The MoEDAL Experiment at the Large Hadron Collider

大型强子对撞机的 MoEDAL 实验

• 批准号: SAPPJ-2019-00040
• 负责人: Pinfold, James
• 金额: $ 2.91万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=739453
• 关键词: MoEDAL; Experiment; Large; Hadron; Collider

The MoEDAL experiment at CERN's Large Hadron Collider (LHC) started data taking in 2015, at the start of LHC's Run2. MoEDAL is a pioneering experiment designed to search for highly ionizing avatars of new physics such as magnetic monopoles, multiply electrically charged particles, or massive (pseudo) stable charged particles. MoEDAL's physics program defines over 34 scenarios that may yield potentially revolutionary insights into foundational questions, involving: extra dimensions or new symmetries; magnetic charge; and, the nature of dark matter.  The MoEDAL Collaboration, led by the University of Alberta (UofA), consists of 70 physicists from 26 institutes around the world. The experiment's discovery potential expands the LHC's physics horizons, in a complementary way. To date, MoEDAL has established the world's best limits on the existence of multiply magnetically charged monopoles and highly electrically charged particles (in prep). Last year, MoEDAL presented a Notice of Intent (NoI) to the LHC Committee (LHCC), to request an additional 30 fb-1 of data during LHC's Run3, starting in 2020. MoEDAL's NoI was  well received, leading the way for the full request this year. In addition, MAPP (MoEDAL Apparatus for Penetrating Particles), a new MoEDAL sub-detector, planned for deployment for Run3,  will extend MoEDAL's physics reach allowing the search for milli-charged particles and new very long-lived neutral particles. The MoEDAL detector has a dual nature. First, it acts like a giant camera, comprised of Nuclear Track Detectors (NTDs) analyzed offline by ultra fast scanning optical microscope. The NTDs are calibrated using heavy-ion at various facilities. Second, it is uniquely able to trap the particle messengers of new physics for further study. The third sub-detector system is a TimePix pixel device array (TMPX), consisting of ~8 devices distributed throughout the MoEDAL cavern at IP8. TMPX is used to monitor beam related backgrounds. The MoEDAL NTD and MMT arrays are passive requiring no readout electronics or trigger. The real time TimePix system is readout over the web. Although  there are no requirements for the experiment to be constantly manned the sensitive elements of the MoEDAL detector need to be replaced once a year. The NTD detectors are sent for analysis at INFN Bologna and the University of Helsinki. The exposed MMT trapping volumes are sent to the ETH Zurich SQUID Facility to be scanned for the presence of trapped monopoles.

欧洲核子研究中心大型强子对撞机（LHC）的MoEDAL实验于2015年开始采集数据，当时LHC运行2开始。MoEDAL是一个开创性的实验，旨在寻找新物理学的高度电离化身，如磁单极子，多重带电粒子或大质量（伪）稳定带电粒子。MoEDAL的物理计划定义了超过34种可能产生潜在革命性见解的基础问题，涉及：额外维度或新对称性;磁荷;以及暗物质的性质。 由阿尔伯塔大学（UofA）领导的MoEDAL合作组织由来自世界各地26个研究所的70名物理学家组成。该实验的发现潜力以一种互补的方式扩展了LHC的物理学视野。到目前为止，MoEDAL已经建立了世界上最好的限制存在的多重磁荷单极子和高度带电粒子（准备）。去年，MoEDAL向LHC委员会（LHCC）提交了一份意向通知（NoI），要求从2020年开始在LHC运行3期间增加30 fb-1的数据。MoEDAL的NoI受到了好评，为今年的全面申请铺平了道路。此外，MAPP（MoEDAL穿透粒子装置），一个新的MoEDAL子探测器，计划部署运行3，将扩大MoEDAL的物理范围，允许搜索毫带电粒子和新的非常长寿命的中性粒子。MoEDAL探测器具有双重性质。首先，它就像一个巨大的相机，由超快速扫描光学显微镜离线分析的核径迹探测器（NTD）组成。NTD在不同的设施中使用重离子进行校准。第二，它独特地能够捕获新物理学的粒子信使以供进一步研究。第三个子探测器系统是TimePix像素设备阵列（TMPX），由分布在IP 8 MoEDAL洞穴中的约8个设备组成。TMPX用于监测光束相关背景。MoEDAL NTD和MMT阵列是无源的，不需要读出电子器件或触发器。真实的时间TimePix系统通过网络读出。虽然实验不需要经常有人值守，但能源和发展部探测器的敏感元件每年需要更换一次。NTD探测器被送往INFN博洛尼亚和赫尔辛基大学进行分析。将暴露的MMT捕获体积发送到ETH苏黎世SQUID设施以扫描捕获单极子的存在。