论文标题
MEG II实验的新漂移室
The new drift chamber of the MEG II experiment
论文作者
论文摘要
本文介绍了MEG II圆柱漂移室（CDCH），这是MEG 2阶段的关键探测器，旨在达到$ 6 \ times 10^{ - 14} $的敏感性水平，用于带电的Lepton风味，违反了$μ^+ \ rightArrow \ rightArrow \ rightArrow \ rightArrow \ rightArrow \ mbox {e}^e}^+γ+γ+ decay。 CDCH旨在克服MEG $ \ mbox {E}^+$跟踪器的局限性，并保证以高速率的高速运行，并具有长期的检测器稳定性。 CDCH是一种低质量的体积检测器，具有高粒度：9层的192个漂移电池，几乎没有毫米宽，由$ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \多，约为12000美元，以立体声构造，用于纵向命中。总辐射长度为$ 1.5 \ times 10^{ - 3} $ $ \ mbox {x} _0 $，从而最大程度地减少了多个库仑散射（MCS）贡献，并允许单击110 $μ$ m的单击分辨率和130 kev/c的动量分辨率。 CDCH集成到MEG II实验设备中将在今年开始。
This article presents the MEG II Cylindrical Drift CHamber (CDCH), a key detector for the phase 2 of MEG, which aims at reaching a sensitivity level of the order of $6 \times 10^{-14}$ for the charged Lepton Flavour Violating $μ^+ \rightarrow \mbox{e}^+ γ$ decay. CDCH is designed to overcome the limitations of the MEG $\mbox{e}^+$ tracker and guarantee the proper operation at high rates with long-term detector stability. CDCH is a low-mass unique volume detector with high granularity: 9 layers of 192 drift cells, few mm wide, defined by $\approx 12000$ wires in a stereo configuration for longitudinal hit localization. The total radiation length is $1.5 \times 10^{-3}$ $\mbox{X}_0$, thus minimizing the Multiple Coulomb Scattering (MCS) contribution and allowing for a single-hit resolution of 110 $μ$m and a momentum resolution of 130 keV/c. CDCH integration into the MEG II experimental apparatus will start in this year.
