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The non-uniformity study under geo-magnetic field of 20-inch MCP-PMT for LHAASO

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Abstract

Purpose

The large diameter photon sensors are widely applied in astroparticle physics and neutrino physics experiment. Due to its large size, the geo-magnetic effect cannot be ignored. In this work, one 20-inch MCP-PMT are scanned under geo-magnetic field and magnetic shielding environment, and finally, the multi-parameter scanning results are given.

Method

In order to evaluate the response of MCP-PMTs, an automatic spherical scanning system based on stepper motor and quartz fiber was established. A comprehensive multi-point scanning was performed on the entire 20-inch MCP-PMT, and a multi parameter data scanning model was established. Our self-developed magnetic shielding was used to demonstrate the improvement of magnetic shielding on the ratio of signals, charge uniformity, and time characteristics of the 20-inch MCP-PMT.

Results

By comparing the results with and without magnetic shielding, it can be concluded that with magnetic shielding, the variation in charge spectrum and the ratio of signals are relatively smaller. At the same time, the composition of photon time spectrum has become simpler. The relative transit time and time spread of photons are reduced to a certain extent, and the uniformity of both is also improved.

Conclusion

The use of magnetic shielding has improved the various performance of MCP-PMT, preparing for future LHAASO and other experiments.

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Acknowledgements

This work is supported by the Department of Science and Technology of Sichuan Province under Grant 2021YFSY0030.

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Authors and Affiliations

  1. Zhengzhou University, Zhengzhou, 450001, China

    C. C. Liu & S. X. Lu

  2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    C. C. Liu, B. Gao, M. J. Chen, X. H. You, K. Li, Lin Liu & W. K. Gao

  3. TIANFU Cosmic Ray Research Centre, 1500 Ke Zhi Road, Chengdu, China

    C. C. Liu, B. Gao, M. J. Chen, X. H. You, K. Li, Lin Liu & W. K. Gao

  4. University of Chinese Academy of Sciences, Beijing, 100043, China

    W. K. Gao

Authors
  1. C. C. Liu
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  2. B. Gao
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  3. S. X. Lu
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  4. M. J. Chen
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  5. X. H. You
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  6. K. Li
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  7. Lin Liu
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  8. W. K. Gao
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Corresponding authors

Correspondence to B. Gao or S. X. Lu.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

Appendices

Appendix A

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The Ros under gradually increasing 11 sets of light intensities without/with shielding

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Appendix B

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Fig. 16
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The weighted charge under gradually increasing 11 sets of light intensities without/with shielding

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Appendix C

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Fig. 17
figure 17

The transit time under gradually increasing 11 sets of light intensities without/with shielding

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Liu, C.C., Gao, B., Lu, S.X. et al. The non-uniformity study under geo-magnetic field of 20-inch MCP-PMT for LHAASO. Radiat Detect Technol Methods (2024). https://doi.org/10.1007/s41605-024-00451-2

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  • DOI: https://doi.org/10.1007/s41605-024-00451-2

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