MICE Ionization-Cooling Demonstration

MICE 电离冷却演示

• 批准号: ST/P001114/1
• 负责人: Kevin Ronald
• 金额: $ 47.6万
• 依托单位: University of Strathclyde
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FP001114%2F1
• 关键词: MICE; Ionization; Cooling; Demonstration

The Neutrino Factory is a possible future accelerator facility that creates beams of neutrinos from the decays of muons in a storage ring. The neutrino beams from a Neutrino Factory would have the highest intensity and can be controlled with unprecedented accuracy. For these reasons, the Neutrino Factory has the potential to discover measurable differences between neutrino and antineutrino oscillations, which could be the key to understanding the puzzle of the matter-antimatter asymmetry of the universe. This phenomenon, known as CP violation, has been observed in the quark sector but has never been seen in the neutrino sector. A future Neutrino Factory would determine CP violation in the neutrino sector with the best possible accuracy. Furthermore, a Neutrino factory could be used as a first stage before the construction of a Muon Collider, which could be used to measure the properties of the Higgs boson with the ultimate precision, and could potentially reach energies of up to 6 TeV, in order to explore new physics phenomena at the highest energy frontier.Both the Neutrino Factory and a Muon Collider rely on the acceleration of muons. To be able to create muon accelerator facilities, we require to reduce the size of the muon beam so that it may be accelerated. Since muons decay within 2 microseconds in their own rest frame, the only known way to reduce the phase space of the muon beam before the muons decay is to use the concept of ionisation cooling, in which the muons lose energy in an absorber such as liquid hydrogen or lithium hydride (LiH) and then recover the longitudinal component of the momentum by accelerating them using RF cavities. The international Muon Ionization Cooling Experiment (MICE) is an engineering demonstration of the concept of ionisation cooling. This experiment is being built at the Rutherford Appleton Laboratory, in which a beam of muons will be cooled in a muon cooling cell consisting of three absorbers and two RF cavities inside the field of two focus coil magnets. The emittance of the beam is measured before and after the cooling channel using a scintillating fibre tracker inside a superconducting solenoid, and the muons are identified using time-of-flight detectors, a Cherenkov detector and a calorimeter system consisting of a scintillating fibre-lead pre-shower detector (named the KL) and a totally active scintillating detector, called the Electron Muon Ranger (EMR). In this proposal we aim to perform measurements of emittance reduction, without RF cavities (MICE step IV) and perform the final demonstration of ionisation cooling with RF cavities. This proposal is a bid for 42 months funding from Oct 2016 to March 2020, supporting academic and student effort over that period and research staff from the end of the bridging support that ends in December 2016.

中微子工厂是未来可能的加速器设施，它利用存储环中μ子的衰变产生中微子束。来自中微子工厂的中微子束将具有最高的强度，并且可以以前所未有的精度进行控制。由于这些原因，中微子工厂有可能发现中微子和反中微子振荡之间可测量的差异，这可能是理解宇宙物质与反物质不对称性之谜的关键。这种被称为CP破坏的现象已在夸克区中观察到，但在中微子区中从未见过。未来的中微子工厂将以尽可能高的精度确定中微子区域的CP破坏。此外，中微子工厂可以用作建造μ子对撞机之前的第一级，它可以用于以终极精度测量希格斯玻色子的特性，并且有可能达到高达6TeV的能量，以便探索最高能量前沿的新物理现象。中微子工厂和μ子对撞机都依赖于μ子的加速。为了能够建造μ子加速器设施，我们需要减小μ子束的尺寸，以便可以加速它。由于 μ 子在其静止坐标系中会在 2 微秒内衰变，因此在 μ 子衰变之前减小 μ 子束相空间的唯一已知方法是使用电离冷却的概念，其中 μ 子在液氢或氢化锂 (LiH) 等吸收剂中损失能量，然后通过使用射频腔加速来恢复动量的纵向分量。国际μ介子电离冷却实验（MICE）是电离冷却概念的工程演示。该实验正在卢瑟福阿普尔顿实验室进行，其中一束 μ 介子将在 μ 介子冷却室中冷却，该介子冷却室由三个吸收器和两个聚焦线圈磁体磁场内的两个射频腔组成。使用超导螺线管内的闪烁光纤跟踪器测量冷却通道之前和之后的光束发射率，并使用飞行时间探测器、切伦科夫探测器和量热计系统来识别 μ 子，该系统由闪烁光纤引线预簇射探测器（称为 KL）和完全主动的闪烁探测器（称为电子 Mu 子游侠）组成 （电子病历）。在本提案中，我们的目标是在没有射频腔的情况下进行发射减少测量（MICE 步骤 IV），并使用射频腔进行电离冷却的最终演示。该提案寻求从 2016 年 10 月到 2020 年 3 月提供 42 个月的资金，支持该期间的学术和学生努力，以及从 2016 年 12 月结束的过渡支持结束后的研究人员。

项目成果

Analysis of Multiple Coulomb Scattering of Muons in the MICE Liquid H2 Absorber

MICE 液体 H2 吸收器中 μ 子的多重库仑散射分析

• 发表时间: 2021
• 作者: G.T. Chatzitheodoridis

First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment

Mu 子电离冷却实验中首次逐个粒子测量发射度

• DOI: 10.1140/epjc/s10052-019-6674-y
• 发表时间: 2019
• 期刊: The European Physical Journal C
• 作者: Adams D

Recent results from the study of emittance evolution in MICE

MICE 发射度演化研究的最新结果

• DOI: 10.18429/jacow-ipac2018-tupml067
• 发表时间: 2018
• 作者: Blackmore Victoria

Measurement of Phase Space Density Evolution in MICE

MICE 中相空间密度演化的测量

• DOI: 10.22323/1.295.0099
• 发表时间: 2018
• 作者: Drielsma F

The liquid-hydrogen absorber for MICE

• DOI: 10.1088/1748-0221/13/09/t09008
• 发表时间: 2018-07
• 期刊: Journal of Instrumentation
• 影响因子: 1.3
• 作者: V. Bayliss;J. Boehm;T. Bradshaw;M. Courthold;S. Harrison;M. Hills;P. Hodgson;S. Ishimoto;A. Kurup;W. Lau;K. Long;A. Nichols;D. Summers;M. Tucker;P. Warburton;S. Watson;C. Whyte