Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak
Abstract
Neoclassical Tearing Modes (NTMs) often lead to the decrease of plasma performance and can lead to disruptions, which makes them a major impediment in the development of operating scenarios in present toroidal fusion devices. Recent gyrokinetic simulations predict a decrease of plasma turbulence and cross- eld transport at the O-point of the islands, which in turn affects the NTM dynamics. In this paper a heat transport model of magnetic islands employing spatially non-uniform cross-field thermal diffusivity (χ$$\perp$$) is presented. This model is used to derive χ$$\perp$$ at the O-point from electron temperature data measured across 2/1 NTM islands in DIII-D. It was found that χ$$\perp$$ at the O-point is 1 to 2 orders of magnitude smaller than the background plasma transport, in qualitative agreement with gyrokinetic predictions. As the anomalously large values of χ$$\perp$$ are often attributed to turbulence driven transport, the reduction of the O-point χ$$\perp$$ is consistent with turbulence reduction found in recent experiments. Lastly, the implication of reduced χ$$\perp$$ at the O-point on NTM dynamics was investigated using the modi ed Rutherford equation that predicts a significant effect of reduced χ$$\perp$$ at the O-point on NTM saturation.
- Authors:
-
[1];
- Univ. of California, Los Angeles, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1354786
- Alternate Identifier(s):
- OSTI ID: 1252264
- Grant/Contract Number:
- FC02-04ER54698; FG02-08ER54984; FG03-86ER53266
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ntm; tearing; magnetic; island; mhd; transport; turbulence; modeling; experiment; tokamak
Citation Formats
Bardóczi, Laszlo, Rhodes, Terry L., Carter, Troy A., Crocker, Neal A., Peebles, William A., and Grierson, Brian A. Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak. United States: N. p., 2016.
Web. doi:10.1063/1.4948560.
Bardóczi, Laszlo, Rhodes, Terry L., Carter, Troy A., Crocker, Neal A., Peebles, William A., & Grierson, Brian A. Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak. United States. https://doi.org/10.1063/1.4948560
Bardóczi, Laszlo, Rhodes, Terry L., Carter, Troy A., Crocker, Neal A., Peebles, William A., and Grierson, Brian A. Mon .
"Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak". United States. https://doi.org/10.1063/1.4948560. https://www.osti.gov/servlets/purl/1354786.
@article{osti_1354786,
title = {Non-perturbative measurement of cross-field thermal diffusivity reduction at the O-point of 2/1 neoclassical tearing mode islands in the DIII-D tokamak},
author = {Bardóczi, Laszlo and Rhodes, Terry L. and Carter, Troy A. and Crocker, Neal A. and Peebles, William A. and Grierson, Brian A.},
abstractNote = {Neoclassical Tearing Modes (NTMs) often lead to the decrease of plasma performance and can lead to disruptions, which makes them a major impediment in the development of operating scenarios in present toroidal fusion devices. Recent gyrokinetic simulations predict a decrease of plasma turbulence and cross- eld transport at the O-point of the islands, which in turn affects the NTM dynamics. In this paper a heat transport model of magnetic islands employing spatially non-uniform cross-field thermal diffusivity (χ$\perp$) is presented. This model is used to derive χ$\perp$ at the O-point from electron temperature data measured across 2/1 NTM islands in DIII-D. It was found that χ$\perp$ at the O-point is 1 to 2 orders of magnitude smaller than the background plasma transport, in qualitative agreement with gyrokinetic predictions. As the anomalously large values of χ$\perp$ are often attributed to turbulence driven transport, the reduction of the O-point χ$\perp$ is consistent with turbulence reduction found in recent experiments. Lastly, the implication of reduced χ$\perp$ at the O-point on NTM dynamics was investigated using the modi ed Rutherford equation that predicts a significant effect of reduced χ$\perp$ at the O-point on NTM saturation.},
doi = {10.1063/1.4948560},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {Mon May 09 00:00:00 EDT 2016},
month = {Mon May 09 00:00:00 EDT 2016}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 40 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:
Determination of the heat diffusion anisotropy by comparing measured and simulated electron temperature profiles across magnetic islands
journal, September 2009
- Hölzl, M.; Günter, S.; Classen, I. G. J.
- Nuclear Fusion, Vol. 49, Issue 11
Spatiotemporal changes in the pressure-driven current densities on DIII-D due to magnetic islands
journal, December 2011
- Petty, C. C.; Jayakumar, R. J.; Makowski, M. A.
- Nuclear Fusion, Vol. 52, Issue 1
Electron cyclotron emission radiometer upgrade on the DIII-D tokamak
journal, March 2003
- Austin, M. E.; Lohr, J.
- Review of Scientific Instruments, Vol. 74, Issue 3
Helical temperature perturbations associated with tearing modes in tokamak plasmas
journal, March 1995
- Fitzpatrick, Richard
- Physics of Plasmas, Vol. 2, Issue 3
Plasma flows and fluctuations with magnetic islands in the edge plasmas of J-TEXT tokamak
journal, June 2015
- Zhao, K. J.; Shi, Y. J.; Hahn, S. H.
- Nuclear Fusion, Vol. 55, Issue 7
The nonlinear coupling between gyroradius scale turbulence and mesoscale magnetic islands in fusion plasmas
journal, September 2010
- Hornsby, W. A.; Peeters, A. G.; Snodin, A. P.
- Physics of Plasmas, Vol. 17, Issue 9
Improved accuracy in the estimation of the tearing mode stability parameters (Δ′ and w c ) using 2D ECEI data in KSTAR
journal, June 2014
- Choi, Minjun J.; Yun, Gunsu S.; Lee, Woochang
- Nuclear Fusion, Vol. 54, Issue 8
Improved charge-coupled device detectors for high-speed, charge exchange spectroscopy studies on the DIII-D tokamak
journal, October 2004
- Burrell, K. H.; Gohil, P.; Groebner, R. J.
- Review of Scientific Instruments, Vol. 75, Issue 10
Interaction of turbulence with magnetic islands: effect on bootstrap current
journal, April 2011
- Hornsby, W. A.; Siccinio, M.; Peeters, A. G.
- Plasma Physics and Controlled Fusion, Vol. 53, Issue 5
Comparison of Pseudospectral and Spectral Approximation
journal, September 1972
- Orszag, Steven A.
- Studies in Applied Mathematics, Vol. 51, Issue 3
Beta limit due to m / n = 2/1 tearing mode onset in the DIII-D hybrid scenario
journal, January 2008
- La Haye, R. J.; Politzer, P. A.; Brennan, D. P.
- Nuclear Fusion, Vol. 48, Issue 1
Phase-locking of magnetic islands diagnosed by ECE-imaging
journal, November 2014
- Tobias, B.; Grierson, B. A.; Muscatello, C. M.
- Review of Scientific Instruments, Vol. 85, Issue 11
Fiber optic two-color vibration compensated interferometer for plasma density measurements
journal, October 2006
- Van Zeeland, M. A.; Boivin, R. L.; Carlstrom, T. N.
- Review of Scientific Instruments, Vol. 77, Issue 10
Heat pulse propagation studies around magnetic islands induced by the Dynamic Ergodic Divertor in TEXTOR
journal, September 2008
- Spakman, G. W.; Hogeweij, G. M. D.; Jaspers, R. J. E.
- Nuclear Fusion, Vol. 48, Issue 11
The role of asymmetries in the growth and suppression of neoclassical tearing modes
journal, February 2011
- De Lazzari, D.; Westerhof, E.
- Plasma Physics and Controlled Fusion, Vol. 53, Issue 3
A design retrospective of the DIII-D tokamak
journal, May 2002
- Luxon, J. L.
- Nuclear Fusion, Vol. 42, Issue 5
The bootstrap current and its consequences
journal, December 2000
- Peeters, A. G.
- Plasma Physics and Controlled Fusion, Vol. 42, Issue 12B
Control of neoclassical tearing modes in DIII–D
journal, May 2002
- La Haye, R. J.; Günter, S.; Humphreys, D. A.
- Physics of Plasmas, Vol. 9, Issue 5
The influence of finite radial transport on the structure and evolution of m / n = 2/1 neoclassical tearing modes on MAST
journal, May 2012
- Snape, J. A.; Gibson, K. J.; O'Gorman, T.
- Plasma Physics and Controlled Fusion, Vol. 54, Issue 8
Millimeter-wave backscatter diagnostic for the study of short scale length plasma fluctuations (invited)
journal, October 2006
- Rhodes, T. L.; Peebles, W. A.; Nguyen, X.
- Review of Scientific Instruments, Vol. 77, Issue 10
Analysis of the structure of neoclassical tearing modes in ASDEX Upgrade
journal, September 2001
- Meskat, J. P.; Zohm, H.; Gantenbein, G.
- Plasma Physics and Controlled Fusion, Vol. 43, Issue 10
The influence of magnetic islands on drift mode stability in magnetized plasma
journal, October 2009
- Wilson, H. R.; Connor, J. W.
- Plasma Physics and Controlled Fusion, Vol. 51, Issue 11
Island bootstrap current modification of the nonlinear dynamics of the tearing mode
journal, January 1986
- Carrera, R.; Hazeltine, R. D.; Kotschenreuther, M.
- Physics of Fluids, Vol. 29, Issue 4
Measuring Δ′ from electron temperature fluctuations in the Tokamak Fusion Test Reactor
journal, February 1998
- Ren, C.; Callen, J. D.; Gianakon, T. A.
- Physics of Plasmas, Vol. 5, Issue 2
Neoclassical tearing modes
journal, December 2000
- Buttery, R. J.; Günter, S.; Giruzzi, G.
- Plasma Physics and Controlled Fusion, Vol. 42, Issue 12B
Testing instabilities and microturbulence in TEXT
journal, September 1992
- Yu, C.; Brower, D. L.; Zhao, S.
- Nuclear Fusion, Vol. 32, Issue 9
Modulation of Core Turbulent Density Fluctuations by Large-Scale Neoclassical Tearing Mode Islands in the DIII-D Tokamak
journal, May 2016
- Bardóczi, L.; Rhodes, T. L.; Carter, T. A.
- Physical Review Letters, Vol. 116, Issue 21
An Empirical Approach to Tokamak Transport
book, January 1979
- Hawryluk, R. J.
- Physics of Plasmas Close to Thermonuclear Conditions, p. 19-46
Observation of Reduced Heat Transport inside the Magnetic Island O Point in the Large Helical Device
journal, February 2004
- Inagaki, S.; Tamura, N.; Ida, K.
- Physical Review Letters, Vol. 92, Issue 5
Reduction of Ion Thermal Diffusivity Inside a Magnetic Island in JT-60U Tokamak Plasma
journal, August 2012
- Ida, K.; Kamiya, K.; Isayama, A.
- Physical Review Letters, Vol. 109, Issue 6
Works referencing / citing this record:
Effect of magnetic islands on profiles, flows, turbulence and transport in nonlinear gyrokinetic simulations
journal, February 2017
- Navarro, A. Bañón; Bardóczi, L.; Carter, T. A.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 3
Controlled neoclassical tearing mode (NTM) healing by fueling pellets and its impact on electron cyclotron current drive requirements for complete NTM stabilization
journal, October 2019
- Bardóczi, L.; Choi, M. J.; Bañón Navarro, A.
- Nuclear Fusion, Vol. 59, Issue 12
Quantitative modeling of neoclassical tearing mode driven fast ion transport in integrated TRANSP simulations
journal, April 2019
- Bardóczi, L.; Podestà, M.; Heidbrink, W. W.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 5
Upgrade of the ECE diagnostic on EAST
journal, October 2018
- Zhao, Hailin; Zhou, Tianfu; Liu, Yong
- Review of Scientific Instruments, Vol. 89, Issue 10
Influence of m / n = 2/1 magnetic islands on perpendicular flows and turbulence in HL-2A Ohmic plasmas
journal, December 2017
- Jiang, M.; Zhong, W. L.; Xu, Y.
- Nuclear Fusion, Vol. 58, Issue 2
Multi-field/-scale interactions of turbulence with neoclassical tearing mode magnetic islands in the DIII-D tokamak
journal, May 2017
- Bardóczi, L.; Rhodes, T. L.; Bañón Navarro, A.
- Physics of Plasmas, Vol. 24, Issue 5
The phase-space dependence of fast-ion interaction with tearing modes
journal, July 2018
- Heidbrink, W. W.; Bardoczi, L.; Collins, C. S.
- Nuclear Fusion, Vol. 58, Issue 8
Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations
journal, August 2019
- Podestà, M.; Bardóczi, L.; Collins, C. S.
- Nuclear Fusion, Vol. 59, Issue 10
Impact of neoclassical tearing mode–turbulence multi-scale interaction in global confinement degradation and magnetic island stability
journal, December 2017
- Bardóczi, L.; Carter, T. A.; La Haye, R. J.
- Physics of Plasmas, Vol. 24, Issue 12
Influence of resonant magnetic perturbations and induced islands on plasma rotations and turbulence properties in the J-TEXT tokamak
journal, January 2019
- Jiang, M.; Xu, Y.; Zhong, W. L.
- Nuclear Fusion, Vol. 59, Issue 4
Gyrokinetic simulations of nonlinear interactions between magnetic islands and microturbulence
journal, September 2019
- Fang, Kaisheng; Bao, Jian; Lin, Zhihong
- Plasma Science and Technology, Vol. 21, Issue 11
Internal transport barrier in tokamak and helical plasmas
journal, January 2018
- Ida, K.; Fujita, T.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 3
Electron thermal confinement in a partially stochastic magnetic structure
journal, April 2018
- Morton, L. A.; Young, W. C.; Hegna, C. C.
- Physics of Plasmas, Vol. 25, Issue 4
A neoclassical drift-magnetohydrodynamical fluid model of the interaction of a magnetic island chain with a resonant error-field in a high temperature tokamak plasma
journal, April 2018
- Fitzpatrick, Richard
- Physics of Plasmas, Vol. 25, Issue 4
Interaction of magnetic islands with turbulent electron temperature fluctuations in DIII-D and in GENE nonlinear gyrokinetic simulations
journal, December 2019
- Bardóczi, L.; Sung, C.; Navarro, A. Bañón
- Plasma Physics and Controlled Fusion, Vol. 62, Issue 2