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Title: Integrated operation of steady-state long pulse H-mode in EAST

Abstract

Recent EAST experiment has successfully exhibited long-pulse steady-state scenario with improved plasma performance through the integrated operation since the last IAEA FEC in 2016. A discharge with a duration over 100s using pure RF power H&CD has been obtained with the required characteristics for future long pulse tokamak reactors such as good energy confinement quality (H 98y2 ~ 1.1) with eITB inside $$\square$$$\square$$< 0.4, small ELMs (frequency ~100-200 Hz), 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 LHW antenna were integrated with global parameters of BT and line averaged electron density <ne> for higher current drive efficiency of LHW and on-axis deposition of ECH in the long pulse operation. More recently, a high β P RF-only discharge (βP~1.9 & β N~1.5, <ne>/n GW~0.80, f bs~45% at q 95~6.8) was successfully maintained over 24s with improved hardware capabilities, demonstrating performance levels needed for CFETR steady-state operation. A higher energy confinement is observed at higher β P and with favourable toroidal field direction. Towards the next goal (≥ 400s long-pulse H-mode operations with ~50% bootstrap current fraction) on EAST, an integrated control of current density profile, pressure profile and the radiated divertor will be presented in the near future.

Authors:
 [1]; ORCiD logo [2];  [3];  [3];  [4];  [5];  [6];  [3]; ORCiD logo [3];  [3]; ORCiD logo [3]; ORCiD logo [7];  [3]; ORCiD logo [3];  [8]; ORCiD logo [3];  [3];  [3];  [3];  [3] more »;  [3];  [3]; ORCiD logo [3];  [3];  [3];  [3];  [3];  [3];  [9];  [3];  [3];  [3];  [3] « less
  1. Chinese Academy of Sciences (CAS), Hefei (China). Inst.of Plasma Physics
  2. General Atomics, San Diego, CA (United States)
  3. Chinese Academy of Sciences (CAS), Hefei (China). Inst.of Plasma Physics
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. French Alternatives Energies and Atomic Energy Commission (CEA), Saint Paul-lez-Durance (France). Inst. for Magnetic Fusion Research (IRFM)
  6. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  7. Shenzhen Univ., Shenzhen (China)
  8. Univ. of Science and Technology of China, Hefei (China)
  9. Chinese Academy of Sciences (CAS), Hefei (China). Hefei Inst. of Physical Sciences
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; National Magnetic Confinement Fusion Program of China; National Key Research and Development Program of China; National Nature Science Foundation of China
OSTI Identifier:
1511460
Grant/Contract Number:  
2015GB102000; 2015GB103000; Y85FZ10132; 11625524; 2017YFA0402500
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 8; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Gong, Xianzu, Garofalo, Andrea M., Huang, Juan, Qian, Jinping, Holcomb, Chris T., Ekedahl, Annika, Maingi, Rajesh, Li, Erzhong, Zeng, Long, Zhang, Bin, Chen, Jiale, Wu, Muquan, Du, Hongfei, Li, Miaohui, Zhu, Xiang, Sun, Youwen, Xu, Guosheng, Zang, Qing, Wang, Liang, Zhang, Ling, Liu, Haiqing, Lyu, Bo, Sun, Pengjun, Ding, Siye, Zhang, Xiaodong, Liu, Fukun, Zhao, Yanping, Xiao, Bingjia, Hu, Jiansheng, Hu, Chundong, Hu, Liqun, Li, Jiangang, and Wan, Baonian. Integrated operation of steady-state long pulse H-mode in EAST. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab1c7b.
Gong, Xianzu, Garofalo, Andrea M., Huang, Juan, Qian, Jinping, Holcomb, Chris T., Ekedahl, Annika, Maingi, Rajesh, Li, Erzhong, Zeng, Long, Zhang, Bin, Chen, Jiale, Wu, Muquan, Du, Hongfei, Li, Miaohui, Zhu, Xiang, Sun, Youwen, Xu, Guosheng, Zang, Qing, Wang, Liang, Zhang, Ling, Liu, Haiqing, Lyu, Bo, Sun, Pengjun, Ding, Siye, Zhang, Xiaodong, Liu, Fukun, Zhao, Yanping, Xiao, Bingjia, Hu, Jiansheng, Hu, Chundong, Hu, Liqun, Li, Jiangang, & Wan, Baonian. Integrated operation of steady-state long pulse H-mode in EAST. United States. doi:10.1088/1741-4326/ab1c7b.
Gong, Xianzu, Garofalo, Andrea M., Huang, Juan, Qian, Jinping, Holcomb, Chris T., Ekedahl, Annika, Maingi, Rajesh, Li, Erzhong, Zeng, Long, Zhang, Bin, Chen, Jiale, Wu, Muquan, Du, Hongfei, Li, Miaohui, Zhu, Xiang, Sun, Youwen, Xu, Guosheng, Zang, Qing, Wang, Liang, Zhang, Ling, Liu, Haiqing, Lyu, Bo, Sun, Pengjun, Ding, Siye, Zhang, Xiaodong, Liu, Fukun, Zhao, Yanping, Xiao, Bingjia, Hu, Jiansheng, Hu, Chundong, Hu, Liqun, Li, Jiangang, and Wan, Baonian. Thu . "Integrated operation of steady-state long pulse H-mode in EAST". United States. doi:10.1088/1741-4326/ab1c7b. https://www.osti.gov/servlets/purl/1511460.
@article{osti_1511460,
title = {Integrated operation of steady-state long pulse H-mode in EAST},
author = {Gong, Xianzu and Garofalo, Andrea M. and Huang, Juan and Qian, Jinping and Holcomb, Chris T. and Ekedahl, Annika and Maingi, Rajesh and Li, Erzhong and Zeng, Long and Zhang, Bin and Chen, Jiale and Wu, Muquan and Du, Hongfei and Li, Miaohui and Zhu, Xiang and Sun, Youwen and Xu, Guosheng and Zang, Qing and Wang, Liang and Zhang, Ling and Liu, Haiqing and Lyu, Bo and Sun, Pengjun and Ding, Siye and Zhang, Xiaodong and Liu, Fukun and Zhao, Yanping and Xiao, Bingjia and Hu, Jiansheng and Hu, Chundong and Hu, Liqun and Li, Jiangang and Wan, Baonian},
abstractNote = {Recent EAST experiment has successfully exhibited long-pulse steady-state scenario with improved plasma performance through the integrated operation since the last IAEA FEC in 2016. A discharge with a duration over 100s using pure RF power H&CD has been obtained with the required characteristics for future long pulse tokamak reactors such as good energy confinement quality (H98y2 ~ 1.1) with eITB inside $\square$$\square$< 0.4, small ELMs (frequency ~100-200 Hz), 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 LHW antenna were integrated with global parameters of BT and line averaged electron density <ne> for higher current drive efficiency of LHW and on-axis deposition of ECH in the long pulse operation. More recently, a high βP RF-only discharge (βP~1.9 & βN~1.5, <ne>/nGW~0.80, fbs~45% at q95~6.8) was successfully maintained over 24s with improved hardware capabilities, demonstrating performance levels needed for CFETR steady-state operation. A higher energy confinement is observed at higher βP and with favourable toroidal field direction. Towards the next goal (≥ 400s long-pulse H-mode operations with ~50% bootstrap current fraction) on EAST, an integrated control of current density profile, pressure profile and the radiated divertor will be presented in the near future.},
doi = {10.1088/1741-4326/ab1c7b},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 8,
volume = 59,
place = {United States},
year = {2019},
month = {4}
}

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Works referenced in this record:

Progress of the CFETR design
journal, June 2019


Suppression of tungsten accumulation during ELMy H-mode by lower hybrid wave heating in the EAST tokamak
journal, August 2017


SOL effects on the pedestal structure in DIII-D discharges
journal, May 2017


Confinement improvement in the high poloidal beta regime on DIII-D and application to steady-state H-mode on EAST
journal, May 2017

  • Ding, S.; Garofalo, A. M.; Qian, J.
  • Physics of Plasmas, Vol. 24, Issue 5
  • DOI: 10.1063/1.4982058

Realization of minute-long steady-state H-mode discharges on EAST
journal, February 2017


Transport of fast electrons during LHCD in TS, JET, and ASDEX
journal, December 1993


A digital long pulse integrator for EAST Tokamak
journal, May 2014


Joint DIII-D/EAST research on the development of a high poloidal beta scenario for the steady state missions of ITER and CFETR
journal, November 2017

  • Garofalo, A. M.; Gong, X. Z.; Ding, S. Y.
  • Plasma Physics and Controlled Fusion, Vol. 60, Issue 1
  • DOI: 10.1088/1361-6587/aa8c9d

Separation of β̄ p and ℓ i in tokamaks of non-circular cross-section
journal, October 1985


Development of high poloidal beta, steady-state scenario with ITER-like tungsten divertor on EAST
journal, June 2017


Comparison between gas puffing and supersonic molecular beam injection in plasma density feedback experiments in EAST
journal, October 2013


Present Status of the EAST Diagnostics
journal, February 2011