Belle II探测器的中性长寿命K介子和μ介子系统
Neutral long-living kaon and muon system of the Belle II detector
摘要：
1999-2010年在KEKb B工厂运行的Belle探测器是过去几十年基本粒子物理学领域最引人注目的实验之一。Belle的继任者Belle II合作项目旨在使SuperKEKb工厂的Belle II探测器的亮度提高40倍。增加的亮度对探测器元件提出了新的要求：它们必须在更高的辐射水平下生存，在更高的负载和更高的背景下工作。基于电阻板室（RPC）技术的Belle KL和μ子系统在整个数据采集期间工作良好，但在Belle II环境中，由于负载增加和高中子本底，其性能下降到可以忽略的水平。为了维持探测器的运行，将用新的系统取代它，新系统的基础是用硅光电倍增器读出闪烁带。后一种技术不仅可以达到1 ns的时间分辨率，还可以进行幅度测量。目前，新EKLM系统的元件正在生产中。科索沃能源公司的组装工作将于今年秋季开始。
英文摘要：
The Belle detector operated at KEKb B-factory in 1999-2010 was one of the most remarkable experiments in the field of elementary particle physics of the last decades. The Belle successor, Belle II collaboration, is aimed to operate the Belle II detector at SuperKEKb factory at 40 times higher luminosity. Increased luminosity imposes new requirements on the detector elements: they have to survive at higher radiation levels, to operate at higher loads and at higher backgrounds. The Belle K_L and muon system based on the resistive plate chambers (RPC) technology worked well during all data taking period, however at Belle II environments its performance decreases to negligible level due to increasing load and high neutron background. To sustain detector operation it will be replaced by the new system based on the scintillation strips read-out by silicon photomultipliers. The latter technology allows not only to reach time resolution at level of 1 ns but also perform the amplitude measurements. Nowadays the production of the new EKLM system's elements are under way. The assembly at KEK is started this fall.
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