Tearing Stable Stationary ITER Baseline Operation in DIII-D

Bardoczi, Laszlo; Dudkovskaia, Alexandra; Logan, Nikolas; Richner, Nathan Jordan; Brown, Ashton Clair; Callen, James D.; La Haye, Robert John; Strait, E. J.

doi:10.1088/1741-4326/ad9ec3

Title: Tearing Stable Stationary ITER Baseline Operation in DIII-D

Journal Article · 12 December 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad9ec3 · OSTI ID:2507118

^[1]; Dudkovskaia, Alexandra ^[2];

^[3];

^[4]; Brown, Ashton Clair ^[1]; Callen, James D. ^[5]; La Haye, Robert John ^[6];

^[6]

University of California, Irvine, CA (United States)
University of York (United Kingdom of Great Britain and Northern Ireland)
Columbia University, New York, NY (United States)
Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
University of Wisconsin-Madison, WI (United States)
General Atomics, San Diego, CA (United States)

We present a tearing stable, stationary and reproducible operating solution for DIII-D plasmas characterized by the ITER Baseline Scenario normalized parameter set and shape. In these plasmas low differential rotation (Δf1,2) between the core and edge is identified as the single root cause of the onset of the primary limiting instability, the 2,1 Neoclassical Tearing Mode (NTM), while a group of other examined parameters have a much weaker impact on the stability. Explanation is offered by drift kinetic simulations, which show a six-fold reduction in the NTM onset threshold due to diminished stabilizing ion polarization currents when the seed island drift frequency ceases in the local plasma frame. Based on the experimental observation and the explanation provided by the theory, a new method is developed to sustain Δf1,2 by modifying the edge neoclassical potential through neutral gas fueling. This method enables stationary ITER baseline operation free of disruptive 2,1 tearing modes.

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

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

Grant/Contract Number:: FC02-04ER54698; FG02-95ER54309; SC0022270

OSTI ID:: 2507118

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 65; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (59)

Polarimetry of motional Stark effect and determination of current profiles in DIII‐D (invited) Wróblewski, D.; Lao, L. L. Review of Scientific Instruments, Vol. 63, Issue 10 https://doi.org/10.1063/1.1143463	journal	October 1992
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
Neoclassical tearing modes and their control La Haye, R. J. Physics of Plasmas, Vol. 13, Issue 5 https://doi.org/10.1063/1.2180747	journal	May 2006
The influence of the ion polarization current on magnetic island stability in a tokamak plasma Fitzpatrick, R.; Waelbroeck, F. L.; Militello, F. Physics of Plasmas, Vol. 13, Issue 12 https://doi.org/10.1063/1.2402914	journal	December 2006
The influence of rotation on the βN threshold for the 2∕1 neoclassical tearing mode in DIII-D Buttery, R. J.; La Haye, R. J.; Gohil, P. Physics of Plasmas, Vol. 15, Issue 5 https://doi.org/10.1063/1.2894215	journal	May 2008
Testing neoclassical and turbulent effects on poloidal rotation in the core of DIII-D Chrystal, C.; Burrell, K. H.; Grierson, B. A. Physics of Plasmas, Vol. 21, Issue 7 https://doi.org/10.1063/1.4887296	journal	July 2014
The targeted heating and current drive applications for the ITER electron cyclotron system Henderson, M.; Saibene, G.; Darbos, C. Physics of Plasmas, Vol. 22, Issue 2 https://doi.org/10.1063/1.4908598	journal	February 2015
Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D Chrystal, C.; Grierson, B. A.; Staebler, G. M. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4979194	journal	May 2017
A robust solution for the resistive MHD toroidal Δ′ matrix in near real-time Glasser, Alexander S.; Kolemen, Egemen Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5029477	journal	August 2018
Numerical study of tearing mode seeding in tokamak X-point plasma Meshcheriakov, Dmytro; Hoelzl, Matthias; Igochine, Valentin Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5086402	journal	April 2019
Main-ion intrinsic toroidal rotation across the ITG/TEM boundary in DIII-D discharges during ohmic and electron cyclotron heating Grierson, B. A.; Chrystal, C.; Haskey, S. R. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5090505	journal	April 2019
Island bootstrap current modification of the nonlinear dynamics of the tearing mode Carrera, R.; Hazeltine, R. D.; Kotschenreuther, M. Physics of Fluids, Vol. 29, Issue 4 https://doi.org/10.1063/1.865682	journal	January 1986
Threshold for neoclassical magnetic islands in a low collision frequency tokamak Wilson, H. R.; Connor, J. W.; Hastie, R. J. Physics of Plasmas, Vol. 3, Issue 1 https://doi.org/10.1063/1.871830	journal	January 1996
Beta limits in long-pulse tokamak discharges Sauter, O.; La Haye, R. J.; Chang, Z. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872270	journal	May 1997
Generalized kinetic equation for tokamak plasma equilibrium distribution function Dudkovskaia, A. V.; Wilson, H. R. Physics of Plasmas, Vol. 31, Issue 2 https://doi.org/10.1063/5.0178831	journal	February 2024
Equilibrium analysis of current profiles in tokamaks Lao, L. L.; Ferron, J. R.; Groebner, R. J. Nuclear Fusion, Vol. 30, Issue 6 https://doi.org/10.1088/0029-5515/30/6/006	journal	June 1990
Onset of neoclassical tearing modes on JET Buttery, R. J.; Hender, T. C.; Howell, D. F. Nuclear Fusion, Vol. 43, Issue 2 https://doi.org/10.1088/0029-5515/43/2/301	journal	January 2003
Density response to central electron heating: theoretical investigations and experimental observations in ASDEX Upgrade Angioni, C.; Peeters, A. G.; Garbet, X. Nuclear Fusion, Vol. 44, Issue 8 https://doi.org/10.1088/0029-5515/44/8/003	journal	June 2004
Pellet fuelling and control of burning plasmas in ITER Baylor, L. R.; Parks, P. B.; Jernigan, T. C. Nuclear Fusion, Vol. 47, Issue 5 https://doi.org/10.1088/0029-5515/47/5/008	journal	May 2007
Characterization of intrinsic rotation drive on DIII-D Solomon, W. M.; Burrell, K. H.; deGrassie, J. S. Nuclear Fusion, Vol. 51, Issue 7 https://doi.org/10.1088/0029-5515/51/7/073010	journal	May 2011
Statistical analysis of m / n = 2/1 locked and quasi-stationary modes with rotating precursors at DIII-D Sweeney, R.; Choi, W.; La Haye, R. J. Nuclear Fusion, Vol. 57, Issue 1 https://doi.org/10.1088/0029-5515/57/1/016019	journal	November 2016
Experimental study of electron heat transport in ion heated H-modes in ASDEX Upgrade Manini, A.; Ryter, F.; Angioni, C. Plasma Physics and Controlled Fusion, Vol. 46, Issue 11 https://doi.org/10.1088/0741-3335/46/11/004	journal	September 2004
Kinetic calculation of neoclassical transport including self-consistent electron and impurity dynamics Belli, E. A.; Candy, J. Plasma Physics and Controlled Fusion, Vol. 50, Issue 9 https://doi.org/10.1088/0741-3335/50/9/095010	journal	July 2008
An Eulerian method for the solution of the multi-species drift-kinetic equation Belli, E. A.; Candy, J. Plasma Physics and Controlled Fusion, Vol. 51, Issue 7 https://doi.org/10.1088/0741-3335/51/7/075018	journal	June 2009
Full linearized Fokker–Planck collisions in neoclassical transport simulations Belli, E. A.; Candy, J. Plasma Physics and Controlled Fusion, Vol. 54, Issue 1 https://doi.org/10.1088/0741-3335/54/1/015015	journal	December 2011
Influence of rotation on the ( m , n ) = (3, 2) neoclassical tearing mode threshold in the ASDEX Upgrade Fietz, S.; Maraschek, M.; Zohm, H. Plasma Physics and Controlled Fusion, Vol. 55, Issue 8 https://doi.org/10.1088/0741-3335/55/8/085010	journal	June 2013
Equivalence of two different approaches to global δ f gyrokinetic simulations Parra, Felix I.; Barnes, Michael Plasma Physics and Controlled Fusion, Vol. 57, Issue 5 https://doi.org/10.1088/0741-3335/57/5/054003	journal	April 2015
Experimental study of density pump-out effect with on-axis electron cyclotron resonance heating at the T-10 tokamak Andreev, V. F.; Borschegovskij, A. A.; Chistyakov, V. V. Plasma Physics and Controlled Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/0741-3335/58/5/055008	journal	March 2016
Experimental observations of driven and intrinsic rotation in tokamak plasmas Rice, J. E. Plasma Physics and Controlled Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/0741-3335/58/8/083001	journal	July 2016
Quantitative modeling of neoclassical tearing mode driven fast ion transport in integrated TRANSP simulations Bardóczi, L.; Podestà, M.; Heidbrink, W. W. Plasma Physics and Controlled Fusion, Vol. 61, Issue 5 https://doi.org/10.1088/1361-6587/ab0f08	journal	April 2019
Spectral treatment of gyrokinetic profile curvature Candy, J.; Belli, E. A.; Staebler, G. Plasma Physics and Controlled Fusion, Vol. 62, Issue 4 https://doi.org/10.1088/1361-6587/ab759c	journal	February 2020
Drift kinetic theory of neoclassical tearing modes in a low collisionality tokamak plasma: magnetic island threshold physics Dudkovskaia, A. V.; Connor, J. W.; Dickinson, D. Plasma Physics and Controlled Fusion, Vol. 63, Issue 5 https://doi.org/10.1088/1361-6587/abea2e	journal	April 2021
Nonlinear second order electromagnetic gyrokinetic theory for a tokamak plasma Dudkovskaia, A. V.; Wilson, H. R.; Connor, J. W. Plasma Physics and Controlled Fusion, Vol. 65, Issue 4 https://doi.org/10.1088/1361-6587/acb173	journal	March 2023
Quantifying the role of higher order neoclassical corrections to gyrokinetics in tokamak plasmas Dudkovskaia, A. V.; Connor, J. W.; Dickinson, D. Plasma Physics and Controlled Fusion, Vol. 65, Issue 5 https://doi.org/10.1088/1361-6587/acc688	journal	April 2023
On the effect of neoclassical flows on intrinsic momentum in ASDEX Upgrade Ohmic L-mode plasmas Hornsby, W. A.; Angioni, C.; Fable, E. Nuclear Fusion, Vol. 57, Issue 4 https://doi.org/10.1088/1741-4326/aa5aa1	journal	February 2017
Understanding ECH density pump-out in DIII-D H-mode plasmas Wang, X.; Mordijck, S.; Doyle, E. J. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7f99	journal	August 2017
Multiscale interaction between a large scale magnetic island and small scale turbulence Choi, M. J.; Kim, J.; Kwon, J. -M. Nuclear Fusion, Vol. 57, Issue 12 https://doi.org/10.1088/1741-4326/aa86fe	journal	October 2017
The causes of the disruptive tearing instabilities of the ITER Baseline Scenario in DIII-D Turco, F.; Luce, T. C.; Solomon, W. Nuclear Fusion, Vol. 58, Issue 10 https://doi.org/10.1088/1741-4326/aadbb5	journal	September 2018
Finite ion orbit width effect on the neoclassical tearing mode threshold in a tokamak plasma Imada, K.; Wilson, H. R.; Connor, J. W. Nuclear Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1741-4326/ab00ba	journal	February 2019
Numerical study on toroidal mode coupling and triggering of neoclassical tearing modes by sawteeth Yu, Q.; Günter, S.; Lackner, K. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab3a6b	journal	September 2019
Drift kinetic theory of the NTM magnetic islands in a finite beta general geometry tokamak plasma Dudkovskaia, A. V.; Bardoczi, L.; Connor, J. W. Nuclear Fusion, Vol. 63, Issue 1 https://doi.org/10.1088/1741-4326/aca48d	journal	December 2022
A comparison of the influence of plasmoid-drift mechanisms on plasma fuelling by cryogenic pellets in ITER and Wendelstein 7-X Panadero, N.; Koechl, F.; Polevoi, A. R. Nuclear Fusion, Vol. 63, Issue 4 https://doi.org/10.1088/1741-4326/acbc34 046022	journal	March 2023
Direct preemptive stabilization of $m, n = 2, 1$ neoclassical tearing modes by electron cyclotron current drive in the DIII-D low-torque ITER baseline scenario Bardóczi, L.; La Haye, R. J.; Strait, E. J. Nuclear Fusion, Vol. 63, Issue 9 https://doi.org/10.1088/1741-4326/acec5c 096021	journal	August 2023
Drift kinetic theory of neoclassical tearing modes in tokamak plasmas: polarisation current and its effect on magnetic island threshold physics Dudkovskaia, A. V.; Connor, J. W.; Dickinson, D. Nuclear Fusion, Vol. 63, Issue 12 https://doi.org/10.1088/1741-4326/acfe8c	journal	October 2023
The onset distribution of rotating m , n = 2 , 1 tearing modes and its consequences on the stability of high-confinement-mode plasmas in DIII-D Bardóczi, L.; Richner, N. J.; Logan, N. C. Nuclear Fusion, Vol. 63, Issue 12 https://doi.org/10.1088/1741-4326/ad0488	journal	November 2023
Modelling and experiment to stabilize disruptive tearing modes in the ITER baseline scenario in DIII-D Turco, F.; Luce, T. C.; Boyes, W. Nuclear Fusion, Vol. 64, Issue 7 https://doi.org/10.1088/1741-4326/ad518e	journal	June 2024
Use of differential plasma rotation to prevent disruptive tearing mode onset from 3-wave coupling Richner, N. J.; Bardóczi, L.; Callen, J. D. Nuclear Fusion, Vol. 64, Issue 10 https://doi.org/10.1088/1741-4326/ad7273	journal	September 2024
The root cause of disruptive NTMs and paths to stable operation in DIII-D ITER baseline scenario plasmas Bardoczi, L.; Richner, N. J.; Logan, N. C. Nuclear Fusion, Vol. 64, Issue 12 https://doi.org/10.1088/1741-4326/ad7787	journal	September 2024
Scaling of Spontaneous Rotation with Temperature and Plasma Current in Tokamaks Parra, F. I.; Nave, M. F. F.; Schekochihin, A. A. Physical Review Letters, Vol. 108, Issue 9 https://doi.org/10.1103/PhysRevLett.108.095001	journal	February 2012
Intrinsic Rotation Driven by Non-Maxwellian Equilibria in Tokamak Plasmas Barnes, M.; Parra, F. I.; Lee, J. P. Physical Review Letters, Vol. 111, Issue 5 https://doi.org/10.1103/PhysRevLett.111.055005	journal	August 2013
Main-Ion Intrinsic Toroidal Rotation Profile Driven by Residual Stress Torque from Ion Temperature Gradient Turbulence in the DIII-D Tokamak Grierson, B. A.; Wang, W. X.; Ethier, S. Physical Review Letters, Vol. 118, Issue 1 https://doi.org/10.1103/PhysRevLett.118.015002	journal	January 2017
Hysteresis Relation between Turbulence and Temperature Modulation during the Heat Pulse Propagation into a Magnetic Island in DIII-D Ida, K.; Kobayashi, T.; Ono, M. Physical Review Letters, Vol. 120, Issue 24 https://doi.org/10.1103/PhysRevLett.120.245001	journal	June 2018
Experimental Observation of Magnetic Island Heteroclinic Bifurcation in Tokamaks Bardóczi, L.; Evans, T. E. Physical Review Letters, Vol. 126, Issue 8 https://doi.org/10.1103/PhysRevLett.126.085003	journal	February 2021
Neoclassical Tearing Mode Seeding by Nonlinear Three-Wave Interactions in Tokamaks Bardóczi, L.; Logan, N. C.; Strait, E. J. Physical Review Letters, Vol. 127, Issue 5 https://doi.org/10.1103/PhysRevLett.127.055002	journal	July 2021
Perturbed Ion Temperature and Toroidal Flow Profile Measurements in Rotating Neoclassical Tearing Mode Magnetic Islands Bardóczi, L.; Dudkovskaia, A.; La Haye, R. J. Physical Review Letters, Vol. 132, Issue 6 https://doi.org/10.1103/PhysRevLett.132.065107	journal	February 2024
Electron Temperature Gradient Turbulence Dorland, W.; Jenko, F.; Kotschenreuther, M. Physical Review Letters, Vol. 85, Issue 26 https://doi.org/10.1103/PhysRevLett.85.5579	journal	December 2000
Finite Larmor-Radius Theory of Magnetic Island Evolution Waelbroeck, F. L.; Connor, J. W.; Wilson, H. R. Physical Review Letters, Vol. 87, Issue 21 https://doi.org/10.1103/PhysRevLett.87.215003	journal	November 2001
Control of Neoclassical Tearing Modes by Sawtooth Control Sauter, O.; Westerhof, E.; Mayoral, M. L. Physical Review Letters, Vol. 88, Issue 10 https://doi.org/10.1103/PhysRevLett.88.105001	journal	February 2002
Role of Kinetic Effects on the Polarization Current around a Magnetic Island Poli, E.; Bergmann, A.; Peeters, A. G. Physical Review Letters, Vol. 94, Issue 20 https://doi.org/10.1103/PhysRevLett.94.205001	journal	May 2005

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