CERN/LHCC 2002-044
LHCC 61
2 December 2002  
LARGE HADRON COLLIDER COMMITTEE

Minutes of the sixty-first meeting held on

 Wednesday and Thursday, 27-28 November 2002



 

CLOSED SESSION:

S. Bertolucci, K. Borras, M. Calvetti (Chairman), R. Cashmore, D. Cassel, A. Ceccucci,
J. Dainton*, F. Ferroni,  J.-J. Gomez-Cadenas, M. Hauschild, M. Jaffre, Y. Karyotakis, Y.-K. Kim, B. Löhr, M. Mangano, J. Martin, J. Nash, J. Panman, K. Potter,
W. von Rueden, D. Schlatter, P. Seyboth, H. Tiecke, K. Tokushuku, E. Tsesmelis (Secretary), C. Vallée                                          
                                                                                           *) part time

Apologies:   P. McBride


1.   PROCEDURE
    The minutes of the sixtieth LHCC meeting (LHCC 2002-036 / LHCC 60) were approved with the following modification: in point 12 (report from the LHCb referees), the last paragraph should be omitted.

    The report from the CMS Comprehensive Review (LHCC 2002-037 / LHCC-G-016) was approved without modification.

    A change in the procedure for publishing the LHCC minutes was agreed to. Following approval of the minutes by the Chairman and Director for Collider Programmes, the minutes will be sent to the members of the LHCC by electronic mail. Any corrections would have to be sent to the Secretary within a few days. The minutes, carrying the mention "Draft", would then be posted on the Web. Upon approval of the minutes at the following LHCC, the mention "Draft" would be removed from the Web version.
     
     

     2.  INTRODUCTION     3.   REPORT FROM THE LHCb REFEREES     4.   REPORT FROM THE ATLAS REFEREES      5.  REPORT FROM THE ALICE REFEREES The LHCC heard a report from the ALICE referees, concentrating on the status of the sub-detectors and in particular the Forward Detectors, the Muon Spectrometer and the TRD, as well as the installation scheme and the Physics Performance Report.

Good progress was reported on the Forward Detectors — the V0 (to measure the interaction and centrality triggers and beam-gas collisions), the T0 (to provide the fast pre-trigger and time reference for the TOF detector) and the Si-Forward Multiplicity Detector (FMD; to measure the multiplicity and dn / dh ). The boundaries between the detectors are now defined and the Forward Detectors are now a well-defined project within ALICE. Submission of the TDR to the LHCC is scheduled for mid-2003.

Data from beam tests of the new cell prototype for the PMD are being analysed. The Addendum to the PMD TDR will be submitted in March 2003.

The LHCC took note of the new list of milestones. Delays have been identified particular in the ITS, whose schedule is now becoming critical. Good progress was reported on clarifying the interference between the detector milestones, the installation schedule and the beam tests. The first LHCC Installation Review of ALICE is scheduled for March 2003 and will aid to identify the milestones that are on the critical path. A complete list of detector milestones, including all `Ready for Installation’ dates, will be submitted to the LHCC after the Installation Review.

The LHCC took note of the preparations for the ALICE Physics Performance Report. Continuing efforts to improve the reconstruction techniques are yielding encouraging results. The Report will be submitted in two volumes, with the first to be submitted in the spring of 2003 and the second in the autumn of 2003.

The referees also reported on the TRD. The overall TRD schedule is driven by the need to complete at least two supermodules for installation below the beampipe by August 2005. The LHCC considers that the delays in the individual sub-projects, particularly in the chamber production and digital chip, still allow the above schedule to be met. Analysis of the test beam data is underway and the preliminary results are considered to be promising. The requests from the LHCC were incorporated in the tests.

Good progress was reported on the Muon Spectrometer. Several of the outstanding issues were solved in 2002, including completion of the absorber design, minimization of the impact in the magnet delay, evaluation of the RPC detector performance and progress in the Geometry Monitoring System and Trigger. However, preliminary results from beam tests on the tracking chambers of Stations 1 and 2 indicate a gain inhomogeneity across a quadrant of the chambers. Analysis is continuing to understand the problem but a delay in the Production Readiness Review is thus to be expected.

Finally, the LHCC will continue monitoring the construction schedule and milestones for the TOF detector.
 

    6.   REPORT FROM THE CMS REFEREES The Committee heard a report from the CMS referees, concentrating on the status of the Tracker, the Muon System, the ECAL and issues on the schedule and cost-to-completion.

The LHCC endorsed the proposed reporting procedure for the CMS milestones. The Committee also took note that the CMS Commissioning Task Force has started working towards the follow-up LHCC Installation Review in March 2003.

The referees also reported on the cost-to-completion. The shortfall of 63 MCHF is the difference between the new estimated cost of 513 MCHF and the MoU funding of 450 MCHF. CMS has made good progress to obtain funds to cover the shortfall and currently have firm pledges for 50 MCHF. Staging the CMS detector is required to cover the outstanding 13 MCHF and detector elements not installed by April 2007 will be part of the upgrade for high luminosities.

The referees reported on the Tracker. The production logistics have been set up and tested at all sites. However, with only 60 modules having been produced so far, the LHCC considers that it is still too early to gauge the overall rate of production. Conclusions on the rate should await production ramping-up in the summer 2003. Progress was shown for the Hybrid front-end electronics. Tests on the Full-Flex Hybrid solution are underway. The design needs to completed by January 2003. Moreover, good progress was reported for the silicon sensors, the carbon fibre frames and the kapton bias insulators, although a production problem was detected in the pre-series of the Pitch Adapters. Given the tight schedule, the LHCC will continue monitoring closely developments in the Tracker.

The LHCC noted the delays in the production of the DT chambers and the associated MINICRATE read-out electronics. As requested by the LHCC, CMS submitted the production and installation plan for the DT chambers and for the MINICRATEs. The Committee is reviewing this plan and will use it to monitor the project in the future. About 60 chambers are expected to be available by the end of 2002, while electronics boards of all types will be available for about 40 MINICRATES by September 2003 in order to start the mass assembly. The chamber production site at Torino will commence operation in April 2003.

The LHCC also noted the production and installation plan for the Barrel RPCs. Ageing tests at the GIF are continuing and the target 0.03 C/cm2 accumulated charge will be reached in May 2003. The Engineering Design Review committee for the Endcap RPCs approved procurement of the bakelite and gaps for the region |h |£ 1.6 and decided to oil the forward RPC gaps in the same pseudorapidity range. Further detailing of the Endcap RPC production as well as the funding needs to be elaborated.

The referees also reported on the status of the ECAL. Growing large crystal ingots is now the standard process but the cutting procedure has not yet reached the required yield and further optimization is needed. However, delivery of crystals for the Barrel ECAL remain on schedule. Analysis of test beam data from the M0¢ module has started.

Good progress was reported on the magnet coil, HCAL, Trigger/DAQ the CPT and the electronics, which has developed into an integrated project across CMS.
 

    7.   DISCUSSION ON THE CMS ADDENDUM TO THE ECAL TDR The Committee heard a report on the referees’ reactions to the CMS Addendum to the ECAL Technical Design Report — Changes to the CMS ECAL Electronics (LHCC 2002-027 TDR 4-Add. 1). The primary change to the detector has been to move the trigger primitive generation from the off-detector electronics onto the detector, implying that the digitized data are read out only upon a Level-1 trigger accept. This will decrease the number of data links and the quantity of off-detector electronics as well as reducing the overall complexity.

The LHCC noted that a project management structure is in place and strong teams are working on the design, testing and commissioning of the electronics. The Committee considers that the design, which is well-underway, is reasonable and encourages the ECAL group to continue with the design ensuring in the process that risks are minimized. The Committee considers that the schedule to complete the Barrel ECAL electronics in 2004 and that for the Endcap ECAL in 2005 is challenging and is particularly concerned on the potential impact on the overall CMS schedule.

The Committee will continue reviewing the Addendum to the ECAL TDR and will make another full report at the next meeting of the LHCC.
 

    8.   REPORT FROM THE 8TH WORKSHOP ON ELECTRONICS FOR THE LHC    
          EXPERIMENTS
P. Sharp reported on the very successful Eighth Workshop on Electronics for the LHC Experiments held at Colmar on 9-13 September 2002. This series of Workshops encourages collaboration across the LHC experiments with the aim of finding common solutions and approaches to the electronics requirements of these experiments.

It was particularly stressed that prototyping of the LHC electronics is well-advanced and production has started for many of the sub-systems. The 0.25 m m CMOS technology has been very successful, while the yield of DMILL has not yet stabilized and the process will be terminated at the end of 2003. The LHCC also noted that FPGAs have a major role to play in the off-detector electronics. Moreover, the trend in microelectronics observed over the last two decades is expected to continue for the next 10 to 15 years, with the projection that by 2015 0.03 m m CMOS technology with 9 billion transistors per chip will be available.

Finally, P. Sharp argued that future developments in electronics technology should be closely monitored and that some resources should be allocated to this even during the LHC construction phase.
 

    9.   TEST BEAMS The SPS and PS Coordinator reported on the status of the test beams.

He presented the PS machine schedule for 2003, which similarly as for 2002 will run for a total of 171 days, and reviewed the PS East Hall beam requests. The Research Board approved the schedule on 14 November 2002. Due to the completion of the HARP experiment on the T9 beam line, beam time is still available at the PS East Hall.

He also reported on the proposal to move the PS East Hall proton irradiation facilities from the T7 to the T8 beamline once the DIRAC experiment has been completed. A feasibility study is currently underway to evaluate the proposal.

Moreover, in October 2002, a fast extraction from the PS was used to simulate LHC beam losses into ATLAS and CMS tracking detectors. For an equivalent flux of 109 protons/cm2 delivered within 300 ns, preliminary results show no damage to the tracking detectors. Further tests are planned for 2003 with series production tracking modules.

The SPS machine schedule for 2003 was also approved by the Research Board and consists of 4 days of detector setting-up prior to the 1-week run with LHC-type beams. This is to be followed by 14 weeks of fixed target physics with the standard slow extraction beam and a 39-day Indium heavy-ion run. ATLAS, CMS, COMPASS and NA48/2 have agreed to the above schedule, and the LHCC congratulates the SPS and PS Coordinator for brokering the agreement. Beam requests have been submitted by the experimental collaborations. Over 70% of the total available proton beam time has been requested by the LHC experiments and some beam lines are significantly overbooked. Moreover, in case NA49, NA57 and NA45 are approved for the Indium run, it would not be possible to schedule ALICE test beams with heavy-ions in 2003. Finally, the GIF users agreed on a reasonable schedule for the SPS beam time in 2003, including beam time for the RPC ageing tests.
 

    10. REFEREES
Following the changes to the LHCC membership, the new referee teams are as follows:

ALICE: S. Bertolucci, J. Panman (Co-ordinator), P. Seyboth, C. Vallée

ATLAS: A. Ceccucci, J.-J. Gomez-Cadenas, M. Jaffre, K. Tokushuku (Co-ordinator)

CMS : J. Dainton (Co-ordinator), Y.-K. Kim, J. Martin, P. McBride,

J. Nash, H. Tiecke

LHCb: K. Borras, F. Ferroni, Y. Karyotakis

TOTEM: J. Nash

MOEDAL: F. Ferroni

RD39: H. Tiecke

RD42: J.-J. Gomez-Cadenas

RD50 : J.-J. Gomez-Cadenas, C. Vallée

LCG : F. Ferroni, J.-J. Gomez-Cadenas, P. McBride
 

11. DATES FOR LHCC MEETINGS

        Dates for 2003:

                                29-30 January

                                26-27 March

                                21-22 May

                                2-3 July

                                24-25 September

                                26-27 November
 

       The LHCC received the following documents

          - LHCb Inner Tracker Technical Design Report (LHCC 2002-029/TDR8).

          - CMS Milestones (LHCC 2002-035/G-015)*.

          - ATLAS Installation Review (LHCC 2002-040/G-018)*.

          - LHC Computing Grid Project — Report on the LHCC Review of LCG to Computing Resources Review Board (LHCC 2002-042/G-020)*.

          - ATLAS Actions in Response to the LHCC ATLAS — Installation Review Report (LHCC 2002-043/G-021)*.
 
 

                                                                                        * Restricted circulation
 
 
 

Emmanuel Tsesmelis
E—mail: LHCC.Secretary@CERN.CH
Tel. 78949, 164057
 

LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424

                 janet.grant@CERN.CH