U.S. Department of EnergyOffice of Scientific and Technical Information
Impact of plasma response on plasma displacements in DIII-D during application of external 3D perturbations
Abstract
The effects of applied 3D resonant magnetic perturbations are modelled with and without self-consistent plasma response. The plasma response is calculated using a linear two-fluid model. A synthetic diagnostic is used to simulate soft x-ray (SXR) emission within the steep gradient region of the pedestal, 0.98 > > 0.94. Two methods for simulating the SXR emission given the perturbed fields are considered. In the first method, the emission is assumed to be constant on magnetic field lines, with the emission on each line determined by the penetration depth into the plasma. In the second method, the emission is taken to be a function of the perturbed electron temperature and density calculated by the two-fluid model. It is shown that the latter method is more accurate within the plasma, but is inadequate in the scrape-off layer due to the breakdown of the linearized temperature equation in the two-fluid model. The resulting synthetic emission is compared to measured SXR data, which show helical m = 11 1 displacements around the 11/3 rational surface of sizes up to 5 cm, depending on the poloidal angle. The helical displacements around the 11/3 surface are identified to be directly related to the kink response, causedmore »
- Authors:
-
- ORNL
- General Atomics, San Diego
- Oak Ridge National Laboratory (ORNL)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1154868
- DOE Contract Number:
- DE-AC05-00OR22725
- Resource Type:
- Journal Article
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 6; Journal ID: ISSN 0029-5515
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Wingen, Andreas, Ferraro, N. M., Shafer, M. W., Unterberg, Ezekial A, Evans, T. E., Hillis, Donald Lee, and Snyder, P. B. Impact of plasma response on plasma displacements in DIII-D during application of external 3D perturbations. United States: N. p., 2014.
Web. doi:10.1088/0029-5515/54/6/064007.
Wingen, Andreas, Ferraro, N. M., Shafer, M. W., Unterberg, Ezekial A, Evans, T. E., Hillis, Donald Lee, & Snyder, P. B. Impact of plasma response on plasma displacements in DIII-D during application of external 3D perturbations. United States. https://doi.org/10.1088/0029-5515/54/6/064007
Wingen, Andreas, Ferraro, N. M., Shafer, M. W., Unterberg, Ezekial A, Evans, T. E., Hillis, Donald Lee, and Snyder, P. B. 2014.
"Impact of plasma response on plasma displacements in DIII-D during application of external 3D perturbations". United States. https://doi.org/10.1088/0029-5515/54/6/064007.
@article{osti_1154868,
title = {Impact of plasma response on plasma displacements in DIII-D during application of external 3D perturbations},
author = {Wingen, Andreas and Ferraro, N. M. and Shafer, M. W. and Unterberg, Ezekial A and Evans, T. E. and Hillis, Donald Lee and Snyder, P. B.},
abstractNote = {The effects of applied 3D resonant magnetic perturbations are modelled with and without self-consistent plasma response. The plasma response is calculated using a linear two-fluid model. A synthetic diagnostic is used to simulate soft x-ray (SXR) emission within the steep gradient region of the pedestal, 0.98 > > 0.94. Two methods for simulating the SXR emission given the perturbed fields are considered. In the first method, the emission is assumed to be constant on magnetic field lines, with the emission on each line determined by the penetration depth into the plasma. In the second method, the emission is taken to be a function of the perturbed electron temperature and density calculated by the two-fluid model. It is shown that the latter method is more accurate within the plasma, but is inadequate in the scrape-off layer due to the breakdown of the linearized temperature equation in the two-fluid model. The resulting synthetic emission is compared to measured SXR data, which show helical m = 11 1 displacements around the 11/3 rational surface of sizes up to 5 cm, depending on the poloidal angle. The helical displacements around the 11/3 surface are identified to be directly related to the kink response, caused by amplification of non-resonant components of the magnetic field due to plasma response. The role of different plasma parameters is investigated, but it appears that the electron rotation plays a key role in the formation of screening and resonant amplification, while the kinking appears to be sensitive to the edge current density. It is also hypothesized that the plasma response affects the edge-localized-mode (ELM) stability, i.e. the discharge s operational point relative to the peeling ballooning stability boundary.},
doi = {10.1088/0029-5515/54/6/064007},
url = {https://www.osti.gov/biblio/1154868},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 6,
volume = 54,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2014},
month = {Wed Jan 01 00:00:00 EST 2014}
}
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Works referenced in this record:
Importance of plasma response to nonaxisymmetric perturbations in tokamaks
journal, May 2009
- Park, Jong-kyu; Boozer, Allen H.; Menard, Jonathan E.
- Physics of Plasmas, Vol. 16, Issue 5
Observation of Lobes near the Point in Resonant Magnetic Perturbation Experiments on MAST
journal, June 2012
- Kirk, A.; Harrison, J.; Liu, Yueqiang
- Physical Review Letters, Vol. 108, Issue 25
Experimental signatures of homoclinic tangles in poloidally diverted tokamaks
journal, January 2005
- Evans, T. E.; Roeder, R. K. W.; Carter, J. A.
- Journal of Physics: Conference Series, Vol. 7
Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
journal, June 2004
- Evans, T. E.; Moyer, R. A.; Thomas, P. R.
- Physical Review Letters, Vol. 92, Issue 23
Active Control of Type-I Edge-Localized Modes with Perturbation Fields in the JET Tokamak
journal, June 2007
- Liang, Y.; Koslowski, H. R.; Thomas, P. R.
- Physical Review Letters, Vol. 98, Issue 26
First Observation of Edge Localized Modes Mitigation with Resonant and Nonresonant Magnetic Perturbations in ASDEX Upgrade
journal, June 2011
- Suttrop, W.; Eich, T.; Fuchs, J. C.
- Physical Review Letters, Vol. 106, Issue 22
Validation of the linear ideal magnetohydrodynamic model of three-dimensional tokamak equilibria
journal, March 2010
- Lanctot, M. J.; Reimerdes, H.; Garofalo, A. M.
- Physics of Plasmas, Vol. 17, Issue 3
Observation of Plasma Rotation Driven by Static Nonaxisymmetric Magnetic Fields in a Tokamak
journal, November 2008
- Garofalo, A. M.; Burrell, K. H.; DeBoo, J. C.
- Physical Review Letters, Vol. 101, Issue 19
Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
journal, May 2012
- Ferraro, N. M.
- Physics of Plasmas, Vol. 19, Issue 5
Islands in the stream: The effect of plasma flow on tearing stability
journal, May 2010
- La Haye, R. J.; Brennan, D. P.; Buttery, R. J.
- Physics of Plasmas, Vol. 17, Issue 5
2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region
journal, October 2010
- Shafer, M. W.; Battaglia, D. J.; Unterberg, E. A.
- Review of Scientific Instruments, Vol. 81, Issue 10
Experimental imaging of separatrix splitting on DIII-D
journal, November 2012
- Shafer, M. W.; Unterberg, E. A.; Orlov, D. M.
- Nuclear Fusion, Vol. 52, Issue 12
High resolution numerical studies of separatrix splitting due to non-axisymmetric perturbation in DIII-D
journal, April 2009
- Wingen, A.; Evans, T. E.; Spatschek, K. H.
- Nuclear Fusion, Vol. 49, Issue 5
Chianti—An Atomic Database for Emission Lines. xii. Version 7 of the Database
journal, December 2011
- Landi, E.; Del Zanna, G.; Young, P. R.
- The Astrophysical Journal, Vol. 744, Issue 2
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
Analysis of toroidal phasing of resonant magnetic perturbation effects on edge transport in the DIII-D tokamak
journal, May 2013
- Wilks, T. M.; Stacey, W. M.; Evans, T. E.
- Physics of Plasmas, Vol. 20, Issue 5
High speed tangential soft x-ray camera for the study of magnetohydrodynamics instabilities
journal, January 1999
- von Goeler, S.; Kaita, R.; Bitter, M.
- Review of Scientific Instruments, Vol. 70, Issue 1
Study of in-vessel nonaxisymmetric ELM suppression coil concepts for ITER
journal, January 2008
- Schaffer, M. J.; Menard, J. E.; Aldan, M. P.
- Nuclear Fusion, Vol. 48, Issue 2
Interaction of tearing modes with external structures in cylindrical geometry (plasma)
journal, July 1993
- Fitzpatrick, R.
- Nuclear Fusion, Vol. 33, Issue 7
Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes
journal, May 2002
- Snyder, P. B.; Wilson, H. R.; Ferron, J. R.
- Physics of Plasmas, Vol. 9, Issue 5
Pedestal stability comparison and ITER pedestal prediction
journal, July 2009
- Snyder, P. B.; Aiba, N.; Beurskens, M.
- Nuclear Fusion, Vol. 49, Issue 8
Works referencing / citing this record:
Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D
journal, January 2015
- Wade, M. R.; Nazikian, R.; deGrassie, J. S.
- Nuclear Fusion, Vol. 55, Issue 2
Equilibrium drives of the low and high field side n = 2 plasma response and impact on global confinement
journal, April 2016
- Paz-Soldan, C.; Logan, N. C.; Haskey, S. R.
- Nuclear Fusion, Vol. 56, Issue 5
Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations
journal, November 2018
- Willensdorfer, M.; Cote, T. B.; Griener, M.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
Assessment of equilibrium field coil misalignments on the divertor footprints in NSTX-U
journal, June 2019
- Munaretto, S.; Evans, T. E.; Ferraro, N. M.
- Nuclear Fusion, Vol. 59, Issue 7
Optimizing multi-modal, non-axisymmetric plasma response metrics with additional coil rows on DIII-D
journal, July 2019
- Weisberg, D. B.; Paz-Soldan, C.; Liu, Y. Q.
- Nuclear Fusion, Vol. 59, Issue 8
Divertor currents during type-I edge-localized modes on the DIII-D tokamak
journal, October 2019
- Knolker, M.; Evans, T. E.; Wingen, A.
- Nuclear Fusion, Vol. 59, Issue 12
Nonlinear modeling of the effect of n = 2 resonant magnetic field perturbation on peeling-ballooning modes in KSTAR
journal, January 2020
- Kim, S. K.; Pamela, S.; Kwon, O.
- Nuclear Fusion, Vol. 60, Issue 2
Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
journal, March 2015
- Paz-Soldan, C.; Nazikian, R.; Haskey, S. R.
- Physical Review Letters, Vol. 114, Issue 10