Advances in physics understanding of high poloidal beta regime toward steady-state operation of CFETR

Qian, J. P.; Garofalo, A. M.; Gong, X. Z.; Huang, J.; Ding, S. Y.; Holcomb, C. T.; Hyatt, A.; Ferron, J.; McClenaghan, J.; McKee, G.; Kotschenreuther, M.; Wu, M. Q.; Shi, S. Y.; Li, M. H.; Zhu, X.; Sun, Y. W.; Xu, G. S.; Wang, L.; Chen, J. L.; Zang, Q.; Zhang, B.; Zhang, L.; Liu, H. Q.; Lyu, B.; Guo, W. F.; Pan, C. K.; Ren, Q.; Li, G. Q.; Wang, H. Q.; Zhang, X. J.; Pinsker, R. I.; Staebler, G. M.; Lao, L. L.

doi:10.1063/5.0032490

Title: Advances in physics understanding of high poloidal beta regime toward steady-state operation of CFETR

Journal Article · Thu Apr 15 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0032490· OSTI ID:1783781

^[1]; Garofalo, A. M. ^[2]; Gong, X. Z. ^[1]; Huang, J. ^[1];

^[3]; Holcomb, C. T. ^[4]; Hyatt, A. ^[2]; Ferron, J. ^[2]; McClenaghan, J. ^[2];

^[5]; Kotschenreuther, M. ^[6];

^[1]; Shi, S. Y. ^[7]; Li, M. H. ^[1];

^[1];

^[1]; Wang, L. ^[1];

^[1];

^[1] more »

Chinese Academy of Sciences, Anhui (China)
General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences, Anhui (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of Texas, Austin, TX (United States)
Univ. of Science and Technology of China, Anhui (China)

Experimental and modeling investigations of the high βp scenarios on the DIII-D and EAST tokamaks show advantages in high energy confinement, avoidance of n = 1 MHD, and core-edge integration with reduced heat flux, making this scenario an attractive option for CFETR steady-state operation. Experiments show that plasmas with high confinement and high density can be achieved with neutral beam injection on DIII-D (β_p ~ 2.2, β_N ~ 3.5, f_BS ~ 50%, f_Gw ~ 1.0, H_98y2 ~ 1.5) and pure RF power on EAST (β_P ~ 2.0, β_N ~ 1.6, f_BS ~ 50%, f_Gw ~ 0.8, H_98y2 > 1.3). By tailoring the current density profile, a q-profile with local (off-axis) negative shear is achieved that yields improved confinement and MHD stability. Transport analysis and simulation suggest that the combination of high density gradient and high Shafranov shift allows turbulence stabilization and higher confinement. Using on-axis ECH injection, tungsten accumulation is avoided on EAST, and this is reproduced in modeling. Reduced heat flux (by >40%) and maintenance of high core confinement is achieved with active feedback control of the radiated divertor, an important result for long pulse operation in tokamaks. In conclusion, the improved physics understanding and validated modeling tools are used to design a 1GW steady-state scenario for CFETR.

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

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FC02-04ER54698; 11975274; 11975276; AC52-07NA27344; 2019YFE03040000; 2019YFE03020004

OSTI ID:: 1783781

Alternate ID(s):: OSTI ID: 1777619; OSTI ID: 1845202

Report Number(s):: LLNL-JRNL-830751; TRN: US2210143

Journal Information:: Physics of Plasmas, Vol. 28, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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