PLASMA CONFINEMENT IN ECH BUMPY TORUS

概要

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Theoretical and experimental researches are reviewed on plasma confinement in ECH bumpy torus. Numerical study on particle confinement found that the particle confinement by vacuum magnetic field is the combination of toroidal and mirrorlike trap depending strongly on spatial position. The ambipolar potential improves confinement greatly and the critical energy of confined particles W is up to ε^<-1>_t (eφ) (here ε_t and φ are the inverse aspect ratio and plasma potential well or hill), while W∿eφ in tandem mirror configuration. Some useful suggestions are given to conventional neoclassical transport theory. Experimental results are also surveyed, especially focused on the scaling laws of the toroidal core plasma and hot electron ring parameters. The formation of hot electron rings is possible under some special conditions where ECH heating overcome the Coulomb drag cooling by background plasmas. In other words this condition determines the maximum density of toroidal core plasma. Attainable beta value or stored energy of hot electron rings is summarized by using experimental data of various machines. Brief report is presented on recent experiments of ICH in NBT device. ICH not only contributes to ion heating, but affects the plasma potential which has an important effect on transport. Some results are also reported with respect to theoretical analysis of stability and equilibrium.
核融合科学研究所の論文