LARGE HADRON COLLIDER COMMITTEE
Minutes of the forty-eighth meeting held on
Wednesday and Thursday, 4-5 October 2000
2. LHCb Calorimeter Technical Design Report: (LHCC 2000-036 / LHCb TDR 2) J. Lefrancois, A. Schopper
3. LHCb RICH Technical Design Report: (LHCC 2000-037 / LHCb TDR 3) D. Websdale, G. Wilkinson
The minutes of the forty-seventh LHCC meeting (LHCC 2000-034 / LHCC 47) and the LHCC report on the ATLAS Comprehensive Review were approved without modification.
The production of the A128C chip for the Silicon Strip Detector was temporarily stopped in order to investigate the dose due to the various LHC mis-injection scenarios. A radiation-hard version of the chip was developed in parallel, and although the estimated dose remains tolerable, the Collaboration decided to proceed with the development of the radiation-hard version given the extra safety margin and the chip will now be re-submitted early next year. Depending on the results from the ensuing tests by ALICE, production could start in November 2001. According to the revised list of milestones shown, this has resulted in a one-year delay in the sub-detector project but the temporary halt in production does not affect the final schedule. Due to delays in the sensors and front-end chips, an overall delay of about six months in the Silicon Pixel Detector has also been accrued. Although the delay is not expected to affect the final schedule, the ALICE Collaboration is working on a schedule that includes a compression of the production period in order to recover the delay. The referees have asked for an updated list of milestones for the next LHCC meeting. It was reported that the Silicon Drift Detector was progressing well and is on schedule.
Good progress was reported on the design, test programme, integration and simulation studies for the Dimuon Forward Spectrometer since the submission of the Technical Design Report (TDR). The cost of the detector has remained unchanged since the TDR. However, it was noted that the dipole magnet is now on the critical path. The Addendum to the Dimuon Forward Spectrometer TDR, incorporating the design modifications of the third tracking station and the resulting integration and overall detector performance issues, will be submitted in December 2000.
The referees also reviewed the project milestones for the sub-detectors, emphasising those for the PHOS, Inner Tracking System, Dimuon Forward Spectrometer and TOF.
The referees also confirmed the upcoming LHCC reviews of ALICE, which include a status report of the experiment and a presentation on integration issues at the November 2000 Open Session of the Committee and the Comprehensive Review at the January 2001 LHCC meeting.
The referees also reported on the status of the sub-systems and discussed the scheduling and TDR milestones. None of the reported delays appear to be critical but progress of the overall project needs to be monitored. The experiment is still committed to be ready for installation at Point 8 in mid-2004.
The ALICE Memorandum of Understanding has been recently signed and the costs are at present in accord with what has been presented in the TDRs. For ATLAS and CMS, the Committee takes note of the need for more manpower at the collaborating institutes to ensure provision of the agreed deliverables and appreciates the continuing effort by ATLAS and CMS to find new collaborators. A final version of this review will be presented at the next LHCC.
For the CMS solenoid the MAG is fully satisfied with progress on the barrel and end-cap yokes. The final assembly of the former is in progress in surface building SX5 at Point 5 while that for the latter will commence in March 2001. The manufacture of the vacuum tank inner shell is proceeding and the magnetís support feet have been delivered. Good progress was reported for the winding and conductor, although the continuous welding process still needs to be demonstrated. Good progress was also reported for the coil and its assembly. The MAG considers that the project will most likely be within budget but that the overall schedule is tight.
For ATLAS the MAG considers that progress on the inner solenoid magnet is good and notes that it is still on schedule to be the first of the LHC experiment magnets to be ready. The MAG notes that due to the cabling machine problem associated with the conductor, a 12-month delay has been accrued for the end-cap toroid magnets, but that the delay is not yet critical. The first produced section of the barrel toroid magnet, BT1, will be about twelve months late, but ATLAS claims that the whole barrel toroid could still be delivered in time to match the release of the areas by civil engineering. Preparations on the B00 coil, intended for stability tests on the conductors and for commissioning of the test station, are proceeding well, although some minor delays are accruing. ATLAS is rationalising as much as possible in order to offset some of the cost overruns. Finally, it was noted that the overall schedule for the ATLAS barrel is tight.
For the LHCb dipole magnet the MAG considers that the project is proceeding according to schedule and is at present within the budgeted cost.
For the ALICE dipole magnet the MAG noted that the ALICE management re-structured the organisation of the project, leading to a better-defined situation. The MAG also noted that the project is progressing according to schedule.
He also showed the draft machine schedules of the PS and SPS for 2001. Twenty-eight weeks are foreseen for the former, from 2 April to 29 October, while 18 weeks are scheduled for the SPS proton run from 26 June to 29 October. There will be no SPS heavy-ion run in 2001. The SPS supercycle length will change to 16.8 s. and the flat-top will be extended to 5.2 s. Based on these machine schedules, draft schedules of the physics programmes are in preparation for discussion with the users.
Since the approval of the Technical Proposal at the end of 1995, the CMS Collaboration has made very significant progress towards the realisation of an experimental set-up ready to record proton-proton collisions at the LHC in 2005. In particular, all detector technologies to be used, together with the associated electronics, have successfully gone through the R&D phase and construction of the final components has either started or is imminent.
The design and tests of the front-end electronics have in general been successfully completed, although in some cases the transfer of these designs into radiation hard or tolerant technologies has not yet been fully tested. Back-up solutions are, however, being identified in case of unforeseen problems. The Committee notes the very successful development of the APV25 front-end chip for the Tracker.
It is realistic to expect CMS to have a working detector installed in time for the beginning of LHC operation in July 2005, although further detector commissioning and installation is foreseen beyond that date. In particular, the ECAL End-cap and the Preshower at one end of the detector will not be installed in time for the LHC run in 2005. Also, CMS plans to install the Pixel detector only after the LHC commissioning has been completed in order to reduce the risk of damage. Namely, it will be installed during the winter shutdown 2005-2006 to be ready for the 2006 LHC run. Moreover, the Silicon Tracker, and the RPC End-cap layers 2-4 will be installed but only partly commissioned. Finally, the installation and commissioning schedules of TOTEM, either during 2005 or only for the 2006 run, have yet to be decided by the two Collaborations. CMS plans to complete its detector assembly and commissioning during the 2005-2006 LHC shutdown period in time for the 2006 LHC physics run. The LHCC urges the CMS Collaboration to keep to the above schedule.
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 CMS Comprehensive Review.
|RD12 / TTC||Completed. Continue as Common Project.|
|RD18 / CRYSTAL CLEAR||Completed (except for medical applications)|
|RD19 / PIXEL||Completed. Integrated in ALICE|
|RD26 / CSIRICH||Completed. Integrated in ALICE|
|RD39 / SMSD||To continue in 2000 with status report to LHCC.|
|RD42 / Diamond Tracking Detectors||To be completed in 2000 with status report to LHCC.|
|RD45 / Persistent Object Manager||Completed. Transferred to IT Division.|
|RD46 / Liquid Scintillator Tracking||Completed.|
|RD48 / ROSE||Completed.|
|RD49 / RADTOL||Completed. Continue as Common Project (including COTS).|
ALICE: A. Ereditato (Co-ordinator), J. Panman, G. Zech
ATLAS: J. Lee-Franzini (Co-ordinator), J.-J. Gomes-Cadenas, P. Roudeau, K.Tokushuku
CMS: J. Dainton (Co-ordinator), B. Löhr, J. Nash
LHCb: D. Cassel (Co-ordinator), Y. Karyotakis, H. Schellman
MOEDAL: P. Roudeau
TOTEM: H. Schellman
Provisional Dates for 2001:
31 January ó 1 February
21-22 March (revised with respect to original announcement)
LHCC Secretariat: Janet Grant (Bldg. 14/4-022) Tel. 73424 email@example.com