Transport analysis of JT-60 plasma with the drift wave turbulence model

Abstract

Characteristics of the JT-60 plasma in both the Ohmic heating phase and the neutral beam heating phase have been studied numerically by using a one-dimensional tokamak transport code, with the thermal conductivities based on the drift wave turbulence (DWT) model. The numerical results for the central electron temperature Te(0) and the energy confinement time τE show good agreement with the experimental data in the medium line averaged electron density range n̄e ∼ 4 × 1019 m−3, for both Ohmic heating and neutral beam'heating cases. The absorbed power degradation of is also reproduced with this model. On the other hand, the DWT model underestimates the plasma temperatures at low line averaged electron density, especially in the neutral beam heating phase, because of the strong dependence of the thermal conductivity on the electron temperature, and high temperature plasmas cannot be reproduced. This leads to a discrepancy in the n̄e dependence of τE between experiment and calculation. The current dependence of τE is not reproduced either, even when the Venetian blind model is used.