Numerical Study of LHRF-Heating in a Tokamak

概要

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By use of a one-dimensional tokamak transport simulation code, numerical estimations are performed of the experimental results of lower hybrid range of frequency heating (LHRF) in JFT-2 tokamak. The coupling of launched electromagnetic wave to a plasma, propagation and absorption of the wave are considered within the framework of linear theory and the resultant energy deposition is incorporated into the transport code. The result of simulation gives the maximum heating efficiency of the value of 2∿3 eV/kW, when the turning point of lower hybrid wave is located near the center of the plasma column, whereas the experiment obtains 1∿1.5 eV/kW. Dependences of the heating efficiency on the phase difference between adjacent waveguides and on the density are calculated. It is found that the density dependence is contrary to that of the experiment. The importance of two-dimensional propagation and the nonlinear absorption of waves are indicated.
核融合科学研究所の論文