液氬模型探測器預研進展研究

楊長根 關夢云

摘 要：液氬探測器是一種被廣泛使用的粒子物理探測技術，在加速器實驗中早就被用于粒子探測，如，Atlas實驗、D0實驗的量能器，在未來實驗中可以應用在探測太陽中微子、超新星中微子、長基線中微子、暗物質、質子衰變等新物理中，如，LBNE等中微子實驗、ArDM、DEAP/CLEAN及Darkside等幾代暗物質探測實驗。液氬發光機制本身具備約億倍的中子-伽瑪分辨能力，遠遠超過了其他閃爍材料，對尋找稀有事例的暗物質探測非常重要，目前液氬這項多用途的探測器技術在國內還沒有發展起來。研究的一個重要方面是致力于基于國內工業水平來研制液氬探測器，以期掌握探測器核心技術和降低研制成本。我們將基于液氮制冷的原理研制高溫度穩定水平的探測器低溫系統，基于國產鋯基吸氣劑研制高潔凈度的氬氣凈化系統，用低溫光電倍增管作為信號讀出設備，測量液氬探測器的閃爍光，進行物理研究。該文報告液氬模型探測器預研的相關進展。

關鍵詞：暗物質 液氬探測器 低溫

Progress of R&D on Prototype Liquid Argon Detector

Yang Changgen Guan Mengyun

（Institute of High Energy Physics， Chinese Academy of Sciences）

Abstract：Liquid argon （LAr） detectors have been widely applied in particle physics. It is used in accelerator experiments for particle discovery， such as the ATLAS and the D0 calorimeter. It is being used in experiments searching for new physics， such as solar， supernova， long baseline neutrino experiments， dark matter and proton decay experiments， Such as neutrino experiment LBNE， dark matter experiments ArDM， DEAP/CLEAN and DarkSide. LAr detectors have about a hundred million times neutron/gamma particle discrimination capability， which is better than any other scintillation materials. The neutron/gamma discrimination capability is a determinative characteristic of detectors for rare events searching experiments. However， liquid argon multipurpose detector technology has not yet been developed in China. We aimed on developing liquid argon detector by the support of the 973 project. Domestic materials and industry technology will be adopted preferentially. We plan to build cryogenic system with high stability and good reliability based on the principle of liquid nitrogen cryocooler， and to develop argon purifying system with ultra-low impurity concentration based on domestic Zr hot getter， Combining with commercial PMTs as the signal readout device， we can put together a liquid argon detector prototype for physics study. This report described the progress of R&D on prototype liquid argon detector.

Key Words：Dark matter； Liquid argon detector； Cryostat

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