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Bucking Coil Implementation on PMT for Active Cancelling of Magnetic Field

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arxiv 1307.0896 v1 pith:UBKGEBMZ submitted 2013-07-03 physics.ins-det

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
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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
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classification physics.ins-det
keywords fieldkaonbuckingcoildetectiondetectorsefficiencymagnetic
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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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