Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (3): 50 doi: 10.1007/s41365-019-0561-y

• ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Beam and image experiment of beam deflection electron gun for distributed X-ray sources

Cheng-Jun Tan1,2 • Chuan-Xiang Tang1,2 • Wen-Hui Huang1,2 • Qing-Xiu Jin1,2 • Ying-Chao Du1,2 • Qun Luo3 • Pei-Dong Wu3 • Dong-Hai Liu3 • Lu-Ming Zhang3 • Cong Xu3   

  1. 1 Accelerator Laboratory, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    2 Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Tsinghua University, Beijing 100084, China
    3 Nuctech Company Limited, Beijing 100084, China
  • Received:2018-05-04 Revised:2018-09-12 Accepted:2018-09-13
  • Contact: Chuan-Xiang Tang; Cheng-Jun Tan;
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Cheng-Jun Tan, Chuan-Xiang Tang, Wen-Hui Huang, Qing-Xiu Jin, Ying-Chao Du, Qun Luo, Pei-Dong Wu, Dong-Hai Liu, Lu-Ming Zhang, Cong Xu. Beam and image experiment of beam deflection electron gun for distributed X-ray sources.Nuclear Science and Techniques, 2019, 30(3): 50     doi: 10.1007/s41365-019-0561-y

Abstract: X-ray sources comprise a single vacuum chamber containing multiple X-ray sources that are triggered and emit X-rays at a specific time and location. This process facilitates an application for innovative system concepts in X-ray and computer tomography. This paper proposes a novel electron beam focusing, shaping, and deflection electron gun for distributed X-ray sources. The electron gun uses a dispenser cathode as an electron emitter, a mesh grid to control emission current, and two electrostatic lenses for beam shaping, focusing, and deflection. Novel focusing and deflecting electrodes were designed to increase the number of focal spots in the distributed source. Two identical half-rectangle opening electrodes are controlled by adjusting the potential of the two electrodes to control the electron beam trajectory, and then, multifocal spots are obtained on the anode target. The electron gun can increase the spatial density of the distributed X-ray sources, thereby improving the image quality. The beam experimental results show that the focal spot sizes of the deflected (deflected amplitude 10.5 mm) and non-deflected electron beams at full width at half maximum are 0.80 mm × 0.50 mm and 0.55 mm × 0.40 mm, respectively (anode voltage 160 kV; beam current 30 mA). The imaging experimental results demonstrate the excellent spatial resolution and time resolution of an imaging system built with the sources, which has an excellent imaging effect on a field-programmable gate array chip and a rotating metal disk.

Key words: Beam deflection electron gun, X-ray imaging, Distributed X-ray sources, Stationary CT