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Matsuoka, Seikichi; Idomura, Yasuhiro
no journal, ,
Recently, full-f gyrokinetic simulations, in which the total plasma distribution is evolved based on the first principle, attracted much attention in the plasma transport study. Rich physics has been revealed by the simulations in axisymmetric tokamak plasmas such as JT-60 and ITER. However, no full-f gyrokinetic simulations in non-axisymmetric, or three-dimensional magnetic field equilibria such as stellarators and/or helical devices have been reported so far due to their complicated magnetic field geometries which requires more computational resources. In this work, we extend a full-f gyrokinetic simulation code, GT5D, to treat three-dimensional magnetic equilibria by modifying its coordinates, and develop a new interface between GT5D and VMEC, where VMEC is a numerical tool to construct a three-dimensional magnetic equilibria. In the presentation, we present benchmark results as a numerical verification of GT5D+VMEC by comparing the collisional (neoclassical) transport.
Idomura, Yasuhiro
no journal, ,
Reversal or change of plasma rotation is one of outstanding issues in recent momentum transport tokamak experiments. We address this issue based on numerical experiments using a Gyrokinetic Toroidal 5D full-f Eulerian code GT5D, in which detailed mechanisms of momentum transport and the resulting plasma rotation can be analysed from direct observation of the toroidal angular momentum conservation. In many tokamaks, rotation changes are commonly observed by applying electron cyclotron resonance heating without momentum input. The rotation changes induced by electron heating is reproduced for the first time by the numerical experiment, and it is found that a change of turbulent momentum transport between ion turbulence to electron turbulence plays a critical role.