Minutes of the sixty-first meeting held on
Wednesday and Thursday, 27-28 November 2002
1. Status of the LHC Machine Magnets and Schedule: L. Evans
2. Report from the Tevatron Collider Programme: G. Chiarelli
3. LHC Luminosity and Energy Upgrade: T. Virdee
4. Status of the LHCb Detector Re-optimisation and Related Issues: T. Nakada
5. Status of the LHCb Detector: W. Witzeling
6. LHCb Inner Tracker Technical Design Report: F. Lehner
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
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.
The Director for Collider Programmes informed the Committee on various issues concerning the LHC programme.
The latest LHC Resource Review Boards (RRBs) were held at the end of October 2002. The reports from the LHCC, including those on the Installation Reviews, were well-received. The RRBs expressed support for the cost-to-completion plans of ALICE, ATLAS and CMS, and furthermore approved all M&O budgets for 2003. Moreover, the RRB for the LHC Computing Grid Project (LCG) took into account the recommendations from the LHCC. The Committee will continue reviewing the LCG in detail.
The December 2002 Council session will include discussions on the CERN long-term plan up to 2010 and an in depth review of CERN personnel and material needs and projections.
The next series of LHCC Installation Reviews for the experiments will be held in March 2003. It will be the first such review for ALICE and LHCb, while there will be follow-up reviews to those in September 2002 for ATLAS and CMS. The reviews will also include a discussion on the experiment commissioning needs, including planning for the Trigger/DAQ and calibration procedures.
The LHCC also discussed issues arising from the Open Session. The Committee noted that the LHC dipole and quadrupole magnet production is ramping up and within a year a better idea of the production rate will be available. The required tooling is in place and is consistent with the peak production rate required. Moreover, the cable production is now close to the rate needed. Discussions on possible solutions to the observed multipole errors are ongoing, and it is believed that the current errors can be minimized by corrector magnets. As also concurred to by the LHC External Independent Review Committee, the LHC project is committed fully to the present schedule, which although challenging, has LHC operation starting in April 2007.
In addition, upgrading the LHC luminosity can extend the physics reach of the LHC at a moderate extra cost relative to the initial LHC investment, and can increase the LHC lifetime and bridge the time gap to a new future machine. To realize this reach, the detectors must preserve their performance and to do so would need launching a directed detector R&D programme to match that for the accelerator. As the LHC remains the highest priority, resources for an upgrade will only be available later in the decade.
Finally, the LHCC took note of the report on the Tevatron Collider
programme. Following improvements in the accelerator performance, physics
analysis has commenced with the aim of presenting several results at the
Winter 2003 conferences.
The referees reported on the status of the LHCb detector re-optimization.
The LHCC noted the good progress in the re-optimization process, particularly
in the convergence of the detector design and lay-out, the design of the
experimental beampipe and the improved performance of the Level-1 trigger by
extending the magnetic field towards the vertex. The LHCb Detector
Re-optimization TDR - which will also describe the experimental beampipe, the
TT tracking station and the RICH-1 - and the Trigger TDR will both be
submitted in September 2003. As part of the re-optimization studies, the LHCC
requests that LHCb carries-out an assessment of the detector performance with
a few benchmark physics channels. Results from this assessment should be
communicated to the LHCC in the intervening period leading up to submission of
the LHCb Detector Re-optimization TDR.
The Committee heard a report on the referees’ preliminary reactions to the LHCb Inner Tracker Technical Design Report (LHCC 2002-029 / LHCb TDR 8). The TDR describes the tracking system in the innermost region of the three T1-T3 stations around the beampipe, where particle densities are highest. The LHCC considers that the chosen technology of silicon strip detectors is reasonable. The Committee requests additional information concerning the Inner Tracker physics performance and its integration in LHCb. The Committee is currently reviewing the LHCb Inner Tracker TDR and following further questions and discussions, the referees will make a full report at the next meeting of the LHCC.
Progress was reported on the RICH. The new pixel chip, LHCBPIX1, exhibits good performance at 40 MHz and satisfies the LHCb requirements. Progress was also shown on the bump-bonding of the sensor/chip assembly of the HPD and in parallel the BEETLE chip has been submitted for the MaPMT back-up option. However, the LHCC considers that the RICH photodetector remains a critical item for LHCb. The choice between the HPD and MaPMT technologies is now scheduled to be taken in October 2003.
The LHCC also noted the good progress in the magnet, ECAL, HCAL, SPD, PS, VELO, Outer Tracker, Muon Detector and experimental area.
The LHCC took note of the updated list of milestones submitted after re-alignment to an April 2007 LHC start-up. The Committee will review the milestones in detail as part of the LHCb Comprehensive Review.
The first of the LHCC Comprehensive Reviews and Installation Reviews of
LHCb are scheduled for January and March 2003, respectively.
The LHCC took note of the document `ATLAS Actions to the LHCC Report CERN/LHCC 2002-040’ (LHCC 2002-043/G021) submitted to the Committee in preparation to the follow-up Installation Review in March 2003.
The referees also reviewed the ATLAS Installation Schedule (Version 6). Every ATLAS system is required to meet its `Ready for Installation’ milestone, which includes a 4-month float prior to the actual installation date. Currently, the Barrel Toroid coils 7 and 8, the LAr Barrel Calorimeter and the LAr Endcap Calorimeters have a reduced float. Concerning the LHCC milestones, re-baselining is required to align the milestones to the new LHC schedule, that has LHC operation starting in April 2007, and to the ATLAS Installation Schedule (Version 6).
The referees also reported on the Computing and HLT / DAQ systems. Good progress was reported on the Computing. Moreover, preparations for the HLT/DAQ TDR are underway. A Final Design Review is scheduled for March 2003 with the TDR to be submitted to the LHCC in June 2003. The Committee considers that although the basic architecture is described in the HLT/DAQ Technical Proposal, several options for the HLT/DAQ still exist, making the schedule for submitting the TDR very tight.
The LHCC also heard a report on the Inner Tracker. Improvements in the DSM electronics of the Pixels have not been traced back to some specific production step. Large yield variations may occur again and should be included in the production plan. Good progress was reported on the new gas mixture for the TRT. The new gas properties are being evaluated and no significant change to the TRT performance is observed with the new TRT gas mixture Xe(70%) + CO2(27%) + O2(3%). It was however, found that the new gas mixture is more sensitive to Si pollution and special measures will be required to reach the necessary level of purity. The LHCC took note that the performance of the SCT Endcap modules after irradiation to 3´ 1014 p/cm2 just meets the specification. The SCT must now proceed with production, but given the degradation with irradiation, the LHCC will continue monitoring progress.
The referees also reported on the status of the calorimeters. Good progress was reported on the Tile Calorimeter mechanics and instrumentation and on calibration in test beams. The LHCC noted, however, that the ATLAS `Ready for Installation’ milestones (Version 6) are not consistent with the Tile Calorimeter pre-assembly schedule and this must be rectified. Furthermore, series production of the electronics Drawers is scheduled to start in January 2003, following resolution of the still outstanding concerns with the late delivery of components and their high failure rate. Good progress was reported on the module production for the LAr calorimeter and on the Presampler. The LHCC expressed concern at the delays in the End-cap A and End-cap C cryostats of the LAr calorimeter and considers the schedule to be critical. Moreover, the EMEC assembly table is on the critical path and care must be taken in scheduling the HEC and FCAL beam tests as they share the same cryostat. The three modules for the FCAL-C are complete and are at CERN for integration. Good progress was reported on procuring the W rods for the FCAL-A and this detector is now scheduled for completion in the spring of 2003. Finally, some engineering samples of the low voltage regulators will be available in December 2002 but there remains a significant delay in launching the series production of the front-end electronics.
The referees also reported on the Muon Spectrometer. Production of the MDT
chambers is proceeding at the expected rate, although leaks were found in the
brass gas tubelets. This should not delay completion of the chambers and the
LHCC will monitor closely the situation. Good progress was reported on the CSC
and TGC production. Four RPC production chambers are being tested at the GIF.
In parallel, manufacture of the final chambers is proceeding although there
are some delays due to the production of read-out panels. The LHCC noted that
the Quality Control procedure still needs to be specified completely and that
the failure rate of gaps and the reduced efficiency after transport of the
chambers to CERN need to be further understood.
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.
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.
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.
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.
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.
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
Dates for 2003:
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)*.
Tel. 78949, 164057
LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424