AI 中文总结
该研究在NLT中开发并验证局部新经典输运模块，包含多物种碰撞算子及两种求解策略，经与NEO基准测试，结果相符。此模块应用于EAST相关的钨杂质输运和捕获电子模稳定性研究，揭示了相关特性，扩展了NLT在多物种碰撞输运模拟方面的能力。
AI 中文摘要
在半拉格朗日回旋动理学代码NLT中开发并验证了一个用于多物种碰撞等离子体的局部新经典输运模块。该模块包含线性化的多物种Sugama碰撞算子，并提供两种互补的求解策略。在初值公式中，引入了复合子步源积分方案来准确评估沿未受扰动粒子轨迹的新经典驱动力，同时保持较大的宏观时间步长。还实现了直接稳态求解器以获得稳态新经典响应而无需长时间松弛。两种方法针对电子 - 离子等离子体和含碳杂质的三物种等离子体与欧拉新经典代码NEO进行了基准测试。NLT结果在广泛的碰撞率范围内再现了NEO的粒子和热通量、平行流以及自举电流。作为代表性应用，将经过验证的框架应用于与EAST相关的钨杂质输运和核心捕获电子模稳定性。结果表明，钨新经典输运对局部剖面梯度敏感，而在与EAST相关的条件下，与较大\(Z_{\rm eff}\)相关的有效碰撞率增加会降低线性TEM增长率。这些进展将NLT扩展到实际的多物种碰撞输运模拟。
英文摘要
A local neoclassical transport module has been developed and validated in the semi-Lagrangian gyrokinetic code NLT for multi-species collisional plasmas. The module incorporates a linearized multi-species Sugama collision operator and provides two complementary solution strategies. In the initial-value formulation, a composite substep source-integration scheme is introduced to accurately evaluate the neoclassical drive along unperturbed particle trajectories while retaining large macroscopic time steps. A direct steady-state solver is also implemented to obtain the stationary neoclassical response without long-time relaxation. The two approaches are benchmarked against the Eulerian neoclassical code NEO for electron-ion plasmas and three-species plasmas with carbon impurities. The NLT results reproduce the NEO particle and heat fluxes, parallel flows, and bootstrap current over a broad collisionality range. As representative applications, the validated framework is applied to EAST-relevant tungsten impurity transport and core trapped-electron-mode stability. The results show that tungsten neoclassical transport is sensitive to local profile gradients, while the increased effective collisionality associated with larger \(Z_{\rm eff}\) can reduce the linear TEM growth rate under the considered EAST-relevant conditions. These developments extend NLT toward realistic multi-species collisional transport simulations.
Comments21pages, 11 figures,Submitted to Plasma Science and Technology
