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arxiv: 1907.08562 · v1 · pith:3UJWZM2Jnew · submitted 2019-07-19 · ⚛️ physics.acc-ph · hep-ex

First demonstration of ionization cooling by the Muon Ionization Cooling Experiment

M. Bogomilov , R. Tsenov , G. Vankova-Kirilova , Y. P. Song , J. Y. Tang , Z. H. Li , R. Bertoni , M. Bonesini
show 127 more authors
F. Chignoli R. Mazza V. Palladino A. De Bari D. Orestano L. Tortora Y. Kuno H. Sakamoto A. Sato S. Ishimoto M. Chung C. K. Sung F. Filthaut D. Jokovic D. Maletic M. Savic N. Jovancevic J. Nikolov M. Vretenar S. Ramberger R. Asfandiyarov A. Blondel F. Drielsma Y. Karadzhov G. Charnley N. Collomb K. Dumbell A. Gallagher A. Grant S. Griffiths T. Hartnett B. Martlew A. Moss A. Muir I. Mullacrane A. Oates P. Owens G. Stokes P. Warburton C. White D. Adams V. Bayliss J. Boehm T. W. Bradshaw C. Brown M. Courthold J. Govans M. Hills J.-B. Lagrange C. MacWaters A. Nichols R. Preece S. Ricciardi C. Rogers T. Stanley J. Tarrant M. Tucker S. Watson A. Wilson R. Bayes J. C. Nugent F. J. P. Soler R. Gamet P. Cooke V. J. Blackmore D. Colling A. Dobbs P. Dornan P. Franchini C. Hunt P. B. Jurj A. Kurup K. Long J. Martyniak S. Middleton J. Pasternak M. A. Uchida J. H. Cobb C. N. Booth P. Hodgson J. Langlands E. Overton V. Pec P. J. Smith S. Wilbur G. T. Chatzitheodoridis A. J. Dick K. Ronald C. G. Whyte A. R. Young S. Boyd J. R. Greis T. Lord C. Pidcott I. Taylor M. Ellis R.B.S. Gardener P. Kyberd J. J. Nebrensky M. Palmer H. Witte D. Adey A. D. Bross D. Bowring P. Hanlet A. Liu D. Neuffer M. Popovic P. Rubinov A. DeMello S. Gourlay A. Lambert D. Li T. Luo S. Prestemon S. Virostek B. Freemire D. M. Kaplan T. A. Mohayai P. Snopok Y. Torun L. M. Cremaldi D. A. Sanders D. J. Summers L. R. Coney G. G. Hanson C. Heidt
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Pith reviewed 2026-05-24 18:48 UTC · model grok-4.3

classification ⚛️ physics.acc-ph hep-ex
keywords ionization coolingmuon beamsbeam emittanceaccelerator physicscooling cellphase space volumepion decay
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The pith

Ionization cooling of muon beams has been demonstrated for the first time.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reports the construction of a section of an ionization cooling cell and its first use to demonstrate ionization cooling of muons. Ionization cooling reduces the phase space volume of the beam by having particles lose momentum in an absorber and then being refocused by magnets. This technique is required to create high-brightness muon beams from pion decay sources, which otherwise occupy too large a volume. The measurements confirm a reduction in emittance consistent with the cooling process. This matters for enabling future muon-based accelerators for high-energy physics and neutrino research.

Core claim

A section of an ionization cooling cell has been constructed and used to provide the first demonstration of ionization cooling through a measured reduction in the beam emittance of muons.

What carries the argument

Ionization cooling cell section that removes energy via absorbers while magnets restore transverse momentum, with upstream and downstream trackers measuring the emittance change.

Load-bearing premise

The observed reduction in beam emittance is caused by ionization cooling rather than by unaccounted beam transport effects, scattering, or measurement systematics.

What would settle it

A measurement in which the emittance shows no reduction or an increase after passage through the cell, once all other effects are accounted for, would falsify the demonstration.

Figures

Figures reproduced from arXiv: 1907.08562 by A. Blondel, A. D. Bross, A. De Bari, A. DeMello, A. Dobbs, A. Gallagher, A. Grant, A. J. Dick, A. Kurup, A. Lambert, A. Liu, A. Moss, A. Muir, A. Nichols, A. Oates, A. R. Young, A. Sato, A. Wilson, B. Freemire, B. Martlew, C. Brown, C. G. Whyte, C. Heidt, C. Hunt, C. K. Sung, C. MacWaters, C. N. Booth, C. Pidcott, C. Rogers, C. White, D. Adams, D. Adey, D. A. Sanders, D. Bowring, D. Colling, D. Jokovic, D. J. Summers, D. Li, D. Maletic, D. M. Kaplan, D. Neuffer, D. Orestano, E. Overton, F. Chignoli, F. Drielsma, F. Filthaut, F. J. P. Soler, G. Charnley, G. G. Hanson, G. Stokes, G. T. Chatzitheodoridis, G. Vankova-Kirilova, H. Sakamoto, H. Witte, I. Mullacrane, I. Taylor, J.-B. Lagrange, J. Boehm, J. C. Nugent, J. Govans, J. H. Cobb, J. J. Nebrensky, J. Langlands, J. Martyniak, J. Nikolov, J. Pasternak, J. R. Greis, J. Tarrant, J. Y. Tang, K. Dumbell, K. Long, K. Ronald, L. M. Cremaldi, L. R. Coney, L. Tortora, M. A. Uchida, M. Bogomilov, M. Bonesini, M. Chung, M. Courthold, M. Ellis, M. Hills, M. Palmer, M. Popovic, M. Savic, M. Tucker, M. Vretenar, N. Collomb, N. Jovancevic, P. B. Jurj, P. Cooke, P. Dornan, P. Franchini, P. Hanlet, P. Hodgson, P. J. Smith, P. Kyberd, P. Owens, P. Rubinov, P. Snopok, P. Warburton, R. Asfandiyarov, R. Bayes, R. Bertoni, R.B.S. Gardener, R. Gamet, R. Mazza, R. Preece, R. Tsenov, S. Boyd, S. Gourlay, S. Griffiths, S. Ishimoto, S. Middleton, S. Prestemon, S. Ramberger, S. Ricciardi, S. Virostek, S. Watson, S. Wilbur, T. A. Mohayai, T. Hartnett, T. Lord, T. Luo, T. Stanley, T. W. Bradshaw, V. Bayliss, V. J. Blackmore, V. Palladino, V. Pec, Y. Karadzhov, Y. Kuno, Y. P. Song, Y. Torun, Z. H. Li.

Figure 1
Figure 1. Figure 1: The MICE apparatus along with the calculated magnetic field, [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Distribution of the beam in phase space for the 6-140 Full LH [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The distributions of measured muon amplitudes. The upstream distributions are shown by orange [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Downstream to upstream ratio of number of events. A ratio greater than unity in the beam core [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: The upstream and downstream normalised beam density quantiles, indicated by orange and green [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 1
Figure 1. Figure 1: Distribution of amplitudes with corrected and uncorrected distribution shown for the 10-140 LH [PITH_FULL_IMAGE:figures/full_fig_p016_1.png] view at source ↗
read the original abstract

High-brightness muon beams of energy comparable to those produced by state-of-the-art electron, proton and ion accelerators have yet to be realised. Such beams have the potential to carry the search for new phenomena in lepton-antilepton collisions to extremely high energy and also to provide uniquely well-characterised neutrino beams. A muon beam may be created through the decay of pions produced in the interaction of a proton beam with a target. To produce a high-brightness beam from such a source requires that the phase space volume occupied by the muons be reduced (cooled). Ionization cooling is the novel technique by which it is proposed to cool the beam. The Muon Ionization Cooling Experiment collaboration has constructed a section of an ionization cooling cell and used it to provide the first demonstration of ionization cooling. We present these ground-breaking measurements.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The manuscript reports that the MICE collaboration has constructed a section of an ionization cooling cell and used it to provide the first demonstration of ionization cooling, presenting the associated ground-breaking measurements of beam emittance reduction.

Significance. If substantiated with quantitative data and systematic controls, the result would be highly significant for accelerator physics: it supplies the first experimental validation of ionization cooling, a technique essential for producing high-brightness muon beams suitable for lepton colliders and precision neutrino sources. The work is an experimental measurement rather than a derivation, providing direct empirical evidence.

major comments (2)
  1. [Abstract] Abstract: the claim of a successful demonstration supplies no quantitative emittance values, error bars, control measurements, or data-selection criteria, so the numerical support for the central claim cannot be assessed from the provided text.
  2. [Results] The attribution of any observed upstream-to-downstream emittance change to ionization energy loss in the absorber (rather than beam transport, multiple scattering in windows/trackers, or reconstruction biases) requires a full end-to-end simulation including all material and magnetic fields together with a quantified systematic error budget smaller than the cooling signal; without this the weakest assumption remains untested.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their review and for highlighting areas where the presentation of our results can be strengthened. We address each major comment below and indicate the revisions we will make.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the claim of a successful demonstration supplies no quantitative emittance values, error bars, control measurements, or data-selection criteria, so the numerical support for the central claim cannot be assessed from the provided text.

    Authors: We agree that the abstract is too concise and does not convey the quantitative support present in the body of the paper. The Results section reports the measured transverse emittance reduction (with statistical and systematic uncertainties), the no-absorber control data, and the event-selection criteria. In the revised manuscript we will expand the abstract to include the key measured values and uncertainties so that the central claim can be assessed from the abstract alone. revision: yes

  2. Referee: [Results] The attribution of any observed upstream-to-downstream emittance change to ionization energy loss in the absorber (rather than beam transport, multiple scattering in windows/trackers, or reconstruction biases) requires a full end-to-end simulation including all material and magnetic fields together with a quantified systematic error budget smaller than the cooling signal; without this the weakest assumption remains untested.

    Authors: The analysis presented in the manuscript is based on a complete end-to-end Monte Carlo simulation of the entire beam line that incorporates all materials (including the absorber, windows and trackers), the magnetic fields, and the detector response. The simulation is used both to correct for reconstruction biases and to propagate the systematic uncertainties. The resulting systematic error budget is quantified in the paper and is smaller than the observed cooling signal; the no-absorber control data further isolate the contribution from ionization energy loss. We will revise the text to make the connection between the simulation, the error budget and the control measurements more explicit. revision: partial

Circularity Check

0 steps flagged

No circularity: experimental measurement with no derivation chain

full rationale

This is an experimental paper reporting direct measurements of muon beam emittance reduction in an ionization cooling cell. No mathematical derivation, ansatz, fitted parameter renamed as prediction, or self-citation load-bearing step exists in the claimed result. The central claim rests on upstream/downstream tracker data and comparison to simulation, which are external benchmarks rather than self-referential. The result is self-contained against measured observables and does not reduce to its own inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the correctness of the beam-emittance measurement chain and on the assumption that the observed reduction is caused by the cooling cell rather than by other beam-line elements.

axioms (1)
  • domain assumption Standard accelerator-physics assumptions that emittance can be extracted from tracker data with known systematics.
    The demonstration presupposes established methods for measuring transverse emittance in a muon beam line.

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Forward citations

Cited by 1 Pith paper

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Reference graph

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