Full-f gyrokinetic simulations on rotation changes induced by electron heating modulation

Idomura, Yasuhiro   

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.