How the birth and death of shear layers determine confinement evolution: from the L → H transition to the density limit
Abstract
Electric field profile structure—especially its shear—is a natural order parameter for the edge plasma, and characterizes confinement regimes ranging from the H-mode (Wagner et al. 1982 Phys. Rev. Lett.49, 1408–1412 (doi:10.1103/PhysRevLett.49.1408)) to the density limit (DL) (Greenwald et al. 1988 Nucl. Fusion28, 2199–2207 (doi:10.1088/0029-5515/28/12/009)). The theoretical developments and lessons learned during 40 years of H-mode studies (Connor & Wilson 1999 Plasma Phys. Control. Fusion42, R1–R74 (doi:10.1088/0741-3335/42/1/201); Wagner 2007 Plasma Phys. Control. Fusion49, B1–B33 (doi:10.1088/0741-3335/49/12b/s01)) are applied to the shear layer collapse paradigm (Hong et al. 2017 Nucl. Fusion58, 016041 (doi:10.1088/1741-4326/aa9626)) for the onset of DL phenomena. Results from recent experiments on edge shear layers and DL phenomenology are summarized and discussed in the light of L → H transition physics. The theory of shear layer collapse is then developed. In this work, we demonstrate that shear layer physics captures both the well known current (Greenwald) scaling of the DL (Greenwald 2002 Plasma Phys. Control. Fusion44, R27–R53 (doi:10.1088/0741-3335/44/8/201); Greenwald et al. 2014 Phys. Plasmas21, 110501 (doi:10.1063/1.4901920)), as well as the emerging power scaling (Zanca, Sattin, JET Contributors 2019 Nucl. Fusion59, 126011 (doi:10.1088/1741-4326/ab3b31)). The derivation of the power scaling theory exploits an existing model, originally developed for the L → H transitionmore »
- Authors:
-
[1];
[1];
[2];
[3];
[2];
[4];
[1];
[5]
- Univ. of California San Diego, La Jolla, CA (United States)
- Southwestern Institute of Physics, Chengdu (China)
- Univ. of California, Los Angeles, CA (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of California, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1907842
- Grant/Contract Number:
- FG02-04ER54738; FG02-07ER54912; AC02-09CH11466; SC0022528; NSF PHY-1748958; 2018YFE0310300; 2022YFE03100004; U1867222; 11905050; 11875124; 2022NSFSC1791; 2020JDTD0030
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
- Additional Journal Information:
- Journal Volume: 381; Journal Issue: 2242; Journal ID: ISSN 1364-503X
- Publisher:
- The Royal Society Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; L–H transition; turbulent transport; density limit; shear flow
Citation Formats
Diamond, Patrick H., Singh, Rameswar, Long, Ting, Hong, Rongjie, Ke, Rui, Yan, Zheng, Cao, Mingyun, and Tynan, George R. How the birth and death of shear layers determine confinement evolution: from the L → H transition to the density limit. United States: N. p., 2023.
Web. doi:10.1098/rsta.2021.0227.
Diamond, Patrick H., Singh, Rameswar, Long, Ting, Hong, Rongjie, Ke, Rui, Yan, Zheng, Cao, Mingyun, & Tynan, George R. How the birth and death of shear layers determine confinement evolution: from the L → H transition to the density limit. United States. https://doi.org/10.1098/rsta.2021.0227
Diamond, Patrick H., Singh, Rameswar, Long, Ting, Hong, Rongjie, Ke, Rui, Yan, Zheng, Cao, Mingyun, and Tynan, George R. Mon .
"How the birth and death of shear layers determine confinement evolution: from the L → H transition to the density limit". United States. https://doi.org/10.1098/rsta.2021.0227. https://www.osti.gov/servlets/purl/1907842.
@article{osti_1907842,
title = {How the birth and death of shear layers determine confinement evolution: from the L → H transition to the density limit},
author = {Diamond, Patrick H. and Singh, Rameswar and Long, Ting and Hong, Rongjie and Ke, Rui and Yan, Zheng and Cao, Mingyun and Tynan, George R.},
abstractNote = {Electric field profile structure—especially its shear—is a natural order parameter for the edge plasma, and characterizes confinement regimes ranging from the H-mode (Wagner et al. 1982 Phys. Rev. Lett.49, 1408–1412 (doi:10.1103/PhysRevLett.49.1408)) to the density limit (DL) (Greenwald et al. 1988 Nucl. Fusion28, 2199–2207 (doi:10.1088/0029-5515/28/12/009)). The theoretical developments and lessons learned during 40 years of H-mode studies (Connor & Wilson 1999 Plasma Phys. Control. Fusion42, R1–R74 (doi:10.1088/0741-3335/42/1/201); Wagner 2007 Plasma Phys. Control. Fusion49, B1–B33 (doi:10.1088/0741-3335/49/12b/s01)) are applied to the shear layer collapse paradigm (Hong et al. 2017 Nucl. Fusion58, 016041 (doi:10.1088/1741-4326/aa9626)) for the onset of DL phenomena. Results from recent experiments on edge shear layers and DL phenomenology are summarized and discussed in the light of L → H transition physics. The theory of shear layer collapse is then developed. In this work, we demonstrate that shear layer physics captures both the well known current (Greenwald) scaling of the DL (Greenwald 2002 Plasma Phys. Control. Fusion44, R27–R53 (doi:10.1088/0741-3335/44/8/201); Greenwald et al. 2014 Phys. Plasmas21, 110501 (doi:10.1063/1.4901920)), as well as the emerging power scaling (Zanca, Sattin, JET Contributors 2019 Nucl. Fusion59, 126011 (doi:10.1088/1741-4326/ab3b31)). The derivation of the power scaling theory exploits an existing model, originally developed for the L → H transition (Diamond, Liang, Carreras, Terry 1994 Phys. Rev. Lett.72, 2565–2568 (doi:10.1103/PhysRevLett.72.2565); Kim & Diamond 2003 Phys. Rev. Lett.90, 185006 (doi:10.1103/PhysRevLett.90.185006)). We describe the enhanced particle transport events that occur following shear layer collapse. Open problems and future directions are discussed.},
doi = {10.1098/rsta.2021.0227},
journal = {Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences},
number = 2242,
volume = 381,
place = {United States},
year = {Mon Jan 02 00:00:00 EST 2023},
month = {Mon Jan 02 00:00:00 EST 2023}
}
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