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arXiv 1406.4564physics.ins-dethep-exnucl-ex
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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辐射器

Silica aerogel radiator for use in the A-RICH system utilized in the Belle II experiment

Makoto Tabata, Ichiro Adachi, Nao Hamada, Koji Hara, Toru Iijima, Shuichi Iwata, Hidekazu Kakuno, Hideyuki Kawai, Samo Korpar, Peter Križan, Tetsuro Kumita, Sho… 展开作者

Makoto Tabata, Ichiro Adachi, Nao Hamada, Koji Hara, Toru Iijima, Shuichi Iwata, Hidekazu Kakuno, Hideyuki Kawai, Samo Korpar, Peter Križan, Tetsuro Kumita, Shohei Nishida, Satoru Ogawa, Rok Pestotnik, Luka Šantelj, Andrej Seljak, Takayuki Sumiyoshi, Elvedin Tahirović, Keisuke Yoshida, Yosuke Yusa

摘要:

本文介绍了大面积疏水性二氧化硅气凝胶的开发和批量生产的最新进展,该气凝胶用作基于气凝胶的环形成像切伦科夫(A-RICH)计数器的辐射器,该计数器将安装在Belle II探测器的前端盖中。近场聚焦A-RICH系统是专门为识别带电K介子和π介子而设计的。安装的气凝胶切伦科夫辐射器的折射率约为1.05,我们的目标是在高达4 GeV/ $c$的动量超过4 $σ$的分离能力。大面积气凝胶砖(大于18 $\times $ 18 $\times $ 2 cm $^3$)首先在测试生产中通过除常规方法之外的销干燥来制造。我们建议用124种不同折射率(1.045和1.055)的水射流修整的扇形双层聚焦气凝胶组合填充大的端盖区域(面积3.5 m $^2$)。根据试生产结果,我们决定通过常规方法制造气凝胶,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4 $σ$。

英文摘要:

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 4$σ$ at momenta up to 4 GeV/$c$. Large-area aerogel tiles (over 18 $\times $ 18 $\times $ 2 cm$^3$) 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 m$^2$) 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 the $K$/$π$ separation capability of a prototype A-RICH counter exceeded 4$σ$ at 4 GeV/$c$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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