High-Temperature Operation Method for Image Pickup Tube

This paper proposes a new operation method for an image pickup tube under high-temperature conditions. The landing energy of an electron beam is set at a value for the secondary electron yield above 1.0. The mesh electrode, which is located in front of the image plate, can act as a potential barrier and control the surface potential of the image plate in the balanced state, where secondary electron yield is 1.0. The polarity of signal charges can be also selected with the proposed method. These effects can suppress image degradation caused at high temperatures. We successfully demonstrated imaging operation around 100 °C.