CERN/LHCC 95-41

LHCC 18

7 August, 1995

LARGE HADRON COLLIDER COMMITTEE

Minutes of the eighteenth meeting held on Thursday and Friday, 6-7 July 1995

CLOSED SESSION :

Present: J.J.Aubert (Chairman), J.Bernabeu, R.J.Cashmore, L.DiLella, C.Dionisi, P.J.Dornan, P.Duinker, F.Eisele, J.Ellis, L.R.Evans*, L.Foa, A.Golutvin, H.J.Hilke (representing G.Goggi), E.Iarocci, P.Igo-Kemenes, D.Jacobs* (representing D.O.Williams), K.Kajantie, C.Llewellyn Smith*, H.Montgomery, K.Potter, A.Schopper, K.Schubert, D.M.Sendall (Secretary), M.Turala, H.Wenninger*, G.Wormser, S.Yamada.

*) Part time

Apologies: U.Goerlach

1. The minutes of the seventeenth LHCC meeting (LHCC 95-37 / LHCC 17) were approved without amendment.

2. C.Llewellyn Smith gave details of the agreement with Japan, which has made a substantial financial contribution to the LHC project and is now an Observer state. He summarised the current status of negotiations with other non-member states.

C.Llewellyn Smith also summarised the position with regard to a possible LEP-2 upgrade and its relation to the LHC programme.

L.Evans outlined some new ideas on the LHC machine. The advantages of a separate cryogenic line are now becoming clear. Plans for separate RF systems for the two beams are under consideration, and would have implications for experimental use of Point 4.

L.Foa described a scenario for how to proceed after LHCC recommendations on ATLAS and CMS.

3. REPORTS FROM THE ATLAS AND CMS REFEREES

The committee heard detailed reports by the ATLAS and CMS referees, based on extensive interactions with the collaborations. Major progress had been made in all areas since the submission of the Technical Proposals. The status of the detectors and first ideas on possible milestones for future work were presented. The referees drew attention to a number of critical items, and the Chairman was asked to follow up some of these with the collaborations.

4. REPORT FROM THE COST REVIEW GROUP

W.Bartel reported on the work of CORE. Their report (LHCC 95-39) was submitted in June; there were no substantial changes to the figures presented at the May LHCC meeting. Magnet costs are under re-evaluation, and estimates will be available for the September LHCC meeting. He drew attention to some remaining areas of concern.

5. REPORT FROM THE LERB

F.Bourgeois reported on the reviewing work of the LERB, and also the plans for the Lisbon workshop on electronics for LHC experiments. He described work on the available approaches to front-end electronics for calorimetry, as summarised in the note LHCC 95-40 from the LERB.

6. REPORT FROM THE PHYSICS PERFORMANCE REFEREES

The committee heard a report by the physics performance referees covering SUSY searches. Relatively little effort has so far gone into such studies, despite the importance of the subject. To go beyond "global" SUSY signals and explore particular regions of MSSM parameter space using more detailed signatures would require substantial effort, but could be rewarding. This could have implications for detector and trigger design, and further work should be encouraged. The idea of a SUSY workshop will be discussed at a future LHCC meeting.

7. REPORTS FROM THE ALICE REFEREES

The committee heard a report by the ALICE referees covering a number of topics related to Debye screening, and further discussed the proposals contained in the paper on this subject (LHCC 95-24).

The committee is pleased to see the muon arm proposed for the study of Debye screening, and warmly encourages ALICE to integrate this new part of the apparatus into the Technical Proposal in preparation.

8. REPORT FROM THE B PHYSICS REFEREES

The committee heard a brief status report from the B physics referees. A Letter of Intent from LHC-B is expected for the end of July. Savings could be achieved by displacing the intersection point to one end of the cavern.

9. TEST BEAMS

A.Schopper reported on the discussions of test beams at the Cogne meeting of the SPSLC. As he pointed out at the May LHCC meeting, current predictions seem likely to exceed available resources when the West Area closes down. The costs and benefits of various solutions had been discussed, including a proposal to maintain and upgrade to 200 GeV the X5/X7 beams in the West Area. The LHCC took note of the situation, and encourages further study of this solution. ATLAS and CMS will be asked to review their test-beam requirements for consideration at the November LHCC meeting. The needs of ALICE and LHC-B should also be monitored.

10. TIMETABLE AND ORGANISATION

It was agreed to invite ATLAS and CMS to make brief status reports at the September LHCC meeting in which they would be asked to cover a number of planning issues. Tentative dates for 1996 LHCC meetings were agreed.

11. DATES FOR 1995 MEETINGS

13-14 September (provisional)

16-17 November

12. TENTATIVE DATES FOR 1996 MEETINGS

25-26 January

21-22 March

23-24 May

4-5 July

12-13 September

7-8 November

The LHCC received the following documents:

o Cost Review Group CORE: Report on the evaluation of ATLAS and CMS: (LHCC 95-39) *

o LERB: Front-ends for calorimetry at LHC (LHCC 95-40) *

* Restricted circulation only.