Plasma performance and operational space with an RMP-ELM suppressed edge

Paz-Soldan, C.; Gu, S.; Leuthold, N.; Lunia, P.; Xie, P.; Kim, M. W.; Kim, S. K.; Logan, N. C.; Park, J. -K.; Suttrop, W.; Sun, Y.; Weisberg, D. B.; Willensdorfer, M.

doi:10.1088/1741-4326/ad6014

Title: Plasma performance and operational space with an RMP-ELM suppressed edge

Journal Article · 23 July 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad6014 · OSTI ID:2406088

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Abstract The operational space and global performance of plasmas with edge-localized modes (ELMs) suppressed by resonant magnetic perturbations (RMPs) are surveyed by comparing AUG, DIII-D, EAST, and KSTAR stationary operating points. RMP-ELM suppression is achieved over a range of plasma currents, toroidal fields, and RMP toroidal mode numbers. Consistent operational windows in edge safety factor are found across devices, while windows in plasma shaping parameters are distinct. Accessed pedestal parameters reveal a quantitatively similar pedestal-top density limit for RMP-ELM suppression in all devices of just over $3 \times 10^{19}$ m ⁻³ . This is surprising given the wide variance of many engineering parameters and edge collisionalities, and poses a challenge to extrapolation of the regime. Wide ranges in input power, confinement time, and stored energy are observed, with the achieved triple product found to scale like the product of current, field, and radius. Observed energy confinement scaling with engineering parameters for RMP-ELM suppressed plasmas are presented and compared with expectations from established H and L-mode scalings, including treatment of uncertainty analysis. Different scaling exponents for individual engineering parameters are found as compared to the established scalings. However, extrapolation to next-step tokamaks ITER and SPARC find overall consistency within uncertainties with the established scalings, finding no obvious performance penalty when extrapolating from the assembled multi-device RMP-ELM suppressed database. Overall this work identifies common physics for RMP-ELM suppression and highlights the need to pursue this no-ELM regime at higher magnetic field and different plasma physical size.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 2406088

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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Integrated RMP-based ELM-crash-control process for plasma performance enhancement during ELM crash suppression in KSTAR Kim, Minwoo; Shin, G.; Lee, J. Nuclear Fusion, Vol. 63, Issue 8 https://doi.org/10.1088/1741-4326/ace460	journal	July 2023
Extension of ELM suppression window using n=4 RMPs in EAST Xie, P.; Sun, Y.; Ma, Q. Nuclear Fusion, Vol. 63, Issue 9 https://doi.org/10.1088/1741-4326/aceb07	journal	August 2023
Development of high-performance long-pulse discharge in KSTAR Kim, Hyun-Seok; Jeon, YoungMu; Han, Hyunsun Nuclear Fusion, Vol. 64, Issue 1 https://doi.org/10.1088/1741-4326/ad0fbd	journal	December 2023
Power requirement for accessing the H-mode in ITER Martin, Y. R.; Takizuka, T.; Group, the ITPA CDBM H-mode Threshold Data Journal of Physics: Conference Series, Vol. 123 https://doi.org/10.1088/1742-6596/123/1/012033	journal	July 2008
On Demand Triggering of Edge Localized Instabilities Using External Nonaxisymmetric Magnetic Perturbations in Toroidal Plasmas Canik, J. M.; Maingi, R.; Evans, T. E. Physical Review Letters, Vol. 104, Issue 4 https://doi.org/10.1103/PhysRevLett.104.045001	journal	January 2010
First Observation of Edge Localized Modes Mitigation with Resonant and Nonresonant Magnetic Perturbations in ASDEX Upgrade Suttrop, W.; Eich, T.; Fuchs, J. C. Physical Review Letters, Vol. 106, Issue 22 https://doi.org/10.1103/PhysRevLett.106.225004	journal	June 2011
Observation of Lobes near the X Point in Resonant Magnetic Perturbation Experiments on MAST Kirk, A.; Harrison, J.; Liu, Yueqiang Physical Review Letters, Vol. 108, Issue 25 https://doi.org/10.1103/PhysRevLett.108.255003	journal	June 2012
Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations Jeon, Y. M.; Park, J. -K.; Yoon, S. W. Physical Review Letters, Vol. 109, Issue 3 https://doi.org/10.1103/PhysRevLett.109.035004	journal	July 2012
Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression Paz-Soldan, C.; Nazikian, R.; Haskey, S. R. Physical Review Letters, Vol. 114, Issue 10 https://doi.org/10.1103/PhysRevLett.114.105001	journal	March 2015
Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak Nazikian, R.; Paz-Soldan, C.; Callen, J. D. Physical Review Letters, Vol. 114, Issue 10 https://doi.org/10.1103/PhysRevLett.114.105002	journal	March 2015
Nonlinear Interaction of Edge-Localized Modes and Turbulent Eddies in Toroidal Plasma under n = 1 Magnetic Perturbation Lee, Jaehyun; Yun, Gunsu S.; Choi, Minjun J. Physical Review Letters, Vol. 117, Issue 7 https://doi.org/10.1103/PhysRevLett.117.075001	journal	August 2016
Nonlinear Transition from Mitigation to Suppression of the Edge Localized Mode with Resonant Magnetic Perturbations in the EAST Tokamak Sun, Y.; Liang, Y.; Liu, Y. Q. Physical Review Letters, Vol. 117, Issue 11 https://doi.org/10.1103/PhysRevLett.117.115001	journal	September 2016
Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks Willensdorfer, M.; Cote, T. B.; Hegna, C. C. Physical Review Letters, Vol. 119, Issue 8 https://doi.org/10.1103/PhysRevLett.119.085002	journal	August 2017
Wide Operational Windows of Edge-Localized Mode Suppression by Resonant Magnetic Perturbations in the DIII-D Tokamak Hu, Q. M.; Nazikian, R.; Grierson, B. A. Physical Review Letters, Vol. 125, Issue 4 https://doi.org/10.1103/PhysRevLett.125.045001	journal	July 2020
Dependence of Heat and Particle Transport on the Ratio of the Ion and Electron Temperatures Petty, C. C.; Wade, M. R.; Kinsey, J. E. Physical Review Letters, Vol. 83, Issue 18 https://doi.org/10.1103/PhysRevLett.83.3661	journal	November 1999
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Design of the ITER In-Vessel Coils Neumeyer, C.; Brooks, A.; Bryant, L. Fusion Science and Technology, Vol. 60, Issue 1 https://doi.org/10.13182/FST11-A12333	journal	July 2011
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