alice cr07: installation and commissioning
DESCRIPTION
ALICE CR07: Installation and Commissioning. Paul Dauncey Material from: L. Leistam: “ALICE Status” W. Riegler: “Commissioning and Installation” K. Safarik: “Strategy for Data-Taking, Alignment and Calibration”. Installation: Recent Progress. Major milestones recently achieved - PowerPoint PPT PresentationTRANSCRIPT
21 Mar 2007 ALICE - Paul Dauncey 1
ALICE CR07: Installation and Commissioning
Paul Dauncey
Material from:
L. Leistam: “ALICE Status”
W. Riegler: “Commissioning and Installation”
K. Safarik: “Strategy for Data-Taking, Alignment and Calibration”
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Installation: Recent Progress• Major milestones recently achieved
• SSD and SDD mounted on ITS frame• ITS frame lowered into pit and inserted
into TPC• Be beam pipe passed through and
connected to absorber
• Current status• Beampipe now in bake-out
•Bake-out period shortened• From 26 to 17 days• Assumes no leaks will be found
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Integration: Constraints W. Riegler
NOW
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• Installation in series means every detector is on the critical path• Every delay counts against the overall ready date
• Delays have built up over the last year• TPC was taken into pit in Mar 2006• Ready for ITS on 1 Feb; at CR06 this was 1 Oct• ITS was actually installed on 15 Mar• ITS delay due to SDD tests; cannot be fixed once installed
• Roughly 5 months delay since CR06, 1 month since Jan LHCC• “Luckily”, LHC schedule delayed by 4 months since CR06• Rest of delay compensated by breaking strict ordering for A-side forward
detectors
• Very little contingency left for planned detector• Would need to move to nights and/or weekends• Or not install some components
Installation: Comments
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• V0, T0: 10-17 Apr• FMD3: 18-26 Apr
Installation: C-side Forward Detectors
• All thee detectors are ready for installation• Procedure tested in full in 2005; confident of this step
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• SPD: 27 Apr – 2 May• Connections: 3-9 May
Installation: SPD, connection to ITS
• Most difficult part; pixel detector needs to be on time
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• FMD2: 8-11 May• Services: 14 May – 7 Jun• TPC movement: 8-13 Jun• Beampipe: 14-21 Jun
Installation: Services, FMD, beampipe
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• PHOS, one module: 22-25 Jun• EMCAL support: 26 Jun – 2 Jul
Installation: PHOS, EMCAL
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• TOF, TRD modules 3-30 Jul
Installation: TOF, TRD
• Adds extra modules to existing installation• Realistically is contingency• End date won’t change even
if start date is later
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• Miniframe: 31 Jul - 5 Sep
Installation: Miniframe
• Schedule Review in Sep recommended bringing this forward• At the expense of installation of other detectors• This recommendation was not taken up
• Critical milestone: carries services for almost all A-sides• No installed detectors can
read out on A-side until miniframe is in place
• LHC vacuum closes after installation; no time to fix anything
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• V0, T0, FMD, PMD: 6-25 Sep• Shielding: 26 Sep – 9 Oct
Installation: A-side Forward Det, Shielding
• A-side forward detectors pushed after beampipe closure to make schedule; no apparent downside
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• Critical: A-sides won’t connect until Sep• Not all services in place yet…• …although scheduled to be by the time the
relevant detectors arrive
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L. Leistam
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L. Leistam
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• Services and power supplies• Services are not complete• CAEN power supplies are a “real concern”; still no real progress
• Space in the pit• Space is extremely tight for people working on the installation of detectors
and services
• Miniframe• Effectively a huge patch panel• Planned by subdetectors semi-independently; no overall plan shown
Commissioning: Issues
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K. Safarik
Estimates 20k events for this
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• Cosmics is an essential step before beam data• Only way to be sure all timing, event building, etc, is right• Otherwise, Nov beam will be used for commissioning, not calibration and
alignment
• Current plan is mainly parasitic running until Oct 10• Installation continuing• Installed detectors run as-and-when ready
• After this, full detector cosmics running can occur• 4 weeks scheduled, roughly half without magnet on, half with magnet on
• Alignment requires ~20k cosmic events in SPD• Rate is ~ 1/min; requires ~14 days• Completely fills allotted time• No spare time for actual commissioning of whole detector readout
Commissioning: Cosmics
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• Installation:• Very significant progress• Whole schedule at risk from delays from all remaining detectors• Accurate up-to-date knowledge of the LHC schedule is essential• Coordination across subdetectors is good and well managed
• Commissioning• Individual subdetectors have done many tests in the lab• Need to increase as centralised activity in the pit• Lack of services, particularly on A-side will be a drawback• Cosmics are a valuable tool but are at risk of being lost as a contingency
buffer for any further schedule delays
• Recommend appointing a “Cosmics Manager”• To plan the cosmics running in detail (like the CMS MTCC)• To make sure it happens and the data are analysed
Conclusions