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Benchmark of a new multi-ion-species collision operator for δf Monte Carlo neoclassical simulation
Computer Physics Communications ( IF 3.309 ) Pub Date : 2020-03-02 , DOI: 10.1016/j.cpc.2020.107249
Shinsuke Satake; Motoki Nataka; Theerasarn Pianpanit; Hideo Sugama; Masanori Nunami; Seikichi Matsuoka; Seiji Ishiguro; Ryutaro Kanno

A numerical method to implement a linearized Coulomb collision operator in the two-weight δf Monte Carlo method for multi-ion-species neoclassical transport simulation is developed. The conservation properties and the self-adjoint property of the operator in the collisions between two particle species with different temperatures are verified. The linearized operator in a δf Monte Carlo code is benchmarked with other two kinetic simulations, a δf continuum gyrokinetic code with the same linearized collision operator and a full-f PIC code with Nanbu collision operator. The benchmark simulations of the equilibration process of plasma flow and temperature fluctuation among several particle species show very good agreement between δf Monte Carlo code and the other two codes. An error in the H-theorem in the two-weight δf Monte Carlo method is found, which is caused by the weight spreading phenomenon inherent in the two-weight δf method. It is demonstrated that the weight averaging method serves to restoring the H-theorem without causing side effect.
更新日期:2020-03-02

 

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