Probing of flowing electron plasmas
Probing of flowing electron plasmas
复制标题
流动电子等离子体的探测
DOI：
10.1063/1.1395568
复制
发表时间：
2001
影响因子：
2.2
通讯作者：
Z. Yoshida
中科院分区：
文献类型：
--
作者：
H. Himura;C. Nakashima;H. Saito;Z. Yoshida
研究了有限温度流动电子等离子体的探测问题。首次在电子等离子体中测量了电探针的电流-电压特性。由于电子等离子体的快速流动，特征曲线显著地展开并且呈现出长尾。该特征可以通过计算收集到探头的电流来解释。在流动的电子等离子体中，即使等离子体达到热平衡状态，在实验室坐标系中观察到的分布函数也是非麦克斯韦的。该特性的另一个重要特征是，它确定了电流等于零的浮动电位，尽管电子等离子体中的离子非常少。电子等离子体的空间电位是由高阻抗探针输出的，它被广泛地用于测量电子等离子体的空间电位。该方法仅适用于密度远小于布里渊极限的等离子体。
Probing of streaming electron plasmas with finite temperature is studied. For the first time, a current-voltage characteristic of an electric probe is measured in electron plasmas. Due to the fast flow of the electron plasmas, the characteristic curve spreads out significantly and exhibits a long tail. This feature can be explained calculating the currents collected to the probe. In flowing electron plasmas, the distribution function observed in the laboratory frame is non-Maxwellian even if the plasmas come to a state of thermal equilibrium. Another significant feature of the characteristic is that it determines a floating potential where the current equals zero, despite there being very few ions in the electron plasma. A high impedance probe, which is popularly used to determine the space potential of electron plasmas, outputs the potential. The method is available only for plasmas with density much smaller than the Brillouin limit.