NSTX-U research advancing the physics of spherical tokamaks

Berkery, J. W.; Adebayo-Ige, P. O.; Al Khawaldeh, H.; Avdeeva, G.; Baek, S-G.; Banerjee, S.; Barada, K.; Battaglia, D. J.; Bell, R. E.; Belli, E.; Belova, E. V.; Bertelli, N.; Bisai, N.; Bonoli, P. T.; Boyer, M. D.; Butt, J.; Candy, J.; Chang, C. S.; Clauser, C. F.; Corona Rivera, L. D.; Curie, M.; de Vries, P. C.; Diab, R.; Diallo, A.; Dominski, J.; Duarte, V. N.; Emdee, E. D.; Ferraro, N. M.; Fitzpatrick, R.; Foley, E. L.; Fredrickson, E.; Galante, M. E.; Gan, K. F.; Gerhardt, S.; Goldston, R.; Guttenfelder, W.; Hager, R.; Hanson, M. O.; Jardin, S. C.; Jenkins, T. G.; Kaye, S. M.; Khodak, A.; Kinsey, J.; Kleiner, A.; Kolemen, E.; Ku, S.; Lampert, M.; Leard, B.; LeBlanc, B. P.; Lestz, J. B.; Levinton, F. M.; Liu, C.; Looby, T.; Lunsford, R.; Macwan, T.; Maingi, R.; McClenaghan, J.; Menard, J. E.; Munaretto, S.; Ono, M.; Pajares, A.; Parisi, J.; Park, J-K.; Parsons, M. S.; Patel, B. S.; Petrov, Y. V.; Podestà, M.; Poli, F.; Porcelli, M.; Rafiq, T.; Sabbagh, S. A.; Sánchez Villar, Á.; Schuster, E.; Schwartz, J.; Sharma, A.; Shiraiwa, S.; Sinha, P.; Smith, D.; Smith, S.; Soukhanovskii, V. A.; Staebler, G.; Startsev, E.; Stratton, B.; Thome, K. E.; Tierens, W.; Tobin, M.; Uzun-Kaymak, I. U.; Van Compernolle, B.; Wai, J.; Wang, W.; Wehner, W.; Welander, A.; Yang, J.; Zamkovska, V.; Zhang, X.; Zhu, X. L.; Zweben, S.

doi:10.1088/1741-4326/ad3092

Title: NSTX-U research advancing the physics of spherical tokamaks

Journal Article · 15 August 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad3092 · OSTI ID:2429628

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; Boyer, M. D.;

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Abstract The objectives of NSTX-U research are to reinforce the advantages of STs while addressing the challenges. To extend confinement physics of low- A , high beta plasmas to lower collisionality levels, understanding of the transport mechanisms that set confinement performance and pedestal profiles is being advanced through gyrokinetic simulations, reduced model development, and comparison to NSTX experiment, as well as improved simulation of RF heating. To develop stable non-inductive scenarios needed for steady-state operation, various performance-limiting modes of instability were studied, including MHD, tearing modes, and energetic particle instabilities. Predictive tools were developed, covering disruptions, runaway electrons, equilibrium reconstruction, and control tools. To develop power and particle handling techniques to optimize plasma exhaust in high performance scenarios, innovative lithium-based solutions are being developed to handle the very high heat flux levels that the increased heating power and compact geometry of NSTX-U will produce, and will be seen in future STs. Predictive capabilities accounting for plasma phenomena, like edge harmonic oscillations, ELMs, and blobs, are being tested and improved. In these ways, NSTX-U researchers are advancing the physics understanding of ST plasmas to maximize the benefit that will be gained from further NSTX-U experiments and to increase confidence in projections to future devices.

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2429628

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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Neoclassical transport due to resonant magnetic perturbations in DIII-D Sinha, Priyanjana; Ferraro, Nathaniel M.; Belli, Emily Nuclear Fusion, Vol. 62, Issue 12 https://doi.org/10.1088/1741-4326/ac948b	journal	October 2022
3D full wave fast wave modeling with realistic HHFW antenna geometry and SOL plasma in NSTX-U Bertelli, N.; Shiraiwa, S.; Ono, M. Nuclear Fusion, Vol. 62, Issue 12 https://doi.org/10.1088/1741-4326/ac9690	journal	October 2022
Extension of the energetic particle transport kick model in TRANSP to multiple fast ion species Podestà, M.; Gorelenkova, M.; Teplukhina, A. A. Nuclear Fusion, Vol. 62, Issue 12 https://doi.org/10.1088/1741-4326/ac99ee	journal	November 2022
Magnetic potential based formulation for linear and non-linear 3D RF sheath simulation Shiraiwa, S.; Bertelli, N.; Tierens, W. Nuclear Fusion, Vol. 63, Issue 2 https://doi.org/10.1088/1741-4326/aca6f9	journal	January 2023
Cross-machine comparison of runaway electron generation during tokamak start-up for extrapolation to ITER de Vries, P. C.; Lee, Y.; Gribov, Y. Nuclear Fusion, Vol. 63, Issue 8 https://doi.org/10.1088/1741-4326/acdd11 086016	journal	June 2023
The effect of gas injection location on a lithium vapor box divertor in NSTX-U Emdee, E. D.; Goldston, R. J. Nuclear Fusion, Vol. 63, Issue 9 https://doi.org/10.1088/1741-4326/ace6be	journal	July 2023
Energy transport analysis of NSTX plasmas with the TGLF turbulent and NEO neoclassical transport models Avdeeva, G.; Thome, K. E.; Smith, S. P. Nuclear Fusion, Vol. 63, Issue 12 https://doi.org/10.1088/1741-4326/acfc56	journal	October 2023
DECAF cross-device characterization of tokamak disruptions indicated by abnormalities in plasma vertical position and current Zamkovska, V.; Sabbagh, S. A.; Tobin, M. Nuclear Fusion, Vol. 64, Issue 6, p. 066030 https://doi.org/10.1088/1741-4326/ad3fca	journal	May 2024
Predictive modeling of NSTX discharges with the updated multi-mode anomalous transport module Rafiq, T.; Wilson, C.; Clauser, C. Nuclear Fusion, Vol. 64, Issue 7 https://doi.org/10.1088/1741-4326/ad4d01 076024	journal	June 2024
Optimization of lithium vapor box divertor evaporator location on NSTX-U using SOLPS-ITER Emdee, E. D.; Goldston, R. J.; Khodak, A. Nuclear Fusion, Vol. 64, Issue 8, 086047 https://doi.org/10.1088/1741-4326/ad57d2	journal	July 2024
Multiple timescale calculations of sawteeth and other global macroscopic dynamics of tokamak plasmas Jardin, S. C.; Ferraro, N.; Breslau, J. Computational Science & Discovery, Vol. 5, Issue 1 https://doi.org/10.1088/1749-4699/5/1/014002	journal	January 2012
Compact steady-state tokamak performance dependence on magnet and core physics limits Menard, J. E. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2141 https://doi.org/10.1098/rsta.2017.0440	journal	February 2019
Correlation between Electron Transport and Shear Alfvén Activity in the National Spherical Torus Experiment Stutman, D.; Delgado-Aparicio, L.; Gorelenkov, N. Physical Review Letters, Vol. 102, Issue 11 https://doi.org/10.1103/PhysRevLett.102.115002	journal	March 2009
Suppression of Electron Temperature Gradient Turbulence via Negative Magnetic Shear in NSTX Yuh, H. Y.; Kaye, S. M.; Levinton, F. M. Physical Review Letters, Vol. 106, Issue 5 https://doi.org/10.1103/PhysRevLett.106.055003	journal	February 2011
Origin of Tokamak Density Limit Scalings Gates, D. A.; Delgado-Aparicio, L. Physical Review Letters, Vol. 108, Issue 16 https://doi.org/10.1103/PhysRevLett.108.165004	journal	April 2012
First-Principles Density Limit Scaling in Tokamaks Based on Edge Turbulent Transport and Implications for ITER Giacomin, M.; Pau, A.; Ricci, P. Physical Review Letters, Vol. 128, Issue 18 https://doi.org/10.1103/PhysRevLett.128.185003	journal	May 2022
Ideal MHD Limited Electron Temperature in Spherical Tokamaks Jardin, S. C.; Ferraro, N. M.; Guttenfelder, W. Physical Review Letters, Vol. 128, Issue 24 https://doi.org/10.1103/PhysRevLett.128.245001	journal	June 2022
Shifting and Splitting of Resonance Lines due to Dynamical Friction in Plasmas Duarte, V. N.; Lestz, J. B.; Gorelenkov, N. N. Physical Review Letters, Vol. 130, Issue 10 https://doi.org/10.1103/PhysRevLett.130.105101	journal	March 2023
Scaling of Electron and Ion Transport in the High-Power Spherical Torus NSTX Kaye, S. M.; Bell, R. E.; Gates, D. Physical Review Letters, Vol. 98, Issue 17 https://doi.org/10.1103/PhysRevLett.98.175002	journal	April 2007
Virtual Tokamak for Test and Development of Plasma Control Applied to NSTX-U Welander, Anders S.; Wehner, William P.; Pajares, Andres IEEE Transactions on Plasma Science https://doi.org/10.1109/TPS.2024.3417854	journal	January 2024

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