Abstract A multi-species linearized collision operator based on the model developed by Sugama et al. has been implemented in the nonlinear gyrokinetic code, GENE. Such a model conserves particles, momentum, and energy to machine precision, and is shown to have negative definite free energy dissipation characteristics, satisfying Boltzmann’s H-theorem, including for realistic mass ratio. Finite Larmor Radius (FLR) effects have also been implemented into the local version of the code. For the global version of the code, the collision operator has been developed to allow for block-structured velocity space grids, allowing for computationally tractable collisional global simulations. The validity of the collision operator has been demonstrated by relaxation and conservation tests, as well as appropriate benchmarks. The newly implemented operator shall be used in future simulations to study magnetically confined fusion plasma turbulence and transport in more extreme regions with higher collisionality.

中文翻译：

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delta-f 陀螺动力学模拟的多物种碰撞：使用 GENE 实施和验证

摘要 基于 Sugama 等人开发的模型的多物种线性化碰撞算子。已经在非线性陀螺运动代码 GENE 中实现。这种模型将粒子、动量和能量守恒到机器精度，并显示出具有负定自由能耗散特性，满足玻尔兹曼的 H 定理，包括实际质量比。有限拉莫尔半径 (FLR) 效果也已在本地版本的代码中实现。对于代码的全局版本，碰撞算子已被开发为允许块结构速度空间网格，允许计算上易于处理的碰撞全局模拟。碰撞算子的有效性已通过松弛和守恒测试以及适当的基准测试得到证明。