12 October 2005
LARGE HADRON COLLIDER COMMITTEE
1. ATLAS Status Report: Steinar Stapnes
2. LCG Computing Technical Design Report: Juergen Knobloch
3. ALICE Computing Technical Design Report: Federico Carminati
4. ATLAS Computing Technical Design Report: Dario Barberis
5. CMS Computing Technical Design Report: David Stickland
6. LHCb Computing Technical Design Report: Nicholas Brook
Present: S. Bertolucci (Chairman), K. Borras, P. Dauncey, J. Engelen, J. Haba, M. Hauschild, S. de Jong, V. Kekelidze, J. Knobloch, R. Landua, M. Mangano, J. Martin, M. Martinez-Perez, P. McBride, C. Niebuhr, B. Peyaud, K. Potter, C. Rembser, D. Schlatter, S. Smith, E. Tsesmelis (Secretary), C. Vall??e
Apologies: F. Forti
The Chairman thanked M. Hauschild for his work as SPS and PS Physics Coordinator from which he retires at the end of June 2005. His efforts have been essential for the successful definition and operation of the LHC test beam activities. The Chairman welcomed C. Rembser, the new SPS and PS Physics Coordinator, to the Committee.
The minutes of the seventy-sixth LHCC meeting (LHCC 2005-020 / LHCC 76) were approved without modification.
The LHCC took note of the FP420 proposal for R&D to investigate the feasibility of installing proton tagging detectors in the 420m region at LHC. The Committee will review the proposal through the appointed referee.
2. REPORT FROM THE CHIEF SCIENTIFIC OFFICER
The Chief Scientific Officer (CSO) reported on the LHC Project. Presentations to the Scientific Policy Committee and Council showed that the installation of the LHC remains on schedule for collisions in summer 2007. The LHC Computing Grid (LCG) financial plan for Phase II, covering the period 2006-2008, is being prepared and the short-fall in manpower is being addressed. CERN?Ĵs Medium Term Plan (MTP), which includes the temporary increase in manpower for the machine and experiments, was presented in June. Although accepted by the Scientific Policy Committee, the MTP was not approved by the Finance Committee and Council.
3. REPORT FROM THE ALICE REFEREES
The LHCC heard a report from the ALICE referees, concentrating on the general progress, Space Frame load tests, and a presentation of the overall milestones.
The Committee heard a report on the general progress of the ALICE experiment. Mounting of the Time Projection Chamber (TPC) modules is starting, while testing of the front-end electronics is progressing well and production of the read-out and control bus has started. Production of Silicon Strip Detector (SSD) modules is advancing but one of the production sites is not yet fully operational. The latter is under review and a report will be given at the next meeting of the LHCC. No further delay was reported for the start in summer 2005 of the SSD and Silicon Drift Detector (SDD) ladder assembly, but the Committee considers that the coordination between production sites requires improving. Start of module assembly for the Time-of-Flight (TOF) detector is imminent while packaging and testing of the HPTDC read-out chips is in progress and production of the low voltage systems has started. Sector-0 for the V0-A and V0-C detectors have been built and are being tested in radiation fields. Testing of the full read-out chain for the Forward Multiplicity Detector (FMD) is nearly complete and radiation tests will follow. Assembly of the dipole magnet in its final position is complete and is to be powered in early July 2005. The muon trigger front-end boards have been produced and tested. The problem with the larger than expected gain dispersion of the MANAS read-out chip has been solved but a new possible problem with its stability has been identified and is under investigation. A large-scale test of the High Level Trigger (HLT) decision transfer to the DAQ has been completed.
The referees also reported on the preliminary results from the full load test of the Space Frame. The preliminary results show that the measured deformations are about 30% less than calculations, which has been understood to arise from the use of more robust elements in the as constructed assembly. The studies have provided information for the used to develop the sequence of TOF and Transition Radiation Detector (TRD) module installation that will be studied in the ongoing load tests.
4. REPORT FROM THE ATLAS REFEREES
The LHCC heard a report from the ATLAS referees, concentrating on the general progress of the sub-systems, and the status of computing and physics studies.
Good progress was reported on the Barrel Toroid (BT) and End-Cap Toroid (ECT) magnets. Integration and testing of the eight BT coils on the surface is complete and the last coil will be installed in the underground cavern by the end of July 2005. BT-8 (formerly refereed to as BT-3) has been cooled-down three times and exhibits consistently an acceptable resistance to ground of >>10 kW. A functional test of the complete BT is scheduled for the end of 2005. No major concerns were reported for the ECT. All 16 coils and keystone boxes for the ECT are prepared and ready for assembly. Assembly of ECT-C has started and will be installed in the underground cavern in April 2006, while installation of ECT-A is scheduled for September 2006.
Good progress was reported on the installation and integration of services in the experimental area. Installation of cables and pipes in the underground caverns is in progress but the installation teams need additional strengthening.
The LHCC took note of the observation of cosmic-ray events by the Tile Calorimeter in the underground experimental cavern.
The referees also reported on the status of the Inner Detector. Assembly of the Semiconductor Tracker (SCT) Barrel and End-cap is advancing. Production of the harnesses for the Transition Radiation Tracker (TRT) has sped up and solutions have been found for several problems reported recently. such as the loss of TRT fuses, the cracks on the LMT connections of the SCT, and faulty MCC potting and stave delamination for the Pixel detector. It is expected that the resulting delays would be absorbed in the overall ATLAS schedule.
Progress was reported on the Muon System. Production of Monitored Drift Tube (MDT) and Resistive Plate Chamber (RPC) detectors is progressing and the required assembly of 8-10 planes/week of MDT and RPC Integrated Barrel Stations has been reached but the schedule remains tight. The RPC panel delamination problem has been overcome. Larger than expected leakage currents have been observed in RPCs from an early production batch. The isolation of the gas volumes edges is now done with a more suitable profile thus minimizing the problem. Re-assembly of the chambers from this early batch is being scheduled. This problem has slowed-down the certification tests of the MDT-RPC. Production of the Thin Gap Chamber (TGC) end-cap trigger detectors is approaching completion and the first of the 72 TGC sectors has been assembled and equipped with services. The timely construction of the Muon Spectrometer Big Wheels remains the last item potentially of concern.
The referees also reported on the ATLAS Computing. The general schedule for ATLAS computing is being met and the required resources for the future work are being evaluated, indicating that additional manpower will be required. Planning for the ATLAS commissioning is in progress.
The Committee took note of the report on the ATLAS Physics Workshop held in Rome in May 2005. Physics and combined performance groups have been created and the wide use of new software tools throughout the Collaboration has provided important feedback to the developers.
5. REPORT FROM THE LHCb REFEREES
The LHCC heard a report from the LHCb referees, concentrating on the status of the detector construction and on the Second Addendum to the Muon System Technical Design Report.
The referees reported on the status of the detector construction. Production of Vertex Locator (VELO) modules is advancing but the schedule remains tight and the required construction of 10 modules/month is yet to be demonstrated. Delivery of sensors for the Inner Tracker (IT) and Trigger Tracker (TT) is now satisfactory and the problems with the hybrid electronics vias have been solved but the schedule remains tight. Delays in the Outer Tracker production have been recovered and the production rate and the quality of the completed chambers are good. Assembly of RICH-2 is progressing according to schedule and is on time to be installed in the underground cavern in August 2005. Work on the RICH-1 detector is advancing but concerns remain about the timely availability of the beryllium mirrors and the Hybrid Pixel Detectors (HPDs). A further two week delay was reported in the HPD production schedule and the delivery of the HPDs will now be completed only in January / February 2007. Their installation is, however, expected to be straight-forward. Production of MWPCs for the Muon System continues to be late, which may result in the staged installation of the M1 station.
The Committee heard a report on the status of work in the UX85 experiment cavern. Work is advancing well on the assembly of the Electromagnetic and Hadronic Calorimeters, the positioning of the gantry, the installation of the RICH-1 magnetic shielding and the field mapping of the dipole magnet. Installation of the LHC machine cryogenics line is progressing well and work is expected to be completed in time for the subsequent LHCb activities in the area.
The LHCC took note of the updated list of LHCb milestones. The schedule and milestones of the experiment have now been aligned to the general LHC machine schedule released on 1 April 2005. The updated schedule has LHCb ready for beam on 1 July 2007.
6. LHCb SECOND ADDENDUM TO THE MUON SYSTEM TECHNICAL DESIGN REPORT
The LHCC has completed its scientific and technical evaluation of the LHCb Second Addendum to the Muon System Technical Design Report. The Second Addendum describes the choice of technology for the inner-most regions R1 and R2 of Muon Station M1, for which ageing due to high particle rates has been studied. The LHCC finds the technology proposed for the chambers adequate to achieve the physics goals stated in the Technical Proposal and congratulates the LHCb Collaboration for the work presented in the Second Addendum to the Muon System Technical Design Report.
The Committee has no major concerns. An ancillary document (LHCC 2005-029/G-099) contains the agreed procedure for monitoring the progress of the project. The LHCC review was not an engineering review, although some engineering aspects of the project were presented and discussed with the referees. The LHCC recommends that LHCb follows the established practice of conducting independent reviews of the engineering designs. Written reports should be made available to the LHCC through its referees.
The LHCC recommends general approval of the LHCb Second Addendum to the Muon System Technical Design Report. The LHCC considers the schedule and milestones given in the Second Addendum to be reasonable. They will be used by the Committee to measure and regulate the future progress of the project.
7. REPORT FROM THE TOTEM REFEREE
The LHCC heard a report from the TOTEM referee. Design of the Cathode Strip Chamber (CSC) detector for the T1 Telescope is complete and series production is to start soon. The final design of the GEM detectors for the T2 Telescope is finished and pre-production detectors are under construction. The first complete T2 Telescope will be tested in beam during 2006. Design of the Roman Pot stations is underway and the final prototype is expected to be ready by the end of 2005. The edgeless silicon detectors have been designed and a pre-series will be produced soon. A common CMS/TOTEM Physics Letter of Intent is in preparation and will be submitted to the LHCC at the end of 2005. Recent reviews of the TOTEM detectors and electronics by a CMS group concluded that the TOTEM systems are compatible with the CMS electronics read-out and DAQ. The lack of TOTEM manpower identified is to be monitored, particularly in view of the recent enlargement of the TOTEM Collaboration. TOTEM is proceeding to finalise their Memorandum of Understanding during this summer.
8. REPORT ON THE COMPUTING TECHNICAL DESIGN REPORTS
The LHCC heard a report from the LCG referees focusing on the status of the LCG and the Computing Technical Design Reports.
The referees reported on the status of the LCG. Planning for the LCG computing procurement is underway. The LCG and experiments are working on defining the baseline services for early LHC operations. The ongoing Service Challenge 3 (SC3) has the aim of testing disk-to-tape transfers, to include a few Tier-2 centres and to be run as a production service. The experiments expect that the SC3 will lead to a real production service by the end of 2005, representing a realistic build-up to the LHC service.
The Committee heard a report on the referees?Ĵ preliminary reactions to the five Computing Technical Design Reports submitted in June 2005. The Technical Design Reports contain updates of the computing models together with descriptions of data management systems, analysis models and requirements for the LCG. The Committee will review the Computing Technical Design Reports through the summer and make a full report to the LHCC sessions in the autumn.
9. TEST BEAMS
The SPS and PS Coordinator reported on the test beams.
Further delays were reported on the repairs to the PS main magnets. No main coils within tolerance have been delivered to CERN and only two of the 240 pole face winding coils have been delivered. Good progress was reported on other consolidation work, including the PS septum for beam extraction to the SPS, AD and nTOF, the bending magnet for LHC irradiations in the PS East Hall, water infiltration into the SPS tunnel and water leaks in the SPS main magnets.
Following the dismantling of the SPS West Area beam lines in 2004, the respective LHC test beam users are being moved to the North Area line. The Gamma Irradiation Facility (GIF) continues stand-alone operation with the source in the West Area. A new GIF facility in the North Area will only be considered for the LHC luminosity upgrade work.
The Coordinator also showed the revised accelerator draft schedule for 2006 which has the SPS physics runs ending in early November. Running in November and December, as was foreseen in the original draft schedule, would have exceeded the foreseen budget.
10. CMS COMPREHENSIVE REVIEW
Since the fifth of the CMS Comprehensive Reviews in October 2004, the CMS Collaboration has made very significant progress towards the realisation of an experimental set-up ready for LHC operation in the Summer 2007.
It is realistic to expect CMS to install an initial working detector suitable for LHC operation starting in Summer 2007, although the completion of the detector installation can be foreseen beyond this date. The LHCC considers that the CMS schedule to achieve this is challenging. Excellent progress was reported on the construction of Electromagnetic Calorimeter (ECAL) and Tracker but their respective schedules remain tight. Good progress was also reported on the construction of the Resistive Plate Chambers (RPCs) RE2 and RE3 but their installation in CMS on the surface is tight. Installation of the ECAL End-cap (EE) and Preshower (ES) detectors is now scheduled for the 2007/2008 winter shutdown period. The Pixel Detector, although expected to be ready for the LHC pilot run, will also be installed during the 2007/2008 winter shutdown period to minimize risk of damage during the initial stages of LHC operation. The LHCC noted that additional resources, both in terms of money and manpower, would aid in accelerating the current CMS schedule, and thereby would ensure a timely completion of the initial detector in 2007.
The sixth annual LHCC Comprehensive Review of CMS took place on 27-28 June 2005. The LHCC referees addressed the following areas: Tracker, Electromagnetic and Hadronic Calorimetry, Muon Spectrometer, Trigger/DAQ, Computing/Software, and the topics of Management, Technical Coordination, Integration, Schedules and Costs.
The conclusions and concerns of
the LHCC are given below. They will help the Committee to follow up outstanding
issues and to monitor future progress of this project in forthcoming sessions of
the LHCC prior to the next CMS Comprehensive Review one year hence.
?? Excellent progress was reported on the Tracker Project but the schedule remains very tight. Technical problems with the sensors and Hybrid electronics have been solved and their delivery is advancing well. Production of modules and the assembly of the Tracker Inner Barrel (TIB), Tracker Outer Barrel (TOB) and Tracker End Cap (TEC) is progressing smoothly. The Tracker Project is overseen by a greatly improved organization and communication structure.
?? Very good progress was reported on the ECAL electronics, sub-systems and testing activities. The production of crystals continues to dominate the ECAL schedule, resulting in a very tight schedule for the installation of the detector in CMS.
?? Excellent progress was reported on the Hadron Calorimeter (HCAL) with no major concerns having been identified. The LHCC considers that the organization of work concerning the integration, commissioning and testing to be reasonable.
?? Good progress was reported on all sub-detectors of the Muon Spectrometer ?Ĭ Drift Tubes (DTs), Cathode Strip Chambers (CSCs) and Resistive Plate Chambers (RPCs). However, delivery of the RPC Endcap RE2 and RE3 sub-detectors is delayed and the time for installation of the Muon Spectrometer is tight.
?? Good progress was reported on the Trigger and DAQ Projects. Both projects are advancing according to schedule and no major concerns were identified.
?? The software and computing structures have been re-organised to address the concerns expressed at the previous Comprehensive Review and the problems identified during the Data Challenge 2004. The LHCC endorses the proposed plan, whose ambitious milestones will need to be closely monitored. Successful testing of the computing and software infrastructure during the Cosmic Challenge is crucial and it is recommended that the Collaboration provides the appropriate support. Following the timely completion of the Computing Technical Design Report, work for the Physics Technical Design Report is underway.
?? Good progress was reported on the magnet and the remaining surface and underground areas have been handed over to CERN. Preparations are well-underway for the magnet test and Cosmic Challenge on the surface. Some delays have been accumulated with respect to the baseline CMS Master Schedule v34.2 and additional resources have been requested to the CMS Research Review Board to consolidate the CMS schedule. It is realistic to expect CMS to have installed an initial working detector, without the ECAL End-cap (EE) and Pixel Detector, suitable for the first operation of the LHC starting in the Summer 2007.
Following changes to the LHCC membership, the new referee teams are as follows:
ALICE: P. Dauncey, J. Haba, C. Vall??e (Co-ordinator)
ATLAS: F. Forti, V. Kekelidze (Co-ordinator), R. Landua, M. Martinez-Perez
CMS: S. de Jong, J. Martin (Co-ordinator), P. McBride, S. Smith
LHCb: K. Borras (Co-ordinator), C. Niebuhr, B. Peyaud
TOTEM: K. Borras
MOEDAL: B. Peyaud
LHCf: M. Mangano, C. Niebuhr
RD39: S. de Jong
RD42: V. Kekelidze
RD50: C. Vall??e
LCG: P. Dauncey, F. Forti, M. Martinez-Perez , P. McBride
12. DATES FOR LHCC MEETINGS
Provisional Dates for 2005:
- ALICE Computing TDR (LHCC-2003-018/TDR 12)
- LHCb Computing TDR (LHCC-2003-019/TDR 11)
- ATLAS Computing TDR (LHCC-2003-022/TDR 17)
- CMS Computing TDR (LHCC-2003-023/TDR 7)
- LCG Computing TDR (LHCC-2003-024/TDR 1)
FP420: An R&D proposal to investigate the feasibility of installing proton
detectors in the 420 m region at LHC (LHCC-2005-025/I-015)
- CMS Comprehensive Review (LHCC-2005-027/G-97)*
- Review of the second Addendum to the LHCb Muon System TDR (LHCC-2005-29/G-099)*
* restricted circulation
Tel. 78949, 164057
LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424