High-speed two-frame gated camera for parameters measurement of Dragon-Ⅰ LIA

The time-resolved measurement system which can work at very high speed is necessary in electron beam parameter diagnosis for Dragon-Ⅰ linear induction accelerator（LIA）. A two-frame gated camera system has been developed and put into operation. The camera system adopts the optical principle of splitting the imaging light beam into two parts in the imaging space of a lens with long focus length. It includes lens coupled gated image intensifier, CCD camera, high speed shutter trigger device based on large scale field programmable gate array. The minimum exposure time for each image is about 3 ns， and the interval time between two images can be adjusted with a step of about 0.5 ns. The exposure time and the interval time can be independently adjusted and can reach about 1 s. The camera system features good linearity， good response uniformity， equivalent background illumination(EBI) as low as about 5 electrons per pixel per second, large adjustment range of sensitivity, and excellent flexibility and adaptability in applications. The camera system can capture two frame images at one time with the image size of 1 0241 024. It meets the requirements of measurement for Dragon-Ⅰ LIA.