Bucking Coil Implementation on PMT for Active Cancelling of Magnetic Field
T. Gogami, A. Asaturyan, J.Bono, P.Baturin, C. Chen, A. Chiba, N., Chiga, Y. Fujii, O. Hashimoto, D. Kawama, T. Maruta, V.Maxwell, A. Mkrtchyan,, S. Nagao, S. N. Nakamura, J. Reinhold, A. Shichijo, L. Tang, N. Taniya, S. A., Wood, Z. Ye
TL;DR
This paper describes the implementation of bucking coils on photomultiplier tubes to actively cancel magnetic fields, thereby improving kaon detection efficiency in a hypernuclear experiment at Jefferson Lab.
Contribution
The paper introduces a bucking coil setup on PMTs to effectively cancel magnetic interference in a high-energy physics detector environment.
Findings
Bucking coils reduced magnetic field at PMTs from ~5 Gauss to negligible levels.
Enhanced kaon detection efficiency due to active magnetic field cancellation.
Successful implementation in a real experimental setup at Jefferson Lab.
Abstract
Aerogel and water Cerenkov detectors were employed to tag kaons for a lambda hypernuclear spectroscopic experiment which used the (e,e'K+) reaction in experimental Hall C at Jefferson Lab (JLab E05-115). Fringe fields from the kaon spectrometer magnet yielded ~5 Gauss at the photomultiplier tubes (PMT) for these detectors which could not be easily shielded. As this field results in a lowered kaon detection efficiency, we implemented a bucking coil on each photomultiplier tubes to actively cancel this magnetic field, thus maximizing kaon detection efficiency.
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