Speaker
Description
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1087.pdf
One of the most provocative phenomenons in plasma transport is the so called non-local heat transport: the core temperature increases in response to edge cooling. This was observed for the first time in the TEXT experiment in 1995, and was reproduced in many tokamaks (TFTR, Tore Supra, RTP, ASDEX-U, JET, HL-2A, Alcator C-Mod, KSTAR, J-TEXT) and helical devices (LHD).
In EAST non-local heat transport has been observed recently during plasma edge cooling induced by super-sonic molecular beam injection (SMBI) [1]. The non-local heat transport occurs for discharges with plasma current Ip = 450 kA (q95~5.55), and electron density ne0 below a critical value of (1.35 ± 0.25) x 10^19 m^-3. In contrary to the response of core electron temperature and electron density (roughly 10 ms after SMBI), the electron density fluctuation in the plasma core increases promptly after SMBI and reaches its maximum around 15 ms after SMBI. The electron density fluctuation in the plasma core begins to decrease before the core electron temperature reaches its maximum (roughly 30 ms). It was also observed that the turbulence perpendicular
velocity close to the inversion point of the temperature perturbation changes sign after SMBI.
[1] Y. Liu et al., Nucl. Fusion (2019) accepted
This work was supported by the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology, and the National Natural Science Foundation of China under Grant Nos. 11405211, 11575248. This work was also partly supported by National Magnetic Confinement Fusion Science Program of China under Contract Nos. 2015GB101003 and 2015GB103002, Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Science and ICT of Republic of Korea (No. 2018R1A2B2008692).
