CERN/LHCC 2005-004

                                                                                                                             LHCC 74

                                                                                                                 28 February 2005

                                                                                        
LARGE HADRON COLLIDER COMMITTEE

 

Minutes of the seventy-fourth meeting held on

Wednesday and Thursday, 2-3 February 2005

 

OPEN SESSION:

1. ALICE Status Report: J. Schukraft

2. Report on the 10th Workshop on Electronics for the LHC Experiments: G. Hall

3. RD42 Status Report: H. Kagan

4. MOEDAL Status Report: J. Pinfold

CLOSED SESSION:

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

 

Apologies:   J. Haba, M. Mangano

                                                                                                            *) Part time

 

 

1.       PROCEDURE

The Chairman welcomed the new member M. Martinez-Perez to the Committee and thanked the outgoing member T. Wyatt for his dedication and invaluable help.

The minutes of the seventy-third LHCC meeting (LHCC 2004-033 / LHCC 73) and the report from the LCG Comprehensive Review (LHCC 2004-032 / G-082) 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 and installation of magnets in the LHC tunnel is expected to start in March 2005. The revised LHC machine installation schedules being prepared.

3.    REPORT FROM THE ALICE REFEREES

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

Good progress was reported on various sub-detectors. Problems with the SiO2 passivation for the SPD have been solved, bonding for the SPD has re-started at the firm VTT and the delivered front-end read-out chips for the SDD have an acceptable yield. Integration tests of the ITS and TPC will continue into April 2005. Production of TRD chambers is ongoing. The Production Readiness Review for the TRD read-out electronics is completed with the grounding for the PASA read-out chip remaining as an outstanding issue. Tendering for the TOF FEA read-out boards has started while that for the module production is finished. Dismantling of the dipole muon magnet has started in order for it to be transported to its final position. The Muon Filter is under construction and good progress was reported on the read-out electronics. The liquid circulation system for the HMPID has been built.

The Committee also heard a further report on the refereesÕ reactions to the ALICE Technical Design Report on the Forward Detectors submitted in September 2004 (LHCC 2004-025 / ALICE TDR 011).

The next ALICE Comprehensive Review is scheduled for the March 2005 session of the LHCC. Included in this review will be the electronics schedules of all ALICE detectors and the general ALICE schedule and milestones including a just-in-time list of milestones.

4.    ALICE TECHNICAL DESIGN REPORT ON THE FORWARD DETECTORS

The LHCC has completed its scientific and technical evaluation of the ALICE Technical Design Report on the Forward Detectors Š Forward Multiplicity Detector (FMD), T0 and V0 - submitted in September 2004. The LHCC congratulates the ALICE Collaboration for the work presented in the Technical Design Report.

The Committee has no major concerns. An ancillary document (LHCC 2005-007/G-90) contains items of lesser concern as well as a list of agreed milestones 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 ALICE 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 ALICE Technical Design Report on the Forward Detectors, pending a final cost evaluation. The LHCC considers the schedule given in the Technical Design Report and the list of milestones in the ancillary document to be reasonable. They will be used by the Committee to measure and regulate the future progress of the project.

5.    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.

Good progress was reported on several ATLAS systems. Barrel Toroid 1 (BT-1) and Barrel Toroid 2 (BT-2) have been installed, construction of the Tile Calorimeter is completed and good results were obtained from the Barrel Calorimeter alignment exercise, the SCT Barrel-3 has been assembled and delivered to CERN, the TRT Barrel is close to being completed, the LAr End-cap Calorimeter has been cooled-down and filled and the ATLAS beryllium beampipe is at CERN.

The Committee noted some critical technical issues. Non-conformities were reported on the Barrel Toroid 3 (BT-3) due to degraded ground insulation between the pancake conductor and the coil casing. Transport of the coil to Point 1 has been paused and BT-3 will be installed last and will now be located near the ground connection in the electrical circuit. The last coil will be ready to be installed in the ATLAS cavern in June 2005 as scheduled. The rate for the Pixel module production is ramping-up but the overall production schedule is considered to be critical.

The first three Barrel MDT stations have been installed in their final ATLAS positions in the UX15 underground cavern and construction of the End-cap MDTs is on schedule. Production of TGC chambers is ongoing but the time cycle for production and testing will be shortened in order to advance the completion of all chambers from the current mid-2006 date, which is considered to be late. Manufacture of RPCs is continuing but the previously reported panel delamination problem, most likely due to the poor control of the glue technology, has not yet been resolved. A recovery plan is being implemented with industry but the production of the panels remains critical. Integration and tests of the combined MDT/RPC systems is advancing in building BB5 but delays have been reported due to shortages in RPC units, auxiliary systems, and space and crane logistics. Finally, storage area for muon chambers has been reported and a large number of delicate transports are required in 2005.

Analysis of data collected during the ATLAS Combined Test Beam (CTB) is well-underway. Results will be shown at a dedicated workshop in February 2005 and at the June 2005 ATLAS Physics Workshop, with a view of publication towards the end of the year.

6.    REPORT FROM THE CMS REFEREES

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

The referees reported on the ECAL. Production of crystals at BTCP continues as planned and the delivered crystals are of good quality. The next contract with BTCP is being prepared. Pre-series crystals from SIC have been delivered and are of good quality. Their radiation hardness is improving. The contract with SIC is being placed. The timely production of ECAL crystals remains a risk for the CMS schedule, but the situation is improving. Excellent progress was reported on the ECAL electronics integration and on the Manufacturing Progress Review, at which a team of two LHCC referees participated as external members. Recommendations from the review are being implemented and key components are now off the critical path. Results from the test beam analysis are excellent. Integration work to finish EB+ remains challenging but the team is well-motivated and focused.

The referees also reported on the Tracker. The Tracker has long been on the critical path for completion of CMS by July 2007. Fabrication of the detector has recently incurred delays by the Hybrid electronics at the firm Cicorel and with the Thick sensors at ST Microelectronics. The problem with the poor metal via quality at Cicorel has now been solved and series production is beginning. The production contract at ST Microelectronics has been closed at the end of 2004 and Thick Sensor production has been transferred to Hamamatsu. The quality of the Hamamatsu sensors is good but the production rate is still slightly less than required. However, these delays have resulted in there being no contingency remaining in the Tracker schedule. Recommendations made at the November 2004 Manufacturing Progress Review are being implemented, including the re-organisation of the Tracker Project for the construction and integration phases. A follow-up is proposed for early 2005 in order to review the progress.

The referees reported on the Computing and Physics Studies. Preparation of the Computing Technical Design Report is ongoing and is due in time for the June 2005 session of the LHCC. The Physics Technical Design Report is due at the end of 2005 and will be submitted in two volumes Š Volume I covering detector and software issues, and results from the full analysis while Volume II will deal with the physics reach.

The Committee took note of the CMS schedule. The present CMS Master Schedule (Version 34.1) leads to the start of the Tracker installation on 1 November 2006 and the milestone to close CMS being set to 1 July 2007. However, there is strong pressure to bring forward the ready-to-close milestone.

7.    REPORT FROM THE REVIEW OF COMPUTING RESOURCES FOR THE LHC EXPERIMENTS

The LHCC heard a report on the Review of Computing Resources for the LHC Experiments.

The Review provided a critical examination of the current estimates on computing capacity requirements in terms of disks, tapes, CPUs and networks for the Tier-0, Tier-1 and Tier-2 centres in the light of the presently understood characteristics of the LHC experimental programme. The Review was based on the computing model documents submitted by the LHC experiments at the end of 2004.

The LHCC took note of several issues and concerns. There has been a significant increase in the required computing resources compared to the LHC Computing Review of 2001 with the most significant increase for all experiments being in the amount of the required disk storage. In addition, the experiences from the recent data challenges have provided a foundation for testing the validity of the computing models but tests are at this moment incomplete. There is a concern about the validity of the data analysis components of the computing models and there is a risk that resource requirements for disks and CPUs will increase if the Grid functionality is not properly used.

A report from the Review is in preparation and will include the findings and recommendation. It will include the three main recommendations from the Committee: a) the average and peak computing requirements of the four experiments require further detailed study, b) plans for the distributed analysis during the initial LHC period should be developed, c) the dependence of the computing model on factors such as the raw event size and reconstruction time should be addressed for each experiment, d) details of the ramping-up of the system in the years 2006-2008 should be determined and a plan for the evolution of the required resources should be worked out, e) a complete accounting of the offline computing resources required at CERN is needed for the period 2006-2010, and f) requests for Tier-1 / Tier-2 functionality at CERN should be supported and the associated planning should be refined for the four experiments.

Preparations for the Computing Memorandum of Understanding continue and the Computing Technical Design Reports for the four experiments are due for the June 2005 session of the LHCC.                                                                                                             

8.    REPORT FROM THE LCG REFEREES

The LHCC heard a report from the LCG referees, concentrating on the follow-up to the Comprehensive Review in November 2004.

Conclusions from the gLite Management Task Force include that the first release of the middleware be deployed at major sites by the end of May 2005. This should be in time to be included in the LCG service challenge that must demonstrate full capability in July 2005 prior to providing a stable service in the latter half of 2005. The LHCC took note of the concerns of the experiments since they were not directly involved in the process of the task force. In particular, testing of gLite is needed to ensure that the new software meets the requirements of the experiments. The referees will continue following developments and will report again to the March 2005 session of the LHCC.

Concerns were expressed on CASTOR at the Comprehensive Review because delivery of the new release had been delayed by nine months. Significant effort in the development and testing has been performed over the last few months. Good progress has been made and the CASTOR team is close to deploying the new version.

In response to the Comprehensive Review recommendation for interoperability of the various Grid middleware, good progress has already been made. In particular, the LCG Grid team and the US Grid team have started to explore the technical aspects for interoperability and a committee has been set up to discuss and promote this issue. Several points of collaboration have been identified and real interoperability is considered to be feasible.

9.     REPORT FROM THE RD42 REFEREE

The LHCC heard a report from the RD42 referee on the collaborationÕs programme concerning the development of intrinsically radiation-hard Chemical Vapour Deposition (CVD) diamond devices.

Good progress was reported for the past year. In particular, improvements were reported on the charge collection distance of polycrystalline CVD (pCVD) diamond and good results were shown on the response, charge versus sensor thickness and the transient current measurements been made on single crystal CVD (scCVD) diamond. The Committee also took note of the continuing development of diamond pixel detectors and of applications to beam monitoring and beam abort systems for collider experiments.

The LHCC considers that the proposed research programme for 2005, concentrating on the construction and test of diamond pixel detector modules with the ATLAS and CMS front-end electronic chips, the characterization of higher quality scCVD, continuation of irradiation tests and test of the beam condition monitors for use in collider experiments such as ATLAS and CMS, 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 yearÕs time. The Committee agrees to the continuation of the project on this basis.

10.  REPORT FROM THE TOTEM REFEREE

The LHCC heard a report from the TOTEM referee. The Committee took note of the TOTEM milestones on the Roman Pots and Roman Pot detectors, the T1 CSC detectors and the T2 GEM detectors and of the request for test beam in 2006. Work for preparing the Memorandum of Understanding has started and the preparation of the Letter of Intent together with CMS on diffraction physics is ongoing.

11.   REPORT FROM THE MOEDAL REFEREE

The Committee heard a report from the MOEDAL referee. MOEDAL proposes to identify the signature of monopoles and other highly-ionising particles through a track-etch detector marking a damage zone along the trajectory of the incoming particle. Identification of particles will be made by looking for aligned etch pits in multiple sheets. The MOEDAL detector is proposed to be installed in the LHCb Vertex Locator (VELO) region at Point 8.

The referee reported on the MOEDAL work-plan for 2005-2006. The plan consists of reporting a final design and procedures to the LHCC in June 2005, which will lead to the submission of the Technical Proposal by the end of 2005. Construction of the detector is planned for 2006 with installation scheduled for 2007. Given that the design of the LHCb detector is now complete, the technical design of the MOEDAL detector can now proceed and is to be done in close collaboration with the LHCb Collaboration in the coming months. Studies should be continued on safety issues, testing of material with relativistic heavy-ion beams and simulations of the physics processes. The Committee endorses the plan and encourages the MOEDAL Collaboration to continue developing their experimental design with a view of preparing the Technical Proposal.

12.  TEST BEAMS

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

Dismantling of the former West Area test beam lines is currently underway. The Gamma Irradiation Facility (GIF) continues to operate in stand-alone mode, namely with source only and without particle beams. The former users of the West Area lines need to move to other beam areas such as to the PS East Hall or the SPS North Area.

The Coordinator reported on the ongoing work at the PS and SPS. The consolidation programme is advancing well. Construction of the new CERN Control Centre (CCC), which will bring together under one roof operations hosted previously at the Meyrin Control Room (MCR), the Prevessin Control Room (PCR ), the Technical Control Room (TCR) and the LHC Cryogenics Control Room, is also progressing well. Finally, good progress was reported on preparations of the new ion injector chain for the LHC, with the new Pb27+ sources and electron cooling systems at CERN and with first beam into the Low Energy Ion Ring (LEIR) expected for August 2005 and commissioning of LEIR scheduled for March 2006. Commissioning of ion beams in the PS and SPS machines is scheduled to start in late 2006.

He also presented the first draft schedule for operation of the CERN accelerators in 2006. The schedule is based only on accelerator technical feasibility grounds and input from the user community is requested.


13.  LHCb COMPREHENSIVE REVIEW

The third of the LHCC Comprehensive Reviews of LHCb took place on 31 January Š 1 February 2005. The LHCC referees addressed the following areas: Vertex Locator, Inner Tracker and Trigger Tracker, Outer Tracker, RICH Detectors, Calorimeters, Muon System, Trigger & Physics, Online System & Computing, and the topics of Management, Technical Coordination, Integration, Schedules and Costs.

Since the previous Comprehensive Review in January 2004, the LHCb Collaboration has made very significant progress towards the realisation of an experimental set-up ready to record proton-proton collisions at the LHC. The LHCC expects LHCb to have a working detector installed in time for the beginning of LHC operation in 2007 provided the timely delivery of the sub-detectors and the smooth advancement of the production schedules is ensured.

Detector technologies to be used have successfully gone through the R&D phase and construction of final components is well underway. The Electromagnetic Calorimeter (ECAL) is ready for installation, while the Hadronic Calorimeter (HCAL) is nearly ready for putting in its final position and will meet its installation milestone. Installation of the infrastructure and technical services in the experimental area are well advanced. Issues concerning interference due to the installation of LHC Machine components in the LHCb experimental hall that could potentially cause delays to the LHCb installation are being addressed. The LHCC noted as a concern the delays and resulting tight schedules in the production of the Vertex Locator (VELO), Trigger Tracker, RICH-1, and Muon System.

The principal conclusions and concerns of the LHCC are summarised below. They will allow the Committee to follow up the outstanding issues and to monitor future progress of this project in forthcoming sessions of the LHCC prior to the next LHCb Comprehensive Review one year hence.

-      Good progress was reported on the Inner Tracker and Trigger Tracker. The Committee will continue monitoring the status of sensor delivery and ladder production for the Trigger Tracker as these items are now on the Trigger Tracker critical path.

-      Good progress was reported on the Outer Tracker, with its module production, infrastructure and read-out electronics advancing according to schedule. Studies of ageing effects of the Ar/CO2 gas need to be continued and completed.

-      Much progress was reported on the work in the UX85 experimental cavern. The LHCC considers that although the schedule is tight, it is realistic to expect LHCb to have a working detector installed in time for the beginning of LHC operation in 2007. Installation of the LHC cryogenics line junction in the UX85 cavern has a very strong impact on the overall LHCb installation schedule. Issues related to over-costs in the RICH and Muon System are being dealt within the Resource Review Board.

14.   REFEREES

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

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

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

LCG: F. Forti, P. McBride

15.   DATES FOR LHCC MEETINGS

 

Provisional Dates for 2005:

9-10 March

11-12 May

29-30 June

28-29 September

16-17 November


 

The LHCC received the following documents:

-         RD50 Status Report (LHCC-2004-031/G006)

-         CMS Computing Model (LHCC-2004-035/G83) *

-         LHCb Computing Model (LHCC-2004-036/G84) *

-         ATLAS Computing Model (LHCC-2004-037/G85) *

       ALICE Computing Model (LHCC-2004-038/G86) *

-         RD-42 Status Report (LHCC 2005-003/RD-007)

-         LHCb Comprehensive Review (LHCC 2005-005/G89)*

       Review of the ALICE Forward Detectors: FMD, T0 and V0 TDR (LHCC 2005-007/G90)*

 

                                                                                                 * 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