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A rotating coil measurement system based on CMM for high-gradient small-aperture quadrupole in HEPS-TF

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Abstract

Purpose

A new rotating coil measurement system based on the coordinate measurement machine (CMM) is developed for measuring high-gradient small-aperture quadrupole magnet in the Test Facility of High Energy Photon Source (HEPS-TF).

Methods

The CMM and two groups of Newport translate stages are combined to align the rotating coil relative to the magnet mechanical center. A high precision ceramic skeleton with bucked coil is made as a measurement sensor. The integrated field gradient, harmonics, magnetic center offset and excitation curve of a high-gradient small-aperture quadrupole prototype magnet are measured.

Results

The rotating coil is aligned to the magnet mechanical center within 10 μm. The reproducibility of higher harmonics is within 0.2 × 10–4. The repeatability of the magnet center in horizontal direction is under 1.5 μm, while that in vertical direction is less than 2.5 μm in different days. The architecture of the measurement system, the measuring procedure and some primary results of the quadrupole prototype magnet are illustrated in this paper.

Conclusion

A rotating coil measurement system based on CMM has been well developed, and the collimation efficiency and precision are improved. The harmonic changes caused by iron fingers are measured by the measurement system. The difference between the measurement result and the OPERA-3D simulation result is less than 0.5 × 10–4. The performance of this measurement system can meet the magnet measurement requirements of HEPS-TF.

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Acknowledgement

The authors would like to thank all the IHEP staff for working on the magnetic measurement and giving advices on the measurement system. This work was supported in part by the Test Facility of High Energy Photon Source and in part by the Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences.

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Authors and Affiliations

  1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Science, Beijing, 1000049, China

    Mei Yang, Fusan Chen, Baogui Yin, Ran Liang & Yingshun Zhu

  2. China Spallation Neutron Source, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan, 523803, China

    Shuai Li

  3. Dongguan Neutron Science Center, Dongguan, 523808, China

    Shuai Li

  4. University of Chinese Academy of Sciences, Beijing, 100049, China

    Mei Yang & Fusan Chen

Authors
  1. Mei Yang
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  2. Fusan Chen
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  3. Baogui Yin
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  4. Ran Liang
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  5. Shuai Li
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  6. Yingshun Zhu
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Corresponding author

Correspondence to Mei Yang.

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Yang, M., Chen, F., Yin, B. et al. A rotating coil measurement system based on CMM for high-gradient small-aperture quadrupole in HEPS-TF. Radiat Detect Technol Methods 5, 8–14 (2021). https://doi.org/10.1007/s41605-020-00211-y

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  • DOI: https://doi.org/10.1007/s41605-020-00211-y

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