The construction technique of the high granularity and high transparency drift chamber of MEG II
The construction technique of the high granularity and high transparency drift chamber of MEG II
复制标题
MEG II高粒度、高透明度漂移室建造技术
DOI：
10.1088/1748-0221/12/07/c07022
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
G. Tassielli
中科院分区：
文献类型：
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作者：
G. Chiarello;C. Chiri;A. Corvaglia;F. Grancagnolo;A. Miccoli;M. Panareo;C. Pinto;M. Spedicato;G. Tassielli
MEG 实验寻找带电轻子风味违反衰变，μ +→ e+γ。 MEG已经确定了90% CL下支化比BR<4.2×10−13的世界最佳上限。整个探测器的升级已获批准，可大幅提高灵敏度。目前MEG正处于升级阶段，该阶段涉及所有探测器。新型正电子跟踪器是与束线同轴的单体积、全立体、小细胞漂移室 (DCH)。它由 10 个同心层组成，每个单个漂移单元的边长约为 7 mm 正方形，20 μm 镀金 W 传感线周围环绕着 40 μm 和 50 μm 镀银 Al 场线，比例为 5:1，约 12,000 根线。由于导线密度较高（12 根导线/cm2），使用经典的馈通技术作为导线锚固系统几乎无法实现，因此有必要开发新的布线策略。电线的数量以及对其位置精度和电线机械张力均匀性的严格要求迫使使用自动系统来操作接线程序。该接线机器人由 INFN Lecce 和萨伦托大学实验室设计和制造，包括： ⋅ 一台半自动接线机，具有高精度的导线机械张力（优于 0.5 g）和导线定位（20 μm），用于多线层的同时布线； ⋅ 非接触式红外激光焊接工具； ⋅ 用于存储和运输多线层的自动处理系统。漂移室目前正在 INFN 建造中，预计将于 2017 年夏末完工，然后交付 PSI 进行调试。
The MEG experiment searches for the charged lepton flavor violating decay, μ +→ e+γ. MEG has already determined the world best upper limit on the branching ratio BR<4.2× 10−13 at 90% CL. An upgrade of the whole detector has been approved to obtain a substantial increase in sensitivity. Currently MEG is in upgrade phases, this phase involves all the detectors. The new positron tracker is a single volume, full stereo, small cells drift chamber (DCH) co-axial to the beam line. It is composed of 10 concentric layers and each single drift cell is approximately square 7 mm side, with a 20 μ m gold plated W sense wire surrounded by 40 μ m and 50 μ m silver plated Al field wires in a ratio of 5:1, about 12,000 wires. Due to the high wire density (12 wires/cm2), the use of the classical feed-through technique as wire anchoring system could hardly be implemented and therefore it was necessary to develop new wiring strategies. The number of wires and the stringent requirements on the precision of their position and on the uniformity of the wire mechanical tension impose the use of an automatic system to operate the wiring procedures. This wiring robot, designed and built at the INFN Lecce and University of Salento laboratories, consists of: ⋅ a semiautomatic wiring machine with a high precision on wire mechanical tensioning (better than 0.5 g) and on wire positioning (20 μ m) for simultaneous wiring of multiwire layers; ⋅ a contact-less infrared laser soldering tool; ⋅ an automatic handling system for storing and transporting the multi-wire layers. The drift chamber is currently under construction at INFN and should be completed by the end of summer 2017 to be then delivered to PSI for commissioning.
MEG II 液氙探测器和模拟
DOI：
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发表时间：
2022
期刊：
影响因子：
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作者：
Kensuke Yamamoto;Sei Ban;Kei Ieki;Atsuhiko Och;Rina Onda;Wataru Ootani;Atsushi Oya;Masato Takahashi;潘 晟;Sei Ban;Sei Ban
通讯作者：
Sei Ban