MHD stability of negative triangularity DIII-D plasmas

Boyes, W.; Turco, F.; Hanson, J.; Marinoni, A.; Turnbull, A.; Austin, M.; Navratil, G.

doi:10.1088/1741-4326/acd564

Title: MHD stability of negative triangularity DIII-D plasmas

Journal Article · 19 June 2023 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/acd564 · OSTI ID:1985944

;

; Turnbull, A.;

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Abstract Negative triangularity (NT) experiments in DIII-D point to an emergent reactor scenario free of sawteeth, endowed with benign, nondisruptive n = 2 tearing modes, which experience q _min $⩾$ 1 similar to the positive triangularity hybrid scenario. Plasmas exhibiting this behavior attain $β_{N} > 3$ , high enough to reconsider long held views of NT stability. Ideal MHD and tearing stability analysis of well-diagnosed equilibrium reconstructions of experimental hybrid-like plasmas predict that among shape parameters, MHD stability limits are only sensitive to average triangularity. Operation is predicted to be possible at $β_{N}$ relevant to upcoming tokamaks and commercial NT reactors.

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Research Organization:: Columbia Univ., New York, NY (United States); General Atomics, San Diego, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Texas, Austin, TX (United States)

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

Grant/Contract Number:: FC02-04ER54698; FG02-04ER54761; FG02-97ER54415; SC0016154

OSTI ID:: 1985944

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 63; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

References (37)

Linear Stability of Resistive MHD Modes: Axisymmetric Toroidal Computation of the Outer Region Matching Data Pletzer, A.; Bondeson, A.; Dewar, R. L. Journal of Computational Physics, Vol. 115, Issue 2 https://doi.org/10.1006/jcph.1994.1215	journal	December 1994
GATO: An MHD stability code for axisymmetric plasmas with internal separatrices Bernard, L. C.; Helton, F. J.; Moore, R. W. Computer Physics Communications, Vol. 24, Issue 3-4 https://doi.org/10.1016/0010-4655(81)90160-0	journal	December 1981
Design and operation of the multipulse Thomson scattering diagnostic on DIII‐D (invited) Carlstrom, T. N.; Campbell, G. L.; DeBoo, J. C. Review of Scientific Instruments, Vol. 63, Issue 10 https://doi.org/10.1063/1.1143545	journal	October 1992
Improved charge coupled device detectors for the edge charge exchange spectroscopy system on the DIII-D tokamak Burrell, K. H.; Kaplan, D. H.; Gohil, P. Review of Scientific Instruments, Vol. 72, Issue 1 https://doi.org/10.1063/1.1319363	journal	January 2001
Tearing mode stability studies near ideal stability boundaries in DIII-D Brennan, D. P.; Strait, E. J.; Turnbull, A. D. Physics of Plasmas, Vol. 9, Issue 7 https://doi.org/10.1063/1.1481504	journal	July 2002
Electron cyclotron emission radiometer upgrade on the DIII-D tokamak Austin, M. E.; Lohr, J. Review of Scientific Instruments, Vol. 74, Issue 3 https://doi.org/10.1063/1.1530387	journal	March 2003
A mechanism for tearing onset near ideal stability boundaries Brennan, D. P.; La Haye, R. J.; Turnbull, A. D. Physics of Plasmas, Vol. 10, Issue 5 https://doi.org/10.1063/1.1555830	journal	May 2003
Magnetic diagnostic system of the DIII-D tokamak Strait, E. J. Review of Scientific Instruments, Vol. 77, Issue 2 https://doi.org/10.1063/1.2166493	journal	February 2006
Motional Stark effect diagnostic expansion on DIII-D for enhanced current and Er profile measurements Holcomb, C. T.; Makowski, M. A.; Jayakumar, R. J. Review of Scientific Instruments, Vol. 77, Issue 10 https://doi.org/10.1063/1.2235812	journal	October 2006
Fiber optic two-color vibration compensated interferometer for plasma density measurements Van Zeeland, M. A.; Boivin, R. L.; Carlstrom, T. N. Review of Scientific Instruments, Vol. 77, Issue 10 https://doi.org/10.1063/1.2336437	journal	October 2006
Resistive stability of 2∕1 modes near 1∕1 resonance Brennan, D. P.; Turnbull, A. D.; Chu, M. S. Physics of Plasmas, Vol. 14, Issue 5 https://doi.org/10.1063/1.2515224	journal	May 2007
Optimizing stability, transport, and divertor operation through plasma shaping for steady-state scenario development in DIII-D Holcomb, C. T.; Ferron, J. R.; Luce, T. C. Physics of Plasmas, Vol. 16, Issue 5 https://doi.org/10.1063/1.3125934	journal	May 2009
The high-βN hybrid scenario for ITER and FNSF steady-state missionsa) Turco, F.; Petty, C. C.; Luce, T. C. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4921161	journal	May 2015
The direct criterion of Newcomb for the ideal MHD stability of an axisymmetric toroidal plasma Glasser, A. H. Physics of Plasmas, Vol. 23, Issue 7 https://doi.org/10.1063/1.4958328	journal	July 2016
Computation of resistive instabilities by matched asymptotic expansions Glasser, A. H.; Wang, Z. R.; Park, J. -K. Physics of Plasmas, Vol. 23, Issue 11 https://doi.org/10.1063/1.4967862	journal	November 2016
H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D Marinoni, A.; Austin, M. E.; Hyatt, A. W. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5091802	journal	April 2019
Electromagnetic kinetic toroidal eigenmodes for general magnetohydrodynamic equilibria Rewoldt, G. Physics of Fluids, Vol. 25, Issue 3 https://doi.org/10.1063/1.863760	journal	January 1982
Stability of high beta tokamak plasmas* Strait, E. J. Physics of Plasmas, Vol. 1, Issue 5 https://doi.org/10.1063/1.870691	journal	May 1994
Transport effects of low (m,n) MHD modes on TFTR supershots Chang, Z.; Fredrickson, E. D.; Callen, J. D. Nuclear Fusion, Vol. 34, Issue 10 https://doi.org/10.1088/0029-5515/34/10/I03	journal	October 1994
Synergism between cross-section and profile shaping in beta optimization of tokamak equilibria with negative central shear Turnbull, A. D.; Taylor, T. S.; Chu, M. S. Nuclear Fusion, Vol. 38, Issue 10 https://doi.org/10.1088/0029-5515/38/10/305	journal	October 1998
On the operational ideal magnetohydrodynamic limit in sawtoothing discharges Turnbull, A. D.; Pearlstein, L. D.; Bulmer, R. H. Nuclear Fusion, Vol. 39, Issue 11 https://doi.org/10.1088/0029-5515/39/11/307	journal	November 1999
Development, physics basis and performance projections for hybrid scenario operation in ITER on DIII-D Wade, M. R.; Luce, T. C.; Jayakumar, R. J. Nuclear Fusion, Vol. 45, Issue 6 https://doi.org/10.1088/0029-5515/45/6/001	journal	May 2005
Impact of plasma triangularity and collisionality on electron heat transport in TCV L-mode plasmas Camenen, Y.; Pochelon, A.; Behn, R. Nuclear Fusion, Vol. 47, Issue 7 https://doi.org/10.1088/0029-5515/47/7/002	journal	June 2007
Pedestal performance dependence upon plasma shape in DIII-D Leonard, A. W.; Casper, T. A.; Groebner, R. J. Nuclear Fusion, Vol. 47, Issue 7 https://doi.org/10.1088/0029-5515/47/7/006	journal	June 2007
Access to high beta advanced inductive plasmas at low injected torque Solomon, W. M.; Politzer, P. A.; Buttery, R. J. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093033	journal	September 2013
The negative triangularity tokamak: stability limits and prospects as a fusion energy system Medvedev, S. Yu.; Kikuchi, M.; Villard, L. Nuclear Fusion, Vol. 55, Issue 6 https://doi.org/10.1088/0029-5515/55/6/063013	journal	May 2015
The effect of plasma triangularity on turbulent transport: modeling TCV experiments by linear and non-linear gyrokinetic simulations Marinoni, A.; Brunner, S.; Camenen, Y. Plasma Physics and Controlled Fusion, Vol. 51, Issue 5 https://doi.org/10.1088/0741-3335/51/5/055016	journal	March 2009
A simplified analytic form for generation of axisymmetric plasma boundaries Luce, T. C. Plasma Physics and Controlled Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1361-6587/aa5393	journal	February 2017
Ballooning instability preventing the H-mode access in plasmas with negative triangularity shape on the DIII–D tokamak Saarelma, S.; Austin, M. E.; Knolker, M. Plasma Physics and Controlled Fusion, Vol. 63, Issue 10 https://doi.org/10.1088/1361-6587/ac1ea4	journal	September 2021
Stability of DIII-D high-performance, negative central shear discharges Hanson, J. M.; Berkery, J. W.; Bialek, J. Nuclear Fusion, Vol. 57, Issue 5 https://doi.org/10.1088/1741-4326/aa6266	journal	March 2017
Advances in the steady-state hybrid regime in DIII-D—a fully non-inductive, ELM-suppressed scenario for ITER Petty, C. C.; Nazikian, R.; Park, J. M. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa80ab	journal	August 2017
L-mode-edge negative triangularity tokamak reactor Kikuchi, M.; Takizuka, T.; Medvedev, S. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab076d	journal	April 2019
Diverted negative triangularity plasmas on DIII-D: the benefit of high confinement without the liability of an edge pedestal Marinoni, A.; Austin, M. E.; Hyatt, A. W. Nuclear Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1741-4326/ac1f60	journal	September 2021
Transport Phenomena in a Completely Ionized Gas Spitzer, Lyman; Härm, Richard Physical Review, Vol. 89, Issue 5 https://doi.org/10.1103/PhysRev.89.977	journal	March 1953
Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak Austin, M. E.; Marinoni, A.; Walker, M. L. Physical Review Letters, Vol. 122, Issue 11 https://doi.org/10.1103/PhysRevLett.122.115001	journal	March 2019
MHD Equilibrium Reconstruction in the DIII-D Tokamak Lao, L. L.; John, H. E. St.; Peng, Q. Fusion Science and Technology, Vol. 48, Issue 2 https://doi.org/10.13182/FST48-968	journal	October 2005
CORSICA: A comprehensive simulation of toroidal magnetic-fusion devices. Final report to the LDRD Program Crotinger, J. A.; LoDestro, L.; Pearlstein, L. D. https://doi.org/10.2172/522508	report	March 1997

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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scenarios
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Title: MHD stability of negative triangularity DIII-D plasmas

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