Canadian Participation in the T2K Long Baseline Neutrino Experiment

加拿大参与 T2K 长基线中微子实验

• 批准号: SAPPJ-2017-00025
• 负责人: tanaka, hirohisa
• 金额: $ 3.98万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=666482
• 关键词: Canadian; Participation; T2K; Long; Baseline

This proposal supports the highly successful Canadian involvement in the T2K long baseline experiment, where an intense muon (anti)neutrino beam is produced at the J-PARC accelerator laboratory and directed 295 km away to the Super-Kamiokande detector to study their transition to other neutrino flavours arising from neutrino oscillations. Canadian members were founding members of the effort, introducing fundamental elements to the design of the experiment, and contributing key components such as the optical transition radiation detector, the fine-grained detectors and time projection chambers that form the core of the tracking system for the near detectors. With support from TRIUMF and ComputeCanada, Canadians provide other critical contributions such as the network, slow control, and databases for the near detector effort, large scale computing and data access, a new reconstruction framework for Super-Kamiokande, and beam line repair and maintenance. T2K has established strong track record of scientific achievements in the study of neutrinos including the discovery of the muon neutrino to electron neutrino appearance, the most precise measurements of the neutrino mixing angle theta23, and now the most sensitive probes of asymmetries in the neutrino vs. antineutrino oscillations which may provide clues on why the universe is matter-dominated. These scientific issues are among the most urgent facing particle physics today.***Several important developments have recently converged to define the future of the T2K program. First, continuous improvements in the accelerator performance have resulted in the beam power nearly doubling to 420 kW over the past few years. With the approval of a major upgrade to the accelerator to occur in 2018, beam power is projected to double again. With further improvements, beam power of 1 MW and beyond is now projected. This has led to the proposal for "T2K-II", an extension of the T2K program to approximately three times the currently approved exposure in advance of next generation experiments that are scheduled to start ~2025. The additional data and statistical precision require commensurate improvements in the systematic uncertainties, leading Canadian collaborators to propose the construction of NuPRISM, a novel near detector to address the most important systematic uncertainties. The beam and near detector upgrades necessary for T2K-II were given highest priority in the 2016 KEK Project Implementation Plan, leading to Stage 1 status for T2K-II and NuPRISM in summer 2016.***For FY2017-19, we propose to continue our commitments to essential parts of the experiment while starting construction of NuPRISM, for which a major request has been submitted to CFI.

这一提议支持加拿大非常成功地参与T2 K长基线实验，在J-PARC加速器实验室产生强烈的μ子（反）中微子束，并将其引向295公里外的超级神冈探测器，以研究它们向中微子振荡产生的其他中微子味的转变。加拿大成员是这项工作的创始成员，他们为实验设计引入了基本要素，并提供了关键部件，如光学跃迁辐射探测器、细粒度探测器和时间投影室，这些部件构成了近距离探测器跟踪系统的核心。在TRIUMF和ComputeCanada的支持下，加拿大人提供了其他重要贡献，如网络，慢速控制和近探测器工作的数据库，大规模计算和数据访问，超级神冈的新重建框架，以及光束线维修和维护。T2 K在中微子研究方面取得了很好的科学成就，包括发现了μ中微子到电子中微子的外观，最精确的中微子混合角θ 23的测量，以及现在最灵敏的中微子与反中微子振荡的不对称性探测器，这可能为宇宙为什么是物质主导提供线索。这些科学问题是当今粒子物理学面临的最紧迫的问题之一。最近，几项重要的发展汇聚在一起，定义了T2 K计划的未来。首先，加速器性能的不断改进导致束流功率在过去几年中几乎翻了一番，达到420千瓦。随着2018年加速器重大升级的批准，束流功率预计将再次翻倍。随着进一步的改进，现在预计束流功率将达到1兆瓦以上。这导致了“T2 K-II”的提议，即在计划于2025年开始的下一代实验之前，将T2 K计划扩展到目前批准的暴露量的约三倍。 额外的数据和统计精度需要在系统的不确定性相应的改进，导致加拿大合作者提出建设NuPRISM，一种新的近探测器，以解决最重要的系统的不确定性。在2016年KEK项目实施计划中，T2 K-II所需的束流和近探测器升级被列为最高优先级，导致T2 K-II和NuPRISM在2016年夏季进入第一阶段。对于2017 -19财年，我们建议继续致力于实验的重要部分，同时开始建设NuPRISM，为此已向CFI提交了一项重大申请。