A sustained high-temperature fusion plasma regime facilitated by fast ions

Han, H.; Park, S. J.; Sung, C.; Kang, J.; Lee, Y. H.; Chung, J.; Hahm, T. S.; Kim, B.; Park, J. -K.; Bak, J. G.; Cha, M. S.; Choi, G. J.; Choi, M. J.; Gwak, J.; Hahn, S. H.; Jang, J.; Lee, K. C.; Kim, J. H.; Kim, S. K.; Kim, W. C.; Ko, J.; Ko, W. H.; Lee, C. Y.; Lee, J. H.; Lee, J. H.; Lee, J. K.; Lee, J. P.; Lee, K. D.; Park, Y. S.; Seo, J.; Yang, S. M.; Yoon, S. W.; Na, Y. -S.

doi:10.1038/s41586-022-05008-1

Title: A sustained high-temperature fusion plasma regime facilitated by fast ions

Journal Article · Wed Sep 07 00:00:00 EDT 2022 · Nature (London)

DOI:https://doi.org/10.1038/s41586-022-05008-1· OSTI ID:1889862

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^[3]; Kang, J. ^[1]; Lee, Y. H. ^[4]; Chung, J. ^[1]; Hahm, T. S. ^[2]; Kim, B. ^[2];

^[5]; Bak, J. G. ^[1]; Cha, M. S. ^[2]; Choi, G. J. ^[2];

^[1]; Gwak, J. ^[2];

^[1]; Jang, J. ^[1]; Lee, K. C. ^[1];

^[1]; Kim, S. K. ^[6]; Kim, W. C. ^[1] more »

Korea Institute of Fusion Energy, Daejeon (Korea, Republic of)
Seoul National Univ. (Korea, Republic of)
Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Korea Institute of Fusion Energy, Daejeon (Korea, Republic of); Seoul National Univ. (Korea, Republic of)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Korea Institute of Fusion Energy, Daejeon (Korea, Republic of); Korean University of Science and Technology, Daejeon (Korea, Republic of)
Hanyang Univ., Seoul (Korea, Republic of)
Columbia Univ., New York, NY (United States)

Nuclear fusion is one of the most attractive alternatives to carbon-dependent energy sources. Harnessing energy from nuclear fusion in a large reactor scale, however, still presents many scientific challenges despite the many years of research and steady advances in magnetic confinement approaches. State-of-the-art magnetic fusion devices cannot yet achieve a sustainable fusion performance, which requires a high temperature above 100 million kelvin and sufficient control of instabilities to ensure steady-state operation on the order of tens of seconds. Here, in this study, we report experiments at the Korea Superconducting Tokamak Advanced Research device producing a plasma fusion regime that satisfies most of the above requirements: thanks to abundant fast ions stabilizing the core plasma turbulence, we generate plasmas at a temperature of 100 million kelvin lasting up to 20 seconds without plasma edge instabilities or impurity accumulation. A low plasma density combined with a moderate input power for operation is key to establishing this regime by preserving a high fraction of fast ions. This regime is rarely subject to disruption and can be sustained reliably even without a sophisticated control, and thus represents a promising path towards commercial fusion reactors.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; National Research Foundation of Korea (NRF); Korea Institute of Fusion Energy (KFE)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1889862

Journal Information:: Nature (London), Vol. 609, Issue 7926; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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