Emulsion sheet doublets as interface trackers for the OPERA experiment
Emulsion sheet doublets as interface trackers for the OPERA experiment
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DOI：
10.1088/1748-0221/3/07/p07005
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发表时间：
2008-07-01
影响因子：
1.3
通讯作者：
Zimmermannn, R.
中科院分区：
文献类型：
--
作者：
Anokhina, A.;Aoki, S.;Zimmermannn, R.
电子位置敏感探测器和基于核照相乳胶胶片的靶单元之间有效和明确互连的新方法已经开发出来。本文报道了该方法在OPERA实验中的应用，该实验旨在探测CNGS中微子束中的nu（mu）可逆矢nu（tau）振荡。为了减少由于安装在探测器之前收集的潜在径迹而产生的背景，对乳剂进行了现场大规模处理（“更新”）。可更换片材（CSd）包装，每个由一对乳胶膜制成，已被设计，组装和耦合到OPERA目标单元（“ECC砖”）。已建立了一个设备来打印X射线点，以便在CSd内以及CSd与相关ECC砖之间进行精确互连。样品乳剂电影已广泛扫描与国家的最先进的自动光学显微镜。有效的轨道匹配和强大的背景抑制已经实现了电子标记的穿透μ子的测试。通过匹配低能电子径迹的图案，进一步改善了二重态薄膜的取向。整个OPERA校准程序的调试正在进行中。
New methods for efficient and unambiguous interconnection between electronic position sensitive detectors and target units based on nuclear photographic emulsion films have been developed. The application to the OPERA experiment, that aims at detecting nu(mu) reversible arrow nu(tau) oscillations in the CNGS neutrino beam, is reported in this paper. In order to reduce background due to latent tracks collected before installation in the detector, on-site large-scale treatments of the emulsions ("refreshing") have been applied. Changeable Sheet (CSd) packages, each made of a doublet of emulsion films, have been designed, assembled and coupled to the OPERA target units ("ECC bricks"). A device has been built to print X-ray spots for accurate interconnection both within the CSd and between the CSd and the related ECC brick. Sample emulsion films have been extensively scanned with state-of-the-art automated optical microscopes. Efficient track-matching and powerful background rejection have been achieved in tests with electronically tagged penetrating muons. Further improvement of in-doublet film alignment was obtained by matching the pattern of low-energy electron tracks. The commissioning of the overall OPERA alignment procedure is in progress.