CERN/LHCC 97-53 rev.

LHCC 30

24 September, 1997

LARGE HADRON COLLIDER COMMITTEE

Minutes of the thirtieth meeting held on Thursday and Friday,
4 and 5 September 1997

CLOSED SESSION :

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

*) Part time

Apologies: L.R.Evans, C.Llewellyn Smith, K.Nishikawa, K.Potter, P.Sharp, H.Wenninger.

(R.Castaldi, E.Radermacher and T.Virdee were present for point 3) .

1. The minutes of the twenty-ninth LHCC meeting (LHCC 97-48 / LHCC 29) were approved without amendment.

2. L.Foa reported that offers have now been received for civil engineering contracts for the LHC project, and adjudication is expected at the December Finance Committee meeting.

3. CMS STATUS REPORT

M.Della Negra gave a status report on CMS, covering integration and detector optimisation, and the status of the muon system, electromagnetic calorimeter and tracker. Good progress was reported with the R&D programme for the crystals. Recent tests of MSGCs and associated electronics have given satisfactory results. Optimisation of the tracker with respect to MSGC and silicon technologies is under way, and the collaboration will probably now submit the TDR for the tracking system in April 1998.

4. REPORT FROM THE COST REVIEW GROUP

W.Bartel reported on the evaluation by CORE of the ATLAS Inner Detector and Muon Spectrometer, and the CMS Hadron Calorimeter. Based on the TDRs and the updated cost planning documents, CORE prepared a number of questions for the collaborations, and received written answers. These have been discussed with the collaborations. CORE appreciates the care taken in preparing the documents and the help provided by the collaborations in the evaluations.

The evolution of the cost estimates between 1995 and 1997 was presented. Most 1997 estimates are in line with previous assessments. CORE considers that cost estimates now have a firm basis in industrial offers and prototype costs. Both collaborations assume cost ceilings for each major component. CORE noted that the CMS Hadron Calorimeter is a US project also under review by the Department of Energy and the National Science Foundation.

The CORE report indicates that the cost estimates for these three detectors are reasonable and fit within the overall envelopes of the ATLAS and CMS cost estimates: the LHCC endorses this evaluation.

The LHCC recalled that its recommendations on the ATLAS Muon Spectrometer at the July 1997 meeting (LHCC 97-48 / LHCC 29) were "subject to the satisfactory conclusion of the CORE cost review". The LHCC notes that this condition has now been met.

5. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees, covering their review of the CMS Hadron Calorimeter TDR performed with M.Calvetti and J.Strait as consultants.

6. CMS HADRON CALORIMETER TECHNICAL DESIGN REPORT

The LHCC has completed its scientific, technical and cost review of the CMS Hadron Calorimeter 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 CMS experimental area, scheduled to be completed in 2004.

The TDR demonstrates performance appropriate to the physics goals of CMS at the LHC as laid out in the CMS Technical Proposal. The technology appears to be robust. A major challenge for the hadronic energy measurement arises from the fact that the calorimeter consists of several subsystems including the electromagnetic calorimeter, which have to operate in a strong magnetic field. A sophisticated calibration procedure is therefore required in order to maintain adequate performance.

There are a number of issues which require resolution, such as the operating point and performance of the HPDs. Further details are given in an ancillary document (LHCC 97-52) which describes more fully the findings of the review.

Recommendation

The LHCC recommends general approval of the CMS Hadron Calorimeter Technical Design Report describing design, performance, construction, and installation in 2004. The review identified some concerns which require more attention (LHCC 97-52). 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.

7. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees covering an update of their review of the Inner Detector TDR.

8. ATLAS INNER DETECTOR TECHNICAL DESIGN REPORT

The LHCC has completed its scientific, technical and cost review of the ATLAS Inner Detector TDR submitted in May 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 describes a detector which will function well in the LHC environment. Given the harsh conditions, this is a remarkable achievement.

There are benefits for the physics if the material in the tracking detector can be reduced. This has been recognised by the collaboration, and ATLAS has provided the referees with a plan to reduce this material as the collaboration takes decisions over the course of the next year. This will culminate in a written report to the referees in May 1998.

In addition to the material issues, there are a number of technical issues which require resolution. These are detailed in an ancillary document (LHCC 97-46) which describes more fully the findings of the review. ATLAS has also provided the requested supplementary milestones covering the detector production phase.

Recommendation

The LHCC recommends general approval of the ATLAS Inner Detector Technical Design Report describing design, performance, construction and installation in 2004. The review identified some concerns which require resolution (LHCC 97-46). 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.

9. REPORT FROM THE MAGNET ADVISORY GROUP

T.Taylor gave a report on the review of the ATLAS and CMS magnet TDRs.

10. ATLAS AND CMS MAGNET TECHNICAL DESIGN REPORTS

On behalf of the LHCC, the Magnet Advisory Group (MAG) has completed its review of the ATLAS and CMS Magnet TDRs submitted in May 1997. The MAG and the LHCC are impressed by the quality of the work described in the TDRs, and congratulate the collaborations. The TDRs give considerable detail pertaining to the current designs and plans for construction and installation.

The MAG is confident that these designs now merit approval to engage in the process of getting the magnets manufactured. Further improvements to the designs will probably be initiated by the industrial partners. The MAG drew attention to the importance of co-ordination between the laboratories involved. Special attention also needs to be devoted to quality control in projects of this kind. The MAG gives a more detailed review of the TDRs in its report (LHCC 97-51), which includes an agreed list of major milestones. The cost estimates made by the collaborations are judged to be reasonable.

Recommendation

On the basis of the MAG report, the LHCC recommends general approval of the ATLAS and CMS Magnet Technical Design Reports describing design, performance, construction and installation according to the schedules presented. The review identified some concerns which require resolution (LHCC 97-51). The LHCC considers that the information given in the TDRs, along with the agreed milestones, is reasonable. This will be used by the committee to measure and regulate the future progress of the projects.

11. G.Altarelli and J.Bernabeu reported on current ideas around LHC physics. They propose initiatives to promote discussions and studies, especially during the long construction period. These should help to maintain interest in the evolution of the physics. Physics performance studies will also need updating in the light of the more detailed detector designs now available. LHCC open sessions and workshops on specific topics could both contribute. A number of topics were suggested and further ideas are welcome.

The LHCC proposes to invite the ATLAS and CMS collaborations to present their potential for B physics when the LHC-B Technical Proposal is presented. The committee encourages G.Altarelli to contact the physics convenors of the collaborations to discuss further topics and to propose a calendar for further activities.

12. REPORT FROM THE LHC-B REFEREES

The committee heard a report from the LHC-B referees. Preliminary results from beam tests of the RICH prototype are encouraging. The organisation and schedule for the writing of the Technical Proposal are in place, and the collaboration plans to submit the TP in February 1998.

13. 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 primarily the Pixel, TOF and HMPID systems.

14. FELIX AND TOTEM LETTERS OF INTENT

Referees were apointed for the FELIX and TOTEM Letters of Intent.

15. MEMBERSHIP OF THE LHCC

J.Bernabeu, C.Dionisi, U.Goerlach, A.Golutvin. H.Montgomery, K.Nishikawa and G.Wormser are retiring from the Committee on 30 September. In the interests of continuity, the retiring members are invited to attend the 5 - 6 November meeting.

The following new members have been appointed from 1 October:

B.Adeva, J.Carr, A.Ereditato, M.Kasemann, R.Kephart, S.Komamiya and A.Rostovtsev.

16. DATE FOR 1997 MEETING

5 - 6 November (nb. Wednesday and Thursday)

17. DATES FOR 1998 MEETINGS

15 - 16 January

3 - 4 March (nb. Tuesday and Wednesday)

Week of 4 May (exact dates to be decided)

9-10 July

3-4 September

5-6 November

The LHCC received the following documents

o FELIX collaboration: A full acceptance detector at the LHC (LHCC 97-45 / I 10)

o TOTEM collaboration: Total Cross Section, Elastic Scattering and Diffraction Dissociation at the LHC (LHCC 97-49 / I 11)

o Magnet Advisory Group MAG: Report on (LHCC 97-51) *

o CMS referees: Review of CMS Hadron Calorimeter Technical Design Report (LHCC 97-52) *

o Cost Review Group CORE: Report on ATLAS inner detector, ATLAS muon spectrometer, and CMS hadron calorimeter (LHCC 97-54) *

* 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