Integration of full divertor detachment with improved core confinement for tokamak fusion plasmas

Wang, L.; Wang, H. Q.; Ding, S.; Garofalo, A. M.; Gong, X. Z.; Eldon, D.; Guo, H. Y.; Leonard, A. W.; Hyatt, A. W.; Qian, J. P.; Weisberg, D. B.; McClenaghan, J.; Fenstermacher, M. E.; Lasnier, C. J.; Watkins, J. G.; Shafer, M. W.; Xu, G. S.; Huang, J.; Ren, Q. L.; Buttery, R. J.; Humphreys, D. A.; Thomas, D. M.; Zhang, B.; Liu, J. B.

doi:10.1038/s41467-021-21645-y

Title: Integration of full divertor detachment with improved core confinement for tokamak fusion plasmas

Journal Article · Mon Mar 01 00:00:00 EST 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-21645-y· OSTI ID:1768382

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^[2]; Gong, X. Z. ^[1];

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^[2]; Hyatt, A. W. ^[2]; Qian, J. P. ^[1]; Weisberg, D. B. ^[2]; McClenaghan, J. ^[2]; Fenstermacher, M. E. ^[4]; Lasnier, C. J. ^[4]; Watkins, J. G. ^[5];

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^[1]; Huang, J. ^[1]; Ren, Q. L. ^[1]; Buttery, R. J. ^[2] more »

Chinese Academy of Sciences (CAS), Hefei (China)
General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Divertor detachment offers a promising solution to the challenge of plasma-wall interactions for steady-state operation of fusion reactors. Here, we demonstrate the excellent compatibility of actively controlled full divertor detachment with a high-performance (βN ~ 3, H98 ~ 1.5) core plasma, using high-βp (poloidal beta, βp > 2) scenario characterized by a sustained core internal transport barrier (ITB) and a modest edge transport barrier (ETB) in DIII-D tokamak. The high-βp high-confinement scenario facilitates divertor detachment which, in turn, promotes the development of an even stronger ITB at large radius with a weaker ETB. This self-organized synergy between ITB and ETB, leads to a net gain in energy confinement, in contrast to the net confinement loss caused by divertor detachment in standard H-modes. These results show the potential of integrating excellent core plasma performance with an efficient divertor solution, an essential step towards steady-state operation of reactor-grade plasmas.

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Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA); National Magnetic Confinement Fusion Science Program of China

Grant/Contract Number:: FC02-04ER54698; AC04-94AL85000; NA0003525; AC52-07NA27344; SC0010685; 2017YFE0301300; 2017YFE0300404

OSTI ID:: 1768382

Alternate ID(s):: OSTI ID: 1845144; OSTI ID: 1871402

Report Number(s):: LLNL-JRNL-834527; TRN: US2206592

Journal Information:: Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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