CERN/LHCC 97-28

LHCC 27

24 March, 1997

LARGE HADRON COLLIDER COMMITTEE

Minutes of the twenty-seventh meeting held on Thursday and Friday,
13 and 14 March 1997

CLOSED SESSION :

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

*) Part time

Apologies: C.Dionisi, L.R.Evans, K.Nishikawa

(S.Wolbers was present for point 6; R.Forte, F.Harris, J.Hilke and U.Straumann were present for point 8).

1. The Chairman welcomed G.Altarelli who is attending for the first time. He expressed his thanks to J.Ellis, who is retiring, for his valuable contributions to the work of the LHCC. The minutes of the twenty-sixth LHCC meeting (LHCC 97-11 / LHCC 26) were approved with the following amendment: add J.May to the list of those present.

2. C.Llewellyn Smith summarised the current status of discussions with non-member states concerning contributions to the LHC project.

3. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees, including their review of the Calorimetry Technical Design Report (LHCC 96-40, 96-41, 96-42), completed with the collaboration of M.Calvetti and J.Strait as consultants.

4. REPORT FROM THE COST REVIEW GROUP

W.Bartel reported on the work of evaluating the ATLAS calorimetry cost estimates. CORE has considered the ATLAS cost planning document (LHCC 97-25), and has met with the collaboration to discuss it. The overall cost ceiling has been respected, even though some changes have been made in the estimates for some subsystems. The collaboration assumes cost ceilings for each major component. The calorimeter costing is now largely based on industrial offers and/or prices achieved for prototypes, so uncertainties have decreased relative to earlier estimates. CORE has made a study with ATLAS of the impact of the calorimeter on infrastructure costs.

The CORE report indicates that the cost estimate for the calorimetry is reasonable and fits within the overall envelope of the ATLAS cost estimate: the LHCC endorses this evaluation.

5. ATLAS CALORIMETRY TECHNICAL DESIGN REPORT

The LHCC has completed its scientific, technical and cost review of the ATLAS Calorimetry TDR submitted in December, 1996. 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. In particular, the electromagnetic calorimeter performance matches these goals. However, currently its performance is limited by the amount of material in front of the calorimeter. This material is primarily associated with the Inner Detector and services. The LHCC considers this critical and will monitor the situation closely as it evolves.

There are a few technical issues in well defined areas to which ATLAS should pay attention. These are detailed in an ancillary document (LHCC 97-27) 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 the ATLAS practice of conducting independent reviews of the Engineering Designs should include all aspects of the system, and not just those which are Common Projects. The written reports of these reviews should be made available to the LHCC through its referees.

The LHCC considers that a review of the integrated engineering of the experiment will be needed, well in advance of the installation of the experiment.

Recommendation

The LHCC recommends general approval of the ATLAS Calorimetry Technical Design Report describing design, performance, construction, and installation in 2004. The review identified some concerns in limited areas, which require resolution (LHCC 97-27). The LHCC considers that the schedules and milestones given in the TDR are reasonable, and these will be used by the committee to measure and regulate the future progress of the project.

6. REPORT ON THE ATLAS AND CMS COMPUTING TECHNICAL PROPOSALS

M.Kasemann reported on the work of reviewing the ATLAS and CMS computing Technical Proposals (LHCC 96-43, LHCC 96-45). He presented the list of questions submitted by the referees and consultants. Further discussions have been held with the collaborations, who have agreed on a timescale for addressing the questions. A written report will be prepared for presentation at the closed session of the 5-6 June meeting of the LHCC.

7. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees, including current work on MSGCs.

8. REPORT ON R&D FOR LHC-B

T.Nakada gave a status report on LHC-B, covering detector geometry optimisation, RICH status, and research and development activities for the trigger and data acquisition system (LHCC 97-14).

9. REPORT FROM THE LHC-B REFEREES

The committee heard a report from the LHC-B referees, concentrating on the status of R&D activities as outlined in the two documents LHCC 96-1 and LHCC 97-14. The LHCC is pleased to note the substantial progress made.

10. DISCUSSION OF LHC-B

The LHCC had extensive discussions of the status of LHC-B in the light of the referees' report.

The LHCC recommends that the LHC-B collaboration should proceed with the preparation of a Technical Proposal for the LHC-B detector. The Technical Proposal should specifically include reports of the successful completion of the following R&D milestones for both the RICH and Trigger/Data Acquisition systems.

RICH

1. Complete simulation of the expected detector performance including a demonstration of effective pattern recognition.

2. Successful completion of a beam test of a prototype detector incorporating commercially available pixel Hybrid Photon Detectors (HPDs), and a measurement of the Cerenkov angular resolution of the proposed optical and radiator system.

3. Production of a suitable HPD with the required specifications adequate for the final detector.

Trigger / Data Acquisition system

1. Definition of a global trigger strategy based on a complete LHC-B detector simulation.

2. Specification of the detailed requirements of the front end electronics that are compatible with the proposed trigger requirements.

3. Definition of a baseline solution for the LHC-B Trigger/DAQ system.

11. REPORT FROM THE LHCC ELECTRONICS BOARD

P.Sharp reported on the work of the LEB, covering a number of topics discussed at their last two meetings.

Radiation-hard technology: RD9 has produced a final status report (LHCC 97-1). The LEB thanks the RD9 collaboration for their thorough analysis of the SOI-CMOS technology. However, further work with this process is not possible as commercial production has ceased.

RD29 (DMILL mixed analog-digital technology) has submitted a status report (LHCC 97-15). The project is now almost complete and a final report is expected before the end of 1997. The LEB considers this an excellent project which has achieved very successful results. The LHC programme thus now has access to two radiation-hard processes.

Radiation-tolerant technology: the LEB is concerned that this problem be addressed quickly. The LEB has reviewed the proposal P63 to study radiation-tolerant technology (LHCC 97-2). On request of the LEB, the collaboration submitted an addendum focussing on limited objectives (LHCC 97-24). Following the advice of the LEB, the LHCC recommends approval of the project until the end of 1997 with the following milestones:

- Complete the assessment of the radiation tolerance of 0.5 micrometer CMOS processes using specifically designed radiation tolerant test structures, and the evaluation of prototype chips for the ALICE pixel and TPC readout.

- Complete a preliminary study of the radiation tolerance of 0.35 and 0.25 micrometer CMOS test structures

- Obtain access to space (ESA) databases of radiation tolerant components.

The LHCC notes that this is a first step in a programme to study the issues associated with operating electronic equipment in the radiation environment of the experimental caverns.

Quality management systems: the LEB considers this a high priority issue. The LHCC proposes to invite S.Quinton to make a presentation on this topic at a closed session of the LHCC.

12. REPORT ON LHC EXPERIMENT MAGNETS

T.Taylor reported that ALICE has considered the relative merits of superconducting and resistive dipole magnets for the muon arm. The collaboration has now decided on a resistive magnet on several grounds, including cost. The Magnet Advisory Group supports this choice.

T.Taylor also reported recent progress on the ATLAS and CMS magnets, in particular work on the conductors. A timescale for submission of the Technical Design Reports has been established. These will be reviewed by the MAG, whose membership is being revised.

13. REPORT FROM THE RD42 REFEREES

The committee heard a report from the ATLAS and CMS referees on RD42 (Diamond tracking detectors). Following the status report (LHCC 97-3) they had held discussions with the collaboration and with ATLAS and CMS. The referees note the substantial progress made, and have established milestones for a further year of work as follows:

- achieve 200 micrometer collection distance on a thin substrate (< 1mm) and perform irradiation measurements;

- obtain a price estimate from industry.

The LHCC agrees to the continuation of the project for a further year on this basis.

14. TEST BEAMS

E.Tsesmelis presented the updated schedules for the SPS and the PS East Hall. New requests have been allocated and the Gamma Irradiation Facility programme has been agreed. Some free time is still available in SPS and PS lines.

15. DATES FOR 1997 MEETINGS

5 - 6 June

10 - 11 July

4 - 5 September

5 - 6 November (nb. Wednesday and Thursday)

The LHCC received the following documents

o RD45 Collaboration: LCB Status Report / RD45 (LHCC 97-6)

o RD45 Collaboration: Object databases and their impact on storage-related aspects of HEP computing (LHCC 97-7)

o RD45 Collaboration: Object database features and HEP data management (LHCC 97-8)

o LHC-B Collaboration: Trigger and Data Acquisition System for the LHC-B Experiment; Current Status and Work Programme (LHCC 97-14)

o RD29 Collaboration: LEB Status Report / RD29 (LHCC 97-15)

o RADTOL Collaboration: Addendum to P63 (LHCC 97-24 P63 Add.1/LEB)

o ATLAS Collaboration: Cost Planning version 6 (LHCC 97-25) *

o CMS Collaboration: Cost Planning version 8 (LHCC 97-26) *

o ATLAS referees: Review of ATLAS Calorimetry Technical Design Report (LHCC 97-27) *

* 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