论文标题
液体氩气纯度监测器中不同光电座材料的性能
Performance of different photocathode materials in a liquid argon purity monitor
论文作者
论文摘要
纯度监视器设备越来越多地用于贵重气体时间投影室，以测量漂移电子的寿命。纯度通过光电效应从光电座材料中发出电子来监测工作。然后，通过施加的电漂移场将电子朝向阳极。通过测量阴极和阳极之间的电荷差，可以提取介质中漂流电子的寿命。我们首次测试了不同光电座材料（银，钛和铝）的性能，并将它们与黄金进行比较，这是用于纯度监测器的标准光导电材料。发现钛和铝在真空中的性能要比黄金差，而银的信号与金的信号相同。在银和金上进行了进一步的液体氩测试，得出的结论是，银产生的信号比黄金高三倍。
Purity monitor devices are increasingly used in noble gas time projection chambers to measure the lifetime of drifting electrons. Purity monitors work by emitting electrons from a photocathode material via the photoelectric effect. The electrons are then drifted towards an anode by means of an applied electric drift field. By measuring the difference in charge between the cathode and the anode, one can extract the lifetime of the drifting electrons in the medium. For the first time, we test the performance of different photocathode materials-- silver, titanium, and aluminium--and compare them to gold, which is the standard photocathode material used for purity monitors. Titanium and aluminium were found to have a worse performance than gold in vacuum, whereas silver showed a signal of the same order of magnitude as gold. Further tests in liquid argon were carried out on silver and gold with the conclusion that the signal produced by silver is about three times stronger than that of gold.
