Speaker
Bo Shi
(Institute of Plasma Physics)
Description
H-mode is the main operation mode in the future fusion reactor and L-H transition is one of the concerning issue of H-mode research[1]. Much effort has been made on the research of L-H transition, however, the detail characters of the L-H transition need more research to afford reference for the optimization of H-mode plasma discharge [2-4]. An infrared(IR)/visible endoscope system was built on the Experimental Advanced Superconducting Tokamak (EAST) in 2014. The temperature distributions of the lower divertor during L-H transition with the lower-hybrid wave current drive (LHCD) only as well as with both the LHCD and the NBI at different time have been measured. Based on the IR data of EAST, the heat fluxes on the lower outer divertor were calculated with a code named DFLUX developed by ASIPP, aimed to provide reference for the H-mode operation of EAST. The analyzed discharges were lower single null diverted discharges. Analysis results show that the changes of heat flux before and after L-H transition are related to the types of auxiliary heating and the time of energy injection. When the auxiliary power in the case with LHCD only (~ 2MW) is one-time injection, two even three L-H transitions could occur. The peak heat fluxes increased rapidly with the energy injection and shut down at the time of L-H transition. When the auxiliary power in the case with LHCD(1.2MW) and NBI (~ 1MW)are injected successively, the plasma density after L-H transition were often step growth and the changes of peak heat fluxes of L-H transition were relatively small.
Co-authors
Bo Shi
(Institute of Plasma Physics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei, China;Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, China;Institute of Applied Physics, AOA, Hefei, China)
Gan Kaifu
(Institute of Plasma Physics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei, China)
Gong Xianzu
(Institute of Plasma Physics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei, China)
Qi Junli
(Institute of Applied Physics, AOA, Hefei, China)
Wang Ping
(Institute of Applied Physics, AOA, Hefei, China)
Wang Rongfei
(Institute of Applied Physics, AOA, Hefei, China)
Wang Weihua
(Institute of Plasma Physics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei, China;Institute of Applied Physics, AOA, Hefei, China)
Yang Jinhong
(Institute of Applied Physics, AOA, Hefei, China)
Yang Zhendong
(Institute of Plasma Physics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei, China)
Zhang Bin
(Institute of Plasma Physics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei, China)
