Campanell M D, Johnson G R
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
Phys Rev Lett. 2019 Jan 11;122(1):015003. doi: 10.1103/PhysRevLett.122.015003.
Contemporary models of bounded plasmas assume that the target plasma electron temperature far exceeds the temperature of the cold electrons emitted from the target, T_{emit}. We show that when the sheath facing a collisional plasma becomes inverted, the target plasma electron temperature has to equal T_{emit} even if the upstream plasma is hotter by orders of magnitude. This extreme cooling effect can alter the plasma properties and the heat transmission to thermionically emitting surfaces in many applications. It also opens a possibility of using thermionic divertor plates to induce detachment in tokamaks.
当代有限等离子体模型假设，靶等离子体电子温度远高于从靶发射出的冷电子的温度(T_{emit})。我们表明，当面对碰撞等离子体的鞘层发生反转时，即使上游等离子体温度高出几个数量级，靶等离子体电子温度也必须等于(T_{emit})。这种极端的冷却效应可以改变等离子体特性以及在许多应用中向热离子发射表面的热传递。它还开启了利用热离子偏滤器板在托卡马克中诱导脱靶的可能性。
