LARGE HADRON COLLIDER COMMITTEE

Minutes of the thirty-ninth meeting held on Thursday and Friday,

25-26 March 1999

OPEN SESSION :

1. TOTEM Proposal (LHCC 99-07): G. Matthiae

2. MOEDAL Letter of Intent (LHCC 98-05): J. Pinfold

3. ATLAS Technical Co-ordination Technical Design Report (LHCC 99-01): F. Butin, M. Hatch, B. Nicquevert

4. ALICE PHOS Technical Design Report (LHCC 99-04): V. Manko

5. ALICE ZDC Technical Design Report (LHCC 99-05): M. Gallio

CLOSED SESSION :

Present: B. Adeva*, G. Altarelli*, R. Bell*, J. Carr, R. Cashmore, M. Delfino, J. Engelen (Chairman), A. Ereditato, B. Foster, U. Heinz*, M. Kasemann, R. Kephart*, H. Kolanoski, J. Lee-Franzini, B. Löhr*, L. Maiani*, J. May*, M. Mazzucato, K. Potter, M. Price* (representing G. Goggi), G. Rolandi, A. Rostovtsev, P. Roudeau, T. Ruf, H. Schellman, D. M. Sendall (Secretary), P. Sharp*, R. Voss* (representing G. Goggi), G. Zech.

Apologies: L. R. Evans, S. Komamiya, A. Read, H. Wenninger.
 

1. The Chairman welcomed the new consultants, and announced that H. Schellman has joined the TOTEM referee team.

The minutes of the thirty-eighth LHCC meeting (LHCC 99-6 / LHCC 38) were approved without amendment.

2. The Director General gave a brief report on the status of the LHC project. He reported steady progress on the machine, with no delays foreseen. Offers for the first phase of the dipoles will be adjudicated in June. He also summarised current efforts to find more resources in non-member states. R. Cashmore reported on Russian contributions, where the situation has improved since last year.

3. REPORT FROM ALICE

J. Schukraft gave a brief report covering the status of the collaboration, advances in R&D, and recent major decisions. In the TOF system Parallel Plate Chambers will be replaced by Resistive Plate Chambers, offering significant gains in performance and safety. In view of current understanding of the importance of electron identification, ALICE is proposing an upgrade consisting of a large-area Transition Radiation Detector. Possible funding scenarios were described for this. An addendum to the ALICE Technical Proposal is in preparation and will be submitted to the LHCC at the end of April.

P. Braun-Munzinger explained the motivation for the TRD in terms of di-electron physics. It should permit observations on charmonia, open charm and open beauty, w and j detection, and studies of the thermal continuum. He presented simulation results for the expected performance, and the mechanical construction of the chamber. A trigger based on the TRD was also described.

4. REPORT FROM THE ALICE REFEREES

The committee heard a report from the ALICE referees, concentrating on preliminary reactions to the Technical Design Reports for the PHOS and ZDC detectors. For both detectors, the referees have held discussions with the collaboration, which has already answered a first list of questions. Following further questions and discussions, the referees will make a full report at the next meeting of the LHCC.

5. REPORT FROM THE ATLAS REFEREES

The committee heard a report from the ATLAS referees. The collaboration's approach to monitoring milestones was presented, together with the current status of the various milestones relative to the TDRs. The full set of revised Level-1 milestones will be available for the May meeting of the LHCC: these are intended to supersede the milestones in the ancillary documents of the LHCC recommendations for the TDRs. The LHCC noted that an agreed set of updated milestones will be needed for their July meeting, to give a good understanding of critical paths and items, and to measure and regulate the future progress of the project.

The referees have carried out a review of the Technical Co-ordination TDR with R. Bell and B. Löhr as consultants. They are favourably impressed by the quality of the work presented, and congratulate the collaboration. The review identified some concerns in limited areas, and the LHCC plans a final discussion of the TDR at their May meeting.

The referees also reported on the status of the muon instrumentation, covering integration, schedules and milestones, and the status of the various chamber types. The Monitored Drift Tubes present a particular challenge in view of their high accuracy, the size of the system, and the number of production facilities involved. Encouraging progress was reported on solving these problems.

ATLAS has carried out a substantial review of their computing strategy and effort. The recommendations propose some changes of organisation and emphasis, which will be reviewed by the referees after some time has elapsed for them to take effect.

6. REPORT FROM THE TOTEM REFEREES

The committee heard a report from the TOTEM referees, giving preliminary reactions to the Proposal. The review covered the physics programme, integration with the machine and integration with CMS. No major problems were noted, although some clarification of proposed running scenarios will be needed. However, physics goals beyond the total cross-section measurements, particularly in conjunction with CMS, merit further discussion. The referees will make a full report at the next meeting of the LHCC.

7. REPORT FROM THE MOEDAL REFEREE

The committee heard a report from the MOEDAL referee, giving preliminary reactions to the Letter of Intent. MOEDAL is able to unambiguously identify monopoles or dyons. The plastic foils should be capable of operating in the LHCb environment, although further studies are encouraged. The referee will make a full report at the next meeting of the LHCC.

8. REPORT FROM THE CMS REFEREES

The committee heard a report from the CMS referees. The milestone reporting procedures were reviewed, together with the current status of the various milestones relative to the TDRs. The LHCC noted that an agreed set of updated milestones will be needed for their July meeting, to give a good understanding of critical paths and items, and to measure and regulate the future progress of the project.

The referees also reported on their tracker review meeting with the collaboration, with U. Straumann as consultant. They noted impressive progress, although the concerns expressed at time of the TDR approval still remain, along with the question of radiation-hard front-end electronics. Several MSGC technologies are under study in addition to the baseline solution: the referees plan to review the situation regularly.

9 . REPORT FROM THE MAGNET ADVISORY GROUP

T. Taylor presented a report from the MAG review meeting in February. A written report will be available shortly. The big magnet projects of ATLAS and CMS are proceeding reasonably well, although the overall planning schedule is very tight.

For the CMS solenoid the MAG is fully satisfied with progress on the yoke and end caps. For the conductor and winding, there is substantial progress, although the continuous welding process has still to be demonstrated. For low-cost critical items of ancillary equipment, the MAG noted that purchase might be more desirable than in-kind contribution.

For ATLAS, it was noted that in-kind contributions constitute a large fraction of the project resources. The MAG is pleased to note that the racetrack coil tests have been satisfactorily completed. The MAG congratulates the collaboration on the substantial progress made on the conductor. Progress on the B0 programme and plans for the barrel toroid procurement were noted: maximum effort will be needed to complete the barrel toroid engineering on time. The end-cap toroids and inner solenoid appear sound, and are on schedule.

For ALICE, the MAG confirms its approval of a resistive dipole magnet. Although this is a large magnet, no fundamental difficulties are foreseen.

For the LHCb superconducting dipole, alternatives to the baseline concept of the Technical Proposal are under consideration. The MAG encourages the collaboration to follow up their studies of a conventional aluminium-stabilised superconductor. A racetrack coil configuration is also under study: a choice is expected by May 1999.

10. REPORT FROM THE LHCb REFEREES

The committee heard a report from the LHCb referees following their recent overall review of the experiment: the next full review is planned for October. Good progress on many fronts was noted, and there is no indication of delay in major milestones or TDR submissions. The referees have requested an integrated summary of planning and major milestones for the whole experiment.

Tests on the vertex detector have shown that the baseline design is adequate for the physics, but improvements are under investigation. Optimisation studies are under way for the calorimeter. For the muon system a new filter geometry is under study, based on re-use of the iron blocks from the West Area Neutrino Facility. Beam tests were made on Double and Multigap Resistive Plate Chambers, Thin Gap Chambers and Cathode Pad Chambers with encouraging results. A choice of technology for the muon chambers is expected in January 2000.

Good progress was reported on technologies for the RICH photodetectors, and a decision is expected by October 1999. For the outer tracker a prototype of the straw-tube type is expected by end 1999 with a decision by January 2000. For the inner tracker four technologies are under intensive study, and test-beam results should be available for the July meeting of the LHCC, when the situation will be reviewed.

The referees also reported progress on trigger and data-acquisition, which is a considerable challenge. Work is under way on assessing various DAQ architectures. The approach to timing and to slow controls were outlined. Substantial progress was noted on software architecture and design.

11. REPORT FROM THE LHCC ELECTRONICS BOARD

P. Sharp reported on the work of the LEB, covering a number of topics discussed at four recent meetings: further details can be found in the LEB minutes. The LEB reviewed the RD12 project, of which Timing, Trigger and Control is the only remaining activity. Very good progress was noted, well integrated with the requirements of the four LHC experiments. the LEB recommends that work should continue, but evolve into a common project since the R&D component is now small.

The LEB reviewed the final status report of the RD29 project. The DMILL process development is complete and the process signed off for production. This very successful project is now finished, and the LEB congratulates the collaboration on their achievements.

The LEB reviewed the RD48 project (ROSE) on radiation-hard silicon. This is a large and active collaboration, and has made good progress: the LEB encourages the project to focus on the needs of LHC experiments. Good results have been achieved with oxygen diffusion, now adopted by several manufacturers. The LEB has set a milestone for evaluating this process in a realistic environment with a report in September 1999.

The LEB reviewed the RD49 project on radiation-tolerant electronics. This is an important issue for the LHC caverns. Studies of .25 micron technology are very positive, and the LEB recommends continuation of this work for a further year. In addition the LEB encourages the preparation of a common project proposal on design support for the use of .25 micron technology by the HEP community. A complementary activity concerns radiation-hard COTS (Common Off The Shelf) components. A project proposal to co-ordinate their selection, evaluation and procurement has been submitted. The LEB recommends approval of this project.

The LHCC endorsed the conclusions on the R&D projects, and agrees that commitment of appropriate resources by the collaborations is essential to the success of common projects.

The LEB has also discussed the safety of materials in LHC electronics, and encourages a system approach which minimises the overall risk. The Rome workshop on electronics for LHC experiments was very successful, and the next is planned for Snowmass on 20-24 September 1999.

12. REPORT FROM THE LHCC COMPUTING BOARD

M. Mazzucato reported on the work of the LCB, covering a number of topics discussed at two recent meetings: further details can be found in the LCB minutes. The LCB reviewed the project on videoconferencing support. A PEP (Project Execution Plan) has been submitted for phase 2, to consolidate the achievements of phase 1 and introduce a service. The LCB recommends approval, with a final report in Summer 2000.

M. Mazzucato outlined the goals and organisation of two new common projects whose PEPs have been reviewed by the LCB. For MONARC (Models Of Networked Analysis at Regional Centres) a good start has been made, and the LCB recommends approval with a final report for this phase at the end of 1999. For EFF (Event Filter Farms), the LCB recommends approval on the basis of the schedule for the first year.

The LCB discussed SPIDER (Software Process Improvement for Documentation Engineering and Re-use) which covers a broad range of activities. A PEP for a Software Release Tool will be a first concrete step to achieving the goals of the project, and work is under way on defining this. Work on coding conventions is also well advanced.

The LCB reviewed the status of the LHC++ project (the object-oriented equivalent of CERNLIB). Major progress has been made, and there is a plan to establish an LHC++ executive board including representatives of ATLAS, CMS and LHCb.

The LCB reviewed the final status report of the PIE project (a database of Persons Institutes and Experiments for the LHC collaborations). The tasks of the project have now been achieved, and the LCB congratulates the team on its achievements. Future progress will be reviewed by a User Committee.

The LCB reviewed the final referees report on RD44, whose goal was an object-oriented detector simulation toolkit. This task has been accomplished by a production version released at the end of 1998. The LCB congratulates the team on its achievements, and considers the project to be an example of how world-wide distributed software production can be managed. The effort has been taken over by the GEANT4 collaboration. The LHCC endorsed this conclusion.

The next LCB workshop will be held in Marseilles from 28 September to 1 October 1999. The main topic will be the architecture of data processing systems.

13. TEST BEAMS

T. Ruf presented the updated SPS and PS fixed-target schedules. The preferred period for the 25 nsec test beam of about 12 days is at the beginning of May 2000, which would satisfy ATLAS and CMS.

The Chairman expressed his warm thanks to E. Tsesmelis, the retiring SPS co-ordinator, for his valuable contribution to the work of the LHCC.

14. OTHER BUSINESS

The Chairman has received a letter from F. Ruggieri, the Chairman of the HEP-CCC, drawing the attention of the LHCC to the importance of defining a policy for the "Y2K problem" (or millenium bug). Procedures are in place at CERN to review this issue, and a reminder will be sent to the spokesmen of the LHC experiments.

15. DATES FOR 1999 MEETINGS

27 - 28 May (Thur - Fri)

7 - 8 July (Wed - Thur)

2 - 3 September (Thur - Fri)

20 - 21 October (Wed - Thur)

The LHCC received the following documents

ATLAS Collaboration: Technical Co-ordination Technical Design Report
(LHCC 99-01 / TDR 13)

ALICE Collaboration: Photon Spectrometer Technical Design Report
(LHCC 99-04 / TDR 2)

ALICE Collaboration: Zero-Degree Calorimeter Technical Design Report
(LHCC 99-05 / TDR 3)

TOTEM Collaboration: Proposal: Total Cross-Section, Elastic Scattering and Diffraction Dissociation at the LHC (LHCC 99-07 / P 5)

RD49 Collaboration: Status Report LEB / RD49 (LHCC 99-08)

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