论文标题
研究Juno中3英寸PMT仪器的前端信号的研究
Study of the front-end signal for the 3-inch PMTs instrumentation in JUNO
论文作者
论文摘要
25,600 3英寸PMT将安装在江门地下中微子天文台（JUNO）中，以实现更精确的能量校准并扩展物理检测潜力。所有裸露的PMT的表演都已表征，这些PMT正在用高压分隔器，水下前端电缆和连接器进行仪器。在本文中，我们介绍了仪器不同阶段信号质量的专门研究。确认并最终确定了优化的高电压比，从而提高了PMT运输时间的扩展25％。在10 m（5 m）电缆中，信号电荷减弱了22.5％（13.0％），并需要添加45 V（23 V）以补偿PMT增益的损失。 PMT信号之后有1％的过冲，并且连接器中没有反射迹象。一组具有完整仪器的16个3英寸PMT与几个8英寸和20英寸PMT一起安装在Juno Prototype检测器中，该仪表良好稳定性，并展示了具有多种PMT的光子检测系统。
25,600 3-inch PMTs will be installed in Jiangmen Underground Neutrino Observatory (JUNO) to achieve more precise energy calibration and to extend the physics detection potential. Performances of all bare PMTs have been characterized and these PMTs are being instrumented with the high voltage divider, underwater front-end cable, and connector. In this paper, we present a dedicated study on signal quality at different stages of the instrumentation. An optimized high voltage ratio was confirmed and finalized which improved the PMT transit time spread by 25%. The signal charge was attenuated by 22.5% (13.0%) in the 10 m (5 m) cable and it required the addition of 45 V (23 V) to compensate for the loss of PMT gain. There was a 1% overshoot following the PMT signal and no sign of reflection in the connector. A group of 16 3-inch PMTs with the full instrumentation was installed in the JUNO prototype detector together with a few 8-inch and 20-inch PMTs, which showed good stability and demonstrated a photon detection system with multiple types of PMTs.
