Benchmark study on the neoclassical transport of a global full-f gyrokinetic simulation in three dimensional equilibria

Matsuoka, Seikichi ; Idomura, Yasuhiro   ; Satake, Shinsuke*

Global full-f gyrokinetic simulations, in which the gyrokinetic equation is solved based on the first principle without the scale separation with respect to the plasma distribution function, is attracting much attention in the plasma transport study. However, global full-f gyrokinetic simulation studies in three-dimensional plasmas have been reported so far, since the existing global full-f gyrokinetic simulation codes are developed with the aim to explore the transport physics in axisymmetric tokamak plasmas. In this work, we extend a global full-f gyrokinetic simulation code, GT5D, to treat three-dimensional magnetic equilibria by constructing a new coordinate system. A new interface code between GT5D and a 3D equilibrium code, VMEC, are developed, in which outputs provided by VMEC code is incorporated into GT5D. The extended version of GT5D is verified against the collisional (neoclassical) transport by comparing the transport to another neoclassical code and an analytical theory.