Author/Authors :
Gogami، نويسنده , , T. and Asaturyan، نويسنده , , A. and Bono، نويسنده , , J. and Baturin، نويسنده , , P. and Chen، نويسنده , , C. and Chiba، نويسنده , , A. and Chiga، نويسنده , , N. and Fujii، نويسنده , , Y. and Hashimoto، نويسنده , , O. and Kawama، نويسنده , , D. and Maruta، نويسنده , , T. and Maxwell، نويسنده , , V. P. Mkrtchyan، نويسنده , , A. and Nagao، نويسنده , , S. and Nakamura، نويسنده , , S.N. and Reinhold، نويسنده , , J. and Shichijo، نويسنده , , A. and Tang، نويسنده , , L. and Taniya، نويسنده , , N. and Wood، نويسنده , , S.A. and Ye، نويسنده , , Z.، نويسنده ,
Abstract :
Aerogel and water Čherenkov detectors were employed to tag kaons for a Λ 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 for these detectors. These fields, which could not be easily passively shielded, would result in a lowered kaon detection efficiency if not mitigated. A bucking coil was placed on each photomultiplier tube to actively cancel this magnetic field, thus recovering kaon detection efficiency.
Keywords :
Active magnetic field canceling , Bucking coil , Photomultiplier tube , ?herenkov detector
