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.
@article{arxiv.1307.0896,
title = {Bucking Coil Implementation on PMT for Active Cancelling of Magnetic Field},
author = {T. Gogami and A. Asaturyan and J. Bono and P. Baturin and C. Chen and A. Chiba and N. Chiga and Y. Fujii and O. Hashimoto and D. Kawama and T. Maruta and V. Maxwell and A. Mkrtchyan and S. Nagao and S. N. Nakamura and J. Reinhold and A. Shichijo and L. Tang and N. Taniya and S. A. Wood and Z. Ye},
journal= {arXiv preprint arXiv:1307.0896},
year = {2015}
}