Integrated operation of steady-state long-pulse H-mode in Experimental Advanced Superconducting Tokamak

Gong, X.; Garofalo, A. M.; Huang, J.; Qian, J.; Holcomb, C. T.; Ekedah, A.; Maingi, R.; Li, E.; Zeng, L.; Zhang, B.; Chen, J.; Wu, M.; Du, H.; Li, M.; Zhu, X.; Sun, Y.; Xu, G.; Zang, Q.; Wang, L.; Zhang, L.; Liu, H.; Lyu, B.; Sun, P.; Ding, S.; Zhang, X.; Liu, F.; Zhao, Y.; Xiao, B.; Hu, J.; Hu, C.; Hu, L.; Li, J.; Wan, B.

doi:10.1088/1741-4326/ab1c7b

Title: Integrated operation of steady-state long-pulse H-mode in Experimental Advanced Superconducting Tokamak

Journal Article · Mon Jul 01 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab1c7b· OSTI ID:1798017

Gong, X. ^[1];

^[2]; Huang, J. ^[1]; Qian, J. ^[1]; Holcomb, C. T. ^[3]; Ekedah, A. ^[4]; Maingi, R. ^[5]; Li, E. ^[1];

^[1]; Zhang, B. ^[1];

^[1];

^[1]; Du, H. ^[1];

^[1]; Zhu, X. ^[1];

^[1]; Xu, G. ^[1]; Zang, Q. ^[1]; Wang, L. ^[1]; Zhang, L. ^[1] more »

Chinese Academy of Sciences (CAS), Hefei (China). Institute of Plasma Physics
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Alternative Energies and Atomic Energy Commission (CEA), Saint Paul-lez-Durance (France)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Recent Experimental Advanced Superconducting Tokamak (EAST) experiments have successfully demonstrated a long-pulse steady-state scenario with improved plasma performance through integrated operation since the last IAEA FEC in 2016. A discharge with a duration over 100 s using pure radio frequency (RF) power heating and current drive has been obtained with the required characteristics for future long-pulse tokamak reactors such as good energy confinement quality (H_98y2 ~ 1.1) with electron internal transport barrier inside ρ < 0.4, small ELMs (frequency ~100–200 Hz), and good control of impurity and heat exhaust with the tungsten divertor. The optimization of X-point, plasma shape, the outer gap and local gas puffing near the low hybrid wave (LHW) antenna were integrated with global parameters of BT and line-averaged electron density for higher current drive efficiency of LHW and on-axis deposition of electron cyclotron heating in the long-pulse operation. More recently, a high βP RF-only discharge (β_P ~ 1.9 and β_N ~ 1.5, $$\langle$$n_e$$\rangle$$/n_GW ~ 0.80, f_bs ~ 45% at q₉₅ ~ 6.8) was successfully maintained over 24 s with improved hardware capabilities, demonstrating performance levels needed for the China Fusion Engineering Test Reactor steady-state operation. In this work, a higher energy confinement is observed at higher β_P and with favorable toroidal field direction. Towards the next goal (≥400 s long-pulse H-mode operations with ~50% bootstrap current fraction) on EAST, an integrated control of the current density profile, pressure profile and radiated divertor will be addressed in the near future.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Magnetic Confinement Fusion Program of China; Chinese Academy of Sciences (CAS); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); National Nature Science Foundation of China

Contributing Organization:: EAST Team

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1798017

Alternate ID(s):: OSTI ID: 1511460

Report Number(s):: LLNL-JRNL-777065; 966470; TRN: US2210645

Journal Information:: Nuclear Fusion, Vol. 59, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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27th IAEA Fusion Energy Conference: summary of sessions EX/C, EX/S and PPC Campbell, D. J. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5cee	journal	January 2020
Improved high-performance fully non-inductive discharge by optimizing the fast-ion confinement on EAST Huang, J.; Qian, J. P.; Garofalo, A. M. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab443a	journal	October 2019