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3.2. Integrated heat transport simulation of C-pellet injection plasma
We study the high Ti plasma with C pellet injection of LHD applying the integrated simulation code GNET-TD + TASK3D. We perform time-dependent NBI heating simulation of high Ti plasma of LHD using GNET-TD [15] code, which is a modified version of the 5D drift kinetic equation solver GNET [16]. We take into account the time development of the plasma density and temperature during the slowing-down of beam ions. Experimental data of the plasma density, temperature, and NBI heating is used as the input to GNET-TD. Next we investigate the heat transport of high Ti plasma assuming multi-ion species plasma (e, H, He, C) by the integrated transport code, TASK3D [7, 8].
In order to analyze the NBI heat deposition profile of time evolving plasma, we performed NBI heating simulation of high-Ti discharge (# 110599) plasma, in which the plasma density changes in time due to the C pellet injection. There are five NBI injectors and one of them #4 is modulated in order to measure the ion temperature. The heating power of each NBI injector is about 5 MW and the total heating power becomes about 25 MW in this experiment. In the simulation time change of densities and temperature profiles are from the experimental measurements. The plasma density rapidly increases due to the pellet injection and decays gradually. The Zeff also increases due to the increase of the carbon impurity by the pellet injection.
GNET-TD solves a 5D drift kinetic equation including the finite drift orbit and complex motion of trapped particles. We can evaluate the time dependent beam distributions including the density and temperature time evolutions, and beam modulations. In this simulation we have assume the pure hydrogen plasma as a first step in order to evaluate the plasma heat depositions. Also, for simplicity we assumed Te = Ti because Vbeam >> Vi. We evaluate the beam distributions including time evolution of density and temperature and beam modulations.