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Demonstration of cooling by the muon ionization cooling experiment

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Bogomilov, M. and Boyd, Steve B. (2020) Demonstration of cooling by the muon ionization cooling experiment. Nature, 578 (7793). pp. 53-59. doi:10.1038/s41586-020-1958-9

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Official URL: http://dx.doi.org/10.1038/s41586-020-1958-9

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Abstract

The use of accelerated beams of electrons, protons or ions has furthered the development of nearly every scientific discipline. However, high-energy muon beams of equivalent quality have not yet been delivered. Muon beams can be created through the decay of pions produced by the interaction of a proton beam with a target. Such ‘tertiary’ beams have much lower brightness than those created by accelerating electrons, protons or ions. High-brightness muon beams comparable to those produced by state-of-the-art electron, proton and ion accelerators could facilitate the study of lepton–antilepton collisions at extremely high energies and provide well characterized neutrino beams1,2,3,4,5,6. Such muon beams could be realized using ionization cooling, which has been proposed to increase muon-beam brightness7,8. Here we report the realization of ionization cooling, which was confirmed by the observation of an increased number of low-amplitude muons after passage of the muon beam through an absorber, as well as an increase in the corresponding phase-space density. The simulated performance of the ionization cooling system is consistent with the measured data, validating designs of the ionization cooling channel in which the cooling process is repeated to produce a substantial cooling effect9,10,11. The results presented here are an important step towards achieving the muon-beam quality required to search for phenomena at energy scales beyond the reach of the Large Hadron Collider at a facility of equivalent or reduced footprint

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Muons , Particle accelerators , Ionization
Journal or Publication Title: Nature
Publisher: Nature Publishing
ISSN: 0028-0836
Official Date: 5 February 2020
Dates:
DateEvent
5 February 2020Published
13 December 2019Accepted
Volume: 578
Number: 7793
Page Range: pp. 53-59
DOI: 10.1038/s41586-020-1958-9
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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