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首页> 外文期刊>Plasma physics and controlled fusion >Solution of drift kinetic equation in stellarators and tokamaks with broken symmetry using the code NEO-2
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Solution of drift kinetic equation in stellarators and tokamaks with broken symmetry using the code NEO-2

机译：使用代码NEO-2求解对称性不佳的恒星和托卡马克中的漂移动力学方程

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摘要

NEO-2 is a linearized drift kinetic equation solver for three-dimensional toroidal magnetic fields. It has been designed in order to treat effectively-besides all other regimes-the long mean free path regime, avoiding any simplifications on device geometry or on the Coulomb collision model. The code is based on the field line integration technique combined with a multiple domain decomposition approach, which allows for introduction of an adaptive grid in velocity space. This makes NEO-2 capable of effectively resolving all boundary layers between various classes of trapped particles and passing particles, and also allows for straightforward code parallelization. In stellarators, NEO-2 is used mainly for computations of neoclassical transport coefficients in regimes with slow plasma rotation and for the evaluation of the generalized Spitzer function, which plays the role of a current drive efficiency. In tokamaks with small ideal non-axisymmetric magnetic field perturbations, NEO-2 is used for evaluation of the toroidal torque resulting from these perturbations (neoclassical toroidal viscosity). The limitation to slow plasma rotation pertinent to usage in stellarators has been removed in this case with the help of a quasilinear approach, which is valid due to the smallness of the perturbation field.
机译：NEO-2是用于三维环形磁场的线性化漂移动力学方程求解器。它的设计目的是要有效地治疗所有其他状态（长平均自由程状态），避免对设备几何形状或库仑碰撞模型进行任何简化。该代码基于场线集成技术和多域分解方法，该方法允许在速度空间中引入自适应网格。这使得NEO-2能够有效解析各种类型的捕获粒子和通过粒子之间的所有边界层，并且还允许直接进行代码并行化。在恒星中，NEO-2主要用于在等离子旋转慢的情况下计算新古典运输系数，并评估广义Spitzer函数，该函数起着当前驱动效率的作用。在具有较小的理想非轴对称磁场扰动的托卡马克中，NEO-2用于评估由这些扰动引起的环形转矩（新古典环形粘度）。在这种情况下，借助准线性方法消除了与在恒星仪中使用相关的慢速等离子体旋转的限制，由于微扰场很小，这种限制是有效的。

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