CERN/LHCC 97-36

LHCC 28

10 June, 1997

LARGE HADRON COLLIDER COMMITTEE

Minutes of the twenty-eighth meeting held on Thursday and Friday,
5 and 6 June 1997

OPEN SESSION :

1. Status of the LHC project: L.Foa.

2. ATLAS Inner Detector Technical Design Report (LHCC 97-16, 17) A.Romaniouk, R.Nickerson, L.Rossi, S. Haywood

3. ATLAS Muon System Technical Design Report (LHCC 97-22) W.Kozanecki, F.Linde, G.Mikenberg

4. CMS status report: M.Della Negra

5. CMS Magnet Technical Design Report (LHCC 97-10) A.Herve

6. ATLAS magnet Technical Design Report (LHCC 97-18, 19, 20, 21) H.tenKate

CLOSED SESSION :

Present: G.Altarelli, W.Bartel*, U.Becker*, J.Bernabeu, C.Dionisi, J.Engelen, L.Foa, B.Foster, U.Goerlach, G.Goggi, A.Golutvin, D.Hartill, E.Iarocci (Chairman), J. May, M.Mazzucato, A.Menzione, H.Montgomery, K.Potter, A.Read*, G.Rolandi, A.Schwarz, D.M.Sendall (Secretary), M.Spiro, E.Tsesmelis, M.Turala, H.Wenninger*, G.Wormser.

*) Part time

Apologies: L.R.Evans, H.Kolanoski, C.Llewellyn Smith, N.McCubbin, K.Nishikawa, P.Sharp

(S.Wolbers was present for point 2).

1. The minutes of the twenty-seventh LHCC meeting (LHCC 97-28 / LHCC 27) were approved without amendment.

2. ATLAS AND CMS COMPUTING TECHNICAL PROPOSALS

M.Kasemann presented a report on the ATLAS and CMS Computing Technical Proposals (LHCC 96-43, LHCC 96-45), which have been reviewed by D.Boutigny, M.Kasemann, T.Naumann and S.Wolbers in co-operation with the referees.

The LHCC discussed the Computing Technical Proposals of ATLAS and CMS in the light of this report. They present computing models and plans with milestones: the challenges are enormous. The plans emphasise the flexibility necessary to take advantage of the rapid development of the computing sector and the timescales involved.

The ATLAS and CMS experiments have developed computing concepts which make use of current trends in software and hardware industries. The plans are well adapted to addressing the complex task of physics analysis of an LHC experiment. The committee congratulates ATLAS and CMS on the substantial progress made.

Within the next reviewing period, broad experience must be gained with Object-Oriented software and modern methods of software creation, and with the use of an Object Database Management System (ODBMS) for event storage and retrieval. The committee believes that common solutions are applicable in these areas and should be actively pursued. More technical comments are detailed in an ancillary document (LHCC 97-41) which also includes the agreed milestones up to 1999. The milestones for the next 2 years cover:

o the implementation for functionality and performance studies of an ODBMS for data storage and retrieval in conjunction with a mass storage system;

o the production of an object oriented analysis framework to change from FORTRAN-based programming to an Object-Oriented software approach.

The collaborations are encouraged to initiate discussions with the appropriate funding bodies and with CERN, on the upgrades to computing infrastructure needed to cope with data handling and analysis in the LHC era.

The LHCC recommends the approval of the ATLAS and CMS computing plans as described in the Technical Proposals. In 1999 the collaborations should submit Technical Progress Reports to the LHCC, discussing the achievement of the agreed milestones and presenting updated global designs and plans.

3. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees, concentrating on preliminary reactions to the inner detector and muon spectrometer Technical Design Reports. A reviewing schedule has been agreed, and the referees plan to make a report at a future meeting of the LHCC. The referees have also received reports of the first internal engineering design reviews for the calorimeter.

4. REPORT FROM THE MAGNET ADVISORY GROUP

T.Taylor reported on the work of the Magnet Advisory Group, whose membership has been revised. He summarised preliminary reactions to the ATLAS and CMS magnet Technical Design Reports. The timescale for reviewing is agreed, and a report is planned for the 4-5 September 1997 meeting of the LHCC.

5. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees including an overview of progress, status and plans for the electromagnetic calorimeter and MSGCs.

6. TEST BEAMS

E.Tsesmelis presented the status of the SPS and PS schedules. These have to be revised following the recent fire in an SPS surface building. The proposed new schedule for 1997 will probably involve the extension of SPS proton running time until November 10 while the Pb ion run will be cancelled. The 1998 schedule would then be modified to allow an early start of physics, and most of the lost ion running time in 1997 would be recovered in an extended ion run towards the end of 1998. The LHCC endorses this proposal. The ALICE collaboration is studying the effect of this scheme on their plans, and is preparing a new request for proton test beam time.

The SPS Gamma Irradiation Facility has now been commissioned and is in operation.

Studies have shown that LHC-like bunch-spacing should be feasible at the SPS. However, other means of making timing tests should be investigated.

7. DATES FOR 1997 MEETINGS

10 - 11 July

4 - 5 September

5 - 6 November (nb. Wednesday and Thursday)

8. PRELIMINARY DATE FOR FIRST 1998 MEETING

15 - 16 January

The LHCC received the following documents

o CMS Collaboration: Magnet Technical Design Report (LHCC 97-10/TDR 1)*

o ATLAS Collaboration: Inner Detector Technical Design Report Vol.1 (LHCC 97-16/TDR 4)*

o ATLAS Collaboration: Inner Detector Technical Design Report Vol.2 (LHCC 97-17/TDR 5)*

o ATLAS Collaboration: Magnet Technical Design Report (LHCC 97-18/TDR 6)*

o ATLAS Collaboration: Magnet Technical Design Report (LHCC 97-19/TDR 7)*

o ATLAS Collaboration: End-cap Toroids Technical Design Report (LHCC 97-20/TDR 8)*

o ATLAS Collaboration: Magnet Technical Design Report (LHCC 97-21/TDR 9)*

o ATLAS Collaboration: Muon Spectrometer Technical Design Report (LHCC 97-22/TDR 10)*

o D.Boutigny et al.: Report to the LHCC on the Computing Technical Proposals of ATLAS and CMS (LHCC 97-41)*

* 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