Silica aerogel radiator for use in the A-RICH system utilized in the Belle II experiment
Silica aerogel radiator for use in the A-RICH system utilized in the Belle II experiment
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用于 Belle II 实验中使用的 A-RICH 系统的二氧化硅气凝胶散热器
DOI：
10.1016/j.nima.2014.04.030
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Sagamihara & Chiba U.), et al.
中科院分区：
文献类型：
--
作者：
Makoto Tabata (JAXA;Sagamihara & Chiba U.), et al.
本文介绍了大面积疏水二氧化硅气凝胶的开发和大规模生产的最新进展，用于气凝胶环成像切伦科夫（A-RICH）计数器的散热器，该计数器将安装在Belle II探测器的前端帽上。近聚焦A-RICH系统是专门为识别带电介子和介子而设计的。所安装的气凝胶切伦科夫散热器的折射率约为1.05，我们的目标是在高达4 GeV/c的动量下，分离能力超过4σ。大面积气凝胶瓦（超过18×18×2 cm3）首先在测试产品中通过针干燥除常规方法外制造。我们提出用124种不同折射率（1.045和1.055）的水射流修整扇形双层聚焦气凝胶组合填充大端盖区域（面积3.5 m2）。在测试生产结果的指导下，我们决定采用常规方法生产气凝胶，目前正在进行批量生产。在DESY进行的电子束测试中，我们证实了原型a - rich计数器在4 GeV/c下的k /π分离能力超过了4σ。
This paper presents recent progress in the development and mass production of large-area hydrophobic silica aerogels for use as radiators in the aerogel-based ring-imaging Cherenkov (A-RICH) counter, which will be installed in the forward end cap of the Belle II detector. The proximity-focusing A-RICH system is especially designed to identify charged kaons and pions. The refractive index of the installed aerogel Cherenkov radiators is approximately 1.05, and we aim for a separation capability exceeding 4σat momenta up to 4 GeV/c. Large-area aerogel tiles (over 18×18×2 cm3) were first fabricated in test productions by pin drying in addition to conventional methods. We proposed to fill the large end-cap region (area 3.5 m2) with 124 water-jet-trimmed fan-shaped dual-layer-focusing aerogel combinations of different refractive indices (1.045 and 1.055). Guided by the test production results, we decided to manufacture aerogels by the conventional method and are currently proceeding with mass production. In an electron beam test undertaken at the DESY, we confirmed that theK/πseparation capability of a prototype A-RICH counter exceeded 4σat 4 GeV/c.