The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D

Ding, S.; Garofalo, Andrea M.; Jian, X.; Holland, C.; Grierson, B. A.; Solomon, W. M.; Marinoni, A.; Knolker, M.; McClenaghan, J.

doi:10.1063/5.0061786

The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D

Journal Article · Thu Nov 04 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0061786· OSTI ID:1828879

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Oak Ridge Associated Univ., Oak Ridge, TN (United States); General Atomics
General Atomics, San Diego, CA (United States)
Univ. of California, San Diego, La Jolla, CA (United States)
Princeton Univ., NJ (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

In this paper, we report the key role that toroidal rotation and the related E × B shear physics played in the very high energy confinement quality (H_98y2 > 1.5) of super H-mode experiments on DIII-D. Experiments show that the energy confinement quality decreases when toroidal rotation decreases due to the decreased externally controlled torque per particle. Meanwhile, the total pedestal pressure in the experiments remains very high during the rotation and confinement quality change. TGYRO transport modeling suggests the contribution from rotation in the E × B shear is responsible for the confinement quality in excess of standard H-mode (H_98y2 ~ 1). CGYRO gyrokinetic simulations reveal the governing physics in the core plasma of super H-modes: significant up-shift of nonlinear the ITG critical gradient is observed when applying E × B shear physics in the modeling based on experimental data. Furthermore, the effects of other physical parameters and contribution from pedestal height, which may play minor roles in this study, are also discussed.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: FC02-04ER54698; SC0010685; SC0018287; AC02-09CH11466; SC0016154

OSTI ID:: 1828879

Alternate ID(s):: OSTI ID: 1828980

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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