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.
Cite
@article{arxiv.1602.06080,
title = {PMT overshoot study for JUNO prototype detector},
author = {F. J. Luo and Y. K. Heng and Z. M. Wang and P. L. Wang and Z. H. Qin and M. H. Xu and D. H. Liao and H. Q. Zhang and X. C. Lei and S. Qian and S. L. Liu and Y. B. Chen and Y. F. Wang},
journal= {arXiv preprint arXiv:1602.06080},
year = {2016}
}