CERN/LHCC 97-48

LHCC 29

21 July, 1997

LARGE HADRON COLLIDER COMMITTEE

Minutes of the twenty-ninth meeting held on Thursday and Friday,
10 and 11 July 1997

OPEN SESSION :

1. The Director-General announced that on the recommendation of the Research Board he has approved the first Technical Design report for an LHC experiment: the ATLAS Calorimetry TDR. He has also set the cost ceilings for ATLAS and CMS.

2. Status of the LHC machine: L.Evans

3. CMS Hadron Calorimeter Technical Design Report (LHCC 97-31) D.Green

4. Status report from RD8: GaAs detectors (LHCC 97-37) K.Smith

5. Status report from RD46: Liquid scintillator capillaries (LHCC 97-38) G.Martellotti

6. Status report from RD48: Radiation hardening of Si detectors (LHCC 97-39) S.Watts

CLOSED SESSION :

Present: G.Altarelli, J.Bernabeu, M.Calvetti*, C.Dionisi*, J.Engelen, L.R.Evans*, L.Foa, B.Foster, U.Goerlach, G.Goggi*, A.Golutvin, D.Hartill, E.Iarocci (Chairman), H.Kolanoski, C.Llewellyn Smith*, J. May, M.Mazzucato, N.McCubbin, A.Menzione*, H.Montgomery, K.Peach (representing G.Goggi), K.Potter, G.Rolandi, A.Schwarz, D.M.Sendall (Secretary), P.Sharp, M.Spiro, E.Tsesmelis, M.Turala, G.Wormser.

*) Part time

Apologies: K.Nishikawa, A.Read, H.Wenninger.

(T.Akesson, C.Fabjan, D.Froidevaux, H. Hoffmann were present for point 2. J.J.Blaising was present for point 3).

1. The minutes of the twenty-eighth LHCC meeting (LHCC 97-36 / LHCC 28) were approved without amendment.

2. ATLAS STATUS REPORT

P.Jenni gave a report on ATLAS, covering some issues that had arisen in recent discussions with the referees. These included calorimetry, the inner detector, the muon spectrometer, trigger and data acquisition, liquid argon cryostat design and solenoid integration, and technical co-ordination and engineering reviews.

3. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees. The report included their review of the ATLAS Inner Detector TDR performed with C.Damerell and A.Menzione as consultants, and their review of the ATLAS Muon Spectrometer TDR performed with the assistance of U.Becker as consultant. They also reported on the progress of the ATLAS Trigger, for which the Level 1 TDR is anticipated in July 1998 along with a Technical Progress Report for the higher level Triggers and Data Acquisition. J.J.Blaising and D.Ressing were consultants for the trigger.

4. ATLAS INNER DETECTOR TECHNICAL DESIGN REPORT

The committee heard a progress report on the review of the ATLAS Inner Detector TDR received in May 1997. In order to complete the review, the LHCC requests that ATLAS provide a written plan detailing the initiatives they will take with a view to reducing the material in the detector. Details of the request are contained in an ancillary document (LHCC 97-46) which describes more fully the findings of the review.

5. ATLAS MUON SPECTROMETER TECHNICAL DESIGN REPORT

The LHCC has completed its scientific and technical review of the ATLAS Muon Spectrometer TDR submitted in June 1997. The committee is impressed by the quality of the work described in the TDR, and congratulates the collaboration. The TDR gives considerable detail pertaining to the current designs and plans for construction and installation in the ATLAS experimental area, scheduled to be completed in 2004.

The TDR demonstrates performance appropriate to the physics goals of ATLAS at the LHC as laid out in the ATLAS Technical Proposal, despite a reduction in the magnetic field: this is achieved by a re-optimisation of the detector layout. The major difficulties for the Muon Spectrometer derive from the immense size of the detector and the need to maintain a high precision over all the detector. This has also to be taken in conjunction with detectors operating near the limits of performance in the harsh radiation field.

There are a number of technical issues which require resolution. These include the establishment of the final detector operating parameters and the need for system engineering. These are detailed in an ancillary document (LHCC 97-47) which describes more fully the findings of the review. In addition ATLAS is setting a series of milestones in agreement with the LHCC.

Recommendation

The LHCC recommends general approval of the ATLAS Muon Technical Design Report describing design, performance, construction and installation in 2004. The review identified some concerns which require resolution (LHCC 97-47). The LHCC considers that the information given in the TDR, along with the supplementary milestones, is reasonable. This will be used by the committee to measure and regulate the future progress of the project. This recommendation is subject to the satisfactory conclusion of the CORE cost review expected for the September meeting of the LHCC.

6. REPORT ON QUALITY MANAGEMENT

The committee heard a presentation on Quality Management by S.Quinton. The LHCC recognises the importance of this issue, and notes the efforts already made by the collaborations. The committee will invite the collaborations to report on the situation at a future meeting of the LHCC.

7. REPORT FROM THE LHC-B REFEREES

The committee heard a report from the LHC-B referees including progress on RICH, trigger and data acquisition.

8. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees, concentrating on preliminary reactions to the hadron calorimeter Technical Design Report. A reviewing schedule has been agreed, and the referees plan to make a report at the next meeting of the LHCC.

9. REPORT FROM THE ALICE REFEREES

The committee heard a report from the ALICE referees, covering progress on several milestones since the approval of the Technical Proposal. These concerned the magnet, inner tracking system, particle identification, trigger / data acquisition and muon arm. A more detailed report is foreseen for the next meeting of the LHCC.

10. REPORT FROM THE MAGNET ADVISORY GROUP

T.Taylor gave a progress report on the review of the ATLAS and CMS magnet TDRs. A full report is planned for the September meeting of the LHCC.

11. DETECTOR R&D PROJECTS

The committee heard a brief report from the referees on RD8 (GaAs detectors). The LHCC congratulates the RD8 collaboration on the quality of the results presented in their final status report. The possibility of using GaAs for high precision detectors has been clearly demonstrated. The committee notes that the present radiation resistance of GaAs has been found insufficient for its use in the difficult LHC environment.

The committee heard a brief report from the referees on RD46 (liquid scintillator capillaries). The LHCC notes the progress made so far, and invites the collaboration to submit a final status report in one year's time. The only request from the collaboration for the coming year is for short beam tests at the PS.

The committee discussed the status report of RD48 (Radiation hardening of Si detectors). In view of the close relation of this work to electronics, and the involvement of the collaborations, the LHCC is referring this project to the LEB, which will set milestones for a further year of work.

12. REPORT FROM THE LHCC COMPUTING BOARD

M.Mazzucato reported on the work of the LCB, covering a number of topics discussed at their recent meetings: further details can be found in the LCB minutes.

The LCB has reviewed the final status report of RD41 (object oriented approach to software development). The LCB recognises the important work done by the RD41 collaboration in contributing to the adoption of Object Oriented programming techniques for future software development in ATLAS and CMS, even though some of the work specified in the milestones was not fully completed. The project is now concluded.

The LCB has reviewed the status reports of RD44 (GEANT 4) and RD45 (persistent object manager). The LCB considers that the milestones set by the LCRB for these projects have been achieved. The LCB recommends the continuation of both projects for another year, and has set a number of milestones.

The LHCC endorsed these conclusions.

The LCB has also reviewed a number of common projects. The LCB endorses the project execution plan (PEP) of "LHC++" (object oriented successor to CERNLIB), and recommends its continuation for another year. The LCB has considered a proposal for a project on videoconferencing support for LHC experiments. The LCB recommends approval of phase 1 of this project by the CERN management, up to the end of 1998. In the case of the ROOT project (presentation and analysis tools), the LCB notes that the conditions for proposing it as a common project are at present not met. Two other common projects are currently under discussion, for a software development environment and for slow controls.

A computing workshop is planned for the beginning of 1998.

13. TEST BEAMS

E.Tsesmelis presented the status of the SPS and PS schedules. A revised 1997 SPS fixed target programme has been discussed and agreed with users.

Upgrade work on the PS East Hall, as approved by the Research Board in October 1996, will start in September 1997 so that first beams are available in June/July 1998.

14. DATES FOR 1997 MEETINGS

4 - 5 September

5 - 6 November (nb. Wednesday and Thursday)

15. PRELIMINARY DATE FOR FIRST 1998 MEETING

15 - 16 January

The LHCC received the following documents

o CMS Collaboration: Hadron Calorimeter Technical Design Report (LHCC 97-31/TDR 2)

o RD8 Collaboration: Status Report LHCC / RD8 (LHCC 97-37)

o RD46 Collaboration: Status Report LHCC / RD46 (LHCC 97-38)

o RD48 Collaboration: Status Report LHCC / RD48 (LHCC 97-39)

o RD44 Collaboration: Status Report LCB / RD44 (LHCC 97-40)

o RD41 Collaboration: Status Report LCB / RD41 (LHCC 97-42)

o Cost Review Group CORE: Report on ATLAS calorimetry (LHCC 97-43) *

o ATLAS referees: Review of ATLAS Inner Detector Technical Design Report (LHCC 97-46) *

o ATLAS referees: Review of ATLAS Muon Spectrometer Technical Design Report (LHCC 97-47) *

* 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