A sustained high-temperature fusion plasma regime facilitated by fast ions
- Authors
- 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
- Issue Date
- Sep-2022
- Publisher
- NATURE PORTFOLIO
- Citation
- NATURE, v.609, no.7926, pp.269 - 275
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE
- Volume
- 609
- Number
- 7926
- Start Page
- 269
- End Page
- 275
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/187561
- DOI
- 10.1038/s41586-022-05008-1
- ISSN
- 0028-0836
- Abstract
- Nuclear fusion is one of the most attractive alternatives to carbon-dependent energy sources(1). 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(2,3). Here we report experiments at the Korea Superconducting Tokamak Advanced Research(4) 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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