The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation
Abstract
Large-radius internal transport barriers (ITB) are the signature of high βp scenarios on DIII-D. Previous studies show that a large Shafranov shift, rather the E x B shear, suppresses the turbulence and helps in the formation of the large-radius ITB. New gyrokinetic simulations suggest that the remaining micro-instabilities in lower q95 (<7.0), high βp ITB plasmas are drift wave instabilities, including the collisionless trapped electron mode in the core and ITB peak gradient region, the electron temperature gradient mode in the ITB peak gradient region and at the ITB foot and the ion temperature gradient mode at the ITB foot. Gyrokinetic simulation results qualitatively agree with the density fluctuation analysis from beam emission spectroscopy, which suggests the existence of a low-k ion mode at the ITB foot. As a result, the gyrokinetic simulations also predict that a larger Shafranov shift can overwhelm the driving sources for turbulence from the profile gradients at higher βN, leading to stronger turbulence suppression and stronger ITBs in lower q95, high βp plasmas.
- Authors:
-
- Oak Ridge Associated Univ., Oak Ridge, TN (United States); Chinese Academy of Sciences, Anhui (China)
- Univ. of California, San Diego, La Jolla, CA (United States)
- General Atomics, San Diego, CA (United States)
- Univ. of Wisconsin-Madison, Madison, WI (United States)
- Chinese Academy of Sciences, Anhui (China)
- Princeton Univ., Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1578050
- Grant/Contract Number:
- FC02-04ER54698; SC0010685; SC0018287
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 1; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high βp scenario; micro-turbulence instabilities; predict-first extrapolation
Citation Formats
Ding, S., Jian, X., Garofalo, A. M., Yan, Z., McClenaghan, J., Guo, W., and Grierson, B. A. The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab5152.
Ding, S., Jian, X., Garofalo, A. M., Yan, Z., McClenaghan, J., Guo, W., & Grierson, B. A. The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation. United States. doi:10.1088/1741-4326/ab5152.
Ding, S., Jian, X., Garofalo, A. M., Yan, Z., McClenaghan, J., Guo, W., and Grierson, B. A. Thu .
"The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation". United States. doi:10.1088/1741-4326/ab5152. https://www.osti.gov/servlets/purl/1578050.
@article{osti_1578050,
title = {The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation},
author = {Ding, S. and Jian, X. and Garofalo, A. M. and Yan, Z. and McClenaghan, J. and Guo, W. and Grierson, B. A.},
abstractNote = {Large-radius internal transport barriers (ITB) are the signature of high βp scenarios on DIII-D. Previous studies show that a large Shafranov shift, rather the E x B shear, suppresses the turbulence and helps in the formation of the large-radius ITB. New gyrokinetic simulations suggest that the remaining micro-instabilities in lower q95 (<7.0), high βp ITB plasmas are drift wave instabilities, including the collisionless trapped electron mode in the core and ITB peak gradient region, the electron temperature gradient mode in the ITB peak gradient region and at the ITB foot and the ion temperature gradient mode at the ITB foot. Gyrokinetic simulation results qualitatively agree with the density fluctuation analysis from beam emission spectroscopy, which suggests the existence of a low-k ion mode at the ITB foot. As a result, the gyrokinetic simulations also predict that a larger Shafranov shift can overwhelm the driving sources for turbulence from the profile gradients at higher βN, leading to stronger turbulence suppression and stronger ITBs in lower q95, high βp plasmas.},
doi = {10.1088/1741-4326/ab5152},
journal = {Nuclear Fusion},
number = 1,
volume = 60,
place = {United States},
year = {2019},
month = {11}
}
Works referenced in this record:
Stationary, high bootstrap fraction plasmas in DIII-D without inductive current control
journal, May 2005
- Politzer, P. A.; Hyatt, A. W.; Luce, T. C.
- Nuclear Fusion, Vol. 45, Issue 6
Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation
journal, August 2017
- McClenaghan, J.; Garofalo, A. M.; Meneghini, O.
- Nuclear Fusion, Vol. 57, Issue 11
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
An Eulerian gyrokinetic-Maxwell solver
journal, April 2003
- Candy, J.; Waltz, R. E.
- Journal of Computational Physics, Vol. 186, Issue 2
Toroidal microinstability studies of high‐temperature tokamaks
journal, January 1990
- Rewoldt, G.; Tang, W. M.
- Physics of Fluids B: Plasma Physics, Vol. 2, Issue 2
Shafranov shift bifurcation of turbulent transport in the high β p scenario on DIII-D
journal, September 2019
- McClenaghan, J.; Garofalo, A. M.; Staebler, G. M.
- Nuclear Fusion, Vol. 59, Issue 12
Quantitative predictions of tokamak energy confinement from first‐principles simulations with kinetic effects
journal, June 1995
- Kotschenreuther, M.; Dorland, W.; Beer, M. A.
- Physics of Plasmas, Vol. 2, Issue 6
Gyrokinetic simulation of collisionless trapped-electron mode turbulence
journal, July 2005
- Dannert, Tilman; Jenko, Frank
- Physics of Plasmas, Vol. 12, Issue 7
Confinement improvement in the high poloidal beta regime on DIII-D and application to steady-state H-mode on EAST
journal, May 2017
- Ding, S.; Garofalo, A. M.; Qian, J.
- Physics of Plasmas, Vol. 24, Issue 5
The first transport code simulations using the trapped gyro-Landau-fluid model
journal, May 2008
- Kinsey, J. E.; Staebler, G. M.; Waltz, R. E.
- Physics of Plasmas, Vol. 15, Issue 5
Theory of transport in high bootstrap fraction H-modes with internal transport barriers
journal, September 2018
- Staebler, Gary M.
- Nuclear Fusion, Vol. 58, Issue 11
Gyrofluid simulations of turbulence suppression in reversed-shear experiments on the Tokamak Fusion Test Reactor
journal, May 1997
- Beer, M. A.; Hammett, G. W.; Rewoldt, G.
- Physics of Plasmas, Vol. 4, Issue 5
Coupling of η i and trapped electron modes in plasmas with negative magnetic shear
journal, March 1997
- Dong, J. Q.; Mahajan, S. M.; Horton, W.
- Physics of Plasmas, Vol. 4, Issue 3
Critical gradient formula for toroidal electron temperature gradient modes
journal, September 2001
- Jenko, F.; Dorland, W.; Hammett, G. W.
- Physics of Plasmas, Vol. 8, Issue 9
A high-accuracy Eulerian gyrokinetic solver for collisional plasmas
journal, November 2016
- Candy, J.; Belli, E. A.; Bravenec, R. V.
- Journal of Computational Physics, Vol. 324
Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D
journal, November 2015
- Garofalo, A. M.; Gong, X.; Grierson, B. A.
- Nuclear Fusion, Vol. 55, Issue 12
Joint DIII-D/EAST research on the development of a high poloidal beta scenario for the steady state missions of ITER and CFETR
journal, November 2017
- Garofalo, A. M.; Gong, X. Z.; Ding, S. Y.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 1
An Empirical Approach to Tokamak Transport
book, January 1979
- Hawryluk, R. J.
- Physics of Plasmas Close to Thermonuclear Conditions, p. 19-46
Wide-field turbulence imaging with beam emission spectroscopy
journal, October 2010
- McKee, G. R.; Fonck, R. J.; Shafer, M. W.
- Review of Scientific Instruments, Vol. 81, Issue 10
Transport barriers in bootstrap-driven tokamaks
journal, May 2018
- Staebler, G. M.; Garofalo, A. M.; Pan, C.
- Physics of Plasmas, Vol. 25, Issue 5
Fusion Nuclear Science Facility Candidates
journal, February 2011
- Stambaugh, R. D.; Chan, V. S.; Garofalo, A. M.
- Fusion Science and Technology, Vol. 59, Issue 2
Full linearized Fokker–Planck collisions in neoclassical transport simulations
journal, December 2011
- Belli, E. A.; Candy, J.
- Plasma Physics and Controlled Fusion, Vol. 54, Issue 1
Progress toward steady-state tokamak operation exploiting the high bootstrap current fraction regime
journal, June 2016
- Ren, Q. L.; Garofalo, A. M.; Gong, X. Z.
- Physics of Plasmas, Vol. 23, Issue 6