分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-11-10
摘要: We take the JUNO experiment as an example to explore nuclearites in the future large liquid scintillator detector. Comparing to the previous calculations, the visible energy of nuclearites across the liquid scintillator will be reestimated for the liquid scintillator based detector. Then the JUNO sensitivities to the nuclearite flux are presented. It is found that the JUNO projected sensitivities can be better than 7.7×10−17cm−2s−1sr−1 for the nuclearite mass 1015 GeV ≤ M ≤ 1024 GeV and initial velocity 10−4 ≤ β0 ≤ 10−1 with a 20 year running. Note that the JUNO will give the most stringent limits for downgoing nuclearites with 1.6 × 1013 GeV ≤ M ≤ 4.0 × 1015 GeV and a typical galactic velocity β0 = 10−3.
分类: 物理学 >> 核物理学 提交时间: 2016-08-31
摘要: The quality of PMT signal is one of the key items for a large and high precision neutrino experiment, like Daya Bay, JUNO, while most of the experiments are affected by the PMT signal overshoot from its positive HV-single cable scheme. For JUNO prototype detector, we have a detailed study on the PMT overshoot and successfully reduced the ratio of overshoot amplitude to signal to ~1% from previous typical ~10%, with no affection to PMT other parameters. Furthermore, we calculated that the overshoot is a result of discharging of capacitors in the HV-signal splitter and the PMT voltage divider. The study result is extremely important for JUNO and other similar experiments.