Access to a new plasma edge state with high density and pressures using the quiescent H mode

Solomon, Wayne M.; Snyder, Philip B.; Burrell, Keith H.; Fenstermacher, Max E.; Garofalo, Andrea M.; Grierson, Brian A.; Loarte, Alberto; McKee, George R.; Nazikian, Raffi; Osborne, Thomas H.

doi:10.1103/PhysRevLett.113.135001

Title: Access to a new plasma edge state with high density and pressures using the quiescent $H$ mode

Journal Article · Wed Sep 24 00:00:00 EDT 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.113.135001· OSTI ID:1367150

Solomon, Wayne M. ^[1]; Snyder, Philip B. ^[2]; Burrell, Keith H. ^[2]; Fenstermacher, Max E. ^[3]; Garofalo, Andrea M. ^[2]; Grierson, Brian A. ^[1]; Loarte, Alberto ^[4]; McKee, George R. ^[5]; Nazikian, Raffi ^[1]; Osborne, Thomas H. ^[2]

Princeton Univ., Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
ITER Organization, Saint Paul Lez Durance Cedex (France)
Univ. of Wisconsin, Madison, WI (United States)

A path to a new high performance regime has been discovered in tokamaks that could improve the attractiveness of a fusion reactor. Experiments on DIII-D using a quiescent H-mode edge have navigated a valley of improved edge peeling-ballooning stability that opens up with strong plasma shaping at high density, leading to a doubling of the edge pressure over the standard H mode with edge localized modes at these parameters. The thermal energy confinement time increases as a result of both the increased pedestal height and improvements in the core transport and reduced low-k turbulence. As a result, calculations of the pedestal height and width as a function of density using constraints imposed by peeling-ballooning and kinetic-ballooning theory are in quantitative agreement with the measurements.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466; AC52-07NA27344; FG02-89ER53296; FG02-08ER54999; FG02-95ER54309

OSTI ID:: 1367150

Alternate ID(s):: OSTI ID: 1180685

Journal Information:: Physical Review Letters, Vol. 113, Issue 13; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 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
Predict-first experimental analysis using automated and integrated magnetohydrodynamic modeling Lyons, B. C.; Paz-Soldan, C.; Meneghini, O. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025838	journal	May 2018
Super H-mode: theoretical prediction and initial observations of a new high performance regime for tokamak operation Snyder, P. B.; Solomon, W. M.; Burrell, K. H. Nuclear Fusion, Vol. 55, Issue 8 https://doi.org/10.1088/0029-5515/55/8/083026	journal	July 2015
Intermediate- k density and magnetic field fluctuations during inter-ELM pedestal evolution in MAST Hillesheim, J. C.; Dickinson, D.; Roach, C. M. Plasma Physics and Controlled Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/0741-3335/58/1/014020	journal	November 2015
Theoretical explanation of I-mode impurity removal and energy confinement Espinosa, Silvia; Catto, Peter J. Plasma Physics and Controlled Fusion, Vol. 60, Issue 9 https://doi.org/10.1088/1361-6587/aad0c9	journal	July 2018
Current and pressure gradient triggering and nonlinear saturation of low- n edge harmonic oscillations in tokamaks Kleiner, A.; Graves, J. P.; Brunetti, D. Plasma Physics and Controlled Fusion, Vol. 61, Issue 8 https://doi.org/10.1088/1361-6587/ab2444	journal	June 2019
Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod Hughes, J. W.; Snyder, P. B.; Reinke, M. L. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aabc8a	journal	September 2018
DIII-D research towards establishing the scientific basis for future fusion reactors Petty, C. C. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab024a	journal	June 2019
High fusion performance in Super H-mode experiments on Alcator C-Mod and DIII-D Snyder, P. B.; Hughes, J. W.; Osborne, T. H. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab235b	journal	June 2019
Alfvén eigenmodes and fast ion transport in negative triangularity DIII-D plasmas Van Zeeland, M. A.; Collins, C. S.; Heidbrink, W. W. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2488	journal	June 2019
27th IAEA Fusion Energy Conference: summary of sessions EX/C, EX/S and PPC Campbell, D. J. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5cee	journal	January 2020
On the very high energy confinement observed in super H-mode DIII-D experiments Ding, S.; Garofalo, A. M.; Knolker, M. Nuclear Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1741-4326/ab66db	journal	January 2020

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