Theory of transport in high bootstrap fraction H-modes with internal transport barriers

Staebler, Gary M.

doi:10.1088/1741-4326/aac4b7

Title: Theory of transport in high bootstrap fraction H-modes with internal transport barriers

Journal Article · Thu Sep 27 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aac4b7· OSTI ID:1543947

Staebler, Gary M.

A review of the recent progress in understanding the transport in fully non-inductive, high bootstrap fraction H-mode discharges, developed on the DIII-D tokamak, is given in this paper. Experiments have demonstrated improved energy confinement due to the formation of an internal transport barrier in high bootstrap fraction H-mode discharges. Gyrokinetic analysis, and quasi-linear predictive modeling, demonstrates that the observed transport barrier is due to the suppression of turbulence, primarily due to the large Shafranov shift. E×B velocity shear does not play a significant role in the transport barrier due to the high safety factor. The ion energy transport is reduced to neoclassical for DIII-D discharges and electron energy and particle transport is reduced, but still turbulent, within the barrier. Deeper into the plasma, high levels of electron transport are observed. The electron energy transport in DIII-D is found to be due to electromagnetically enhanced electron scale modes. A contribution from fast ion driven instabilities is also possible. The kinetic ballooning mode plays a strong role in the region between the internal and H-mode edge transport barriers with two types of self-organized pedestal states observed.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FC02-04ER54698; FG02-95ER54309

OSTI ID:: 1543947

Journal Information:: Nuclear Fusion, Vol. 58, Issue 11; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

References (21)

Synergism between cross-section and profile shaping in beta optimization of tokamak equilibria with negative central shear Turnbull, A. D.; Taylor, T. S.; Chu, M. S. Nuclear Fusion, Vol. 38, Issue 10 https://doi.org/10.1088/0029-5515/38/10/305	journal	October 1998
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
Trapped gyro-Landau-fluid transport modeling of DIII-D hybrid discharges Kinsey, J. E.; Staebler, G. M.; Petty, C. C. Physics of Plasmas, Vol. 17, Issue 12 https://doi.org/10.1063/1.3523058	journal	December 2010
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
Chapter 2: Plasma confinement and transport Transport, ITER Physics Expert Group on Confin; Database, ITER Physics Expert Group on Confin; Editors, ITER Physics Basis Nuclear Fusion, Vol. 39, Issue 12 https://doi.org/10.1088/0029-5515/39/12/302	journal	December 1999
The role of zonal flows in the saturation of multi-scale gyrokinetic turbulence Staebler, G. M.; Candy, J.; Howard, N. T. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4954905	journal	June 2016
Bootstrap current in a tokamak Kessel, C. E. Nuclear Fusion, Vol. 34, Issue 9 https://doi.org/10.1088/0029-5515/34/9/I04	journal	September 1994
Kinetic calculation of neoclassical transport including self-consistent electron and impurity dynamics Belli, E. A.; Candy, J. Plasma Physics and Controlled Fusion, Vol. 50, Issue 9 https://doi.org/10.1088/0741-3335/50/9/095010	journal	July 2008
Stabilizing impact of high gradient of β on microturbulence Bourdelle, C.; Dorland, W.; Garbet, X. Physics of Plasmas, Vol. 10, Issue 7 https://doi.org/10.1063/1.1585032	journal	July 2003
Alfvén eigenmode stability and critical gradient energetic particle transport using the Trapped-Gyro-Landau-Fluid model Sheng, He; Waltz, R. E.; Staebler, G. M. Physics of Plasmas, Vol. 24, Issue 7 https://doi.org/10.1063/1.4989716	journal	July 2017
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
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
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
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
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
Gyrokinetic simulation of global and local Alfvén eigenmodes driven by energetic particles in a DIII-D discharge Bass, E. M.; Waltz, R. E. Physics of Plasmas, Vol. 20, Issue 1 https://doi.org/10.1063/1.4773177	journal	January 2013
Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST Garofalo, A. M.; Gong, X. Z.; Qian, J. Nuclear Fusion, Vol. 57, Issue 7 https://doi.org/10.1088/1741-4326/aa7186	journal	June 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
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
Shear, Periodicity, and Plasma Ballooning Modes Connor, J. W.; Hastie, R. J.; Taylor, J. B. Physical Review Letters, Vol. 40, Issue 6 https://doi.org/10.1103/PhysRevLett.40.396	journal	February 1978
Gyro-Landau fluid equations for trapped and passing particles Staebler, G. M.; Kinsey, J. E.; Waltz, R. E. Physics of Plasmas, Vol. 12, Issue 10 https://doi.org/10.1063/1.2044587	journal	October 2005

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The dominant micro-turbulence instabilities in the lower q ₉₅ high β _p plasmas on DIII-D and predict-first extrapolation Ding, S.; Jian, X.; Garofalo, A. M. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab5152	journal	November 2019
Persistence of Ion Temperature Gradient Turbulent Transport at Finite Normalized Pressure Ishizawa, A.; Urano, D.; Nakamura, Y. Physical Review Letters, Vol. 123, Issue 2 https://doi.org/10.1103/physrevlett.123.025003	journal	July 2019

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