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

Cable attenuation study of Tibet water Cherenkov muon detector array-A 1 corresp first-author Corresponding author. E-mail address: gouqb@ihep.ac.cn Corresponding author. E-mail address: gouqb@ihep.ac.cn gouqb@ihep.ac.cn 1 1 1 2 1 3 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China Department of Physics, Shandong University, Jinan 250100, China Department of Physics, Shandong University, Jinan 250100, China Department of Physics, Hebei Normal University, Shijiazhuang 050016, China Department of Physics, Hebei Normal University, Shijiazhuang 050016, China 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. Tibet MD-A detector Signal attenuation Terminal reflection References Amenomori M , Bi X J , Chen D , et al . APJ , 2009 , 711 : 119 - 124 . APJ Amenomori M , Bi X J , Chen D , et al . AIP Conf. Proc . 2009 , 1085 : 723 - 726 . AIP Conf. Proc http://www.globalspec.com/reference/14847/160210/Chapter-4-Electromagnetic-Compatibility-and-Medical-Devices-Puls-Reflection-and-Termination-Techniques Stuchly M A , Stuchly S S . IEEE Trans Instrum Meas , 1980 , IM-29 : 176 - 183 . IEEE Trans Instrum Meas 10.13538/j.1001-8042/nst.22.230-234 2011-05-09 2011-08-20 2021-01-19 2011 Nuclear Science and Techniques 04 22