论文标题
等离子体热淬火的冷却流动状态
Cooling flow regime of a plasma thermal quench
论文作者
论文摘要
大型的实验室，空间和天体物理等离子体几乎无碰撞。当将局部能量或粒子下水道以辐射冷却点或黑洞的形式引入这样的等离子体时，它会触发血浆热塌陷（也称为Tokamak融合中的热淬灭）。在这里，我们表明，由于双极传输的限制，由于这种几乎无碰撞的血浆中的电子热传导以对流能量传输的缩放或空间梯度缩放。结果，强大的冷却流量聚集了质量朝向冷却点，周围等离子体的热塌陷采取了沿磁场线的四个源自辐射冷却点的传播前部的形式。负责深冷却的最慢的是一个震惊的阵线。
A large class of Laboratory, Space, and Astrophysical plasmas is nearly collisionless. When a localized energy or particle sink, for example, in the form of a radiative cooling spot or a black hole, is introduced into such a plasma, it can trigger a plasma thermal collapse, also known as a thermal quench in tokamak fusion. Here we show that the electron thermal conduction in such a nearly collisionless plasma follows the convective energy transport scaling in itself or in its spatial gradient, due to the constraint of ambipolar transport. As the result, a robust cooling flow aggregates mass toward the cooling spot and the thermal collapse of the surrounding plasma takes the form of four propagating fronts that originate from the radiative cooling spot, along the magnetic field line in a magnetized plasma. The slowest one, which is responsible for deep cooling, is a shock front.
