LARGE HADRON COLLIDER COMMITTEE
1.Report from the LHC Project Workshop - CHAMONIX XIII: Roger Bailey
Status Report: James Pinfold
Present: S. Bertolucci, J.-J. Blaising* (representing D. Schlatter), K. Borras, M. Calvetti (Chairman), L. Camilleri* (representing D. Schlatter), A. Ceccucci, J. Engelen, F. Ferroni, M. Hauschild, M. Jaffre, Y. Karyotakis, V. Kekelidze, J. Knobloch, M. Mangano, J. Martin, P. McBride, K. Potter, L. Roberston*, P. Seyboth, P. Sharp*, H. Tiecke, E. Tsesmelis (Secretary), C. Vallée, T. Wyatt
Apologies: Y.-K. Kim
*) Part time
The minutes of the sixty-eighth LHCC meeting (LHCC 2004-005 / LHCC 68) and the report from the LHCb Comprehensive Review (LHCC 2004-006 / G-070) were approved without modification.
2.REPORT FROM THE CHIEF SCIENTIFIC OFFICER
The Chief Scientific Officer (CSO) informed the LHCC on the status of the LHC Project. The overall machine schedule is under review. Installation of the cryoline in Sector 7-8 is now progressing with the first two sub-sectors of Sector 7-8 to be completed at the end of March essentially on schedule. The delays in the installation of the LHC machine caused by difficulties in the Sector 7-8 cryoline are being recovered by introducing parallel work for both the sector installation and hardware commissioning phases. These phases are to be followed by the machine checkout and beam commissioning operations. The revised LHC machine schedule will be released at the end of April 2004.
3.REPORT FROM THE ATLAS REFEREES
The LHCC heard a report from the ATLAS referees, concentrating on general issues from the Collaboration, progress in the experimental area, the status of sub-systems and the overall schedule.
The LHCC took note of certain general matters concerning the ATLAS Collaboration. Peter Jenni has been re-elected spokesperson for the period September 2004 to August 2007. The Committee received the two ATLAS Letters of Intents on Forward Detectors for Luminosity Measurement & Monitoring (LHCC 2004-010 / I-014) and Heavy-ion Physics with the ATLAS Detectors (LHCC 2004-009 / I-013) and they will be presented to the LHCC Open Session in May 2004. Finally, the Committee took note that an initial framework has been set-up within ATLAS to steer R&D work for a future high luminosity upgrade of the LHC.
Good progress was reported on the installation of the infrastructure and technical services in the UX15 and USA15 underground caverns.
In view of the delays in the Barrel Toroid magnet, installation of the Barrel Calorimeter has been advanced by 3 months and is presently well underway. The first modules of the Tile Calorimeter have been lowered into the experimental cavern as planned on 1 March 2004 and their installation is in progress. The solenoid magnet has been installed in the LAr calorimeter cryostat in Building 180 and will subsequently be lowered in to UX15.
The revised working schedule for the Barrel Toroid is consistent with closing the beampipe through ATLAS in November 2006. This schedule has the first coil ready for transport to Point 1 at the end of July 2004 and the eighth, and last, coil in mid-March 2005. The welding of cooling lines has been done by CERN and all lines are now available. Additional measures, such as the earlier installation of technical services and muon chambers and the introduction of more parallel work, are being taken to recover part of the delay in the Barrel Toroid.
The LHCC heard a report on the Inner Detector. Good progress was reported on the Pixel detector and on the Barrel and End-cap C TRT detectors. Although a significant number of Barrel SCT modules have been produced, the necessary repair to the module support brackets has resulted in their being no float left in the barrel assembly schedule. Module production of the End-cap SCT has started at several sites but the schedule remains tight as only three and two months of float are left for the completion of the End-cap C and End-cap A, respectively. The de-lamination problem of the TRT End-cap Web electronic circuits has been solved and the TRT End-cap wheel assembly is well underway but the TRT End-cap A has only two months of float remaining.
Good progress was reported in other areas. Production of muon precision and trigger chambers is advancing and integration of the first MDT ? RPC stations with all services has started. Preparations for the combined test beam runs in the North Area are well-underway and a dedicated working group has been created to prepare and develop the ATLAS Control Room in SCX1.
The referees also reported on the status of the ATLAS electronics. All front-end ASIC electronics have been produced except the FEI for the Pixel detector, the CMA for the RPCs and the SLB for the TGC. Most of the front-end electronic systems are in fabrication and Production Readiness Reviews are scheduled for the next few months prior to launching production of the remaining systems. Finally, several systems have started production of power supplies and the grounding and shielding issues are being reviewed.
4. REPORT FROM THE CMS REFEREES
The LHCC heard a report from the CMS referees, concentrating on the progress in the Tracker and ECAL projects and a review of the overall CMS schedule.
The Committee took note of the delays in the production of crystals for the ECAL, delays which present a serious threat to completing the ECAL on time. Discussions are continuing between CERN and the parties concerned in Russia to resolve the current impasse and promising progress with other potential suppliers was reported. CMS plans to have a complete SuperModule in beam by the end of September 2004. However, delivery of packaged front-end chips from the final engineering run is considered to be tight and CMS would profit from a two-week extension to the SPS run in to November 2004. CMS requests beam in 2006 to continue the calibration with additional SuperModules. The LHCC has requested a memorandum from the Collaboration providing justification for the calibration in 2006. Progress on the APD photosensors, the mechanics for the ECAL and the Preshower is good.
The critical path in the Tracker schedule is driven by the delivery of the thick sensors. The LHCC considers that the partial move of the thick sensor contract from the firm ST Microelectronics to Hamamatsu is a positive step as it should help recover current delays. The upcoming milestone in June 2004 concerning the quality control of the current batch of 1000 sensors is deemed to be important input prior to deciding on the continuation of production at ST Microelectronics and the impact on the Tracker schedule. The LHCC will continue monitoring progress. The new schedule has the Tracker transported to Point 5 in May 2006, which represents a 6-month delay with respect to the previous schedule and which also has no contingency left.
The LHCC took note of progress in various systems. The first of five magnet coil modules has been delivered to CERN. Failure of the HV board of the DTs is due to an imperfect adhesion of passivation layer and/or the HV traces and ground plane being too close. New HV boards are to be manufactured and the installation sequence has been revised accordingly. Finally, production of Minicrate electronics for the DT is expected to be just-in-time.
Delays to critical path tasks on the surface, including those for the magnet coil, magnet yoke services and installation of the DT/RPC and delays to those in the underground areas ? concerning the civil engineering, the Tracker and the ECAL ? have resulted in a new schedule version V34.0. The LHCC considers that the new schedule is reasonable, but uncertainties in the deliverables for installation, most notably those for the ECAL and Tracker, risk compromising the new schedule.
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 schedule and milestones.
Assembly of the magnet is progressing according to schedule. The magnet is to be moved to its final position in July 2004 and the commissioning and field mapping is scheduled for the second half of 2004. The interface to the LHC Machine elements in UX85 continue to be good.
The LHCC heard reports on several of the sub-systems. Good progress was reported on the VELO, the Inner Tracker, Outer Tracker and Calorimeters. Following approval at Finance Committee in March 2004, the order for the beryllium beampipe is to be placed soon. Four RICH HPD tubes have been received from the firm DEP with three of them working perfectly and with one being under investigation as it has two rows missing. Production of the RICH electronics has been agreed with the firm VTT. Design of the RICH-1 is progressing, but its completion remains on a tight schedule, while construction of RICH-2 is continuing. Following further ageing tests, GEM chambers have now been confirmed as the technology for the innermost region R1 of station M1. An Addendum to the Muon System Technical Design Report is in preparation. Production of the MWPCs has started following the successful Production Readiness Reviews. The chamber construction and installation plan will be revised this summer once the production rates are established. Construction of the muon filter is planned to start in May 2004. The LHCC noted that the schedule for the Muon System electronics remains tight and will continue monitoring it.
6. REPORT FROM THE TOTEM REFEREE
The Committee heard an additional report on the referee’s preliminary reactions to the TOTEM Technical Design Report (LHCC 2004-002 / TDR 1).
The Committee welcomes the close cooperation between TOTEM and CMS established particularly since the previous LHCC meeting and encourages both Collaborations to proceed with further optimization of the scheme whereby both experiments study physics issues of common interest and the use of common data to calibrate the luminosity monitors.
Although there are no concerns that the TOTEM detector technologies pursued are adequate to achieve the physics goals stated in the TOTEM Technical Proposal, the LHCC requests clarification of certain items in an Addendum to the TOTEM Technical Design Report to be submitted to the Committee.
The LHCC will continue reviewing the Technical Design Report through the spring and present its recommendation at its session in May 2004.
7. REPORT FROM THE MOEDAL REFEREE
The LHCC heard a report from the MOEDAL referee, concentrating on a review of the progress made since the submission of the Letter of Intent in 1999.
The MOEDAL Collaboration proposes to identify the signature of highly-ionising particles such as monopoles through correlated signals in several plastic foils. It is proposed to house the MOEDAL detector in segments around the LHCb VELO detector providing a fast access to the latter.
The LHCC encourages the MOEDAL Collaboration to continue the development of their experimental design with a view to submitting a Technical Proposal by the end of 2004. Future studies should concentrate on finalizing the design of the MOEDAL detector in close collaboration with the LHCb VELO group and with CERN safety experts, completion of the material inventory of the MOEDAL detector to include the VELO, the production of a hemisphere prototype, finalisation of Monte Carlo studies of the detector sensitivity to radiation in the LHCb VELO region, and the simulation of the detector’s response and acceptance of monopoles.
8. REPORT FROM THE LCG REFEREES
The LHCC heard a report from the LCG referees, concentrating on the response to recommendations from the recent LCG Comprehensive Review, an update on the conditional database project and a review of the schedule and milestones.
A report was given to the LHCC referees in response to the recommendations from the recent LCG Comprehensive Review. Good progress was reported in the LCG Management, Middleware, Grid Deployment, and the Applications Area. The responses were reviewed by the LCG Project Execution Board (PEB) at its meeting in March 2004. The LHCC, however, expressed concern over the limited deployment of the Grid in institutes in Europe. It is anticipated that with the preparation of the Computing Memorandum of Understanding within the next 12 months, this difficulty will be rectified.
Progress was also reported on the Conditional Database Project. The kick-off workshop was found to be very useful and the work has now started according to the proposed project work plan. The LHCC, however, noted the limited manpower available to work on this project and this issue must be taken into account in the overall LCG planning of resources.
The referees also reported on the LCG milestones. The Level-1 milestones have been agreed by the PEB. The work-plan for the Applications Area is being established now and more details are expected for the May 2004 session of the LHCC. Furthermore, planning for Phase II is underway as is that for the interoperability with the Grid projects in the US.
9. REPORT ON DETECTOR ELECTRONICS FOR AN UPGRADED LHC
P. Sharp reviewed a plan for R&D in electronics for future upgrades to the LHC experiments. His presentation concentrated in five issues: a) what has the high-energy physics community learnt regarding electronics in the past 15 years, b) what technology will be available to the LHC collaboration in the future, c) what will be required to upgrade the LHC experiments, d) what R&D in electronics will be required and e) how could this R&D be organized.
He reviewed the CMS SLHC Workshop held in February 2004. The conclusions from this workshop are the following: a) any upgrades to the electronics must build on the experience of the original development, construction and commissioning teams, b) the original teams must be involved in the future R&D, and c) given that in the next two years most of the design teams will have completed their commitments to CMS, now is a good time to start considering an R&D programme to upgrade CMS.
P. Sharp concluded his presentation by inviting the LHCC to a) endorse the initiative to extend the excellent partnership with IBM from 0.25 mm CMOS technology in to Deep Sub-Micron (DSM) technologies through an extension to the frame contract, b) note that there exists a basis set of six electronics R&D projects which have been identified by at least one of the LHC experiments and c) note the plan to develop this basic set of electronics R&D projects into future proposals. The LHCC endorsed the first and took note of the latter two points.
It is expected that proposals of how to continue with the R&D in electronics will be available towards the end of 2004, at which point the LHCC will review the status again.
10. TEST BEAMS
The SPS and PS Physics Coordinator gave a report on the LHC test beams.
Modifications to the 2004 SPS schedule were approved by the Research Board on 26 February 2004. The changes consist of an additional 3-day period for the SPS scrubbing run in June 2004 and two 8-hour shifts for the test of the TOTEM Roman Pots in October 2004.
Start-up of the accelerator chain for the 2004 run is in progress with the cold checkout of the PS Complex progressing well and the PS being on schedule to start at the end of April followed by the SPS in early May.
The SPS and PS Coordinator also reviewed the activities planned by the LHC experiments in the experimental areas of the SPS during the long accelerator shutdown period starting in autumn 2004 and noted that first requests for beam-time in 2006 are becoming available.
He also noted that the consolidation programme for the SPS is underway.
11. ALICE COMPREHENSIVE REVIEW
The fourth of the LHCC Comprehensive Reviews of ALICE took place on 24-25 March 2004. The LHCC referees addressed the following systems and areas: Inner Tracking System, Particle Identification, Time Projection Chamber, Calorimeters and Forward Detectors, Dimuon Forward Spectrometer, Trigger, Data Acquisition, High-Level Trigger and Controls, Software and Computing, Physics, and the topics of Management, Technical Coordination, Integration, Schedules and Costs.
Since the third of the Comprehensive Reviews in March 2003, the ALICE Collaboration has made very significant progress towards the realisation of an experimental set-up ready to record proton-proton and heavy-ion collisions at the LHC. The LHCC considers it reasonable to expect ALICE to be ready for first LHC operation in April 2007. In particular, most of the detector technologies to be used, together with the associated electronics, have successfully gone through the R&D phase and several major sub-systems, such as the Time Projection Chamber (TPC), dipole magnet, High Momentum Particle Identification Detector (HMPID), Zero Degree Calorimeters (ZDCs), Dimuon Forward Spectrometer, and support structures, are in the production phase. Series production of the Inner Tracking System (ITS), Transition Radiation Detector (TRD), and the Time-of-Flight (TOF) detector must start imminently as their production schedule is considered to be tight. The Collaboration has adopted measures to control increases in the cost-to-completion. Moreover, the LHCC considers that ALICE has addressed satisfactorily the concerns of the LHCC at the previous Comprehensive Review.
The conclusions and concerns of the LHCC are given below. They will allow the Committee to follow-up outstanding issues and to monitor future progress of this project in upcoming sessions of the LHCC prior to the next ALICE Comprehensive Review.
§Good progress was reported on all elements of the Inner Tracking System (ITS) ? Silicon Pixel Detector (SPD), Silicon Strip Detector (SSD) and the Silicon Drift Detector (SDD). However, the series production of the ITS sub-detectors must start imminently as there is no contingency left in the assembly schedule. A more accurate evaluation of the schedule can be made once the series production is underway.
§ Good technical progress was reported on the particle identification detectors. The LHCC, however, noted that the production schedule for the Transition Radiation Detector (TRD) and the Time-of-Flight Detector (TOF) is tight and series production of the detector modules must start imminently. Production of the High Momentum Particle Identification Detector (HMPID) is on schedule to be complete by the end of 2004.
§Good progress was reported on the Time Projection Chamber (TPC) and the Committee has no major concerns. Production of the detector is advancing well and a series of system tests are planned for 2004.
§Good technical progress was reported on the Photon Spectrometer (PHOS), the Zero Degree Calorimeters (ZDCs) and the Photon Multiplicity Detector (PMD). However, the Committee expressed its concern regarding the level of available funding for the PHOS. The LHCC noted the progress in the design of forward detectors. Although the design of the detectors is advancing, many details still need to be finalised and the LHCC awaits submission of a common forward detector Technical Design Report by the end of 2004.
§Significant progress was reported on the Dimuon Forward Spectrometer since the previous Comprehensive Review with no major concerns being identified.
§Good progress was reported on the Trigger, Data Acquisition, High-Level Trigger and Controls. The LHCC is reviewing the Technical Design Report and will provide a recommendation at the Committee’s session in May 2004.
§The ALICE software and computing projects are advancing well. The concerns expressed regarding delays in the conditional database and the shortage of manpower for the core software will continue to be monitored.
§ Good progress was reported on the physics issues and the LHCC awaits submission of Volume II of the Physics Performance Report. The Committee encourages ALICE to continue their simulation studies and to present results from a prioritised list of physics channels together with the ALICE physics capabilities for the proton run and for the initial phases of the first Pb-ion run.
LHCC considers that the ALICE experiment is progressing well in the areas of
management and technical coordination structure, integration, installation,
schedule issues and plans for the commissioning and notes that several of the
major sub-systems are either in or are entering their series production phase.
The Collaboration has adopted measures to control increases in the
cost-to-completion. The LHCC took note of the plans for the installation of the
ALICE experiment at Point 2 but noted the risk in schedule delays owing to
possible late completion and installation of some sub-detectors, particularly
the PHOS, TOF and TRD, and the resulting reduction in the time available for
global commissioning of the experiment. The Committee will continue monitoring
developments in these issues.
12. DATES FOR LHCC MEETINGS
Dates for 2004:
30 June - 1 July
- ATLAS Heavy-ion Physics (LHCC 2004-009/I-013).
ATLAS Forward Detector and Luminosity Measurements and Monitoring
- ALICE Comprehensive Review (LHCC 2004-012/G-072)*
* Restricted circulation
Tel. 78949, 164057
LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424