CERN/LHCC 95-23

LHCC 16

12 April, 1995

LARGE HADRON COLLIDER COMMITTEE

Minutes of the sixteenth meeting held on Thursday and Friday, 30-31 March 1995

CLOSED SESSION :

Present: J.J.Aubert (Chairman), J.Bernabeu, R.J.Cashmore, L.DiLella, C.Dionisi, P.J.Dornan, P.Duinker, F.Eisele, J.Ellis, L.R.Evans*, L.Foa, U.Goerlach, G.Goggi, A.Golutvin, E.Iarocci*, P.Igo-Kemenes, K.Kajantie, C.Llewellyn Smith*, H.Montgomery, K.Potter, K.Schubert, D.M.Sendall (Secretary), M.Turala, H.Wenninger*, D.O.Williams, G.Wormser.

*) Part time

Apologies: S.Yamada

(F.Bourgeois, J.Harvey and H.Tiecke were present for points 7, 8, 9 and 10.)

1. The minutes of the fifteenth LHCC meeting (LHCC 95-03 / LHCC 15) were approved without amendment.

2. C.Llewellyn Smith gave a brief summary of the current status of negotiations with non-member states on participation in the LHC project.

3. REPORT FROM THE PHYSICS PERFORMANCE REFEREES

The committee heard a preliminary report by the physics performance referees, with a comparison of the discovery potential of ATLAS and CMS in the Higgs sector.

4. REPORT FROM THE ATLAS AND CMS REFEREES

The committee heard preliminary reports by the ATLAS and CMS referees on their ongoing work in reviewing the technical proposals. Meetings have been held with the collaborations and a number of questions formulated. Some of these have been passed to the expert committees of the LHCC for further consideration.

5. REPORT FROM THE COST REVIEW GROUP

W.Bartel presented a preliminary report from CORE. He appreciated the substantial effort that the collaborations have put into establishing the costs documents submitted to CORE in January. CORE has held several meeting with the collaborations and attempted to identify areas of possible concern for further study. A full day cost review is planned with each collaboration before the May meeting.

6. EXPERIMENTAL AREAS

K.Potter presented a status report on experimental areas. The decision to use point 5 rather than point 6 has been confirmed; the reasons for this preference were explained. He reported on feasibility studies at point 5, and on some radiation shielding considerations. Although it is very practical to install CMS there, the same is not true for ATLAS. He announced the formation of a civil engineering task force led by G.Bachy to harmonise all of the LHC construction programme.

7. REPORT FROM THE LDRB

H.Tiecke presented a report on the work of the LDRB. He summarised the organisation of the committee and described a scheme for co-operation with the ATLAS and CMS referees.

On the R&D programme, no status reports have so far been presented. The LDRB has held a preliminary discussion of the new proposal "Tracking detector based on capillaries filled with liquid scintillator" (LHCC 95-7 / P60); this will be discussed further at the next meeting.

The LDRB has discussed the minutes of the last DRDC meeting (DRDC 94-55) and proposed a correction concerning RD-36. This should now read as follows:

"The referee reviewed the status report on this project and summarised results on the two main components, EM calorimeter and pre-shower. In a single year of work the collaboration had achieved detailed results in the areas of tower construction, optimisation of tolerances, energy resolution, reproducibility, B field influence, and interplay with the pre-shower. He appreciated the substantial progress made, even if there were some reservations on the overall construction and on the possible effects of magnetic field on light output.

The Committee congratulated the collaboration on their impressive achievements, and regards the present project as completed for the part concerning the shashlik detector. Responsibility for further studies would be with the CMS collaboration if they should decide to pursue this option. Responsibility for studies of the pre-shower is now transferred to the CMS collaboration. "

The LHCC took note of this change.

8. REPORT FROM THE LERB

F.Bourgeois presented a report on the work of the LERB, including preparations for the Lisbon workshop. He summarised the organisation of the committee and the work begun in co-operation with the ATLAS and CMS referees. The LERB has given a response to one question from the referees on electronics at cryogenic temperatures (LHCC 95-18) and is discussing another concerning large dynamic range systems for calorimetry.

Status Reports of approved projects presented at the open session

RD-29 A mixed analog-digital radiation hard technology for high energy physics applications (LHCC 95-13)

F.Bourgeois gave an overview of the situation on radiation effects and hardening, and summarised the LERB's discussions on the DMILL effort. He reported on their conclusions as presented in LHCC 95-19. RD-29 have fulfilled their milestones and the LERB feel that the activity should continue.

Following the advice of the LERB, the LHCC recommends the continuation of the project for a further year with the following milestones:

- transfer of the process to industry as from the middle of 1995;

- provision of a written document defining responsibilities and commitments during the industrial phase (once the negotiations on second sourcing are over in the weeks to come);

- planning for commercial Multi-Project-Chip MPC runs as from the beginning of 1997.

9. REPORT FROM THE LCRB

J.Harvey presented a report on the work of the LCRB. He summarised the organisation of the committee and the work begun in co-operation with the ATLAS and CMS referees.

Status Reports of approved projects presented at the open session

RD-31 NEBULAS: high performance data driven event building architectures based on asynchronous self-routing packet-switching networks (LHCC 95-14)

J.Harvey gave an overview of the project and its achievements to date, and reported the conclusions of the LCRB. Following the advice of the LCRB, the LHCC recommends the continuation of the project for one year with the following milestones:

- extend the simulation of event building protocols to include congestion control and high-level readout protocols using simulated physics data;

- implement a system to build events from multiple data sources to multiple processor destinations using existing ATM switches.

In addition the LHCC agreed with the following further comments of the LCRB.

- Close collaboration between RD-31 and ATLAS / CMS is encouraged for detailed simulation studies of the baseline designs and to allow reuse of expensive test equipment.

- Little work has been done so far by RD-31 on Fibre Channel, due to shortage of manpower. Concern was expressed that activities in this area were falling outside a common R&D framework.

RD-38 CICERO: control information system concepts based on encapsulated real-time objects (LHCC 95-15)

J.Harvey gave an overview of the project and its achievements to date, and reported the conclusions of the LCRB. Following the advice of the LCRB, the LHCC recommends the continuation of the project for one year with the following milestones:

- provide a revised architectural design of CORTEX including real-time capabilities, priority handling mechanisms and fault tolerance. Demonstrate these capabilities in a small scale prototype;

- provide a realistic demonstration of the high level functionality in the framework of the present prototype;

- provide a detailed evaluation of the impact of the ESA standards and the OMT methodology on the development of the CORTEX project.

In addition the LHCC took note of the following further comments of the LCRB.

- The programme of work presented in the status report (Phase II) was for construction of a large scale pilot control system over a two year period.

- The RD-38 team is encouraged to establish closer contacts with the LHC collaborations to ensure that further developments match experimental requirements.

In consequence, the LHCC strongly emphasised the importance of working closely with the LHC collaborations during the coming year.

10. REPORT FROM THE MAGNET AND ENGINEERING ADVISORY GROUPS

P.Lazeyras presented a report on the work of the Magnet Advisory Group. He summarised progress on the R&D programme launched in 1993. The generic part concerns the stability of aluminium stabilised conductors, and some additional experimental studies. In parallel, industrial R&D has begun on the development of conductors for ATLAS and CMS. Work is continuing on the magnet designs for both collaborations.

P.Lazeyras also reported on the work of the Engineering Advisory Group. The group has heard full presentations by ATLAS and CMS, and is now assessing these.

11. REPORT FROM THE B PHYSICS REFEREES

The committee heard a status report by the B Physics referees. The LHC-B collaboration has made progress on a baseline design for a new LoI, and is working on various aspects of the trigger. The collaboration expects to submit an LoI by 10 June 1995.

12. REPORT FROM THE ALICE REFEREES

The ALICE referees gave a brief status report on colour screening. A report from ALICE is expected by 24 April, and an open presentation will be made to the LHCC in May.

The referees also discussed the paper LHCC 95-01. In this document the ALICE collaboration outlines a wide programme on pp physics which is at present not covered by the other two experiments: soft and semihard processes, rapidity gaps and p-ion collisions.

The LHCC recognises such an experimental programme as a valuable extension of the LHC physics programme.

However, for the time being the LHCC takes note of this document and stresses the fact that ALICE should concentrate on being successful in their heavy ion programme.

13. TIMETABLE AND ORGANISATION

The committee held a preliminary discussion of the reviewing process for the technical proposals. The format of the May meeting of the LHCC was agreed: part of it will be held jointly with the LCRB, LDRB and LERB.

The following referees were nominated for the "BEAM-DUMP" Expression of Interest (LHCC 95-17 and LHCC 95-22):

P.J.Dornan, U.Goerlach, P.Igo-Kemenes, K.Kajantie

14. DATES FOR 1995 MEETINGS

16-19 May

6-7 July

13-14 September

16-17 November

The LHCC received the following documents

o R&D Proposal: "Tracking detector based on capillaries filled with liquid scintillator" (LHCC 95-7 / P60)

o RD29 Collaboration: LERB Status Report (LHCC 95-13)

o RD31 Collaboration: LCRB Status Report (LHCC 95-14)

o RD38 Collaboration: LCRB Status Report (LHCC 95-15)

o J.Kirkby et al.: Expression of Interest for a BEAM-DUMP upgrade of L3 for the LHC (LHCC 95-17)

o LERB: Electronics at cryogenic temperatures (LHCC 95-18)

o LERB: Report on the assessment of the RD29/DMILL effort (LHCC 95-19)

o J. Kirkby et al.: Addendum to Expression of Interest LHCC 95-17 (LHCC 95-22)