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muCool: muon cooling for high-brightness μ+ beams
by Aldo Antognini and David Taqqu
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Submission summary
| Authors (as registered SciPost users): | Aldo Antognini |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202105_00041v1 (pdf) |
| Date submitted: | 2021-05-28 19:06 |
| Submitted by: | Antognini, Aldo |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | Review of Particle Physics at PSI (PSI2020) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
A number of experiments with muons are limited by the poor phase space quality of the muon beams currently available. The muCool project aims at developing a phase-space cooling method to transform a surface μ+ beam with 4 MeV energy and 1 cm size into a slow muon beam with eV energy and 1 mm size. In this process the phase space is reduced by a factor of 10^9 − 10^10 with efficiencies of 2 · 10^−5 − 2 · 10^−4 . The beam is then re-accelerated to keV-MeV energies. Such a beam opens up new avenues for research in fundamental particle physics with muons and muonium atoms as well as in the field of μSR spectroscopy.
Current status:
Reports on this Submission
Report #2 by Anonymous (Referee 2) on 2021-6-28 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202105_00041v1, delivered 2021-06-28, doi: 10.21468/SciPost.Report.3132
Report
The paper reports on an innovative concept for compressing the phase space of the currently best available mu+ beams by a factor of 1E9-1E10, essentially transforming an MeV and cm sized beam into a keV and sub-mm sized compressed beam. Such a beam could enable a new generation of fundamental and applied physics experiments. This is a major undertaking which not only requires creative ideas, but years of effort of a technically superb and dedicated team to realize.
The concepts and demonstrated stages are clearly described, and estimates and
an outlook of the final beam properties and its physics potential are given.
As all the required aspects regarding the quality of the paper are clearly met, I recommend the publication of this work.
Requested changes
I have no requested changes, but added a few suggestions for consideration by the authors.
30.2 compression scheme.
For me it would be helpful if some typical numbers are given for
$\omega$, $\nu$ and the He densities at 4 and 12 K, so that the interplay between the different regimes in eq.30.1 becomes evident.
line 81: track -> traces?
electric field -> homogeneous electric field?
Fig. 30.3 Though shown on the ordinate, perhaps mention explicitly that muon decay has been divided out
line 120. Please explain why z length is limited in the combined scheme.
30.5 It would be helpful to separate more clearly between demonstrated steps and additional steps still under active R&D in the overall project.
table 30.1 Is
Is muon decay accounted for in the first 5 us?
Report #1 by Adrian Signer (Referee 1) on 2021-6-17 (Invited Report)
- Cite as: Adrian Signer, Report on arXiv:scipost_202105_00041v1, delivered 2021-06-17, doi: 10.21468/SciPost.Report.3075
Report
We (the editors Cy Hoffman, Klaus Kirch, Adrian Signer) had the
opportunity to review an earlier draft of the article and were in
communication with the authors before the submission. All our comments
and suggestions have been taken into account. Hence, we think the
paper can now be published in the current form.