Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (4): 230-234 doi: 10.13538/j.1001-8042/nst.22.230-234


Cable attenuation study of Tibet water Cherenkov muon detector array-A

GOU Quanbu1,GUO Yiqing1 LIU Cheng1 QIAN Xiangli1,2 HOU Zhengtao1,3   

  1. 1Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China 2Department of Physics,Shandong University,Jinan 250100,China 3Department of Physics,Hebei Normal University,Shijiazhuang 050016,China
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GOU Quanbu, GUO Yiqing, LIU Cheng, QIAN Xiangli, HOU Zhengtao. Cable attenuation study of Tibet water Cherenkov muon detector array-A.Nuclear Science and Techniques, 2011, 22(4): 230-234     doi: 10.13538/j.1001-8042/nst.22.230-234


This work aims at online calibration of signal attenuation of the long cable used in Tibet water Cherenkov muon detector array-A (Tibet MD-A) under the Tibet air shower array.Based on a waterproof connection of the signal cable to PMT (R3600_06) and characters of the high voltage divider,terminal reflection method is used for measuring the signal attenuation with a practical way to eliminate contribution of the pulse baseline.Comparison measurement data-taking method (with charge-to-digital conversion) was carried out by using open-ended cables,confirming that terminal reflection method is a fast and convenient,and suitable to online calibration of the signal attenuation for Tibet MD-A.At 26℃,the measured attenuation coefficient with the 250-m cable connected permanently to the PMT,was ~13.9%.The cable frequency response was measured by using the sinusoidal signals.The method could be used to study time dispersion of signals produced with Tibet MD-A detector via Fourier analysis.

Key words: Tibet MD-A detector, Signal attenuation, Terminal reflection