Characteristics of electron gun used in the accelerator for customs inspection systems

The paper introduces the characteristics of the electron gun used in the 9MeV traveling wave electron linear accelerator for fixed customs container inspection system. Wigh the scandate cathode, the electron gun meets the accelerator characteristics with the whole system not needing high-temperature roasting to degas. The electron gun can work normally at a vacuum of about 10- 5Pa and can be reinstalled after exposure to air. In the accelerator, the electron gun emits a beam which strikes the target to produce an X-ray beam with a dosage rate of over 30Gy/(min× m) and a beam focus spot of less than f 2mm. The EGUN code is used to simulate the structure and properties of the electron gun. The reference size debugging parameters for replacing the electron gun are given for assembly requirem