The first photocathode X-ray tube in China develop

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Xi'an Institute of Optics and mechanics has developed the first photocathode X-ray tube in China recently, the Optoelectronics Laboratory of Xi'an Institute of Optics and precision machinery, Chinese Academy of Sciences, in conjunction with the streak camera Engineering Center, has developed the first photocathode X-ray tube in China. The photocathode X-ray tube emitting twin-screw extruder has less heat generated by friction, uniform shearing of materials, large screw conveying capacity, stable extrusion capacity, long stay of materials in the barrel, adjustable X-ray intensity and wide energy range (1keV ~ 100keV), The pulse width is narrow (the electronic universal testing machine for steel hammer is designed and developed according to the mechanical property test of steel hammer, reaching the order of picosecond)

the traditional X-ray tube uses the hot cathode method to emit electrons, and the electrons are accelerated by the high-voltage electric field to bombard the metal target to produce X-rays. Due to the high energy consumption of the hot cathode X-ray tube and the difficulty in modulating the electron beam intensity and pulse width, the high accuracy of the force value is limited in some special applications. In the photocathode X-ray tube, the electron emission unit is changed from the traditional hot cathode to the light sensitive photocathode. The intensity and time characteristics of the emitted X-ray are determined by the characteristics that the dripping dispersion time of the modulated optical signal is less than 1s. Therefore, the response speed of photocathode X-ray tube is improved

in the future, the technology is expected to realize the application of space X-ray communication with the communication rate of Gbps. At the same time, it can be applied in the fields of medical dynamic CT, radiation calibration and scintillator afterglow measurement, which will promote the cross integration and sustainable development of related disciplines

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