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The Meson Production Targets in the high energy beamline of HIPA at PSI
by D. Kiselev, P. A. Duperrex, S. Jollet, S. Joray, D. Laube, D. Reggiani, R. Sobbia, V. Talanov
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Submission summary
| Authors (as registered SciPost users): | Daniela Kiselev |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202105_00043v1 (pdf) |
| Date submitted: | 2021-05-30 16:29 |
| Submitted by: | Kiselev, Daniela |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | Review of Particle Physics at PSI (PSI2020) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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Abstract
Two target stations in the 590 MeV proton beamline of the High Intensity Proton Accelerator (HIPA) at the Paul Scherrer Institut (PSI) produce pions and muons for seven secondary beamlines, leading to several experimental stations. The two target stations are 18m apart. Target M is a graphite target with an effective thickness of 5mm, Target E is a graphite wheel with a thickness of 40 mm or 60 mm. Due to the spreading of the beam in the thick target, a high power collimator system is needed to shape the beam for further transport. The beam is then transported to either the SINQ target, a neutron spallation source, or stopped in the beam dump, where about 450 kW beam power is dissipated. In the following, the targets, collimators and beam dumps are further described.
Current status:
Reports on this Submission
Report #3 by Claude Petitjean (Referee 3) on 2021-6-21 (Invited Report)
- Cite as: Claude Petitjean, Report on arXiv:scipost_202105_00043v1, delivered 2021-06-21, doi: 10.21468/SciPost.Report.3091
Strengths
1) detailed and comprehensive review of PSI's meson production target stations
2) good description of the history and how technical problems were solved and improved
3) nice illustrations of the target wheels and related components
Weaknesses
1) the english could be improved by a professional person with native English origin
Report
The PSI target group led by D. Kiselev presents a very detailed and lively report about the history and all technical aspects of PSI's meson production target stations M & E and the collimator systems. It is a good description of the problems encountered in the past up to now and how they were gradually solved and improved. The papers content is of high technical value and therefore absolutely fit for publication in the SciPost journal.
Requested changes
1) Abstract, last sentence: leave off "In the following" and"further"
2) lines 15 and 43: say ".. described in Ref. [2] (section 2).." to make clear that it is not a section of this paper
3) line 16: leave off "last stage of the"
4) line 21: it would be appropriate to mention that the Beryllium targets were also abandoned because of the evaporation of the Be above 120 uA causing poisonous and radioactive contamination of all surrounding vacuum chamber walls.
5) line 28: insert "special": therefore special measures ..
6) line 31: leave off "mainly"
7) line 38: leave off "up to 60 MeV" (there is no real limit)
8) line 39: "by a one order of magnitude": it is rather "by a factor 3-4
9) line 206 typo "and replacement" not "ans"
10) references: It would be nice if all references show the year of appearance. in refs 1,3,8 it is missing
11) it would be appropriate to mention somewhere, that the names M&E come from the french words "mince" (thin) and épaisse (thick)! (invention of Prof. H.J. Gerber)
Report #2 by Adrian Signer (Referee 2) on 2021-6-17 (Invited Report)
- Cite as: Adrian Signer, Report on arXiv:scipost_202105_00043v1, delivered 2021-06-17, doi: 10.21468/SciPost.Report.3074
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.
Report #1 by Anonymous (Referee 1) on 2021-6-11 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202105_00043v1, delivered 2021-06-11, doi: 10.21468/SciPost.Report.3049
Report
This paper is very interesting, clearly written and deserves publication.
I have only very few remarks:
1) In the Abstract, I did not understand the number 450 kW beam power in the beam dump. The total beam power at 2.4 mA at 590 MeV is 1.4 MW. Is 1 MW lost in Target E and the collimators?
2) I think there is a typo in line 206: inspection ans replacement. Should "ans" not be "and"?
3) G. Heidenreich, M. Wohlmuther and U. Rohrer have contributed considerably to the whole project. If not in the list of authors, it might be polite to acknowledge their contributions