Bucking coil test @Kyoto (2016)
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Report by T. Gogami et al. (2016/4/8)
We are considering to implement
bucking coils on PMTs for the water
Cherenkov detector in order to avoid gain reductions of the PMTs due to
a stray-magnetic field from the S-2S dipole magnet.
The gain reduction of PMT would cause deteriorations of particle-detection
efficiency and background-rejection capability in S-2S.
There were a stray-magnetic field of approximately 5 G at positions of PMTs
for the water Cherenkov detector in a parallel direction to the PMT axis.
At first, we investigated an effect of magnetic field on a
H11284-100UV PMT,
which will be used for the water Cherenkov detector, by using a Helmholtz coil
yielding 10 G at maximum.
Then, we attemted to find an optimal setting of bucking coil to actively vanish
the magnetic field of 5 G.
Figs. 1 and 2 show a schematic drawing and a photograph of the experimental setup
for the bucking-coil test.
Fig. 1: A schematic drawing of the experimental setup of bucking coil test.
Fig. 2: A photograph of the experimental setup of bucking coil test.
Log notes
Data / Analysis code
Reports
- Document on 2016/02/05
(pdf)
(pptx)
Drawings of water Chernkov detector (final version (not prototype))
- Document on 2016/03/15
(pdf)
(pptx)
Preparation for magnetic-field measurement of S-2S D in KEK, LEAP2016 in Kanazawa, and water Cherenkov detector
- Document on 2016/03/28
(pdf)
(pptx)
Bucking-coil test with a Helmholtz coil
Photographs