Long-pulse high-performance H-mode plasmas achieved on EAST

Huang, J.; Gong, X.; Garofalo, A. M.; Qian, J.; Ding, R.; Zhang, X. J.; Chen, J. L.; Li, M. H.; Yu, Y. W.; Wang, Y. F.; Huang, Y.; Si, H.; Meng, L. Y.; Jia, T. Q.; Sun, Y. X.; Zeng, L.; Han, L.; Duan, Y. M.; Ekedahl, A.; Holcomb, C. T.; Maingi, R.; Li, E. Z.; Liu, H. Q.; Lyu, B.; Ren, Q. L.; Sun, Y. W.; Wang, L.; Xu, L. Q.; Yao, D. M.; Yang, Q. Q.; Zang, Q.; Zhang, B.; Zhang, L.; Zhai, X. M.; Zuo, G. Z.; Li, G. Q.; Zi, P. F.; Wang, M.; Xu, H. D.; Yuan, Q. P.; Xie, Y. H.; Huang, L. S.; Zhang, J.; Hu, Y. L.; Xi, W. B.; Zhou, Z. W.; Wang, Z. C.; Guo, B.; Xu, G. S.; Hu, J. S.; Lu, K.; Song, Y. T.; Wan, B. N.; Li, J.

doi:10.1063/5.0146690

Title: Long-pulse high-performance H-mode plasmas achieved on EAST

Journal Article · Thu Jun 08 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0146690· OSTI ID:1986331

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Chinese Academy of Sciences (CAS), Hefei (China)
General Atomics, San Diego, CA (United States)
CEA, IRFM, Saint Paul Lez Durance (France)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

A record duration of a 310 s H-mode plasma (H_98y2 ~ 1.3, n_e/n_GW ~ 0.7, f_BS > 50%) has been recently achieved on experimental advanced superconducting tokamak (EAST) with metal walls, exploiting the device's improved long-pulse capabilities. The experiment demonstrates good control of tungsten concentration, core/edge MHD stability, and particle and heat exhaust with an ITER-like tungsten divertor and zero injected torque, establishing a milestone on the path to steady-state long-pulse high-performance scenarios in support of ITER and CFETR. Important synergistic effects are leveraged toward this result, which relies purely on radio frequency (RF) powers for heating and current drive (H&CD). On-axis electron cyclotron heating enhances the H&CD efficiency from lower hybrid wave injection, increasing confinement quality and enabling fully non-inductive operation at high density (n_e/n_GW ~ 70%) and high poloidal beta (β_P ~ 2.5). A small-amplitude grassy edge localized mode regime facilitates the RF power coupling to the H-mode edge and reduces divertor sputtering/erosion. The high energy confinement quality (H_98y2 ~ 1.3) is achieved with the experimental and simulated results pointing to the strong effect of Shafranov shift on turbulence. Transport analysis suggests that trapped electron modes dominate in the core region during the record discharge. The detailed physics processes (RF synergy, core-edge integration, confinement properties, etc.) of the steady-state operation will be illustrated in the content. In the future, EAST will aim at accessing more relevant dimensionless parameters to develop long-pulse high-performance plasma toward ITER and CFETR steady-state advanced operation.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)

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

Contributing Organization:: EAST team

Grant/Contract Number:: FC02-04ER54698; SC0010685; SC0014264; AC52-07NA27344; AC02-09CH11466

OSTI ID:: 1986331

Alternate ID(s):: OSTI ID: 2205297; OSTI ID: 2287652

Report Number(s):: LLNL-JRNL-855773; 2019YFE03020004; 202104b11020003; 2021HSC-UE015; 11975276; 2008085J04; TRN: US2402753

Journal Information:: Physics of Plasmas, Vol. 30, Issue 6; Conference: 64. Annual Meeting of the APS Division of Plasma Physics, Spokane, WA (United States), 17-21 Oct 2022; Related Information: https://pubs.aip.org/pop/collection/1572/Papers-from-the-64th-Annual-Meeting-of-the-APS; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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