CERN/LHCC 96-11

LHCC 21

7 February, 1996

LARGE HADRON COLLIDER COMMITTEE

Minutes of the twenty-first meeting held on Thursday and Friday,
1-2 February 1996

OPEN SESSION :

1. Status of the LHC project (C.Llewellyn Smith)

The Director General summarised progress on the machine design. The design review has been completed and published, and favourably reviewed by the machine advisory committee: it will form the basis of the full technical design.

The Director General announced that following discussions of the LHCC recommendations by the Research Board he had formally approved ATLAS and CMS, and had written to the collaborations setting out the detailed conditions of approval.

The Director General also summarised progress in discussions with non-member states.

2. Presentation of ALICE Technical Proposal (LHCC 95-71/P3; J.Schukraft, L.Riccati, R.Stock, W.Klempt)

CLOSED SESSION :

Present: J.Bernabeu, R.J.Cashmore, L.DiLella, C.Dionisi, P.J.Dornan, J.Ellis, J.Engelen, L.R.Evans*, L.Foa, U.Goerlach, A.Golutvin, G.Goggi, D.Hartill, E.Iarocci (Chairman), P.Igo-Kemenes, P.Levefre* (representing L.Evans), C.Llewellyn Smith*, N.McCubbin, H.Montgomery, K.Nishikawa, K.Potter, A.Schopper, A.Schwarz, D.M.Sendall (Secretary), M.Spiro, M.Turala, D.O.Williams, G.Wormser.

*) Part time

Apologies: H.Wenninger

(J.May was present for point 3).

1. The Chairman welcomed Y.Nishikawa as a new member of the LHCC. The minutes of the twentieth LHCC meeting (LHCC 95-75 / LHCC 20 rev) were approved without amendment.

2. C.Llewellyn Smith gave further details of the status of negotiations with non-member states.

3. R&D PLANS OF LHC-B

T.Nakada gave a report on R&D for the different LHC-B detector subsystems. He emphasised that the HERA-B experiment would be an important source of technical input for LHC-B. Critical items for demonstrating feasibility were identified, including the RICHs, trigger, and radiation hardness of the calorimeters. An R&D programme with milestones was outlined.

4. REPORT FROM THE LHC-B REFEREES

The committee heard a report from the LHC-B referees.

5. DISCUSSION OF LHC-B

The committee discussed the status and plans of LHC-B in the light of the referees' reports. As a result of these discussions, the committee agreed on recommendations to be sent to the Director General for consideration by the Research Board. A copy of these recommendations is attached to the minutes.

6. DISCUSSION OF LHCC REVIEWING PROCEDURES

The Chairman drew attention to the need for some revision of the LHCC's reviewing procedures and advisory bodies, particularly in the light of the approval of ATLAS and CMS.

The LHCC endorsed a proposal presented by the Chairman. This had been elaborated with the CERN management and the referees; it had also been discussed with the collaborations and with the chairmen of the LCRB, LDRB and LERB.

It involves the creation of a new body, the LHCC Consultants Group (LCG), as a standing panel of experts available to work with the referees on specified topics. The LDRB will be dissolved, and the tasks of the existing LCRB and LERB modified by dropping their review activity. They will be succeeded by the LCB and LEB, composed of members from the experiments, CERN management and external members, with chairmen appointed from outside. They will meet periodically to identify and monitor the development of common technologies of the LHC experiments.

7. REPORT FROM THE ALICE REFEREES

The committee heard a first report from the ALICE referees on the Technical Proposal. A number of questions would be addressed further with the collaboration, including particle identification, the TPC, and the status of the muon arm Technical Proposal.

8. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees, including a review of major milestones for electromagnetic and hadron calorimetry and tracking at the end of 1995.

9. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees, including the status of recent milestones for detector integration and envelopes, and for different subsystems.

10. REPORT FROM THE LERB

Status reports have been submitted by RD2, RD19, RD20 and RD27.

Status Reports of approved projects presented at the open session

RD-2: Proposal to study a tracking/preshower detector for the LHC (LHCC 96-5)

RD-20: Development of high resolution silicon strip detectors for experiments at high luminosity at the LHC (LHCC 96-2).

RD2 and RD20 have submitted their final status reports, which were reviewed by the LERB. F.Bourgeois gave an overview of the projects, which were now considered to be terminated.

RD-19: Development of hybrid and monolithic Si micropattern detectors (LHCC 96-3).

F.Bourgeois gave an overview of the project, which had accomplished substantial development work during 1995.

The LERB recommends a continuation of RD19 for one more year with the following main milestones:

- Develop a design for a pixel detector which is suitable for an LHC experiment.

- Take specific steps to make the design compatible with an identified radiation-hard process appropriate for the LHC so that reliability goals can be met.

- Complete last year's milestones by building and evaluating the Omega3/LHC pixel telescope.

- Continue to develop its expertise within the fields of circuit design, bump bonding and MCM technology for application in the design of pixel detectors.

The LHCC endorsed these conclusions.

RD-27: First-level trigger systems for LHC experiments (LHCC 96-4).

F.Bourgeois gave an overview of the project, which has proved to be a fruitful forum for information exchange and co-operation between the Level-1 trigger designers of ATLAS and CMS. The collaboration is now in the second phase of its programme, where sizeable demonstrators will be assembled and tested in the lab and test beams.

The LERB recommends continuation of the project for an additional year to complete the on-going work and manage the takeover by the LHC collaborations. The following milestones were proposed:

- Test and validation of very high speed (>=800 Mbit/s) synchronous serial data links, including the serial receiver circuit developed in the collaboration.

- Test of high speed (>=160 Mbit/s) custom backplanes based on BTL and differential ECL signals, to prove the feasibility of compact point to point subsystem interconnects at the required speed.

- Construction and test of a Central Trigger Processor based on FPGAs, to demonstrate the use of FPGA technology in a fast, synchronous, high density design.

The LHCC endorsed these conclusions.

F.Bourgeois announced the second workshop on electronics for LHC experiments, to be held at Balatonfured on 23-27 September 1996.

11. REPORT FROM THE LCRB

Proposal presented at a previous meeting

P-61: High energy physics processing using commodity components (LHCC 95-46/P61 and LHCC 96-8)

J.Harvey reviewed the goals and motivation of the project, noting that very few resources had been requested. The LCRB had received an addendum to the proposal (LHCC 96-8), as requested at the previous meeting. The LCRB felt that this now provided a full programme of work for the first year.

Following the advice of the LCRB, the LHCC recommends the approval of the project for one year with the following milestones:

- On prototype commodity processor farms, study the suitability of Windows NT to support installation, remote management, remote disk and tape access and task to task from nodes to the server. Evaluate its performance, recovery capabilities and stability.

- Study the software development environments supported by Windows NT and evaluate the ability of Windows NT to run LHC simulation and reconstruction codes.

J.Harvey also announced the organisation of a workshop to be held at Padova on 11-13 June 1996. The aim was to prepare the ground for the Computing Technical Proposal, expected in December 1996.

12. TEST BEAMS

A.Schopper presented the first version of the 1996 SPS Fixed Target Schedule, which had been discussed and accepted in the last SPSLC meeting. He also showed the internal schedules of ALICE, ATLAS and CMS. He outlined the prospects for the future and some of the problems that could be expected.

13. OTHER BUSINESS

J.Ellis will move from the LHC-B referee team to the ALICE referee team.

J.Ellis reported on discussions with ATLAS and CMS on the proposed SUSY workshop, and outlined the possible format and programme of a one-day workshop. It was agreed to hold such an informal open workshop on 30 October 1996. Interest was expressed in the idea of yearly workshops of this kind on different physics topics.

The Chairman has received a memorandum from B.de Raad, requesting that a safety chapter be included in each of the subsystem Technical Design Reports of the collaborations.

14. DATES FOR 1996 MEETINGS

28-29 March

30-31 May

4-5 July

29-30 August

31 October - 1 November