A characterization of plasma fluctuations within a Hall discharge
A characterization of plasma fluctuations within a Hall discharge
复制标题
DOI：
10.1109/27.940951
复制
发表时间：
2001-08
影响因子：
1.5
通讯作者：
E. Chesta;C. Lam;N. Meezan;D. Schmidt;M. Cappelli
中科院分区：
文献类型：
--
作者：
E. Chesta;C. Lam;N. Meezan;D. Schmidt;M. Cappelli
给出了研究交叉场封闭电子漂移霍尔放电中低频（2-20 kHz）和中频（20-100 kHz）振荡的实验结果。使用两个静电探针的条件采样用于识别和提取与放电通道内的方位角和纵向不稳定性的传播相关联的相干结构的属性。方位角分量相速度被确定为一个宽范围的波频率和这些设备的操作的特性制度。各种传播模式进行了观察和分析，包括由于探针本身的存在引起的模式的外观。这后来的结果被认为是第一个直接的证据，波动可以在这些霍尔放电使用相对简单的驱动方法的影响。
Experimental results are presented for studies of low (2-20 kHz) and intermediate-frequency (20-100 kHz) oscillations in crossed-field closed electron-drift Hall discharges. Conditional sampling using two electrostatic probes is used to identify and extract properties of coherent structures associated with the propagation of azimuthal and longitudinal instabilities within the discharge channel. The azimuthal component phase velocities are determined for a wide range of wave frequencies and over characteristic regimes of operation of these devices. A variety of propagation modes are observed and analyzed, including the appearance of an induced mode due to the presence of the probes themselves. This later result is believed to be the first direct evidence of how fluctuations can be influenced in these Hall discharges using relatively simple actuation methods.