プラズマノトジコメトカネツニタイスルニタイショウトツノヤクワリ

京都大学0048新制・課程博士工学博士甲第2100号工博第573号新制||工||413(附属図書館)5728UT51-53-M80京都大学大学院工学研究科原子核工学専攻(主査)教授 秋宗 秀夫, 教授 宇尾 光治, 教授 飯吉 厚夫学位規則第5条第1項該当Kyoto UniversityDA

Nonlocal Thermal Transport to Edge Perturbation in Tokamak Plasma

Simulation study on nonlocal plasma response in tokamak is performed using global code based on the 5-field reduced MHD model. A nonlocal plasma response to edge perturbation is found. The simulation result shows that (i) the mean central electron temperature increases according to the edge cooling (it is shown for the first time), (ii) the magnetic island located at q = 2 rational surface plays an important role (acting as internal transport barrier) as well as non-resonant modes such as (0, 0) and (1, 0) (here (m, n) implies Fourier mode with poloidal mode number m and toroidal mode number n), (iii) re-distribution of electron temperature occurs after turning off source and sink where meso-scale mode plays a major role.26th IAEA Fusion Energy Conferenc

Nonlocal plasma response to edge perturbation in tokamak

Nonlocal response of electron temperature fluctuation is investigated using 5-field Reduced MHD model. Source and sink terms are introduced into density and electron temperature evolution equations, respectively. It is found that (i) the mean central electron temperature increases according to the edge cooling, (ii) the magnetic island located at q=2 rational surface plays an important role as well as non-resonant modes such as 0/0 and 1/0, (iii) re-distribution of electron temperature occurs after switching off source and sink where meso-scale mode plays a major role.11th Japan-Korea Workshop on ‘‘Modeling and Simulation of Magnetic Fusion Plasmas

Particle transport with inverted density gradient in peripheral region of tokamak

Understanding of particle pinch mechanism in the peripheral region is an important issue to supply D-T fuels for future tokamak reactors. Using a delta-f electromagnetic gyrokinetic simulation code dFEFI, we investigated a local dynamics of particle transport in the case of inverted density gradient. It was shown that in the nonlinear phase, the lower wave number mode becomes dominant, which produces an inward particle flux.In the present work, to understand these simulation results, we revisit the ion-mixing mode model. We find that there exist two unstable modes, namely, the ion-mixing mode and the electron drift wave. The ion-mixing mode is driven by negative compression (slab ITG mode) and nonadiabatic electron response through parallel electron heat conductivity. The toroidal effect is subdominant. In the case of inverted density gradient, the electron drift wave is more destabilized by the nonadiabatic electron response through the parallel electron heat conductivity.17th International Workshop on Plasma Edge Theory in Fusion Device