纵磁场中真空扩散型电弧阴极斑点的分裂和运动

在作者的实验条件下观察发现:真空扩散型的阴极班点开始分裂的临界电流随纵磁场的增大而减小;而且阴极斑点群在纵磁场的影响下动态地接近均匀分布于阴极表面一定的面积内,并在正弦半波电流峰值附近达到最大,而稍滞后于电流峰值;斑点群膨胀和收缩的速率呈现“双驼峰”特性。

Splitting and Movement of the Diffused Cathode Spot in Axial Magnetic Field in Vacuum

In the authors' experimental conditions it was found that the first splitting at instantaneous current value of the cathode spot decreases with increased axial magnetic field and the qroup of cathode spots under the influence of axial magnetic field were nearly uniformly distributed in dynamic form within a definite area on the cathode surface. It was also shown that the cathode spot covered area reached a maximum value which however slightly lagged behind the peak arc current and the group of the cathode spots expanded and contracated at the speed of the so-called "bihump" characteristics, i.e., the spots twice expandep at high speed before the maximum value of spot-covered area was reached. These experimental results are briefly discussed in this Paper.