INTERIM REPORT on MANX after MICE

1. INTERIM REPORT on MANX after MICE Preamble Several presentations related to the uses of the MICE infrastructure after MICE PHASE II were made at CM22. The MICE executive board “concluded thatit would be god (sic) if a smaller group of MICE physicists would take the time to go through these various proposals (by any means they see fit1) and answer specific questions which are within our competence as MICE and produce a short report ”. The question “which is the most relevant R&D program after MICE’’ was excluded as not being within MICE competence. 1 Waterboarding was excluded MANX interim CM23

2. Scope • The questions suggested by the EB were: • Space-consistency in the MICE hall • Scope and adequacy of proposals in view of existing • MICE instrumentation, and • Infrastructure • Consistency of time scales • Comment on resources available from MANX and MICE • Good use of MICE infrastructure resources • Committee • John Cobb (chair) • Chris Rogers • Malcolm Ellis • Yoshi Kuno • keeping the MICE Spokesman informed MANX interim CM23

3. After consulting the MICE spokesman it was decided that MANX was the most developed current proposal and that the committee should concentrate principally on MANX. Nevertheless there are other possible experiments which could use some or all of the MICE infrastructure, and these should be considered similarly in the near to medium term. Initial information about MANX was obtained from the latest MANX proposal [1], supplemented by specific questions to the MANX spokesman (R. Johnson). [1] http://www.muonsinc.com/tiki-download_wiki_attachment.php?attId=305&page=Papers%20and%20Reports MANX interim CM23

4. BRIEF MANX OVERVIEW • Two possible configurations • ‘With Matching’ • Requires extra matching sections • ‘Off-axis’ • Inject & extract beam at an angle 3 m long He-filled Helical Cooling Channel  6D cooling MANX interim CM23

5. MANX CONDITIONS & INSTRUMENTATION • From MANX proposal: • 350 MeV/c muons in  150 – 200 MeV/c out • Longitudinal momentum measurements by Hi-res TOFs • Up- & Down-stream • ~4pSec resolution using MCP PMTs • Being developed • HCC interspersed with fibre tracker planes • Expect factor ~2.5 (6-D) cooling in 3m HCC • Starting from 40mm transverse emittance & 8m longitudinal • >> Largest MICE emittance of ~10mm • What is performance for ‘standard’ MICE beams? • Including internal fibre planes • What resolutions are required? MANX interim CM23

6. OFF-AXIS MANX Presumably requires N periods to be all in one plane (?) • Smaller experiment – no matching sections • More money for cooling rather than matching • But 50% losses into downstream spectrometer • MANX also considering 0.5m matching sections • One end close to iron shield wall • Space for services close to wall? • Possible large error fields? • Magnetics & Forces • Transfer of non-axial magnetic/quench forces • Torques on Spectrometer coils • Not designed for these • Probably ‘Show Stoppers’ & did not consider OAM further MANX interim CM23

7. SPACE CONSISTENCY – MATCHED MANX MANX interim CM23

8. SCOPE & ADEQUACY of INSTRUMENTATION MANX interim CM23

9. SCOPE & ADEQUACY of INSTRUMENTATION - 2 MANX interim CM23

10. MICE INFRASTRUCTURE – BEAM MANX interim CM23

11. INFRASTRUCTURE – SPECTROMETERS MANX interim CM23

12. INFRASTRUCTURE – 2 MANX interim CM23

13. INFRASTRUCTURE – 3 MANX interim CM23

14. TIMESCALES MANX interim CM23

15. EFFORT NEEDED MANX interim CM23

16. SUPPORT – Stating the obvious, perhaps • MANX proposal assumes much of MICE will exist • MICE is a collaboration • Infrastructure is not (yet) a facility • Operated by MICE collaborators • Instrumentation is not owned ‘in common’ by MICE • Owners of instrumentation may have own preferences or funding agency constraints • ‘MICE’ itself cannot agree to support any new initiative • MANX – or any new cooling experiment – at RAL would probably require substantial UK involvement • RAL is small part of MICE • Not same relationship to users as CERN or Fermilab MANX interim CM23

17. SUPPORT Straw poll of some members of MICE with some responsibilities for infra-structure or instrumentation was conducted in order to obtain an idea of support for anon-specificfuture experiment & indication of attitude of funding agencies. It was indicated that ‘No comment’ would be a valid response. (Five still to reply.) Responses (paraphrased) : ‘No comment…, sine qua non to finish MICE ’ ‘Will discuss & respond shortly’ ‘Difficult to foresee future; …will consider’ ‘Would hand over [ ] to RAL; involvement would depend on details of experiment’ ‘Would support… if MICE supports & US supports strongly’ ‘NF is important; would support [infrastructure] & recruit’ ‘Probably welcomed by STFC… support the development of a proposal for an appropriate and realistic experiment with enthusiasm …Hall… & UK contributions… would be available’ Qualified support; STFC would most likely support a new initiative. Would require UK & other groups to agree on a program & apply for new funding. MANX interim CM23

18. ADAPTING MANX to MICE • 3m MANX not well matched to MICE instrumentation • Shorten MANX • MICE instrumentation should work 150 – 240 MeV/c • Shorten MANX to ~1.5m • 240 MeV/c in  150 MeV/c out (v. roughly): • Should still be plenty of cooling • Would ease upstream PID • Would ease matching & engineering • Match into 4 Tesla instead of 6 Tesla • Smaller He requirements • ~1300 litres • Still large; still couldn’t use LH2 systems • Downstream TOFs would still require space & area (~1m2) • Use TPC instead (?) MANX interim CM23

19. SUMMARY (1 / 2) Off-Axis MANX may have engineering difficulties associated with transfer of non-axial forces, and torques on the spectrometer cold masses; it was not considered in detail. Matched MANX has no obvious space incompatibilities; the space required for the helium system needs to be assessed. The MICE LH2 systems would be too small for a LH2-filled HCC; the RF systems would be redundant. The resolutions required by MANX are not precisely specified but the MICE spectrometers appear more than adequate for transverse measurements; the TOFs could provide a momentum resolution of 1% at 200 MeV/c to 3% at 350 MeV/c, but degraded by straggling. The Cerenkovs would not be adequate at 350 MeV/c. The down-stream PID detectors may be too small, given the space required for the downstream TOFs for longitudinal momentum measurements. MANX interim CM23

20. SUMMARY (2 / 2) Engineering considerations (margins and forces) suggest it may not be possible to operate the MICE spectrometers to match into the 6T HCC field required for an input beam of 350 MeV/c. [To confirm] A shortened MANX, using a 240 MeV/c input beam, could be a better match to the MICE instrumentation. If the MICE software is to be used for MANX some effort should soon be devoted to its adaptation and use to demonstrate the performance of MANX with the MICE (or other) instrumentation. The effort required to design… and install MANX, and to maintain the MICE infrastructure and instrumentation should be quantified. The timescale looks rather optimistic, given the available resources. There is some support within MICE, with qualifications, for a (non-specific) second generation experiment at RAL; a strong UK presence would be necessary. MICE itself could not agree to any next experiment; a new collaboration would be required. MANX interim CM23

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