CERN/LHCC 98-7
LHCC 33
10 March, 1998

LARGE HADRON COLLIDER COMMITTEE

Minutes of the thirty-third meeting held on Tuesday and Wednesday,

3-4 March 1998

OPEN SESSION :

1. LHCb Technical Proposal (LHCC 98-4): T. Nakada, H-J. Hilke

2. B physics with ATLAS: P. Eerola

3. B physics with CMS: D. Denegri

CLOSED SESSION :

Present: B. Adeva, G. Altarelli, W. Bartel*, J. Carr, J. Engelen, A. Ereditato, L. Fo, B. Foster*, G. Goggi*, D. Hartill, E. Iarocci (Chairman), M. Kasemann, R. Kephart, H. Kolanoski, S. Komamiya, C. Llewellyn Smith*, J. May, N. McCubbin, K. Potter, M. Price* (representing G. Goggi), A. Read, G. Rolandi, A. Rostovtsev, A. Schwarz, D. M. Sendall (Secretary), P. Sharp*, M. Spiro*, E. Tsesmelis.

*) Part time

Apologies: L. R. Evans, M. Mazzucato, H. Wenninger.

(R. Castaldi, M. Mannelli, E. Radermacher and T. Virdee were present for point 4) .

1. The minutes of the thirty-second LHCC meeting (LHCC 98-2 / LHCC 32) were approved without amendment.

2. L. Fo summarised the status of the LHC project. The contracts awarded so far fit well with cost and time estimates: contracts for cryo-plants are now ready. Formal agreement has been reached with the Swiss authorities for work at point 1.

3. B PHYSICS AT BABAR AND BELLE

B. Foster presented the current status and initial prospects for b physics at BaBar and Belle, reviewing the situation of the projects and the design of the experiments. He presented a possible extrapolation of their ultimate performance and a comparison with LHCb. He drew attention to the complementary nature of B factories and the LHC as far as b physics potential is concerned.

4. CMS STATUS REPORT

M. Della Negra gave a report on CMS, covering the status of the Technical Design Reports, planning, collaboration membership, costs and funding. He summarised the current status of the hadron calorimeter and magnet, where construction has started. The magnet status was reviewed by the LHCC Magnet Advisory Group in February. He presented the current design of the tracker, which has evolved since the Technical Proposal: full details will be given in the Technical Design Report to be submitted in April.

5. REPORT FROM THE COST REVIEW GROUP

W. Bartel reported on the evaluation by CORE of the CMS Muon and Electromagnetic Calorimeter projects. Based on the TDRs and updated cost planning documents, CORE prepared a number of questions for the collaboration, and received written answers. These have been discussed with the collaboration. CORE appreciates the care taken in preparing the documents and the help provided by the collaboration in the evaluations. In most cases estimates now have a firm basis in industrial offers and prototype costs. Most 1998 cost estimates are in line with previous assessments. CMS has adopted cost ceilings for each major component.

CORE considers that the cost estimates for these two detectors are reasonable and fit within the overall envelopes of the CMS cost estimates: the LHCC endorses this evaluation.

6. REPORT FROM THE LHCC ELECTRONICS BOARD

P. Sharp reported briefly on some topics covered at a recent meeting of the LEB: a fuller report will be given at a later meeting of the LHCC. On the subject of radiation tolerant electronics, recent results for .25 m NMOS processes were encouraging. However, it is unclear that commercial off the shelf components exist with the tolerance required for the LHC, where neutron fluences are much higher than in space. This problem is particularly likely to affect low-voltage power systems, and joint R&D with industry may be needed to achieve the desired characteristics.

P. Sharp also drew attention to the importance of risk management and project management. The latter will be essential to ensure the successful implementation of common approaches agreed with the electronics co-ordinators.

7. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees, covering their review of the CMS Muon TDR performed with H. van der Graaf as consultant, and of the Electromagnetic Calorimeter TDR performed with the help of M. Calvetti as consultant.

8. CMS ELECTROMAGNETIC CALORIMETER TECHNICAL DESIGN REPORT

The LHCC has completed its scientific, technical and cost review of the CMS Electromagnetic Calorimeter TDR submitted in December 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 design and plans for construction and installation in the CMS experimental area, to be completed early in 2005.

The crystal calorimeter as described in the TDR can achieve the performance appropriate to the physics goals of CMS at the LHC as laid out in the CMS Technical Proposal. According to the current design of the tracker, as presented in this closed session, the amount of material in front of the calorimeter does not seriously affect the performance. The LHCC considers it important that the material should not exceed this amount, and will monitor developments closely.

There are a few technical issues in well-defined areas to which CMS should pay attention. These are detailed in an ancillary document (LHCC 98-8) which describes more fully the findings of the review.

The LHCC review was not an engineering design review of the calorimeter structures, although the work done in this area was noted. It is recommended that CMS adopt the practice of conducting independent reviews of the Engineering Designs, including all aspects of the system. Written reports of these reviews should be made available to the LHCC through its referees.

Recommendation

The LHCC recommends general approval of the CMS Electromagnetic Calorimeter Technical Design Report describing design, performance, construction, and installation in 2004 and early 2005. In order for this goal to be credible, it is essential that the pre-production runs for the crystals be successfully carried out in a timely way. The review identified some concerns in limited areas, which require resolution (LHCC 98-8). The LHCC considers that the schedules given in the TDR are reasonable. However, a set of milestones should be agreed with the referees, to allow the committee to measure and regulate the future progress of the project.

9. CMS MUON PROJECT TECHNICAL DESIGN REPORT

The LHCC has completed its scientific, technical and cost review of the CMS Muon Project TDR submitted in December 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.

There are a few technical issues in well-defined areas to which CMS should pay attention. These are detailed in an ancillary document (LHCC 98-9) which describes more fully the findings of the review.

The LHCC review was not an engineering design review of the muon structures, although the work done in this area was noted. It is recommended that CMS adopt the practice of conducting independent reviews of the Engineering Designs, including all aspects of the system. Written reports of these reviews should be made available to the LHCC through its referees.

Recommendation

The LHCC recommends general approval of the CMS Muon Project Technical Design Report describing design, performance, construction, and installation in 2004. The review identified some concerns in limited areas, which require more attention (LHCC 98-9). The LHCC considers that the schedules and milestones given in the TDR are reasonable. They will be used by the committee to measure and regulate the future progress of the project.

10. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees. They reviewed the situation and plans for the electromagnetic calorimeter "Module-0", the studies currently under way on the tile calorimeter, and the prospects for b physics.

11. REPORT FROM THE LHCb REFEREES

The committee heard a report from the LHCb referees summarising their plans for reviewing the Technical Proposal.

12. REPORT FROM THE ALICE REFEREES

The committee heard a report from the ALICE referees. The ALICE panel on particle identification by time of flight has completed a review of the possible technologies. The physics impact has also been studied by the collaboration, and a decision will be made in the near future. The referees also summarised a recent review of front-end electronics for the different pad gas detectors, which share some common features.

13. PHYSICS WORKSHOPS

G. Altarelli presented the programme of the well-attended and successful workshop on the Theory of LHC Processes held at CERN on 9-13 February. The transparencies are available on the World-Wide Web. He summarised current developments and activities in this field. Particular attention was given to new developments that could suggest novel signatures for some types of new physics. New channels and strategies in the search for relatively light Higgs were explored. The workshop also emphasised theoretical problems whose solution could help to obtain the best return from LHC experiments.

On the suggestion for a workshop on Standard Model Physics, G. Altarelli considered that October 1998 was too early to take full advantage of new work in this area. After discussion with theoretical colleagues he proposed the following approach. A workshop could be held around March 1999 with convenors for particular topics appointed around the end of 1998. These convenors would be asked to report to the Open Session of the LHCC following the workshop. The LHCC agreed to this approach.

14. OTHER BUSINESS

A referee was appointed for the MOEDAL Letter of Intent.

The date of 7-8 May for the next meeting of the LHCC is confirmed.

15. DATES FOR 1998 MEETINGS

7-8 May

9-10 July

3-4 September

22-23 October

The LHCC received the following documents

LHCb Collaboration: Technical Proposal: A Large Hadron Collider Beauty Experiment for Precision Measurements of CP-Violation and Rare Decays (LHCC 98-4/P 4)

MOEDAL Collaboration: Letter of Intent: A Search for Highly Ionizing Particles and Slow Exotic Decays at the LHC Using the MOEDAL Detectors (LHCC 98-5/I 9)



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