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

MoEDAL（大型强子对撞机的单极子和外来物探测器）是部署在大型强子对撞机上的第一个“专用搜索实验”。它旨在以一种与大型强子对撞机主要探测器ATLAS和CMS互补的方式，寻找新物理的高电离粒子（HIP）。MoEDAL实验由MoEDAL- alberta小组领导，由70名物理学家进行国际合作。它部分由NSERC发现基金支持。MoEDAL于2015年开始采集数据，并从那时起建立了世界上最严格的多重带电磁单极子生产限制。这也是第一个限制自旋单极子的直接产生的实验；Dyons，带电和磁荷的粒子；以及在重离子碰撞中通过Schwinger机制产生的单极子。MoEDAL也是第一个限制在大型强子对撞机中通过光子聚变产生单极子的实验。报告世界上最大的大规模带电HIPs实验极限的MoEDAL论文正在提交过程中。从2022年开始，将重新安装MoEDAL，在LHC的Run-3上采集数据，并增加一个名为MAPP （MoEDAL穿透粒子装置）的新子探测器。MAPP的目的是扩展MoEDAL的物理范围，包括寻找弱相互作用粒子，比如电荷低至0.001e的微型带电粒子（mCP），其中e是电子的电荷。MAPP-mcP探测器的建设资金主要由2020年授予的2类RTI拨款提供。MAPP-mCP由4个共线截面组成，横截面积为1平方米。每个部分由100个（10cm x 10cm x 75cm）闪烁条组成，由快速、低噪音的PMT和专门的快速电子设备读出。因此，每个穿过粒子将遇到3米的闪烁体，由4个pmt巧合地读出。MAPP被保护免受宇宙射线和SM粒子的IP8，通过：100米的岩石覆盖层；至少30米的中间岩石；还有一个积极的否决制度。MAPP-mCP探测器将大大提高LHC对分数电荷的灵敏度，目前LHC对分数电荷的灵敏度仅为~1/3e。这个请求有两个部分。第一部分是额外的资金，以完成MAPP-mCP探测器。这是必要的，因为我们的中国PMT供应商（HZK）在所有400辆PMT交付之前，由于2019冠状病毒大流行引起的财务问题，于2021年停止了交易。因此，我们不得不以更高的价格从滨松购买最后100台pmt。我们要求的差额是已获得资助的100个HZK PMTs和100个等效滨松PMTs之间的费用。请求的第二部分是一个伸出式闪烁体探测器，以提高MAPP-mQP对高质量毫荷粒子的接受度。这里需要资金来提供额外的闪烁体材料，以增加EXO-200合作的闪烁体贡献，以完成探测器。

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.