论文标题
使用HE/CF $ _4 $燃气混合物的基于宝石的光学读数TPC的稳定性和检测性能
Stability and detection performance of a GEM-based Optical Readout TPC with He/CF$_4$ gas mixtures
论文作者
论文摘要
研究了基于三个气体电子倍增器的电子扩增结构的光学读数时间投影室的性能和长期稳定性。 HE/CF $ _4 $的气体混合物以两种不同的比例（60/40和70/30）使用，其中具有7升敏感体积的Cygno原型。通过提供非常相似的电子收益的电配置，两种混合物都发现了整个检测器体积的几乎完全检测效率，而发现60/40的光产率约为20 \％。通过在25天内监测电压和电流测试静电稳定性。该检测器在整个时期都非常稳定且安全。在较少CF $ _4 $的情况下，清楚地检测到了不稳定事件的较大概率。
The performance and long term stability of an optically readout Time Projection Chamber with an electron amplification structure based on three Gas Electron Multipliers was studied. He/CF$_4$ based gas mixtures were used in two different proportions (60/40 and 70/30) in a CYGNO prototype with 7 litres sensitive volume. With electrical configurations providing very similar electron gains, an almost full detection efficiency in the whole detector volume was found with both mixtures, while a light yield about 20\% larger for the 60/40 was found. The electrostatic stability was tested by monitoring voltages and currents during 25 days. The detector worked in very stable and safe condition for the whole period. In the presence of less CF$_4$, a larger probability of unstable events was clearly detected.
