Continuation of UK participation in the International Muon Ionization Cooling Experiment - Bridging Funds

英国继续参与国际介子电离冷却实验 - 过渡基金

• 批准号: ST/N003330/1
• 负责人: Paul Kyberd
• 金额: $ 8.25万
• 依托单位: Brunel University London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FN003330%2F1
• 关键词: Continuation; UK; participation; International; Muon

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 GeV, 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 9 months funding from April to December 2016 in order to bridge the current MICE Step IV construction grant that ends in March 2016 and the final demonstration of ionisation cooling, expected to run until 2019.

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 Mu 子对撞机之前的第一阶段，该对撞机可用于以终极精度测量希格斯玻色子的特性，并有可能达到高达 6 GeV 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 子在其自身的静止坐标系中会在 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 子在吸收器（例如液体）中损失能量氢或氢化锂 (LiH)，然后通过使用射频腔加速它们来恢复动量的纵向分量。国际μ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、切伦科夫探测器和由闪烁光纤引线组成的量热计系统来识别 μ 子预簇射探测器（名为 KL）和完全主动的闪烁探测器，称为电子介子游侠（EMR）。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。该提案竞标从 2016 年 4 月到 12 月提供 9 个月的资金，以弥补目前于 2016 年 3 月结束的 MICE 第四步建设拨款和预计将持续到 2019 年的电离冷却的最终示范。

项目成果

Pion contamination in the MICE muon beam

• DOI: 10.1088/1748-0221/11/03/p03001
• 发表时间: 2015-11
• 期刊: Journal of Instrumentation
• 影响因子: 1.3
• 作者: D. Adams;A. Alekou;M. Apollonio;R. Asfandiyarov;G. Barber;P. Barclay;A. Bari;R. Bayes;V. Bayliss;R. Bertoni;V. Blackmore;A. Blondel;S. Blot;M. Bogomilov;M. Bonesini;C. Booth;D. Bowring;S. Boyd;T. W. Brashaw;U. Bravar;A. Bross;M. Capponi;T. Carlisle;G. Cecchet;C. Charnley;F. Chignoli;D. Cline;J. Cobb;G. Colling;N. Collomb;L. Coney;P. Cooke;M. Courthold;L. Cremaldi;A. Demello;A. Dick;A. Dobbs;P. Dornan;M. Drews;F. Drielsma;F. Filthaut;T. Fitzpatrick;P. Franchini;V. Francis;L. Fry;A. Gallagher;R. Gamet;R. Gardener;S. Gourlay;Alec Grant;J. R. Greis;S. Griffiths;P. Hanlet;O. M. Hansen;G. Hanson;T. L. Hart;T. Hartnett;T. Hayler;C. Heidt;M. Hills;P. Hodgson;C. Hunt;A. Iaciofano;S. Ishimoto;G. Kafka;D. Kaplan;Y. Karadzhov;Y. K. Kim;Y. Kuno;P. Kyberd;J. Lagrange;J. Langlands;W. Lau;M. Leonova;Derun Li;A. Lintern;M. Littlefield;K. Long;T. Luo;C. Macwaters;B. Martlew;J. Martyniak;R. Mazza;S. Middleton;A. Moretti;A. Moss;A. Muir;I. Mullacrane;J. Nebrensky;D. Neuffer;A. Nichols;R. Nicholson;J. Nugent;A. Oates;Y. Onel;D. Orestano;E. Overton;P. Owens;V. Palladino;J. Pasternak;F. Pastore;C. Pidcott;M. Popovic;R. Preece;S. Prestemon;D. Rajaram;S. Ramberger;M. Rayner;S. Ricciardi;T. Roberts;M. Robinson;C. Rogers;K. Ronald;P. Rubinov;P. Rucinski;H. Sakamato;D. Sanders;E. Santos;T. Savidge;P. Smith;P. Snopok;F. Soler;D. Speirs;T. Stanley;G. Stokes;D. Summers;J. Tarrant;I. Taylor;L. Tortora;Y. Torun;R. Tsenov;C. D. Tunnell;M. Uchida;G. Vankova-Kirilova;S. Virostek;M. Vretenar;P. Warburton;S. Watson;C. White;C. Whyte;A. Wilson;M. Winter;X. Yang;A. Young;M. Zisman

The reconstruction software for the MICE scintillating fibre trackers

• DOI: 10.1088/1748-0221/11/12/t12001
• 发表时间: 2016-10
• 期刊: Journal of Instrumentation
• 影响因子: 1.3
• 作者: A. Dobbs;C. Hunt;K. Long;E. Santos;M. Uchida;P. Kyberd;C. Heidt;S. Blot;E. Overton

Lattice design and expected performance of the Muon Ionization Cooling Experiment demonstration of ionization cooling

μ子电离冷却的晶格设计和预期性能 电离冷却实验演示

• DOI: 10.1103/physrevaccelbeams.20.063501
• 发表时间: 2017
• 期刊: Physical Review Accelerators and Beams
• 影响因子: 1.7
• 作者: Bogomilov M