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The efficiency measurement of the Water Cerenkov Counter for E18. SUNJI KIM, H. BHANG, M. KIM, K. TSHOO, K. TANIDA, H. FUJIOKA 1 , Y. SADA 1 , and H. ASANO 1 Seoul National University, 1 Kyoto University. Abstract.
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SUNJI KIM, H. BHANG, M. KIM, K. TSHOO, K. TANIDA, H. FUJIOKA1, Y. SADA1, and H. ASANO1
Seoul National University, 1Kyoto University
We have developed a Water Cerenkov(WČ) Counter, which is to be used in the E18 experiment at J-PARC (Japan Proton Accelerator Research Complex), in order to veto the protons produced from the kaon induced reaction on the 12C target. The WČ Counter will be used coupled with the (π+,K+) trigger counters which consist of the time of flight(TOF) counter, the Lucite Cerenkov(LC) counter, and the Aerogel Cerenkov(AC) counter. The contents of the kaons in the (π+,K+) trigger events were only a couple of percent in the previous E508 experiment at KEK (High Energy Accelerator Research Organization) due to the contamination of the protons. With the inclusion of the WČ Counter the inner size of 1x8x15cm3, we will be able to improve the data acquisition rate of the kaons drastically in the (π+,K+) trigger events for 12C(π+,K+)12ΛC reaction at least more than 10 times.
The test experiment of the WČ Counter was performed with 450MeV positron beam at ‘Research Center for Electron and Photon Science’ in Tohoku University of Japan. As a result of the experiment, on average, about 18 photo-electrons(p.e.) were detected, and it had more than 99% Cerenkov light detection efficiency.
◈ Motivation of WČ Counter inclusion
◈ WČ Counter Structure
Experiment & Results
◈Single photo-electron measurement
(LED calibration) @SNU
b. Position dependence measurement with 2”PMT
◈ WČ counter test for new reflector @SNU
for 2”PMT(H6410) –absorber : A4 paper
c. Angle dependence measurement with 2”PMT
d. Position dependence measurement with 3”PMT
◈ WČ counter test
@Research Center for electron and photon science
◈ WČ counter test for different PMT heights
e. The number of p.e. at the center of the water box
Seoul National University
Department of Physics & Astronomy
The World Class University
Intermediate Energy Physics Laboratory