In this paper, we discuss the results from the two-dimensional computational investigation of the role of thermionic cathode emission in the formation of the negative (reverse) potential near the emissive cathode (LaB₆ tablet). Two modes of discharge behavior are considered—high- and low-pressure modes. We show that the region of the negative potential (for that of the emitting cathode) is enclosed in a semi-sphere bounded by the line where the electric field changes its direction. This sheath region was distorted by the movement of the emitting points in horizontal and vertical directions. The unstable behavior of the high pressure discharge and self-excited oscillations of plasma parameters were observed. At low pressure the potential reversal and oscillations were not so pronounced.

在本文中，我们讨论了二维计算研究的结果，该研究涉及热电子阴极发射在发射阴极（LaB ₆平板）附近形成负（反向）电势中的作用。考虑了两种排放行为模式-高压和低压模式。我们表明，负电势区域（对于发射阴极的电势区域）被一个半球包围，该半球由电场改变其方向的线所界定。该护套区域由于发射点在水平和垂直方向上的移动而变形。观察到高压放电的不稳定行为和等离子体参数的自激振荡。在低压下，电位反转和振荡并不那么明显。