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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=688095
• 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. **

CERN 大型强子对撞机 (LHC) 的 MoEDAL 实验于 2015 年 LHC Run2 开始时开始采集数据。 MoEDAL 是一项开创性的实验，旨在寻找新物理学的高度电离化身，例如磁单极子、多重带电粒子或大量（伪）稳定带电粒子。 MoEDAL 的物理项目定义了超过 34 种场景，这些场景可能会对基本问题产生潜在的革命性见解，包括：额外的维度或新的对称性；磁荷；还有，暗物质的性质。 MoEDAL 合作组织由阿尔伯塔大学 (UofA) 领导，由来自全球 26 个研究所的 70 名物理学家组成。该实验的发现潜力以互补的方式扩展了大型强子对撞机的物理视野。迄今为止，MoEDAL 已经对多重磁力单极子和高带电粒子（正在准备中）的存在建立了世界上最好的限制。去年，MoEDAL 向 LHC 委员会 (LHCC) 提交了一份意向通知 (NoI)，要求在 2020 年开始的 LHC Run3 期间提供额外的 30 fb-1 数据。MoEDAL 的 NoI 受到好评，为全面的今年要求。此外，MAPP（MoEDAL 穿透粒子装置）是一种新的 MoEDAL 子探测器，计划部署在 Run3 中，它将扩展 MoEDAL 的物理范围，允许搜索毫带电粒子和新的超长寿命中性粒子。*** ***MoEDAL 探测器具有双重性质。首先，它就像一个巨大的相机，由核径迹探测器（NTD）组成，通过超快扫描光学显微镜进行离线分析。 NTD 在各种设施中使用重离子进行校准。其次，它具有独特的能力来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 IP8 的 MoEDAL 洞穴中的约 8 个设备组成。 TMPX 用于监控光束相关背景。 MoEDAL NTD 和 MMT 阵列是无源的，不需要读出电子设备或触发器。实时 TimePix 系统通过网络读出。虽然实验没有要求持续有人值守，但 MoEDAL 探测器的敏感元件需要每年更换一次。 NTD 探测器被送往 INFN 博洛尼亚和赫尔辛基大学进行分析。暴露的 MMT 捕获体积被发送到苏黎世联邦理工学院 SQUID 设施，以扫描是否存在捕获的单极子。 **