Development of short prototype of dual aperture quadrupole magnet for CEPC ring

Mei Yang; Fu-San Chen; Ya-Feng Wu; Zhuo Zhang; Bao-Gui Yin; Bin Na; Zhan-Jun Zhang

doi:10.1007/s41365-023-01255-7

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Development of short prototype of dual aperture quadrupole magnet for CEPC ring

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2023-08-16

- Development of short prototype of dual aperture quadrupole magnet for CEPC ring
- Nuclear Science and Techniques Vol. 34, Issue 7, Article number: 103(2023)
- Affiliations：
  
  1.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 10049, China
  2.Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
  4.Beijing HE-Racing Technology Co., Ltd, Beijing 1000049, China
- Author bio：
  
  * yangmei@ihep.ac.cn
- Funds：
- DOI：10.1007/s41365-023-01255-7
  CLC：
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Mei Yang, Fu-San Chen, Ya-Feng Wu, et al. Development of short prototype of dual aperture quadrupole magnet for CEPC ring. [J]. Nuclear Science and Techniques 34(7):103(2023)
DOI：

Mei Yang, Fu-San Chen, Ya-Feng Wu, et al. Development of short prototype of dual aperture quadrupole magnet for CEPC ring. [J]. Nuclear Science and Techniques 34(7):103(2023) DOI： 10.1007/s41365-023-01255-7.

摘要

Abstract

Main quadrupole magnets are critical for the Circular Electron and Positron Collider (CEPC), and are specifically designed as dual aperture quadrupole (DAQ) magnets. However, the field crosstalk between the two apertures presents challenges. As the CEPC will work at four beam energies of Z, W, Higgs and ttbar mode, the DAQ magnets will operate at four field gradients spanning from 3.18 to 12.63 T/m. The first short quadrupole magnet prototype with the bore diameter of 76 mm and magnetic length of 1.0 m revealed the problems of large magnetic field harmonics and a magnetic center shift within the beam energy range. Accordingly, a compensation method was proposed in this work to solve the field crosstalk effect. By adjusting the gap height at the middle of the two apertures, the field harmonics and magnetic center shift are significantly reduced. After optimization, the short prototype was modified using a new scheme. The field simulations are validated from the magnetic measurement results. Further, the multipole field meets the requirements at the four beam energies. The detailed magnetic field optimization, field harmonics adjustment, and measurement results are presented herein.

关键词

Keywords

Dual aperture magnetsField measurementsCrosstalk effectQuadrupole magnetField harmonicsCEPC

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