论文标题
GERDA低背景低温恒温器的设计和性能用于水中
Design and Performance of the GERDA Low-Background Cryostat for Operation in Water
论文作者
论文摘要
在寻找$^{76} $ ge的中准led双β衰减时，在Infn Laboratori nazionali del Gran Sasso进行的锗探测器阵列（GERDA）实验实现了前所未有的低于10 $^{-3} $ cts/（kev $ cts/kev $ yr的cdot $ yr）的前所未有的低背景。它利用了基于浸入水箱中的液态贵重气体的大低温恒温器，它首先实现了一种新型的屏蔽概念。锗探测器是在液体氩气中没有封装的。氩气和水将环境背景从实验室和低温恒温器建筑材料屏蔽到可以忽略的水平。同时，各种实验也采用了相同的方法。本文概述了64 m $^3 $液体氩低温恒温器及其相关基础架构的设计和操作体验。讨论包括与水箱中大型低温恒温器操作相关的具有挑战性的安全问题。
In searching for the neutrinoless double-beta decay of $^{76}$Ge the GERmanium Detector Array (GERDA) experiment at the INFN Laboratori Nazionali del Gran Sasso has achieved an unprecedented low background of well below 10$^{-3}$ cts/(keV$\cdot$kg$\cdot$yr) in the region of interest. It has taken advantage of the first realization of a novel shielding concept based on a large cryostat filled with a liquid noble gas that is immersed in a water tank. The germanium detectors are operated without encapsulation in liquid argon. Argon and water shield the environmental background from the laboratory and the cryostat construction materials to a negligible level. The same approach has been adopted in the meantime by various experiments. This paper provides an overview of the design and operating experience of the 64 m$^3$ liquid argon cryostat and its associated infrastructure. The discussion includes the challenging safety issues associated with the operation of a large cryostat in a water tank.
