The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation

Ding, S.; Jian, X.; Garofalo, A. M.; Yan, Z.; McClenaghan, J.; Guo, W.; Grierson, B. A.

doi:10.1088/1741-4326/ab5152

The dominant micro-turbulence instabilities in the lower q₉₅ high β_p plasmas on DIII-D and predict-first extrapolation

Journal Article · Thu Nov 14 00:00:00 EST 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab5152· OSTI ID:1578050

^[1]; Jian, X. ^[2]; ^[3]; Yan, Z. ^[4]; McClenaghan, J. ^[3]; ^[5]; Grierson, B. A. ^[6]

Oak Ridge Associated Univ., Oak Ridge, TN (United States); Chinese Academy of Sciences, Anhui (China); General Atomics, Energy & Advanced Concepts, DIII-D
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)

Large-radius internal transport barriers (ITB) are the signature of high β_p 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 β_p 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 β_N, leading to stronger turbulence suppression and stronger ITBs in lower q₉₅, high β_p plasmas.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-04ER54698; SC0010685; SC0018287

OSTI ID:: 1578050

Alternate ID(s):: OSTI ID: 23013489

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (24)

An Empirical Approach to Tokamak Transport Hawryluk, R. J. Physics of Plasmas Close to Thermonuclear Conditions, p. 19-46 https://doi.org/10.1016/B978-1-4832-8385-2.50009-1	book	January 1979
An Eulerian gyrokinetic-Maxwell solver Candy, J.; Waltz, R. E. Journal of Computational Physics, Vol. 186, Issue 2 https://doi.org/10.1016/S0021-9991(03)00079-2	journal	April 2003
A high-accuracy Eulerian gyrokinetic solver for collisional plasmas Candy, J.; Belli, E. A.; Bravenec, R. V. Journal of Computational Physics, Vol. 324 https://doi.org/10.1016/j.jcp.2016.07.039	journal	November 2016
Integration of full divertor detachment with improved core confinement for tokamak fusion plasmas Wang, L.; Wang, H. Q.; Ding, S. Nature Communications, Vol. 12, Issue 1 https://doi.org/10.1038/s41467-021-21645-y	journal	March 2021
Critical gradient formula for toroidal electron temperature gradient modes Jenko, F.; Dorland, W.; Hammett, G. W. Physics of Plasmas, Vol. 8, Issue 9 https://doi.org/10.1063/1.1391261	journal	September 2001
Gyrokinetic simulation of collisionless trapped-electron mode turbulence Dannert, Tilman; Jenko, Frank Physics of Plasmas, Vol. 12, Issue 7 https://doi.org/10.1063/1.1947447	journal	July 2005
The first transport code simulations using the trapped gyro-Landau-fluid model Kinsey, J. E.; Staebler, G. M.; Waltz, R. E. Physics of Plasmas, Vol. 15, Issue 5 https://doi.org/10.1063/1.2889008	journal	May 2008
Wide-field turbulence imaging with beam emission spectroscopy McKee, G. R.; Fonck, R. J.; Shafer, M. W. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3495788	journal	October 2010
Progress toward steady-state tokamak operation exploiting the high bootstrap current fraction regime Ren, Q. L.; Garofalo, A. M.; Gong, X. Z. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4948724	journal	June 2016
Confinement improvement in the high poloidal beta regime on DIII-D and application to steady-state H-mode on EAST Ding, S.; Garofalo, A. M.; Qian, J. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4982058	journal	May 2017
Transport barriers in bootstrap-driven tokamaks Staebler, G. M.; Garofalo, A. M.; Pan, C. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5019282	journal	May 2018
Toroidal microinstability studies of high‐temperature tokamaks Rewoldt, G.; Tang, W. M. Physics of Fluids B: Plasma Physics, Vol. 2, Issue 2 https://doi.org/10.1063/1.859320	journal	January 1990
Quantitative predictions of tokamak energy confinement from first‐principles simulations with kinetic effects Kotschenreuther, M.; Dorland, W.; Beer, M. A. Physics of Plasmas, Vol. 2, Issue 6 https://doi.org/10.1063/1.871261	journal	June 1995
Coupling of η _i and trapped electron modes in plasmas with negative magnetic shear Dong, J. Q.; Mahajan, S. M.; Horton, W. Physics of Plasmas, Vol. 4, Issue 3 https://doi.org/10.1063/1.872169	journal	March 1997
Gyrofluid simulations of turbulence suppression in reversed-shear experiments on the Tokamak Fusion Test Reactor Beer, M. A.; Hammett, G. W.; Rewoldt, G. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872279	journal	May 1997
Reconstruction of current profile parameters and plasma shapes in tokamaks Lao, L. L.; St. John, H.; Stambaugh, R. D. Nuclear Fusion, Vol. 25, Issue 11 https://doi.org/10.1088/0029-5515/25/11/007	journal	November 1985
Stationary, high bootstrap fraction plasmas in DIII-D without inductive current control Politzer, P. A.; Hyatt, A. W.; Luce, T. C. Nuclear Fusion, Vol. 45, Issue 6 https://doi.org/10.1088/0029-5515/45/6/002	journal	May 2005
Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D Garofalo, A. M.; Gong, X.; Grierson, B. A. Nuclear Fusion, Vol. 55, Issue 12 https://doi.org/10.1088/0029-5515/55/12/123025	journal	November 2015
Full linearized Fokker–Planck collisions in neoclassical transport simulations Belli, E. A.; Candy, J. Plasma Physics and Controlled Fusion, Vol. 54, Issue 1 https://doi.org/10.1088/0741-3335/54/1/015015	journal	December 2011
Joint DIII-D/EAST research on the development of a high poloidal beta scenario for the steady state missions of ITER and CFETR Garofalo, A. M.; Gong, X. Z.; Ding, S. Y. Plasma Physics and Controlled Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1361-6587/aa8c9d	journal	November 2017
Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation McClenaghan, J.; Garofalo, A. M.; Meneghini, O. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa79ca	journal	August 2017
Theory of transport in high bootstrap fraction H-modes with internal transport barriers Staebler, Gary M. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aac4b7	journal	September 2018
Shafranov shift bifurcation of turbulent transport in the high β _p scenario on DIII-D McClenaghan, J.; Garofalo, A. M.; Staebler, G. M. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4086	journal	September 2019
Fusion Nuclear Science Facility Candidates Stambaugh, R. D.; Chan, V. S.; Garofalo, A. M. Fusion Science and Technology, Vol. 59, Issue 2 https://doi.org/10.13182/FST59-279	journal	February 2011

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The dominant micro-turbulence instabilities in the lower q95 high βp plasmas on DIII-D and predict-first extrapolation

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The dominant micro-turbulence instabilities in the lower q₉₅ high β_p plasmas on DIII-D and predict-first extrapolation