CERN/LHCC 92-15

LHCC 2

23 November, 1992

LARGE HADRON COLLIDER COMMITTEE

Minutes of the second meeting held on Thursday and Friday, 5-6 November 1992

OPEN SESSION :

1. Presentation of CMS Letter of Intent (LHCC 92-3/I 1; M. Della Negra).

2. Presentation of ATLAS Letter of Intent (LHCC 92-4/I 2; P. Jenni).

3. Presentation of L3P Letter of Intent (LHCC 92-5/I 3; S.C.C. Ting, F. Pauss).

CLOSED SESSION :

Present: J.V. Allaby, J.J.Aubert (Chairman), G.Brianti, R.J.Cashmore, L.Di Lella, P.J.Dornan, P.Duinker, F.Eisele, J.Ellis, E.Fernandez, L.Foa, W.Hoogland, E.Iarocci, P.G.Innocenti, K.Kajantie, V.Khovansky, G.W.London, L.Maiani, G.Mikenberg, A.Osborne (replacing D.O.Williams), K.Potter, K.Pretzl, C.Rubbia*, K.Schubert, D.M.Sendall (Secretary), S.Yamada

*) Part time

Apologies: K.Einsweiler

1. The minutes of the first LHCC meeting (LHCC 92-8/LHCC 1) were approved without amendment.

2. REFEREES' REPORTS

The committee heard preliminary reports from the referees: CMS (L.Foa), ATLAS (F.Eisele), L3P (R.Cashmore), Physics performance comparison (L.Di Lella, L.Maiani, J.Ellis, K.Kajantie, K.Schubert). A number of questions remain to be discussed with the collaborations, especially concerning the physics merits of various detector options.

3. EXPERIMENTAL AREAS

K.Potter reported on possible use of experimental areas. He summarised the studies made by the collaborations for experimental areas at Points 1, 2 and 7. All would involve larger or additional access shafts, and excavation of halls to avoid high buildings. Short installation times would lead to a smaller number of heavier units. So far only feasibility studies had been made. Preliminary cost figures were given.

4. SAFETY ISSUES

H.Hoffmann summarised the overall safety requirements. Safety must be built in at the design phase, and technical proposals would need to include a chapter on safety. Prior discussion would be needed between collaborations and the appropriate CERN services.

The Committee felt that although safety is not the responsibility of the LHCC, it is important to be aware as early as possible of potential problems in this area. It was therefore agreed to invite H.Schoenbacher (CERN/TIS) to the next meeting, to give his reactions to the safety implications of the Letters of Intent.

5. GENERAL DISCUSSION AND ESTABLISHMENT OF CALENDAR

The committee further discussed questions to be put to the collaborations by the referees. It was agreed that no written response would be made by the LHCC to the Letters of Intent until further discussions had been held.

On other physics topics the following timetable was agreed.

Heavy ions: Letters of Intent will be requested for late February 1993. Open presentations and a first discussion are tentatively foreseen for the meeting of 6-7 April 1993.

B physics: A workshop is proposed for May 1993. Following this, Letters of Intent will be requested for end July 1993. Open presentations and a first discussion are tentatively foreseen for the meeting of 31 August - 1 September 1993.

Other experiments: Other Letters of Intent would not be discussed before the meeting of 16-17 November 1993.

6. COSTS REVIEW GROUP

As agreed at the last meeting, a Cost Review Group has been set up. The members are F.Brasse (DESY, Chairman), F.Bourgeois (CERN), F.Dupont (CNRS), E.Fernandez (Barcelona), W.Haynes (RAL), H.J.Hilke (CERN), P.G.Innocenti (CERN), R.Koetz (DESY), P.Lazeyras (CERN), G.Mikenberg (Weizmann Inst.), K.Potter (CERN), P.Sharp (RAL), B.Righini (CERN), W.Von Rueden (CERN).

7. DATES FOR 1992 MEETINGS

Tuesday and Wednesday, 8-9 December (Closed Session Only)

8. DATES FOR 1993 MEETINGS

4-5 February

2-5 March with DRDC

6-7 April

8-9 June

31 August - 1 September

16-17 November

The LHCC received the following documents:

o The L3P Collaboration: Addendum on the options for the central tracker system and the measurement of CP-violations in B-decays (LHCC 92-13 / I3 - Addendum 1)

o The L3P Collaboration: Addendum on measurement of the suppression of deg. + deg.' in heavy ion collisions (LHCC 92-13 / I3 - Addendum 2)

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MS, 21 July 1993