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Common iron passive magnetic shielding for scintillator array photomultiplier tubes
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DOI：10.1016/j.net.2026.104537.png)
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Abstract
En 中文
In accelerator-based experiments, detector arrays constructed from organic plastic scintillators are widely used for measurements of particle timing, hit position, and energy loss. These detectors are often operated in proximity to magnetic spectrometers, where the associated photomultiplier tubes (PMTs) are exposed to fringe magnetic fields. The standard approach to mitigate magnetic interference involves individually shielding each PMT, which is more effective in case the orientation of the magnetic field is transverse to the PMT axis. In this work, we present a combined passive shielding solution consisting of a common iron enclosure for a row of PMTs, supplemented with individual mu-metal cylinders. This configuration was deployed during a 2022 experiment at JINR, where the fringe magnetic field was mostly along the PMT axis. Performance evaluations show that the proposed shielding effectively preserves PMT gain and timing resolution, demonstrating its viability for future applications in similar experimental environments.
Keywords:
Passive magnetic shielding of PMTs
TOF
Scintillator
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