CERN/LHCC 94-41

LHCC 13

24 November, 1994

LARGE HADRON COLLIDER COMMITTEE

Minutes of the thirteenth meeting held on Wednesday, 9 November 1994

CLOSED SESSION :

Present: J.V.Allaby, 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, E.Fernandez, L.Foa, A.Golutvin, E.Iarocci, P.Igo-Kemenes, P.G.Innocenti, K.Kajantie, V.Khovansky, C.Llewellyn Smith*, G.W.London, H.Montgomery, K.Potter, K.Pretzl, D.M.Sendall (Secretary), D.O.Williams*, G.Wormser.

*) Part time

Apologies: K.Einsweiler, U.Goerlach, G.Mikenberg, K.Schubert, M.Turala, H.Wenninger, S.Yamada

1. The Chairman and the Director-General welcomed the new members of the Committee. The minutes of the twelfth LHCC meeting (LHCC 94-36 / LHCC 12) were approved without amendment.

2. C.Llewellyn Smith gave a brief summary of recent developments around the LHC project. L.Evans summarised the current situation of the machine design. A review has permitted 7 GeV to be achieved with a lower magnetic field. Magnet tests are continuing satisfactorily.

3. REPORTS ON CRYSTALS FROM CMS

T.Virdee presented test beam results and physics performance prospects. CMS has now made a choice of PbWO4 for the electromagnetic calorimeter. P.Lecoq presented R&D results on PbWO4 properties and production, and outlined further work to be done. H.Hofer discussed issues of costs and planning.

4. REPORT FROM CORE

W.Bartel reported on the recent work and plans of the Costs Review Group. CORE proposes a deadline of 19 January 1995 for the submission of detailed cost estimates by ATLAS and CMS. CORE intends to make a preliminary report for the March meeting of the LHCC, and a fuller report for the May neeting. It is assumed that CORE will then go on to review the cost estimates of ALICE and LHC-B.

5. FUTURE OPERATION OF THE LHCC

The Chairman outlined the proposed working methods for the groups of experts who will advise the LHCC on specialised topics.

Following the changes of LHCC membership, the referees are now as follows:

ATLAS: P.Duinker, F.Eisele (Coordinator), A.Golutvin, P.Igo-Kemenes, H.Montgomery

CMS: R.J.Cashmore (Coordinator), E.Iarocci, C.Dionisi, L.Di Lella, G.Wormser

ALICE: U.Goerlach, K.Kajantie, K.Pretzl

B physics: P.J.Dornan, J.Ellis, K.Schubert, J.Bernabeu

6. EXPERIMENTAL AREAS

K.Potter summarised the current situation on possibilities for experiments at the various intersections, with the latest cost estimates.

7. REPORTS FROM THE DRDC

G.Hall reported on semiconductor detectors using silicon (RD-2, RD-19, RD-20, SDC), GaAs (RD-8) and diamond (RD-42). R.Bellazzini reported on MSGCs in RD-28. L.Rossi reported on straw tubes in RD-6. V.Eckart reported on muon chambers in RD-5.

8. "FURTHER PHYSICS" WORKSHOP

J.Ellis presented a provisional agenda for the workshop. In view of the encouraging response, it was agreed to extend the workshop to the morning of 30 November.

9. K.Potter gave a first reaction of the machine experts to the paper LHCC 94-39 by the Totem collaboration, on high-beta insertion. While there seems to be some hope of achieving longer effective lengths for beta values of up to 3000m, significantly higher values of beta are considered unrealistic.

10. TIMETABLE AND FUTURE MEETINGS

The "further physics" workshop will take place on 29-30 November. To avoid a problem with Restricted ECFA, the September 1995 meeting of the LHCC will be advanced one day to 13-14 September.

11. DATES FOR 1994 MEETINGS

29-30 November (workshop on further physics topics)

12. DATES FOR 1995 MEETINGS

19-20 January

29-31 March

16-19 May

6-7 July

13-14 September (note change)

16-17 November

The LHCC received the following document:

o TOTEM Collaboration: Total cross section, elastic scattering and diffraction dissociation at LHC: an evaluation of a high-beta insertion (LHCC 94-39)