Journal article · Preprint article
Dynamics of cold pulses induced by super-sonic molecular beam injection in the EAST tokamak
Chinese Academy of Sciences1
Seoul National University2
University of Science and Technology of China3
Commissariat à l’énergie atomique et aux énergies alternatives4
Department of Physics, Technical University of Denmark5
Plasma Physics and Fusion Energy, Department of Physics, Technical University of Denmark6
Evolution of electron temperature, electron density and its fluctuation with high spatial and temporal resolutions are presented for the cold pulse propagation induced by super-sonic molecular beam injection (SMBI) in ohmic plasmas in the EAST tokamak. 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 1019 m-3.
In contrary to the response of core electron temperature and electron density (roughly 10ms 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 30ms).
It was also observed that the turbulence perpendicular velocity close to the inversion point of the temperature perturbation changes sign after SMBI.
Language: | English |
---|---|
Year: | 2019 |
Pages: | 044005 |
ISSN: | 17414326 , 10185577 and 00295515 |
Types: | Journal article and Preprint article |
DOI: | 10.1088/1741-4326/ab0665 |
ORCIDs: | Naulin, Volker , 0000-0002-9801-9193 , 0000-0002-9572-3310 and 0000-0002-3164-7320 |
High spatial and temporal resolutions Non-local transport Turbulence measurement Turbulence spreading