Standard quasilinear descriptions are based on the constant magnetic field form of the quasilinear operator so improperly treat the trapped electron modifications associated with tokamak geometry. Moreover, successive poloidal transits of the Landau resonance during lower hybrid current drive in a tokamak are well correlated, and these geometrical details must be properly retained to account for the presence of trapped electrons that do not contribute to the driven current. The recently derived quasilinear operator in tokamak geometry accounts for these features and finds that the quasilinear diffusivity is proportional to a delta function with a transit or bounce averaged argument (rather than a local Landau resonance condition). The new quasilinear operator is combined with the Cordey (Nucl. Fusion, vol. 16, 1976, pp. 499–507) eigenfunctions to properly derive a rather simple and compact analytic expression for the trapped electron modifications to the driven lower hybrid current and the efficiency of the current drive.

中文翻译：

---

托卡马克中较低的混合电流驱动，用于相关通过共振

标准拟线性描述基于拟线性算子的恒定磁场形式，因此不正确地处理与托卡马克几何相关的俘获电子修改。此外，在托卡马克中较低的混合电流驱动期间，朗道共振的连续极向跃迁具有很好的相关性，并且必须适当地保留这些几何细节，以解释对驱动电流没有贡献的俘获电子的存在。最近推导出的托卡马克几何中的准线性算子解释了这些特征，并发现准线性扩散率与具有传输或反弹平均参数的 delta 函数成比例（而不是局部朗道共振条件）。新的拟线性算子与 Cordey (核。融合, 卷。16, 1976, pp. 499–507) 特征函数正确推导出一个相当简单和紧凑的解析表达式，用于对驱动的低混合电流和电流驱动效率的俘获电子修改。