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

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

doi:10.1007/s41365-019-0561-y

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

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2021-02-01

- Beam and image experiment of beam deflection electron gun for distributed X-ray sources
- Nuclear Science and Techniques Vol. 30, Issue 3, Article number: 50(2019)
- Affiliations：
  
  1.Accelerator Laboratory, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  2.Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
  3.Nuctech Company Limited, Beijing 100084, China
- Author bio：
  
  Corresponding author, tang.xuh@tsinghua.edu.cn
- Funds：
- DOI：10.1007/s41365-019-0561-y
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Cheng-Jun Tan, Chuan-Xiang Tang, Wen-Hui Huang, et al. Beam and image experiment of beam deflection electron gun for distributed X-ray sources. [J]. Nuclear Science and Techniques 30(3):50(2019)
DOI：

Cheng-Jun Tan, Chuan-Xiang Tang, Wen-Hui Huang, et al. Beam and image experiment of beam deflection electron gun for distributed X-ray sources. [J]. Nuclear Science and Techniques 30(3):50(2019) DOI： 10.1007/s41365-019-0561-y.

摘要

Abstract

Distributed 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 (CT). 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 multi-focal 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 (FWHM) 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 (FPGA) chip and a rotating metal disk.

关键词

Keywords

Beam deflection electron gunX-ray imagingDistributed X-ray sourcesStationary CT

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Shanghai Institute of Applied Physics, Chinese Academy of Sciences

Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences

School of Nuclear Science and Technology, Lanzhou University

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National Synchrotron Radiation Laboratory, University of Science and Technology of China

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