CERN/LHCC 94-25

LHCC 11

17 June, 1994

LARGE HADRON COLLIDER COMMITTEE

Minutes of the eleventh meeting held on Tuesday and Wednesday, 7-8 June 1994

OPEN SESSION :

1. Status of the LHC project (C.Llewellyn Smith)

2. Status of the LHC machine (L.Evans)

3. Presentation of CMS Status Report (LHCC 94-20; M.Della Negra)

4. Presentation of ATLAS Status Report (LHCC 94-22; B.Mansoulie)

CLOSED SESSION :

Present: J.V.Allaby, J.J.Aubert (Chairman), R.J.Cashmore, L.Di Lella, P.J.Dornan, P.Duinker, K.Einsweiler, F.Eisele, J.Ellis, L.R.Evans*, E.Fernandez, L.Foa, W.Hoogland, E.Iarocci, P.G.Innocenti, K.Kajantie, V.Khovansky, C.Llewellyn Smith*, G.W.London, G.Mikenberg, K.Potter, K.Pretzl, K.Schubert, D.M.Sendall (Secretary), M.Turala, H.Wenninger*, D.O.Williams

*) Part time

Apologies: S.Yamada

1. The minutes of the tenth LHCC meeting (LHCC 94-17 / LHCC 10) were approved without amendment.

2. CMS REFEREES' REPORT AND CONCLUSIONS

The committee heard a report by the CMS referees, who had had several meetings with the collaboration. CMS had made progress in setting up an organisation taking into account the considerably increased numbers of collaborators.

The LHCC considered the status report of CMS, noted the progress on the milestones, and was aware that substantial work remains to be done.

Therefore in proceeding towards the Technical Proposal the LHCC considered that the engineering effort is inadequate and should be increased. In particular an increase of support from CERN is urgently needed. Furthermore it is essential that the support in the CMS institutes is more effectively mobilised.

In preparing the Technical Proposal it is essential that:

i) the engineering of the inner tracker and the subsystem aspects of the gas microstrip chambers receive adequate attention;

ii) the forward muon detector is optimised;

iii) the performance of the shashlik detector is presented based on sufficient test-beam data.

The LHCC also notes that the collaboration is continuing work on crystals and glasses as options for the electromagnetic calorimeter and would like to receive a presentation of the results and calorimeter possibilities at one of its next meetings.

3. ATLAS REFEREES' REPORT AND CONCLUSIONS

The committee heard a report by the ATLAS referees, who had had several meetings with the collaboration.

The LHCC acknowledges the good progress of ATLAS towards meeting the milestones set. The committee is concerned about the need to enlarge the experimental area in view of costs. The collaboration is asked to work out a solution which does not increase the overall cost of the experiment including the experimental area.

The LHCC acknowledges the efforts of ATLAS to start detailed time planning for the project. The collaboration is asked to address in the Technical Proposal specifically and in detail the steps and timescales necessary to come to well tested and optimised designs suitable for mass production for all major subsystems.

4. B PHYSICS REFEREES' REPORT AND CONCLUSIONS

The referees presented their report on the Letters of Intent for dedicated B physics experiments, taking into account the status reports and their recent discussions with the collaborations. In the subsequent discussion, the LHCC agreed on a recommendation to be sent to the Director General for consideration by the Research Board. A copy of this recommendation is attached to the minutes.

5. GUIDELINES FOR ALICE TECHNICAL PROPOSAL

The guidelines (LHCC 94-21 rev.) were discussed and agreed.

6. COST REVIEW GROUP

The Chairman introduced W.Bartel (DESY) who replaces F.Brasse as Chairman of the Cost Review Group. W.Bartel presented proposed guidelines from CORE for the ATLAS and CMS Technical Proposal. The LHCC agreed to adopt these guidelines, which will be circulated as an LHCC document. The future plans of CORE were also outlined.

7. COMPUTING GUIDELINES

F.Eisele presented a revised version of the computing guidelines (LHCC 94-16 rev.) following discussions with the collaborations and J.Harvey. The intention was to separate questions which could be answered in the Technical Proposal from topics which would need time for more detailed work. The LHCC agreed to adopt these guidelines. In the discussion it was suggested that a further software technical proposal could be requested for around the end of 1996.

F.Eisele expressed his concern about software in general for the LHC experiments. He raised a number of issues on support and on training in modern methods, which will be considered by the CERN management.

8. PHYSICS BENCHMARKS FOR ATLAS AND CMS

J.Ellis presented a revised version of the physics benchmarks following a number of comments he had received. After discussion the LHCC agreed on the content. J.Ellis will produce guidelines for the collaborations based on this.

9. COLLABORATION MANAGEMENT AND RELATIONS WITH CERN

L.Foa presented some first ideas on the way in which these might need to evolve to cope with the scale of LHC experiments. The committee discussed these informally.

10. WORKSHOP ON FURTHER PHYSICS TOPICS

J.Ellis reported on further input received on possible topics of interest. It was agreed to hold a one-day workshop on 29 November. The topics were grouped in areas, with convenors nominated as follows:

J.Ellis: Forward collider physics (diffraction and rapidity gaps, double diffraction, elastic / total cross-sections, Centauros, disordered chiral condensate etc.)

L.Di Lella: Neutrino physics (parasitic beams, LHC transfer line, dedicated target)

K.Kajantie: Other heavy ion physics (gamma-gamma, colour screening etc.)

Convenor to be nominated: Physics with gas-jets and extracted beams (polarisation, Lambda-c magnetic moment etc.)

J.Ellis: Exotica (non-perturbative electroweak interactions, dark matter candidates, monopole / quark searches etc.)

Anyone interested in contributing to the workshop is invited to contact the appropriate convenor

11. OTHER BUSINESS

It was agreed that the August meeting would be a one-day meeting on 31 August.

On behalf of the committee, the Chairman thanked the outgoing Research Director W.Hoogland for his contribution to the work of the LHCC, and expressed his appreciation for W.Hoogland's constructive guidance and cooperation during the first two years of the committee's existence.

12. DATES FOR 1994 MEETINGS

31 August

9-10 November

29 November (workshop on further physics topics)

The LHCC received the following documents

o CMS Collaboration: CMS Status Report and Milestones (LHCC 94-20)

o ATLAS Collaboration: Progress Report on ATLAS Milestones (LHCC 94-22)

o COBEX Collaboration: COBEX Status Report No. 2 (LHCC 94-23)*

o GAJET Collaboration: Additional Comments to the LHCC questions (LHCC 94-24)*

o LHB Collaboration: List of LHB members (LHCC 94-27)*

o Magnet Advisory Group: memorandum on magnets for GAJET, LHB and COBEX (LHCC 94-28)*

o J. Harvey: Suggested guidelines on computing for technical proposal (LHCC 94-16)*

* Restricted circulation only.