Cryogenic CMOS cameras for high voltage monitoring in liquid argon

The prevalent use of large volume liquid argon detectors strongly motivates the development of novel readout and monitoring technology which functions at cryogenic temperatures. This paper presents the development of a cryogenic CMOS camera system suitable for use inside a large volume liquid argon detector for online monitoring purposes. The characterisation of the system is described in detail. The reliability of such a camera system has been demonstrated over several months, and recent data from operation within the liquid argon region of the DUNE 35 t cryostat is presented. The cameras were used to monitor for high voltage breakdown inside the cryostat, with capability to observe breakdown of a liquid argon time projection chamber in situ. They were also used for detector monitoring, especially of components during cooldown.

大容量液氩探测器的广泛使用极大地推动了在低温下运行的新型读出和监测技术的发展。本文介绍了一种适用于大容量液氩探测器内部用于在线监测目的的低温CMOS相机系统的研发。详细描述了该系统的特性。这种相机系统的可靠性已经过数月的验证，并且展示了来自DUNE 35吨低温恒温器液氩区域内运行的最新数据。这些相机被用于监测低温恒温器内部的高压击穿情况，能够原位观察液氩时间投影室的击穿。它们还被用于探测器监测，特别是在冷却过程中的部件监测。