Studies On Diagnostic Technology Of Spot Size Of High Energy X-ray Source

High-energy X-ray can be used to diagnose interior structure of high density object, it is widely used in diverse fields, such as industry, national defence, and scientific research.For obtaining high-powered X-ray sources, Institute of Fluid Physics, CAEP, has constructed several linear induction accelerators, for example the 12MeV LIA, Dragon-?, and Dragon-?. High-energy X-ray pulses were obtained via electron beams hit high Z metal targets.X-ray spot size is one of important parameter of X-ray sources; it is vital index for judging accelerator performance, and it determines the resolving power of imaging system. With the development of high-energy flash radiography technology, X-ray spot size diagnosis is facing huge challenge, especially for high rep-rate hard X-ray pulse. It is an important topic for measuring spot size accurately in high-energy flash radiography technology.The research of this paper focused on three aspects, diagnostic technologies of high-energy X-ray spot size, detectors for high-energy X-ray image, and diagnostic experiments of high-energy X-ray spot size. The diagnostic technologies include the theory and error analysis of pinhole method, square hole method, rolled bar method, and so on. Detectors for high-energy X-ray imaging were designed according to analysis of different imaging detector, and it makes resolved-time diagnosis of X-ray spot size possible. Spot sizes are obtained for 1MV RPD, dragon-?, dragon-? accurately in institute of Fluid Physics.