CERN/LHCC 2004-033
LHCC 73
25 November 2004


LARGE HADRON COLLIDER COMMITTEE

 

Minutes of the seventy-third meeting held on

Wednesday and Thursday, 24-25 November 2004

 

OPEN SESSION:

1. LHCb Status Report: T. Nakada

2. LHCb Test Beam Report: A. Golutvin

3. RD39 Status Report: J. Haerkoenen, Z. Li

4. RD50 Status Report: M. Moll

CLOSED SESSION:

Present:       S. Bertolucci (Chairman), K. Borras, D. Boutigny*, J. Engelen, J. Feltesse, F. Forti, V. Guelzow*, J. Haba, M. Hauschild,
S. de Jong, V. Kekelidze, J. Knobloch, M. Mangano, J. Martin, M. Martinez, P. McBride, C. Niebuhr, B. Peyaud, K. Potter,
D. Schlatter, S. Smith, E. Tsesmelis (Secretary), C. Vallée, T. Wyatt

 

                                                                                                            *) Part time

 

 

1.       PROCEDURE

The Chairman welcomed the new member M. Martinez to the Committee.

The minutes of the seventy-second LHCC meeting (LHCC 2004-027 / LHCC 72) and the report from the CMS Comprehensive Review (LHCC 2004-028 / G-080) were approved without modification.

2.       REPORT FROM THE CHIEF SCIENTIFIC OFFICER

The Chief Scientific Officer (CSO) reported on the status of the LHC Project. Installation of the QRL cryoline has restarted. The revised LHC machine installation schedule will be available in January 2005. Meetings between representatives from the LHC machine and experiments will be re-instigated imminently. Discussions for the second phase of the LHC Computing Grid Project covering the period 2006-2008 are currently underway with the Funding Agencies.

3.   REPORT FROM THE ALICE REFEREES

The LHCC heard a report from the ALICE referees, concentrating on the general status of the detector construction, on the Physics Performance Report and the Forward Detectors Technical Design Report.

Good progress was reported on the TPC, TRD, Dimuon Forward Spectrometer, TOF, HMPID, PMD and Trigger/DAQ/DCS sub-systems. Assembly and powering to full current of the muon dipole magnet have been completed successfully at its temporary position. The referees also presented the production schedules of the main electronics components of the TPC, TOF, Dimuon Forward Spectrometer and TRD detectors, showing that the electronics for the TPC and TOF detector are well-advanced while further information is requested for the Dimuon Forward Spectrometer and the TRD. The Committee will review the electronics schedules of all detectors at the next ALICE Comprehensive Review.

The referees reported on the Inner Tracking System (ITS) status. Solutions for difficulties with the Silicon Pixel Detector (SPD) sensor wafers, the aluminium/polyimide pixel bus and the MCM electronics substrate are being worked out and should be finalised by the end of November 2004. The difficulties have, however, resulted in additional delays to the assembly of the half-staves. Sensor production for the Silicon Drift Detector (SDD) is progressing and the SDD module production is starting. However, the required tooling for the ladder assembly will only be available in February 2005. Module production for the Silicon Strip Detector (SSD) is ramping up but ladder assembly has also not yet started. The Committee is concerned about the delays observed in starting the assembly of the ITS ladders, particularly since the commissioning of the assembly procedures might take several more months to complete. The LHCC took note of the successful ITS combined beam tests within the ALICE central DAQ framework and will continue monitoring the progress of the ITS.

The referees presented an outline of the ALICE Physics Performance Report (PPR) Volume II. This second volume will present the reconstruction and physics performance of the ALICE experiment. The submission date is to be agreed.

The Committee heard a further report on the referees’ preliminary reactions to the ALICE Forward Detectors Technical Design Report submitted in September 2004 (LHCC 2004-025 / ALICE TDR 011). The Committee will continue reviewing the ALICE Forward Detectors Technical Design Report and following additional questions and discussions, the referees will make a full report at an upcoming meeting of the LHCC.

4.   REPORT FROM THE ATLAS REFEREES

The LHCC heard a report from the ATLAS referees, concentrating on the general progress and the status of the detector construction.

The LHCC took note of the good progress in the ATLAS magnet system. The first Barrel Toroid (BT-1) was installed in the ATLAS underground cavern in November 2004. A welding incident on BT-4 has caused a 3-week delay in the completion of this module but its final installation is expected to be on schedule. All 16 coils for both End-cap Toroids (ECTs) are wound and 14 of them have been impregnated. Both ECT vacuum vessels are at CERN and assembly of the first ECT will be done in Hall 191, on schedule for completion in Spring 2005.

The common cryostat for the Barrel LAr EM Calorimeter and solenoid magnet was installed in the ATLAS underground cavern in October 2004. Good progress was reported on the LAr End-caps, the Tile Calorimeter and the FCAL.

The referees also reported on the status of the electronics. All of the ASIC front-end electronics have been produced except the Pixel FEI, the RPC CMA and the TGC SLB. The delays in the latter three components are considered to be critical and the Committee will continue monitoring progress. Furthermore, the jitter on a fraction of the QPLL electronics, a PLL driven by a crystal oscillator to filter the jitter on the clock delivered by the TTCrx board, is outside the specification and it was noted that validation of the radiation hardness of the voltage regulators has not yet been carried-out.

Progress was reported on the Inner Detector comprising the Pixel Detector, SCT, and TRT. However, the referees reiterated that the result of the past difficulties is that the schedule for the Inner Detector remains a concern as there is no float left in the installation schedule.

The referees also reported on the Muon System. MDT production is progressing while that for the CSCs is complete. Production of TGCs is advancing as scheduled with that in Japan and China now complete. Production of RPCs has slowed-down due to problems with delamination of the honeycomb panels and the LHCC also noted the slow rate of integrating Barrel MDT chambers with RPCs. The Committee considers the delays in the Muon system to be the most critical.

The LHCC also took note of progress in the ATLAS Computing project and the new ATLAS Installation Schedule Version 6.24, which is a working version not yet baselined and which has ATLAS ready for beam on 1 March 2007.

5.     REPORT FROM THE CMS REFEREES

The LHCC heard a report from the CMS referees, concentrating on the status of the ECAL, Tracker and Muon projects.

The referees reported on the ECAL. Crystal production at BCTP has re-started and is advancing well while production at the second supplier SIC is in the pre-series phase. Discussions are underway with both suppliers to prepare the respective contracts. The biggest risk to the ECAL schedule lies with the delivery of the crystals, and the schedule based on the tender offers fulfills the CMS Master Schedule V34 which has three-to-five Supermodules inserted after the Tracker installation in November 2006 and the ECAL End-cap Dees installed in time for the 2008 LHC run. All components of the read-out electronics (ASICs and front-end boards) are being delivered on schedule. The first ECAL Barrel Supermodule was successfully integrated and tested in H4. Preliminary results show an excellent performance in terms of energy resolution and noise characteristics.

The referees also reported on the Tracker. Since the Comprehensive Review in September 2004, much progress was reported on understanding the ingredients needed to produce a credible schedule. The plan appears to be coherent and the processes, times-scales and resources have been studied and exercised in depth. However, the LHCC cannot properly assess the robustness of the schedule until mass production of modules is well underway as the Tracker production depends upon the sustained availability and quality of the components. The LHCC noted the improved quality assurance and quality control for the hybrid substrates but reiterated that good hybrid delivery remains a critical point and that there is very little contingency left in the module production schedule. The LHCC will again review progress in January 2005.

The LHCC also heard a report on the Muon System. Production, installation and cabling of DT chambers continues, albeit at a just-in-time rate. Problems with the availability of HV boards and MINICRATE electronics modules have caused further delays, resulting in just-in-time delivery of these components. Owing to the complexity and multi-site production of the DT chambers and their components, the Committee considers that there is an urgent need for closer scrutiny and detailed optimization and planning of manpower and parts flow to meet the installation milestones. Moreover, a plan for the testing and monitoring performance of installed DT/RPC packages is requested by the LHCC.

6.     REPORT FROM THE LHCb REFEREES

The LHCC heard a report from the LHCb referees, concentrating on the general status of the experiment and the milestones.

The referees reported on the status of the sub-systems. Good progress, albeit with a tight schedule, was reported on the Tracker, which consists of the Vertex Locator, Trigger Tracker, Inner Tracker and Outer Tracker. The Trigger Tracker sensor production schedule is under evaluation given the potential conflicts with those for CMS at the same producer while module production for the Outer Tracker continues to be delayed. Good progress was also reported on the RICH and Calorimeter System. Six pre-production HPDs for the RICH were studied in beam tests but problems in the their production have resulted in further delays. A new schedule will be available early in 2005 and the LHCC will use it to monitor the progress. The Committee expressed concern at the production of the Muon System chambers. Several months of delays were reported and not all institutes have reached the nominal production rate. A revised schedule will only be available when all institutes have reached the nominal production rate. The LHCC will follow the progress closely.

The Committee took note of the use of J/y and D0 events for detector calibration and use to address certain physics topics. The inclusion of such events in the LHCb read-out scheme has a large impact on the computing requirements, which are to be described in the upcoming Computing Technical Design Report.

The Committee also took note of the LHCb milestones. Good progress is visible but in some areas the schedule remains tight.

       The next LHCC Comprehensive Review of the LHCb experiment is scheduled for 31 January and 1 February 2005.                                                

 7.   REPORT FROM THE RD39 REFEREE

The LHCC heard a report from the RD39 referee on the collaboration’s programme concerning the operation of solid-state detectors at low temperatures and in a high radiation environment. The referee summarized the experimental results that RD39 has achieved on the development of such detectors and also described the proposed programme for future work.

The Committee took note of the good progress in the study of such cryogenic devices for applications in future high energy physics experiments. Although the agreed work-plan for 2004 has not yet been completed, good progress in the understanding of the cryogenic operation of silicon devices and APDs were reported providing promising detector techniques for an upgraded high luminosity LHC.

The LHCC considers that the proposed work plan for 2005, concentrating on completing the ongoing work plan, on the optimization of Deep Level spectra by Charge Injection Devices pre-irradiated and intentionally contaminated and on measurements of the charge collection efficiency of Charge Injection Devices pre-irradiated by protons and neutrons, to be reasonable.

In view of the above and given the modest request for resources for further work, the referee recommends that the R&D project be continued in 2005. A status report is expected to be submitted to the LHCC in one year’s time. The Committee agrees to the continuation of the project on this basis.

8.     REPORT FROM THE RD50 REFEREE

The LHCC heard a report from the RD50 referee on the collaboration’s programme concerning the development of radiation hard semiconductor devices for very high luminosity colliders. The referee summarized the experimental results that RD50 has achieved on the development of such detectors and also described the proposed programme for future work.

The Committee took note of the good progress in the study of such semiconductor devices for applications in future high energy physics experiments such as those at an upgraded LHC. Progress was shown in understanding defects and in developing n-in-p and epitaxial Si devices. Furthermore, masks made for mini-strips and mini-pixel detectors will allow testing of several options with real detectors. The RD50 Collaboration is also developing methods to simplify the manufacturing process for the industrialization of 3D detectors. However, studies of new materials such as SiC and Si dimers have shown only a 20% charge collection efficiency in the former case and destruction of the material in the latter case. The Committee considers that the development of the associated read-out electronics should proceed in parallel with the sensor devices.

The LHCC considers that the proposed work plan for 2005 across all areas – defect and material characterization, defect engineering, pad detector characterization, new materials, new structure and full detector systems - to be reasonable.

In view of the above and given the modest request for resources for further work, the referee recommends that the R&D project be continued in 2005. A status report is expected to be submitted to the LHCC in one year’s time. The Committee agrees to the continuation of the project on this basis.

9.    TOTEM STATUS REPORT

The LHCC heard a report from the TOTEM referee, concentrating on beam tests at the SPS and progress in the discussions on diffractive physics with CMS.

Beam tests at the SPS were performed both at SPS LSS5 and at the X5 beamline of the West Area. Prototypes of the three detector types – CSCs for the T1 telescope, GEMs for the T2 telescope and silicon devices for the Roman Pot stations – have been produced and operated successfully in beam. Tests at LSS5 focused on measurements of the RF background and on tests of planar silicon detectors with guard rings and with a 3D active edge while the performance of all detector types were studied at X5. The experience gained from the tests in 2004 is being used in the design of the final TOTEM detectors.

10.  TEST BEAMS

The SPS and PS Physics Coordinator gave a report on the status of CERN’s accelerator complex and on the LHC test beams.

The SPS and PS proton period since September was characterized by no major problems with the accelerators and included successful runs with the LHC bunch structure and a 158 GeV low-energy run for NA60. The LHCC took note of the very successful beam tests and irradiations by the LHC experiments and of machine development periods, including studies on LHC scrubbing, tests of the TI8 extraction to the LHC and LHC collimator and material investigations. Despite problems with the accelerator chain in the earlier part of 2004 run, the LHC test beam users were able to complete their test beam programmes. The SPS and PS runs for 2004 were completed on 15 November and there will be no beams at the SPS and PS (except in the PS Booster) in 2005.

As the SPS extraction in to the West Area is incompatible with the LHC extraction and after more than twenty-five years of operation, the SPS West Area is being dismantled. The space will be occupied by the LHC Project. The Gamma Irradiation Facility (GIF) in the West Hall will continue to be used in stand-alone mode, namely with the photon source but without particle beams.

The LHCC took note of the plans of the experiments for the current shutdown period and the requests for test beams in 2006.

11. LHC COMPUTING GRID PROJECT COMPREHENSIVE REVIEW

The LHC Computing Grid (LCG) Project was created by the CERN Council in September 2001 with the aim of prototyping and deploying the computing environment for the LHC experiments. The formal launch of the project was at a workshop held in March 2002. Since that time, the LCG Project has demonstrated progress towards the realisation of the computing requirements of the experiments in time for LHC operation in 2007.

The LCG Project is a collaboration of the LHC experiments, the Regional Computing Centres, CERN and the physics institutes with the aim of preparing and deploying the computing environment that will be used by the LHC experiments to analyse the LHC data. The project includes support for applications and the development and operation of a computing service.

The LCG Project is divided into two phases. Phase I (2002-2005) has the objective of building a service prototype, based on existing Grid middleware, of running a production Grid service and producing the Technical Design Report for the final system. Phase II (2006-2008) will build and commission the initial LHC computing environment. The LCG is not a development project and it relies on other Grid projects for the middleware development and support.

The LHCC considers that the LCG Project has shown progress since the last Comprehensive Review. In particular, the LCG-2 middleware has been deployed at around 90 remote sites and used in the Data Challenges 2004, a new middleware development - gLite (Lightweight Middleware for Grid Computing) - has been launched under the Enabling Grids for e-Science in Europe (EGEE) initiative, a well-defined set of tools for the Fabric Area and Wide Area Networking has been chosen, and all projects in the Applications Area have demonstrated significant steps in the development and production of their respective products and services.

However, the Committee did note certain concerns. The service provided by LCG-2 for the Data Challenges was much less than production quality. The connection between LCG, gLite and the experiments is considered to be too weak, with the risk that the middleware will not satisfy the requirements of the experiments. Moreover, significant delays were reported in the release of the EGEE gLite services and in the CASTOR disk pool management system. Continued delays in gLite may hinder future progress in ARDA (A Realization of Distributed Analysis for the LHC). The interoperability and the provision of a common interface of the various types of middleware being produced should be pursued.

The second annual LHCC Comprehensive Review of the LCG Project took place on 22-23 November 2004. The LHCC referees addressed the following areas: Status Update, Management and Planning; Middleware and Interaction with EDG/EGEE and other Developments in Middleware; Fabric Area and Wide Area Networking; Grid Deployment and Regional Centres; Applications Area. The LHCC acknowledges the considerable amount of work that has gone into the preparation of the LCG Project Comprehensive Review.

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 LCG Project Comprehensive Review one year hence.



12. REFEREES

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

ALICE: P. Dauncey, J. Haba, C. Vallée (Co-ordinator)

ATLAS: F. Forti, V. Kekelidze (Co-ordinator), T. Wyatt

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. Vallée

LCG: F. Forti, P. McBride, T. Wyatt

13. DATES FOR LHCC MEETINGS

 

Provisional Dates for 2005:

2-3 February

9-10 March

11-12 May

29-30 June

28-29 September

16-17 November

 

The LHCC received the following documents:

 

* 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