The MoEDAL Apparatus for Penetrating Particles (MAPP) at the LHC - Part (2)

LHC 的 MoEDAL 粒子穿透装置 (MAPP) - 第 (2) 部分

• 批准号: SAPEQ-2022-00005
• 负责人: Pinfold, James
• 金额: $ 2.77万
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762550
• 关键词: MoEDAL; Apparatus; Penetrating; Particles; MAPP

The MoEDAL (Monopole and Exotics Detector at the LHC) is the 1st  "dedicated search experiment" to be deployed at  the LHC. It is designed to search for the highly ionizing  particle (HIP) 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 international collaboration of 70 physicists. It is partially supported by an NSERC Discovery grant. MoEDAL started to take data in 2015 and has since then established the world's most stringent limits on:  multiply charged magnetic monopole production. It is also the first experiment to place limits on:  the direct production of spin1 monopoles; dyons, particles with electric and magnetic charge; and,  monopoles produced  in heavy-ion collisions via the Schwinger mechanism.  MoEDAL was also the first experiment to  place limits on monopole production via photon fusion at the LHC. MoEDAL papers reporting the world's best experimental limits  on massive electrically charged HIPs, are in the process of being submitted. MoEDAL will be reinstalled to take data at LHC's Run-3 starting in 2022 with the addition of a new sub-detector called MAPP (MoEDAL Apparatus for Penetrating Particles). MAPP's purpose is to expand MoEDAL's  physics reach to include the search for Feebly Interacting Particles, such as  mini-charged particles (mCP) with charge as low as 0.001e, where e is the electron charge. The funding for the construction of the MAPP-mcP detector was largely provided by a Category-2 RTI grant awarded in 2020.  MAPP-mCP consists of 4 collinear sections with cross-sectional area 1 sqm. Each section is comprised of 100 (10cm x 10cm x 75cm) scintillator bars readout by a fast, low noise PMT and specialized fast electronics. Thus, each through going particle will encounter 3m 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 30 m of intervening rock; and, an active veto system. The MAPP-mCP detector will greatly extend the LHC's sensitivity to fractional charge which currently lies at only ~1/3e. This request has two parts. The 1st  part is for additional funding to finish the MAPP-mCP detector. This is required because our  Chinese PMT supplier (HZK) ceased trading in 2021  before all 400 PMTs were delivered, due to financial problems arising from the   Covid-19 pandemic. As a result we have to purchase the last 100 PMTs from Hamamatsu as a much higher price. We are asking for the difference is the cost between 100 HZK PMTs, already funded,  and 100 equivalent  Hamamatsu PMTs. The 2nd part of the request,  is for  an outrigger scintillator detector to improve the MAPP-mQP's acceptance for higher mass milli-charged particles. Here the funds are needed to provide additional scintillator material to add to a contribution of scintillator from the EXO-200 collaboration, in order to complete the detector.

MoEDAL（大型强子对撞机的单极子和奇异探测器）是大型强子对撞机上部署的第一个“专用搜索实验”，它旨在以与主要项目互补的方式搜索新物理的高电离粒子（HIP）化身。 LHC 探测器、ATLAS 和 CMS 由 MoEDAL-Alberta 小组领导，由 70 个国际组织合作开展。它得到了 NSERC Discovery 拨款的部分支持，自 2015 年起就对以下方面制定了世界上最严格的限制：​这也是第一个对以下方面进行限制的实验。直接产生自旋单极子；带电荷和磁电荷的粒子；以及通过施温格机制在重离子碰撞中产生的单极子。 MoEDAL 正在提交对大型强子对撞机 (LHC) 中通过光子聚变产生的单极子进行限制的论文，该论文报告了世界上对大规模带电 HIP 的最佳实验限制，将于 2022 年开始在大型强子对撞机 (LHC) 的 Run-3 上重新安装以获取数据。添加名为 MAPP（MoEDAL 穿透粒子装置）的新子探测器的目的是扩大 MoEDAL 的物理范围。包括对弱相互作用粒子的搜索，例如电荷低至 0.001e 的微型带电粒子 (mCP)，其中 e 是电子电荷 建造 MAPP-mcP 探测器的资金主要由类别提供。 -2 2020 年授予 RTI 拨款。MAPP-mCP 由 4 个共线部分组成，横截面积为 1 平方米，每个部分由 100 平方米组成。 (10cm x 10cm x 75cm) 闪烁体棒通过快速、低噪声 PMT 和专用快速电子设备进行读数，因此，每个穿过的粒子都会遇到 3m 的闪烁体，同时由 4 个 PMT 进行读数，从而免受宇宙射线和 SM 粒子的影响。从IP8开始，由：100m岩石覆盖层；至少30m的干预岩石；以及，主动否决系统。 MAPP-mCP 探测器将极大地提高 LHC 对分数电荷的灵敏度，目前该灵敏度仅为约 1/3e。此请求分为两个部分：第一部分是用于完成 MAPP-mCP 探测器的额外资金。这是必需的，因为我们的中国人。由于 Covid-19 大流行引发的财务问题，PMT 供应商 (HZK) 于 2021 年在交付所有 400 个 PMT 之前停止了交易，因此我们不得不购买最后一个。 Hamamatsu 的 100 个 PMT 价格要高得多。我们要求的差异是已资助的 100 个 HZK PMT 和 100 个同等的 Hamamatsu PMT 之间的成本。请求的第二部分是用于改进 MAPP 的支腿闪烁体探测器。 -mQP 接受更高质量的毫带电粒子 这里需要资金来提供额外的闪烁体材料以增加贡献。来自 EXO-200 合作的闪烁体，以完成探测器。