标题： 由托卡马克等离子体中几乎有理面驱动的本征动量输运 显示英文标题

标题： Intrinsic momentum transport driven by almost-rational surfaces in tokamak plasmas

摘要： 我们证明，当安全因子 q 接近（但不完全等于）有理数且磁剪切为$\hat{s} \approx 0$时，局部环流动力学模型的对称性会被破坏。 具有这种 q 轮廓的托卡马克装置会由于湍流动量输运而自发旋转。 非线性环流动力学模拟表明，这一机制比所有其他内在旋转驱动机制都要强得多。 它还会产生内在电流，使 q 趋向于有理值，可能有助于非感应电流驱动。 这在内部输运屏障的触发中可能是重要的。 显示英文摘要

摘要： We demonstrate that a symmetry of the local gyrokinetic model is broken when the safety factor q is almost (but not exactly) a rational number and magnetic shear is $\hat{s} \approx 0$. Tokamaks with such a q profile will spontaneously rotate due to turbulent momentum transport. Nonlinear gyrokinetic simulations indicate this mechanism is significantly stronger than all other drives of intrinsic rotation. It also generates intrinsic electric current that pulls q towards rational values, potentially aiding non-inductive current drive. This is likely important in the triggering of internal transport barriers.