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引言采用氧化钡热阴极的高压真空管与没有这种阴极的高压真空管相比,耐压强度通常要差。这是由于钡和氧化钡(或者单纯的氧化钡)沉积在电极上,降低了金属表面的逸出功,从而使场致发射电流增加和击穿电压减小的缘故。因此,来自氧化钡阴极的污染就成了影响高压真空管性能的一个重要因素。在实验中,我们对大面积电极和直流高压范围100～300千伏进行了研究。这个电压范围,迄今还没有人探索过。为了把钡污染的影响和其他因素的影响分开,电极处理完毕后装入一个真空容器中,先进行放电处理,然后在保持真空密封的条件下,把钡沉积在电极上。
INTRODUCTION High-pressure vacuum tubes using barium oxide hot cathodes have generally lower compressive strength than high-pressure vacuum tubes without such cathodes. This is due to the deposition of barium and barium oxide (or simply barium oxide) on the electrode, reducing the work function of the metal surface, thereby increasing the field emission current and reducing the breakdown voltage. Therefore, the pollution from the barium oxide cathode has become an important factor affecting the performance of high pressure vacuum tubes. In the experiment, we studied the large area electrode and DC high voltage range of 100 ~ 300 kV. This voltage range has so far not been explored by anyone. In order to separate the effect of barium contamination from other factors, the electrode was processed and filled into a vacuum vessel, first subjected to a discharge treatment, and then barium was deposited on the electrode while keeping the vacuum tight.