MgO冷陰極におけるパルス電流の立上り特性

抄録

Various kinds of magnesium oxide film cold cathode are made and their pulse current charac-teristics are studied.
When rectangular voltage is applied to the collector while the sustain current is on, the built-up current increases till the next stable state is reached. In this unstable period, two kinds of time lag are observed: one is the time lag during which the current remains unchanged, the other is the time spent from the start of the current increase to the stable state. The former seems mostly statistical time lag of fluctuous and accidental nature, while the latter is the forma-tive time lag-the accumulation of positive space charge in MgO raises the internal potential and leads to the formation of a new stable potential distribution reminding of the mechanism of charg-ing a condenser through high resistance.
Amount of the total time lag, which often reaches to several mili sec., depends on how MgO film is prepared. It is important to go into the process of preparation for shortening the time lag.