Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Active control of amplitude and phase of high-power RF systems in EAST ICRF heating experiments

  • Guanghui Zhu (College of Physics and Optoelectronic Engineering, Shenzhen University) ;
  • Lunan Liu (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Yuzhou Mao (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Xinjun Zhang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Yaoyao Guo (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Lin Ai (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Runhao Jiang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Chengming Qin (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Wei Zhang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Hua Yang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Shuai Yuan (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Lei Wang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Songqing Ju (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Yongsheng Wang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Xuan Sun (School of Nuclear Science and Technology, University of Science and Technology of China) ;
  • Zhida Yang (School of Nuclear Science and Technology, University of Science and Technology of China) ;
  • Jinxin Wang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Yan Cheng (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Hang Li (College of Physics and Optoelectronic Engineering, Shenzhen University) ;
  • Jingting Luo (College of Physics and Optoelectronic Engineering, Shenzhen University)
  • Received : 2022.06.28
  • Accepted : 2022.10.20
  • Published : 2023.02.25
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Abstract

The EAST ICRF system operating space has been extended in power and phase control with a low-level RF system for the new double-strap antenna. Then the multi-step power and periodic phase scanning experiment were conducted in L-mode plasma, respectively. In the power scanning experiment, the stored energy, radiation power, plasma impedance and the antenna's temperature all have positive responses during the short ramp-ups of PL;ICRF. The core ion temperature increased from 1 keV to 1.5 keV and the core heating area expanded from |Z| ≤ 5 cm to |Z| ≤ 10 cm during the injection of ICRF waves. In the phasing scanning experiment, in addition to the same conclusions as the previous relatively phasing scanning experiment, the superposition effect of the fluctuation of stored energy, radiation power and neutron yield caused by phasing change with dual antenna, resulting in the amplitude and phase shift, was also observed. The active control of RF output facilitates the precise control of plasma profiles and greatly benefits future experimental exploration.

Keywords

Acknowledgement

The authors would like to thank the technical staff of the EAST group at the Institute of Plasma Physics and College of Physics and Optoelectronic Engineering for their helpful support during this work. This work was supported by the Development Program of China under Grant Nos. 2019YFE03070000, and 2022YFE03190200, and the National Natural Science Foundation of China under Grant Nos. 12105184, 11975265, 12175273, and 11675213, the National Key Research under Grant Nos. 2019YFE03070003, and the Comprehensive Research Facility for Fusion Technology Program of China under Contract No. 2018-000052-73-01001228.

References

  1. H. Kasahara, T. Seki, An analysis of an ICRF antenna with controllable toroidal wavenumber in LHD, Plasma Fusion Res. 5 (2010). S2090-S2090. https://doi.org/10.1585/pfr.5.S2090
  2. V. Maquet, A. Messiaen, Optimized phasing conditions to avoid edge mode excitation by ICRH antennas, J. Plasma Phys. 86 (2020), 855860601.
  3. E. Lerche, D. Van Eester, ICRH options for JET-ILW DTE2 operation, AIP Conf. Proc. 2254 (2020), 030007.
  4. R.I. Pinsker, Development of impedance matching technologies for ICRF antenna arrays, Plasma Phys. Contr. Fusion 40 (1998) A215-A229. https://doi.org/10.1088/0741-3335/40/8A/015
  5. R.A. Murray, A. Kanojia, Upgrade of the ICRF fault and control systems on alcator C-mod, in: 2009 23RD IEEE/NPSS SYMPOSIUM ON FUSION ENGI-NEERING, 2009, pp. 489-492.
  6. V. Bobkov, R. Bilato, Improved operating space of the ICRF system in ASDEX upgrade, AIP Conf. Proc. 2254 (2020), 040005.
  7. K. Saito, R. Kumazawa, Current phase control test based on real-time measurement of impedance matrix of ICRF antennas, Fusion Eng. Des. 86 (2011) 987-991. https://doi.org/10.1016/j.fusengdes.2011.02.033
  8. R.P. Yadav, S. Kumar, Design of the 1.5 MW, 30-96 MHz ultra-wideband 3 dB high power hybrid coupler for Ion Cyclotron Resonance Frequency (ICRF) heating in fusion grade reactor, Rev. Sci. Instrum. 87 (2016), 014703.
  9. J.M. Noterdaeme, V.V. Bobkov, Matching to ELMy plasmas in the ICRF domain, Fusion Eng. Des. 74 (2005) 191-198. https://doi.org/10.1016/j.fusengdes.2005.06.071
  10. L.N. Liu, L. Wang, Impedance matching system using triple liquid stub tuners for high-power ion cyclotron resonance heating in EAST tokamak, Rev. Sci. Instrum. 93 (2022), 043506.
  11. H. Yang, X.J. Zhang, Overview of the ICRF antenna coupling experiments on EAST, Nucl. Fusion 61 (2021), 035001.
  12. X. Zhang, H. Yang, First experimental results with new ICRF antenna in EAST, Nucl. Fusion 62 (2022) 1-6, 086038.
  13. Z. Chen, Y.-P. Zhao, Design and implementation of power and phase feedback control system for ICRH on EAST, Nucl. Sci. Tech. 29 (2018).
  14. C.M. Qin, Y.P. Zhao, Experimental investigation of the potentials modified by radio frequency sheaths during ion cyclotron range of frequency on EAST, Plasma Phys. Contr. Fusion 55 (2012), 015004.
  15. Y.P. Zhao, X.J. Zhang, EAST ion cyclotron resonance heating system for long pulse operation, Fusion Eng. Des. 89 (2014) 2642-2646. https://doi.org/10.1016/j.fusengdes.2014.06.017
  16. Y. Mao, S. Yuan, High power RF transmitters for ICRF applications on EAST, Plasma Sci. Technol. 15 (2013) 261-265. https://doi.org/10.1088/1009-0630/15/3/14
  17. Y. Mao, S. Yuan, Development of the high radio frequency power amplifiers for ICRF heating in EAST, Fusion Sci. Technol. 61 (2012) 216-226. https://doi.org/10.13182/FST61-216-226
  18. A. Becoulet, Heating and current drive regimes in the ion cyclotron range of frequency, Plasma Phys. Contr. Fusion 38 (1996) A1-A11. https://doi.org/10.1088/0741-3335/38/12A/002
  19. G. Zhu, Q. Li, Characterisation of density linear control in a helicon plasma source with tunable antenna wavenumber spectra, Plasma Sources Sci. Technol. 30 (2021) 1-10, 075015.
  20. J. Jacquot, D. Milanesio, Radio-frequency sheaths physics: experimental characterization on Tore Supra and related self-consistent modeling, AIP Conf. Proc. 1580 (2014) 97-104.
  21. R.J. Hu, J. Chen, Upgrade of X-ray crystal spectrometer for high temperature measurement using neon-like xenon lines on EAST, Rev. Sci. Instrum. 89 (2018), 10F110.
  22. X. Pan, F. Wang, Observation of central toroidal rotation induced by ICRF on EAST, Plasma Sci. Technol. 18 (2016) 114-119. https://doi.org/10.1088/1009-0630/18/2/03
  23. G. Vogel, H. Zhang, Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST, J. Plasma Phys. 87 (2021), 905870213.