The MAPP (MoEDAL Apparatus for Penetrating Particles) Upgrade for the MoEDAL-LHC Experiment at RUN-3

RUN-3 的 MoEDAL-LHC 实验的 MAPP（MoEDAL 粒子穿透装置）升级

• 批准号: SAPEQ-2020-00001
• 负责人: Pinfold, James
• 金额: $ 22.34万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Research Tools and Instruments
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718756
• 关键词: MAPP; MoEDAL; Apparatus; Penetrating; Particles

The MoEDAL (Monopole and Exotics Detector at the LHC) is the 1st of a series of "dedicated experiments" planned for the LHC and designed to search for the highly ionizing avatars of new physics in a complementary way to the main LHC detectors, ATLAS and CMS. The MoEDAL experiment, led by the MoEDAL-Alberta group, is carried out by a collaboration of 70 physicists from around the world. It is partially supported by an NSERC Discovery grant. MoEDAL started to take data in 2015 and has since then has established the world's most stringent limits on multiply charged magnetic monopole production. MoEDAL was also the world's 1st experiment to put limits on the direct production of spin-1 monopoles and the first LHC experiment to place limits on monopole production via photon fusion as well as the Drell-Yan (DY) process. MoEDAL papers reporting the world's best direct limits on Dyons, highly charged monopoles, and, on multiply electrically charged particles, are in the process of being submitted. The largely passive MoEDAL detector, deployed at Point 8 on the LHC ring, has a dual nature. First, it acts like a giant camera, comprised of nuclear track detectors - analyzed offline by ultra fast scanning microscopes - sensitive only to new physics. Second, it is uniquely able to trap the particle messengers of physics beyond the Standard Model (SM) for further study. The radiation environment is monitored by a real-time TimePix pixel detector array. In order to push to higher energy (14 TeV) and luminosity (30 fb-1) the MoEDAL Collaboration will be taking data at LHC's RUN-3 (2021-2023). As part of this program the MoEDAL detector will be updated with the addition of a new subdetector called MAPP (MoEDAL Apparatus for Penetrating Particles). MAPP's purpose is to expand the physics reach of MoEDAL to include the search for: mini-charged particles (mCP) with charges as low as 0.001 the electron charge (e). and, weakly interacting very long-lived neutral particle messengers of new physics. Only the dedicated experiments, MOEDAL-MAPP and FASER, with complementary physics programs, will take data during LHC's upcoming RUN-3. The MoEDAL-Alberta group has the responsibility to design MAPP and also to construct the central MAPP mCP subdetector (MAPP-mCP). MAPP-mCP consists of two collinear sections with cross-sectional area 1.0 m2. Each section is comprised of 100 (10cm x 10cm) lengths comprised of 2 x 75 cm scintillator bars. Each bar is readout by a fast, low noise PMT that readout by specialized fast electronics, with a ToF resolution of 500 ps. Thus, each though-going particle will encounter 3m (4 bars) of scintillator, readout by 4 PMTs in coincidence. MAPP is protected from cosmic rays and SM particles from IP8, by: 100m rock overburden; at least 25 m of intervening rock; and, an active veto system. The MAPP mCP detector will greatly extend the ATLAS and CMS sensitivity to fractional charge which currently lies at only ~1/3e.

MoEDAL（大型强子对撞机单极子和奇异探测器）是为大型强子对撞机计划的一系列“专用实验”中的第一个，旨在以与主要大型强子对撞机探测器 ATLAS 和 CMS 互补的方式寻找新物理学的高电离化身。 MoEDAL 实验由 MoEDAL-Alberta 小组领导，由来自世界各地的 70 名物理学家合作进行。它得到了 NSERC Discovery 拨款的部分支持。 MoEDAL 于 2015 年开始收集数据，此后对多电荷磁单极子的生产制定了世界上最严格的限制。 MoEDAL 也是世界上第一个限制 spin-1 单极子直接生产的实验，也是第一个限制通过光子聚变和 Drell-Yan (DY) 过程生产单极子的大型强子对撞机实验。 MoEDAL 的论文正在提交，该论文报告了世界上对 Dyons、高电荷单极子和多带电粒子的最佳直接限制。 部署在大型强子对撞机环上的第 8 点的主要无源 MoEDAL 探测器具有双重性质。首先，它的作用就像一个巨大的相机，由核径迹探测器组成——通过超快扫描显微镜进行离线分析——只对新物理敏感。 其次，它具有独特的能力，能够捕获标准模型（SM）之外的物理粒子信使以供进一步研究。辐射环境由实时 TimePix 像素探测器阵列监控。为了推动更高的能量 (14 TeV) 和光度 (30 fb-1)，MoEDAL 合作组织将在 LHC 的 RUN-3（2021-2023 年）上获取数据。作为该计划的一部分，MoEDAL 探测器将进行更新，添加一个名为 MAPP（MoEDAL 穿透粒子装置）的新子探测器。 MAPP 的目的是扩大 MoEDAL 的物理范围，包括搜索： 电荷低至 0.001 的微型带电粒子 (mCP) 电子电荷 (e)。 并且，弱相互作用的非常长寿的新物理学的中性粒子信使。 只有具有互补物理程序的专用实验 MOEDAL-MAPP 和 FASER 才会在 LHC 即将进行的 RUN-3 期间获取数据。 MoEDAL-Alberta 小组负责设计 MAPP 并构建中央 MAPP mCP 子探测器 (MAPP-mCP)。 MAPP-mCP 由两个共线部分组成，横截面积为 1.0 m2。每个部分由 100 (10 厘米 x 10 厘米) 长度组成，由 2 x 75 厘米闪烁体条组成。每个条形图均由快速、低噪声 PMT 读出，而 PMT 则由专门的快速电子器件读出，ToF 分辨率为 500 ps。因此，每个穿过的粒子将遇到 3m（4 条）的闪烁体，同时由 4 个 PMT 读出。 MAPP 通过以下措施免受宇宙射线和 SM 颗粒的影响（IP8）： 100m 岩石覆盖层； 至少 25 m 的中间岩石；以及主动否决制度。 MAPP mCP 探测器将极大地扩展 ATLAS 和 CMS 对分数电荷的灵敏度，而目前分数电荷的灵敏度仅为约 1/3e。