The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D
Abstract
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 (H98y2 > 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 (H98y2 ~ 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.
- Authors:
-
[1];
[2];
[3];
[3];
[4];
[2];
[5];
[2];
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- 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)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1828879
- Alternate Identifier(s):
- OSTI ID: 1828980
- Grant/Contract Number:
- FC02-04ER54698; SC0010685; SC0018287; AC02-09CH11466; SC0016154
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 11; 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; Plasma confinement; Plasma properties and parameters; Tokamaks; Gyrokinetic simulations; Transport properties
Citation Formats
Ding, S., Garofalo, Andrea M., Jian, X., Holland, C., Grierson, B. A., Solomon, W. M., Marinoni, A., Knolker, M., and McClenaghan, J.. The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D. United States: N. p., 2021.
Web. doi:10.1063/5.0061786.
Ding, S., Garofalo, Andrea M., Jian, X., Holland, C., Grierson, B. A., Solomon, W. M., Marinoni, A., Knolker, M., & McClenaghan, J.. The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D. United States. https://doi.org/10.1063/5.0061786
Ding, S., Garofalo, Andrea M., Jian, X., Holland, C., Grierson, B. A., Solomon, W. M., Marinoni, A., Knolker, M., and McClenaghan, J.. Thu .
"The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D". United States. https://doi.org/10.1063/5.0061786. https://www.osti.gov/servlets/purl/1828879.
@article{osti_1828879,
title = {The role of toroidal rotation in the very high energy confinement quality observed in super H-mode experiments on DIII-D},
author = {Ding, S. and Garofalo, Andrea M. and Jian, X. and Holland, C. and Grierson, B. A. and Solomon, W. M. and Marinoni, A. and Knolker, M. and McClenaghan, J.},
abstractNote = {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 (H98y2 > 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 (H98y2 ~ 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.},
doi = {10.1063/5.0061786},
journal = {Physics of Plasmas},
number = 11,
volume = 28,
place = {United States},
year = {2021},
month = {11}
}
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