The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]

Garofalo, Andrea M.; Burrell, Keith H.; Eldon, David; Grierson, Brian A.; Hanson, Jeremy M.; Holland, Christopher; Huijsmans, Guido T. A.; Liu, Feng; Loarte, Alberto; Meneghini, Orso; Osborne, T. H.; Paz-Soldan, C.; Smith, S. P.; Snyder, P. B.; Solomon, W. M.; Turnbull, A. D.; Zeng, L.

doi:10.1063/1.4921406

Title: The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]

Journal Article · Tue May 26 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921406· OSTI ID:1350084

Garofalo, Andrea M. ^[1];

^[1];

^[2]; Grierson, Brian A. ^[2]; Hanson, Jeremy M. ^[3]; Holland, Christopher ^[4];

^[5]; Liu, Feng ^[5]; Loarte, Alberto ^[5]; Meneghini, Orso ^[1]; Osborne, T. H. ^[1]; Paz-Soldan, C. ^[1]; Smith, S. P. ^[1]; Snyder, P. B. ^[1]; Solomon, W. M. ^[2];

^[1]; Zeng, L. ^[6]

General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Columbia Univ., New York, NY (United States)
Univ. of California San Diego, La Jolla, CA (United States)
ITER Organization, St. Paul Lez Durance (France)
Univ. of California, Los Angeles, CA (United States)

For the first time, DIII-D experiments have achieved stationary quiescent H-mode (QH-mode) operation for many energy confinement times at simultaneous ITER-relevant values of beta, confinement, and safety factor, in an ITER similar shape. QH-mode provides excellent energy confinement, even at very low plasma rotation, while operating without edge localized modes (ELMs) and with strong impurity transport via the benign edge harmonic oscillation (EHO). By tailoring the plasma shape to improve the edge stability, the QH-mode operating space has also been extended to densities exceeding 80% of the Greenwald limit, overcoming the long-standing low-density limit of QH-mode operation. In the theory, the density range over which the plasma encounters the kink-peeling boundary widens as the plasma cross-section shaping is increased, thus increasing the QH-mode density threshold. Here, the DIII-D results are in excellent agreement with these predictions, and nonlinear MHD analysis of reconstructed QH-mode equilibria shows unstable low n kink-peeling modes growing to a saturated level, consistent with the theoretical picture of the EHO. Furthermore, high density operation in the QH-mode regime has opened a path to a new, previously predicted region of parameter space, named “Super H-mode” because it is characterized by very high pedestals that can be more than a factor of two above the peeling-ballooning stability limit for similar ELMing H-mode discharges at the same density.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466; FG02-04ER54761; FG02-07ER54917; FG02-08ER54984

OSTI ID:: 1350084

Alternate ID(s):: OSTI ID: 1228312

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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Discovery of stationary operation of quiescent H-mode plasmas with net-zero neutral beam injection torque and high energy confinement on DIII-D Burrell, K. H.; Barada, K.; Chen, X. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4943521	journal	March 2016
Helical core formation and evolution during current ramp-up in the high-field tokamak Alcator C-Mod Wingen, A.; Wilcox, R. S.; Delgado-Aparicio, L. F. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5083055	journal	February 2019
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Progress of the CFETR design Zhuang, G.; Li, G. Q.; Li, J. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab0e27	journal	June 2019
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