Abstract
The particle and heat transport driven by the ion temperature gradient instability in helical plasmas is investigated by the gyrokinetic analysis taking into account the kinetic electron response. High and low ion temperature plasma cases for the discharge in the Large Helical Device (LHD) are studied. Two types of transport models with a lower computational cost to reproduce the nonlinear gyrokinetic simulation results within allowable errors are presented for application in quick transport analyses. The turbulent electron and ion heat diffusivity models are given in terms of the linear growth rate and the characteristic quantity for the linear response of zonal flows, while the model of the effective particle diffusivity is not obtained for the flattened density profile observed in the LHD. The quasilinear flux model is also shown for the heat transport. The quasilinear flux models for the energy fluxes are found to reproduce the nonlinear simulation results at the accuracy similar to that of the heat diffusivity models. In addition, the quasilinear particle flux model, which is applicable to the transport analysis for LHD plasmas, is constructed. These turbulent reduced models enable coupling to the other simulation in the integrated codes for the LHD.
Highlights
A quantitative prediction of turbulent transport1,2 is one of the most critical issues for realizing magnetic fusion energy
Obtained from the nonlinear simulations are compared with the model functions i
The simulation results for the ion heat diffusivity are well fitted by the model function14
Summary
The particle and heat transport driven by the ion temperature gradient instability in helical plasmas are investigated by the gyrokinetic analysis taking into account the kinetic electron response. The quasilinear flux model is shown for the heat transport. The quasilinear flux models for the energy fluxes are found to reproduce the nonlinear simulation results at the accuracy similar to that of the heat diffusivity models. The quasilinear particle flux model, which is applicable to the transport analysis for LHD plasmas, is constructed.
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