Parallel filtering in global Vlasov simulations

グローバルブラゾフシミュレーションにおける磁力線方向フィルタ

Jolliet, S.; 井戸村 泰宏   

Jolliet, S.; Idomura, Yasuhiro

In this work, a new field solver is implemented in the global Eulerian code GT5D, which drastically reduces memory. The idea is to filter high parallel components of the perturbed density and potential consistently with the gyrokinetic ordering. In addition, the gyroaverage operator has been parallelized to further reduce memory. This new solver is tested in linear and neoclassical simulations. Then, this new scheme is applied to nonlinear simulations. It is shown that the filtering procedure decreases the ion diffusivity and removes spurious components of the spectrum produced by aliasing. As a result, simulations of plasma with sizes comparable to JT60U are now possible.