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1.	Fenstermacher, M.E., et al. (author) DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy 2022 In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 62:4 Journal article (peer-reviewed)abstract DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, coupled with fundamental plasma physics understanding and model validation, to drive scenario development by integrating high performance core and boundary plasmas. Substantial increases in off-axis current drive efficiency from an innovative top launch system for EC power, and in pressure broadening for Alfven eigenmode control from a co-/counter-I p steerable off-axis neutral beam, all improve the prospects for optimization of future long pulse/steady state high performance tokamak operation. Fundamental studies into the modes that drive the evolution of the pedestal pressure profile and electron vs ion heat flux validate predictive models of pedestal recovery after ELMs. Understanding the physics mechanisms of ELM control and density pumpout by 3D magnetic perturbation fields leads to confident predictions for ITER and future devices. Validated modeling of high-Z shattered pellet injection for disruption mitigation, runaway electron dissipation, and techniques for disruption prediction and avoidance including machine learning, give confidence in handling disruptivity for future devices. For the non-nuclear phase of ITER, two actuators are identified to lower the L-H threshold power in hydrogen plasmas. With this physics understanding and suite of capabilities, a high poloidal beta optimized-core scenario with an internal transport barrier that projects nearly to Q = 10 in ITER at ∼8 MA was coupled to a detached divertor, and a near super H-mode optimized-pedestal scenario with co-I p beam injection was coupled to a radiative divertor. The hybrid core scenario was achieved directly, without the need for anomalous current diffusion, using off-axis current drive actuators. Also, a controller to assess proximity to stability limits and regulate β N in the ITER baseline scenario, based on plasma response to probing 3D fields, was demonstrated. Finally, innovative tokamak operation using a negative triangularity shape showed many attractive features for future pilot plant operation.
2.	Modestov, Mikhail, et al. (author) Electromagnetic control of heat transport within a rectangular channel filled with flowing liquid metal 2018 In: Nuclear Fusion. - : IOP PUBLISHING LTD. - 0029-5515 .- 1741-4326. ; 58:1 Journal article (peer-reviewed)abstract The behavior of free-surface, liquid-metal flows exposed to both magnetic fields and an injected electric current is investigated via experiment and numerical simulations. The purpose of this paper is to provide an experimental and theoretical proof-of-concept for enhanced thermal mixing within fast-flowing, free-surface, liquid-metal plasma facing components that could be used in next-generation fusion reactors. The enhanced hydrodynamic and thermal mixing induced by non-uniform current density near the electrodes appears to improve heat transfer through the thickness of the flowing metal. Also, the outflow heat flux profile is strongly affected by the impact of the J x B forces on flow velocity. The experimental results are compared to COMSOL simulations in order to lay the groundwork for future liquid-metal research.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Liu, X (1); Hansen, E. (1); Chen, X. (1); Huang, Y. (1); Izzo, V. (1); Ji, H. (1); show more...; King, M. (1); Kobayashi, T. (1); Li, L. (1); Li, Y. (1); Liu, D. (1); Liu, Y. (1); Nelson, A. (1); Qian, J. (1); Su, D. (1); Suzuki, Y. (1); Wang, H. (1); White, R. (1); Wu, M. (1); Wu, Y. (1); Yan, Z. (1); Yu, J. (1); Zhang, J. (1); Zhang, L. (1); Zhang, X. (1); Zhu, J. (1); Zhu, Y. (1); Hu, Q. (1); Liu, J. (1); Zhang, R. (1); Brown, G. (1); Li, X. (1); Xu, C. (1); Zhao, L. (1); Liu, C. (1); Smith, D. (1); Banerjee, S. (1); Liu, T. (1); Han, H. (1); Hill, D. (1); Li, J. (1); Robinson, J. (1); Yu, M. (1); Ren, Y. (1); Park, J (1); Wei, Y. (1); Adams, M. (1); Kim, H. S. (1); Yang, S. (1); Hu, Y. (1); show less...

University: Royal Institute of Technology (2); Stockholm University (1); Chalmers University of Technology (1)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2); Engineering and Technology (1)

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