CERN/LHCC 2005-040

                                                                                                                                                 LHCC 79

                                                                                                                                   15 December 2005

 

LARGE HADRON COLLIDER COMMITTEE

 

Minutes of the seventy-ninth meeting held on

Wednesday and Thursday, 16-17 November 2005

 

OPEN SESSION:

1.      RD50 Status Report: Mara Bruzzi, Michael Moll

2.      RD39 Status Report: Jaakko Haerkoenen, Zheng Li

3.      LHCb Status Report: Tatsuya Nakada

 

CLOSED SESSION:

Present:       S. Bertolucci (Chairman), J.-J. Blaising* (representing D. Schlatter), S. Dauncey, S. de Jong, J. Engelen, M. Gonin, J. Haba, V. Kekelidze, J. Knobloch, R. Mankel, J. Martin, M. Martinez-Perez, P. McBride, C. Niebuhr, B. Peyaud, K. Potter*, C. Rembser, D. Schlatter, E. Tsesmelis (Secretary), R. Yoshida

                                                                                                                              * part-time

Apologies:   S. Dalla Torre, R. Landua, M. Mangano, S. Smith

                                                                                                                                

 

1.     PROCEDURE

The Chairman welcomed the new members R. Mankel and R. Yoshida to the Committee.

The minutes of the seventy-eighth LHCC meeting (LHCC 2005-034 / LHCC 78) and the report from the ATLAS Comprehensive Review (LHCC 2005-033 / LHCC-G-100) were approved.

2.     REPORT FROM THE CHIEF SCIENTIFIC OFFICER

The Chief Scientific Officer (CSO) reported on the LHC Project. Despite technical problems with the transport vehicles, installation of magnets is advancing around the ring. Pressure tests of the first two sub-sectors of the QRL cryogenic line in Sector 8-1 have been successful. The accelerator remains on schedule for collisions in the summer of 2007. The appointment of an LHC Physics Coordinator will be confirmed by the end of January 2006.

The Computing Resources Review Board (C-RRB) met in October 2005 and approved the Memorandum of Understanding for the LHC Computing Grid (LCG), paving the way towards the Worldwide LCG (WLCG). Signatures from the various funding agencies are being solicited, committing the services of the various Tier sites.

3.     REPORT FROM THE ALICE REFEREES

The LHCC heard a report from the ALICE referees, concentrating on the sub-detector progress and the magnetic field mapping of the Dipole and Solenoid magnets.

The Committee heard a report on the general progress of the ALICE experiment. All read-out chambers of the Time Projection Chamber (TPC) have been mounted and production and testing of the front-end electronics is advancing well. Installation of services on the Service Support Wheels (SSWs) of the TPC has started, but some low voltage connectors have been damaged by flux residues and/or excessive temperature, thus delaying completion of the SSW. The delay should, however, not disrupt installation of the front-end electronics. All seven modules of the High Momentum Particle Identification Detector (HMPID) have been built and successfully tested. The Trigger and DAQ prototype for the Muon Spectrometer has been built and is currently under test. The design of the electronics read-out board for the Transition Radiation Detector (TRD) has been finalised and production has started after resolving the grounding problems with the PASA chip. Good progress was reported with the Time-of-Flight (TOF) detector, with 30% of the strip construction completed, module assembly having started, and the HPTDC electronics production and tests finished. The cradle for the PHOS calorimeter is ready to be installed in the experiment, but has been pushed back to July 2006 due to lack of funds. Pre-installation of the Trigger/DAQ sub-system for the TPC is being installed at Point 2. Construction of the second proton calorimeter for the Zero Degree Calorimeter (ZDC) is finished.

The Committee noted delays in the Inner Tracking System (ITS) related to the Silicon Drift Detector (SDD). Assembly of 50% of SDD modules has been shifted from October 2005 to February 2006. As SDD ladder production has only just started, it will take some time to establish the required production rate. The LHCC will review progress again at its next session, including a revision of the SDD schedule in order for the project to meet its installation milestone.

Final commissioning of the Dipole Magnet and field measurements together with the Solenoid Magnet have been completed. Systematic differences between the expected and measured values are attributed to the misalignment of the sensors with respect to the measurement coordinate frame. Analysis is on-going with the aim of providing a field map for the ALICE simulation and reconstruction.

4.     REPORT FROM THE ATLAS REFEREES

The LHCC heard a report from the ATLAS referees, concentrating on the general progress of the experiment and progress with sub-systems.

Excellent progress was reported on the installation of large sub-systems in ATLAS at Point 1. The Barrel Calorimeters and Solenoid Magnet are in their final position and installation of the LAr and Tile End-cap Calorimeters (Side C) has started. Assembly of the End-cap Toroid (Side A) is approaching completion.

The referees also reported on the Inner Detector. Recovery from the Pixel cooling pipe corrosion problem is proceeding well and stave loadings are to resume imminently. The revised Ready-for-Installation milestone of February 2007 is expected to be met, and the LHCC will review the recovery procedure and schedule by its next session. Leaks were reported on the barrel Transition Radiation Tracker (TRT) cooling manifolds. The repair procedure is to be reviewed and the impact of the leaks on the Barrel Semiconductor Tracker (SCT) and TRT integration schedule is to be reviewed. The Committee will continue monitoring developments in this area. Installation of services on the Inner Detector is progressing.

The Committee heard a report on the Calorimeters. Production of the front-end electronics boards for the LAr Calorimeter is advancing well. Lingering problems with the low voltage power supplies (failing elements) and with the high voltage power supplies (failure rate) were reported. Possible solutions are under investigation and the impact of the problems on the LAr Calorimeter schedule is being evaluated. Procurement of trigger cables for the Tile Calorimeter is being ramped-up with the addition of new suppliers. The reported stability problems with the front-end electronics and high voltage power supplies for the Tile Calorimeter are being investigated, while installation of the low voltage power supplies has been delayed due to the lack of ELMB motherboards. The noise in the Tile Calorimeter fLVPS low voltage power supplies has been measured to be larger than the baseline commercial (switching) supplies and an investigation of the noise is ongoing.

The LHCC heard a report on the Muon System. Production of chambers is progressing well with no major problems having been identified. However, some critical issues with the chamber assembly remain and are related to the assembly rate and procedures, procurement of elements and the overall schedule.

Good progress was reported on the Trigger/DAQ system. All ASIC electronics have been produced, delivered and tested. Tight schedules for the on-detector calorimeter and muon triggers were reported. Large-scale tests of the DAQ and Higher-Level Trigger are progressing well and are driven by the on-going commissioning effort of the ATLAS experiment.

Good progress was reported on the Service Challenge 3, which included a successful Tier 0 ?Ĭ Tier 1 exercise at the 10% scale.

5.     REPORT FROM THE CMS REFEREES

The LHCC heard a report from the CMS referees, concentrating on the status of the detector construction, preparation of the underground areas and of the magnet/cosmic tests on the surface, and the overall schedule.

Good progress was reported on the Tracker. All sensors, hybrid electronics and Tracker Inner Barrel (TIB) modules have been completed. Production of the Tracker Outer Barrel (TOB) and Tracker End Cap (TEC) modules is well underway. The Tracker Integration Facility (TIF) was handed-over to CMS on schedule and work on the TEC will commence shortly. The recent CMS review of the Forward Pixel concluded that the project is making very good progress.

The referees also reported on the Electromagnetic Calorimeter (ECAL). Re-working of manifolds to cure the unreliability of welds to the cooling blocks is advancing well. The prototype solution has been validated and pre-series production is underway. The ECAL schedule remains unchanged and it includes installation of the ECAL Barrel EB+ on the surface following the magnet test, albeit with no contingency in the associated schedule, and up to four EB- Supermodules to be inserted after the Tracker installation.

Good progress was reported on the Hadron Calorimeter (HCAL). Source calibrations of the various calorimeters comprising the HCAL are either complete or well-advanced and the HCAL Barrel will be moved out of the alcoves early next year in preparation for insertion in to the vacuum tank.

The LHCC heard a report on the Muon System. Continued good progress on the construction and installation of chambers was reported. The major issue of concern is related to the cabling campaign, where a multi-shift, multi-team operation is now needed to meet the schedule.

The referees also reported on the magnet and cosmic tests on the surface. The reported delays now mean that the window for these tests has been moved back to the period from March to June 2006. The LHCC considers that the tests are important and should not be compromised since the experience to be gained on the surface is vital. The Committee will review preparations for these tests at its next session.

Good progress was also reported on the CPT Project, comprising the Computing and Core Software, the Physics Reconstruction and Selection, and the TriDAS Online Software. The project will be reviewed in further detail at the Committee?Ĵs next session.

The Committee also heard a report on preparations in the underground caverns. Milestones for the USC55 service cavern are being met and work in the UXC55 experiment cavern is now moving onto the critical path, with preparations for the cable chains, pulling of cables and the floor plates still to be done. The LHCC considers it important to meet the heavy-lowering window of June to December 2005.

The Committee took note that a revised CMS Master Schedule Version 34.3 is under preparation and should be available in December 2006. Version 34.3 will include a revision to the sequence and duration of operations taking into account the latest information on the sub-systems and will have the same ready-for-closing date of 15 June 2007 as the previous version. The schedule remains very tight and challenging, but not impossible.                                                                                                                                                  

6.   REPORT FROM THE LHCb REFEREES

The LHCC heard a report from the LHCb referees, concentrating on the construction status of the sub-systems, preparations for data-taking and the review of the Addendum to the Online System Technical Design Report.

The referees reported on the interface issues with the LHC Machine QRL cryogenic line in the Point 8 experimental area. The QRL installation in the area is complete and the scaffolding has been removed. The delay in the QRL installation work has set back the LHCb installation schedule by three months and a revised LHCb schedule is in preparation. QRL cooling tests are scheduled for the end of November 2005 and will affect the LHCb work during the cool-down time. Continued good communication between LHCb and the LHC Machine Project will be required in the future.

Good progress was reported on the experimental beam pipe and on the Dipole Magnet. First measurements of the Dipole Magnet were made in June 2005 and by the end of 2005, a complete field mapping with all the iron structures in place will be done.

The Committee heard a report on the various sub-detectors. The quality of the delivered sensors for the Vertex Locator (VELO) is good but the rate of delivery remains a concern. The start of the VELO module production has been delayed by five months but is now set to start in December 2005. The corresponding production facility is well-prepared but the overall schedule is very tight. Progress was reported on the Ring Imaging Cherenkov detectors RICH-1 and RICH-2. The production schedule for the eight spherical beryllium mirrors for RICH-1 is very tight, the RICH-2 detector is being transported to Point 8 and the production rate of the Hybrid Pixel Detectors (HPDs) read-out is approaching the nominal rate. Good progress was reported on the Inner Tracker, Trigger Tracker and Outer Tracker. However, series production of the Inner Tracker ladders has been put on hold due to problems with the bonding to the pitch adapter. Solutions are being investigated. The Electromagnetic and Hadronic Calorimeters have been installed in the experimental cavern and development of the read-out electronics is advancing well. About half of the Muon System chambers have been produced and the fabrication is now advancing steadily at all centres, but delays incurred at the beginning of the production have not been recovered. The dressing and testing of chambers with the final electronics are now on the critical path.

The LHCC took note of the preparations for the LHCb data-taking phase. A Commissioning Task Force has been created and a new physics organization has been put in place.

The next LHCb Comprehensive Review will be held on 13-14 February 2006.

7.     LHCb ADDENDUM TO THE ONLINE SYSTEM TDR

The LHCC has completed its scientific and technical evaluation of the LHCb Addendum to the Online System Technical Design Report. The Addendum describes the configuration of the read-out of all detector components with a trigger Level-0 rate of 1 MHz by combining the Level-1 Trigger and the High-Level Trigger (HLT) to one software trigger level. The LHCC finds the system architecture proposed for the Online System adequate to achieve the physics goals stated in the Technical Proposal and congratulates the LHCb Collaboration for the work presented in the Addendum to the Online System Technical Design Report.

The Committee has no major concerns. An ancillary document (LHCC 2005-042/G-103) 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.

Recommendation

The LHCC recommends general approval of the LHCb Addendum to the Online System Technical Design Report. The LHCC considers the schedule and milestones given in the Addendum to be reasonable. They will be used by the Committee to measure and regulate the future progress of the project.

8.     REPORT FROM THE LHCf REFEREES

The LHCC heard an intermediate report from the LHCf referees on answers to issues raised by the Committee concerning the LHCf Technical Proposal. Contacts with the ATLAS Collaboration and with the LHC Machine Project have been established and many questions have been answered since the last LHCC session. Presently, there is no show stopper but a number of issues need to be clarified. Following further discussions with the LHCf Collaboration, the referees will make a detailed presentation at the next session of the LHCC.

9.     REPORT FROM THE RD39 REFEREE

The LHCC heard a report from the RD39 referee on the collaboration?Ĵs 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. In particular, progress was reported on the cryogenic operation of silicon devices and on the modeling of cryogenic silicon device operation.

The LHCC considers that the proposed work plan for 2006, concentrating on the study of Charge Collection Efficiency (CCE) measurements, modeling of the electric field and trap centres, the operation of Charge Injection Devices (CIDs) at cryogenic temperatures and continued investigations of edge-less sensors, 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 2006. A status report is expected to be submitted to the LHCC in one year?Ĵs time. The Committee agrees to the continuation of the project on this basis.

10.   REPORT FROM THE RD50 REFEREE

          The LHCC heard a report from the RD50 referee on the collaboration?Ĵs 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 the development of devices such as Czochralski silicon, oxygenated p-type silicon, epitaxial silicon and 3D silicon for use in a high-fluence environment. 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 2006 across all areas ?Ĭ 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 2006. A status report is expected to be submitted to the LHCC in one year?Ĵs time. The Committee agrees to the continuation of the project on this basis.

11. TEST BEAMS

The SPS and PS Coordinator reported on the test beams. User requests for beam time in 2006 at the PS Complex and at the SPS were received from 30 different groups, with the majority coming from LHC-related activities. The respective 2006 fixed-target programmes are being drawn-up and will be reported to the next session of the Committee.

12.   LCG PROJECT COMPRHENSIVE 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 Grid development project and it relies on other Grid projects for the middleware development and support.

The LHCC considers that the LCG Project has shown significant progress since the last Comprehensive Review. In particular, the Service Challenges have been successful, albeit with a lower-than-expected through-put, the Grid middleware quality and stability and the interoperability between the various middleware systems on a small scale have improved, the Baseline Services have been defined and more focus has been put on practical aims matched to the requirements of the experiments. The associated LCG Technical Design Report was submitted in June 2005 and reviewed by the LHCC in October 2005 and the Computing Memorandum of Understanding was approved by the corresponding Resource Review Board in October 2005.

However, the Committee did note certain concerns. The connection between the middleware and the experiments is considered to be too weak, with the risk that the former will not satisfy the requirements of the experiments. Moreover, significant delays were reported in the deployment of the Enabling Grids for e-Science in Europe (EGEE) gLite services, in the CASTOR2 disk pool management system and in the distributed database services. The interoperability and the provision of a common interface of the various types of middleware being produced should continue to be pursued at a larger scale. The analysis models are to a large extent untested and the database service deployment is late.

The third annual LHCC Comprehensive Review of the LCG Project took place on 14-15 November 2005. The LHCC referees addressed the following areas: Overview and Global Collaboration, Applications Area, Fabric Area, Grid Deployment Area, Service Challenges, and the issues of Management and Resources. 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.

??     Good progress was reported on moving towards the Worldwide LCG, with the interoperability of various Grid middleware improving markedly, but much work remains to be done. Challenges have been identified for 2006 and will be monitored by the LHCC.

??     Significant progress was reported on the Applications Area, with no major concerns having been identified. Measures have been taken to stabilize the decreasing level of manpower effort in the Applications Area.

??     The LHCC notes the significant progress in the Fabric Area. However, the Committee expressed concern on the reported delays related to CASTOR2, and will continue checking on the availability and performance of this system.

??     Progress was reported on the Grid Deployment Area, particularly in the fields of Grid Operation and Baseline Services. The deployment of some components of the gLite middleware is very late. Continuing work on the interoperability of the various Grid systems is required.

??     The latest Service Challenge 3 provided the LCG Project, computing sites and the experiments with much-needed experience prior to LHC operation in 2007. The lower-than-expected through-put observed in Service Challenge 3 and the associated problems encountered need to be addressed.

A great deal of progress was reported since the previous LCG Comprehensive Review in November 2004. The organization structure has been adapted to the changing needs of going from the development to the service phase, and resources are being put together.

13.   REFEREES

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

ALICE: P. Dauncey, M. Gonin, J. Haba (Co-ordinator)

ATLAS: F. Forti, V. Kekelidze (Co-ordinator), R. Landua, M. Martinez-Perez

CMS: S. de Jong, R. Mankel, S. Smith (Co-ordinator), R. Yoshida

LHCb: S. Dalla Torre, C. Niebuhr, B. Peyaud (Co-ordinator)

TOTEM: S. Dalla Torre

MOEDAL: B. Peyaud

LHCf: M. Mangano, C. Niebuhr

RD39: S. de Jong

RD42: V. Kekelidze

RD50:  R. Yoshida

LCG: P. Dauncey, F. Forti (Co-ordinator), R. Mankel, M. Martinez-Perez

 

 

 

 

 

 

14.   DATES FOR LHCC MEETINGS

 

Provisional Dates for 2006:

15-16 February

22-23 March

10-11 May

28-29 June

27-28 September

15-16 November

 

The LHCC received the following documents:

- Addendum to the LHCb Online System TDR (LHCC-2005-039/TDR 7 Add. 1)*

- LCG Project Comprehensive Review (LHCC-2005-041/G-102)*

 

* restricted circulation

 

 

 

 

 

                                                                            Emmanuel Tsesmelis

                                                                            E?Ĭmail:    LHCC.Secretary@CERN.CH

                                                                            Tel. 78949, 164057

 

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

                                       janet.grant@cern.ch