CERN/LHCC 96-44

LHCC 25

11 November, 1996

LARGE HADRON COLLIDER COMMITTEE

Minutes of the twenty-fifth meeting held on Thursday and Friday,
31 October and 1 November 1996

OPEN SESSION :

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

2. Status report on ALICE (J.Schukraft)

3. ALICE muon arm Technical Proposal LHCC 96-32/P3 Add. 1 (H.Gutbrod)

CLOSED SESSION :

Present: J.Bernabeu, R.J.Cashmore, C.Dionisi*, P.J.Dornan, J.Ellis, J.Engelen, L.Foa, B.Foster, U.Goerlach, A.Golutvin, D.Hartill, H.J.Hilke (representing G.Goggi), E.Iarocci (Chairman), P.Igo-Kemenes*, C.Llewellyn Smith*, N.McCubbin, H.Montgomery, K.Potter, A.Read, A.Schopper*, A.Schwarz, D.M.Sendall (Secretary), P.Sharp, M.Spiro, M.Turala, H.Wenninger*, D.O.Williams, G.Wormser.

*) Part time

Apologies: L.DiLella, L.R.Evans, H.Kolanoski, M.Mazzucato, K.Nishikawa, G.Rolandi

(U.Becker was present for points 7 and 8).

1. The Chairman and the Director General welcomed the new members of the Committee. The Director General thanked the retiring members for their essential contribution to the definition of the LHC experimental programme. The minutes of the twenty-fourth LHCC meeting (LHCC 96-31 / LHCC 24) were approved without amendment.

2. REPORT FROM THE COST REVIEW GROUP

W.Bartel gave a report on the activities of the CORE group, including recent changes in membership. He reported on the work of evaluating the ALICE cost estimates for the baseline detector, covering tracking, particle identification, photon spectrometer, forward detector, muon arm, DAQ/trigger and infrastructure. The ALICE estimates had been carefully made, and although some areas of concern were identified, CORE found no major problem. A report will be submitted to the LHCC in December. Estimates of manpower requirements have also been made, which match the manpower likely to be available in the collaborating institutes.

The LHCC also discussed the procedure for the CORE reviews of ATLAS and CMS. The collaborations will submit an updated version of their overall costing by 3 February 1997. CORE will then review the detailed costing presented in each Technical Design Report as it appears, and check it with respect to the overall costing. The first TDR to be presented will be the ATLAS calorimeter: CORE will make a presentation on this to the LHCC at its 13-14 March 1997 meeting.

3. REPORT FROM THE ALICE REFEREES

The committee heard reports from the referees on the muon spectrometer, on DAQ and electronics as reviewed with the consultants, on particle identification by time-of-flight, and on physics issues.

4. DISCUSSION OF ALICE

The committee congratulates the collaboration on the substantial work done to prepare the muon spectrometer addendum to the technical proposal. It is pleased to note that the collaboration considers the muon spectrometer to be an integral part of the experiment.

As the referees have followed closely the evolution of the muon spectrometer, and have reported regularly on it, the committee felt able to discuss it thoroughly. The committee concluded that the proposed muon spectrometer will allow a comprehensive measurement of the Debye screening phenomenon.

The committee proceeded to a discussion of outstanding detector issues concerning the central rapidity region, in particular particle identification by time-of-flight. The committee appreciates the significant progress made in the development of Pestov counters and Parallel Plate Chambers, as reported at the open session.

The committee concluded that the progress made in these two technologies, taken in conjunction with the existence of a scintillator option, offers a viable technological solution for the time-of-flight which meets the essential physics goals.

The committee noted the conclusion of CORE that the baseline proposal of ALICE could be constructed at the estimated cost. The committee also heard a preliminary estimate of the financial resources likely to be available for ALICE.

Accordingly, the committee is minded to recommend general approval of the ALICE technical proposal in its entirety (LHCC 95-71 / P3 and LHCC 96-32 / P3 Add.1) at its January 1997 meeting. However, before doing so a clear schedule will be required for the milestones and Technical Design Reports.

5. REPORT ON THE SUSY WORKSHOP

J.Ellis presented a summary of the one-day supersymmetry workshop on 30 October 1996. He drew attention to the impressive progress which has been made in understanding the potential of the LHC for supersymmetry studies. Although further work will be needed, it is already clear that the physics reach of the LHC for supersymmetric particles will be considerable, that multiple measurements will be possible, and that some model parameters could be determined with high precision.

The committee took note of the substantial progress made, and congratulated all those concerned with the workshop, including J.Ellis for his catalytic role. The LHCC notes with approval the intention to produce a CERN report on this work on the timescale of about one year from now.

6. REPORT FROM THE LHCC ELECTRONICS BOARD

P.Sharp reported on the work of the LEB. He outlined the membership and the working methods envisaged. At its first meeting, the LEB identified a number of issues of particular significance to the LHC collaborations. Priorities have been set, and a calendar for future work established. He reported on the second workshop on electronics for LHC experiments held in Balatonfured in September 1996. In view of the success of the first two workshops, the LEB has decided to continue to hold workshops in future, though with some changes of format: the next is planned at Imperial College London in September 1997.

P. Sharp reviewed the situation on radiation-hard technology, and drew attention to the need for further work in the area of radiation-tolerant technology.

The LHCC thanked all those involved in organising the workshops and in ensuring a smooth transition from the work of LERB.

7. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees, including a review of status and plans for the muon system and the inner detector, undertaken in conjunction with members of the LHCC Consultants Group.

8. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees, including a review of status and plans for the electromagnetic calorimeter. R&D effort is presently concentrated on investigations of short term radiation damage and self annealing effects in the crystals.

9. TEST BEAMS

A. Schopper presented the test beam requests and the draft SPS fixed target programme for 1997. Apart from substantial reductions relative to requests for LHC-B no major reductions are foreseen, although some potential scheduling problems remain to be resolved, especially towards the end of proton running. The final version is expected in January 1997. A. Schopper summarised the evolution in the overall share of fixed target running used by the LHC programme.

10. REPORT ON EXPERIMENT MAGNETS

T.Taylor reported on recent substantial internal reviews of the ATLAS and CMS magnets, carried out with the help of external reviewers including members of the LHCC Magnet Advisory Group. He noted the impressive amount of progress and the thorough nature of the reviews, and drew attention to some areas of concern.

The MAG had also discussed the ALICE muon spectrometer magnet, in particular the relative merits of warm and superconducting solutions.

11. REFEREES

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

ALICE: J.Ellis, U.Goerlach (Co-ordinator), N.McCubbin

ATLAS: A.Golutvin, H.Montgomery (Co-ordinator), G.Rolandi, A.Schwarz, M.Spiro

CMS: C.Dionisi, J.Engelen (Co-ordinator), H.Kolanoski, A.Read, G.Wormser

LHC-B: J.Bernabeu, B.Foster, D.Hartill (Co-ordinator), K.Nishikawa

For the ATLAS and CMS computing technical proposals, a small group of experts led by M.Kasemann will be nominated to work closely with the referees.

12. PROVISIONAL DATES FOR 1997 MEETINGS

23 - 24 January

13 - 14 March

5 - 6 June

10 - 11 July

4 - 5 September

5 - 6 November (nb. Wednesday and Thursday)

The LHCC received the following documents

o ALICE collaboration: The forward muon spectrometer. Addendum to the ALICE Technical Proposal (LHCC 96-32 / LHCC P3 Add.1)

o J.Bjorken, K.Eggert, C.Taylor: Progress report about FELIX (LHCC 96-37) *

o LHC-B collaboration: Status and plan of R&D for the RICH detectors of LHC-B (LHCC 96-38) *

* Restricted circulation only.

D. M. Sendall

E-mail: LHCC.Secretary@CERN.CH

Tel. 74968

LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424

Janet.Grant@CERN.CH