大面积双相LAr电子倍增器时间投影室的首次工作和漂移场特性
First operation and drift field performance of a large area double phase LAr Electron Multiplier Time Projection Chamber with an immersed Greinacher high-voltage multiplier
摘要：
我们已经运行了一个液氩大电子倍增器时间投影室（LAr LEM-TPC），其大的有效面积为76 $\times$ 40 cm $^2$和漂移长度为60 cm。这种设置代表了有史以来最大的腔室实现了这种新颖的探测器概念。该室配备有浸入式内置低温Greinacher多级高压（HV）倍增器，当受到$\sim$ 1 kV $_{\mathrm{pp}}$的外部AC HV时，其在LAr容器内静态充电至高出$\sim$ 30倍的电压，在整个漂移长度上产生$\sim$ 0.5 kV/cm的均匀漂移场。这个大型LAr LEM-TPC在双相（液-气）运行模式下成功运行，并在$\sim$ 1个月的时间内进行了测试，记录了令人印象深刻的宇宙粒子穿越或在敏感体积中相互作用的非常高质量的三维图像。双相位读出和高压系统在低温条件下实现了稳定的工作，显示了其良好的特性，特别适合下一代巨型LAr-TPC的应用。
英文摘要：
We have operated a liquid-argon large-electron-multiplier time-projection chamber (LAr LEM-TPC) with a large active area of 76 $\times$ 40 cm$^2$ and a drift length of 60 cm. This setup represents the largest chamber ever achieved with this novel detector concept. The chamber is equipped with an immersed built-in cryogenic Greinacher multi-stage high-voltage (HV) multiplier, which, when subjected to an external AC HV of $\sim$1 kV$_{\mathrm{pp}}$, statically charges up to a voltage a factor of $\sim$30 higher inside the LAr vessel, creating a uniform drift field of $\sim$0.5 kV/cm over the full drift length. This large LAr LEM-TPC was brought into successful operation in the double-phase (liquid-vapor) operation mode and tested during a period of $\sim$1 month, recording impressive three-dimensional images of very high-quality from cosmic particles traversing or interacting in the sensitive volume. The double phase readout and HV systems achieved stable operation in cryogenic conditions demonstrating their good characteristics, which particularly suit applications for next-generation giant-scale LAr-TPCs.
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