Systematic study of hydrogenation in a diamond amplifier

We recently developed a reliable hydrogenation procedure for the diamond amplifier that assures the generation of a high-current, high-brightness beam. In this paper, we compare room-temperature hydrogenation with that at high temperatures. We identified the factors leading to the decay of quantum efficiency. The optimum temperature for heat treatment ranged from 400-450 degrees C; its superiority was proven in the gain test. Hydrogenated diamond amplifiers exposed to N(2) and air exhibited a good emission after being heated to 350 degrees C; the highest gain we registered in emission scanning was 178. Our systematic study of hydrogenation resulted in the reproducible fabrication of diamond amplifiers.