experimental Demonstration of Improved Neoclassical Transport with Quasihelical Symmetry
journal, February 2007
- Canik, J. M.; Anderson, D. T.; Anderson, F. S. B.
- Physical Review Letters, Vol. 98, Issue 8
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.