Performance of the Microchannel Plate Type Photomultiplier Tube Under a Geomagnetic Field

Citation

Su, D., Ye, H., Sun, J., Si, S., Huang, G., Cao, Y., Qian, S., Li, S., Wang, X., Ren, L., & Ma, L. (2020). Performance of the Microchannel Plate Type Photomultiplier Tube Under a Geomagnetic Field. Infrared Technology, 42(8), 742–747.

Keywords

  • Microchannel plate type photomultiplier tubes (MCP-PMT)
  • Geomagnetic field
  • Focusing structure
  • Performance tests
  • Shielding
  • Large High Altitude Air Shower Observatory (LHAASO)

Brief

This article studies the performance of microchannel plate type photomultiplier tubes (MCP-PMT) in a geomagnetic field environment.

Summary

The article, published in 2020 in the journal "红外技术" (Infrared Technology), investigates the performance of microchannel plate type photomultiplier tubes (MCP-PMTs) under the influence of a geomagnetic field.

Here are some key findings:

  • Researchers tested two different focusing structure MCP-PMTs in a geomagnetic field environment using an electronic data acquisition system. They conducted tests for various performance parameters including: single photoelectron spectrum, afterpulse, transit time fluctuations, signal rise and fall time, and collection efficiency.
  • They observed that the performance of MCP-PMTs varies depending on the angle of the tube relative to the geomagnetic field. This is likely because the geomagnetic field influences the trajectory of electrons within the tube, affecting how effectively they are collected.
  • The article highlights that while traditional, small-sized MCP-PMTs are less susceptible to geomagnetic interference, larger ones are more affected due to the longer travel path of photoelectrons.
  • The authors suggest that the impact of the geomagnetic field on MCP-PMT performance should be considered, especially when dealing with larger tubes. They recommend using magnetic shielding or optimizing the placement of the MCP-PMT to mitigate these effects.

Origin: https://www.sciengine.com/doi/pdf/264DD1D3FEDC4D8187A92004055A1103

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