Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac

Pei-Yan Yu; Bin Zhang; Feng-Feng Wang; Chen-Xing Li; Guo-Zhen Sun; Zhi-Jun Wang; Lu-Bei Liu; Chen-Zhang Yuan; Yuan He; Hu-Shan Xu

doi:10.1007/s41365-020-00835-1

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Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | Updated：2021-02-22

- Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac
- Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac
- Nuclear Science and Techniques 2021年32卷第1期文章编号：8
- Affiliations：
  
  1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  2.School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  Corresponding author: zhangb@impcas.ac.cn
- Funds：
  
  NSAF Joint Foundation of China(U1730122)
- DOI：10.1007/s41365-020-00835-1
  中图分类号：
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Pei-Yan Yu, Bin Zhang, Feng-Feng Wang, 等. Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac[J]. Nuclear Science and Techniques, 2021,32(1):8

Pei-Yan Yu, Bin Zhang, Feng-Feng Wang, et al. Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac[J]. Nuclear Science and Techniques, 2021,32(1):8
Pei-Yan Yu, Bin Zhang, Feng-Feng Wang, 等. Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac[J]. Nuclear Science and Techniques, 2021,32(1):8 DOI： 10.1007/s41365-020-00835-1.

Pei-Yan Yu, Bin Zhang, Feng-Feng Wang, et al. Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac[J]. Nuclear Science and Techniques, 2021,32(1):8 DOI： 10.1007/s41365-020-00835-1.

摘要

Abstract

A 325 MHz aluminum prototype of a spatially periodic rf quadrupole focusing linac was developed at the Institute of Modern Physics, Chinese Academy of Sciences, as a promising candidate for the front end of a high-current linac. It consists of an alternating series of crossbar H-type drift tubes and rf quadrupole sections. Owing to its special geometry, cavity fabrication is a major hurdle for its engineering development and application. In this paper, we report the detailed mechanical design of this structure and describe its fabrication process, including machining, assembly, and inspection. The field distribution was measured by the bead-pull technique. The results show that the field errors of both the accelerating and focusing fields are within an acceptable range. A tuning scheme for this new structure is proposed and verified. The cold test process and results are presented in detail. The development of this prototype provides valuable guidance for the application of the spatially periodic rf quadrupole structure.

关键词

Keywords

Spatially periodic rf quadrupole focusing linacMechanical structure designBead-pull measurement

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