Open AccessEffects of core stochastization on particle and momentum transport
Author(s) -
Y. Ohtani,
K. Tanaka,
H. Igami,
K. Ida,
Y. Suzuki,
Y. Takemura,
Hayato Takahashi,
M. Sanders,
M. Yoshinuma,
T. Tokuzawa,
I. Yamada,
Ryo Yasuhara,
H. Funaba,
M. Shoji,
T. Bando
Publication year - 2021
Publication title -
nuclear fusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.774
H-Index - 120
eISSN - 1741-4326
pISSN - 0029-5515
DOI - 10.1088/1741-4326/abd6b1
Subject(s) - plasma , physics , cyclotron , toroid , magnetic field , core (optical fiber) , electron , atomic physics , diffusion , momentum (technical analysis) , tokamak , particle (ecology) , angular momentum , computational physics , classical mechanics , nuclear physics , quantum mechanics , optics , economics , geology , oceanography , finance
The effects of the stochastic magnetic field in a plasma center produced by electron cyclotron current drive (ECCD) on transport have been revealed. Because the electron temperature profile is flat in the core region, in the case of counter-directed ECCD (ctr-ECCD) against the toroidal magnetic field, the magnetic field is stochastic in the core region with rotational transform ᵼ ∼ 1/3. The particle diffusion coefficient of the ctr-ECCD plasma is approximately 20 times as large as that of the plasma without the stochastic magnetic field produced by co-directed ECCD (co-ECCD) at the maximum. Furthermore, in the stochastic magnetic field with ctr-ECCD, counter-directed intrinsic rotation is observed in the plasma with balanced NBI discharge.