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Experimental Beampipes: Status and Outlook

This document provides updates on the status of beampipe installations in various experiments at CERN, including activities, major installations, and future plans.

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Experimental Beampipes: Status and Outlook

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  1. Experimental Beampipes:Status and Outlook Ray Veness / AT-VAC For the beampipe team With many thanks to the experiment’s installation and coordination teams

  2. Contents • Last update to LEMIC in October 07 • ATLAS central section installations • VAX zones • Recent activities • Major installations in ATLAS and CMS • Looking forward • Access to chambers for NEG activation or removal • Consolidation activities • AT-VAC structure • Summary Beampipe Status - R.Veness

  3. ATLAS:Lab activities • LUCID Integration • Both LUCID detectors have been integrated in between the VJ chamber and support by the LUCID/VAC team • VJ assemblies ready for installation in B.927 • Bakeout test (Jan ’08) • Half-length of ATLAS, fully NEG-coated, comprised of reserve chambers and supports • Tested NEG activation procedure, bakeout performance and support displacements due to thermal expansion • Also tested thermal load on LUCID with cooling during bakeout • No problems seen Integration of LUCID onto VJ in B.927 Beampipe Status - R.Veness Bakeout test in B.927

  4. VJ installation test (Jan ’08) VJ assembly with dummy LUCID was installed in the cavern Initial leak problems with TAS seal disappeared after few days Envelope conflicts discovered with forward shielding – being resolved Gas Injection System Table + Injection Line + Pumping Line are all installed and being commissioned baking, test of all instrumentation and connection to PVSS – Should be completed tomorrow ATLAS: Cavern activities VJ reserve chamber installed in ATLAS Beampipe Status - R.Veness

  5. ATLAS: Cavern Activities (2) • Bakeout heater testing (in progess) • ATLAS bakeout jackets integrated into chambers • Permanent cabling down to cavern racks • detector closed during first bakeout, so no access to heaters • Tests to verify heater and thermocouple connections before endcap closure • Also test interlocks with PIXEL thermal control system • Remaining activities • Closing of endcaps around chambers • VT and VJ chambers (installation and test) plus final commissioning • 38 days of VAC activities before ready-for-beam (2 July by current schedule) VA chamber installed in ATLAS Beampipe Status - R.Veness

  6. ALICE • RB24 installation • RB24 (non-experimental side) chambers and supports are being installed • ALICE final commissioning • RB 24 NEG activation week 21 (19/5) • ALICE ultra-pure gas pumping week 22 (26/5) Beampipe Status - R.Veness

  7. CMS:Lab Activities • Reserve chambers ready and NEG coated: • Central pipe (stainless steel) • HF/CT2 (NEG coating in progress) • Forward pipe • NO SPARE for End-cap pipe • Installation tooling • Lifting beams and installation tooling all ready (and now in use!) • Common Be spare section • The prototype 1m long x 58mm ID beryllium chamber has been re-fitted as a spare • Stainless steel ends allow for the assembly at CERN of a spare for ALICE, ATLAS or CMS central pipes- these additional pieces have not been made • Status: Delivered to CERN, acceptance tests complete, in storage Beampipe Status - R.Veness

  8. CMS: Cavern Activities • Forward pipe • Installed Mar ‘08 • Leak problems with TAS seal, eventually resolved • Central pipe • Installed Apr ’08 • Leak tested OK • HF/CT2- assembly • Installed 25/4/08 • Gas injection system • Installed in cavern, connections in progress • Commissioning expected ~20th May • Remaining tasks • End cap pipe ‘-’ due for installation tomorrow • 45 days of VAC activities before chamber commissioned on 16th June - ! • Installation and bakeout teams in parallel • Pure gas filling, PIXEL installation, final closing and pumping come after this Central Pipe installation Beampipe Status - R.Veness HF/CT2 chambers installed on ‘-’ side

  9. LHCb • Recent activites • Re-configuring beampipe protection for detector tests • VELO testing • VELO handover meetings – still some details to agree • Reserve chambers • UX85/1 chamber: • large leak discovered during final testing before sending for NEG coating • CERN workshops will re-manufacture another spare for end May 08 • UX85/2 and /3 chambers mechanically complete and tested • Remaining activities • Final pure gas pump-out to be scheduled • Dates need to be coordinated with other experiments Beampipe Status - R.Veness

  10. Access to, or Removal of Beampipes • Possible scenarios requiring access or removal • Re-activation of NEG following extended use [normal] • Re-activation of NEG following accidental saturation [urgent] • Leak in beampipe due to damage during intervention [critical] • Current Situation • All experimental vacuum chambers are ‘single point failure’ items for the LHC machine • One spare exists (or will before first beam) for most chambers • Exceptions are: CMS endcap pipe, ALICE RB26 chambers • Spares for beryllium chambers are in stainless steel for ATLAS, ALICE, CMS and aluminium for LHCb • A 1m beryllium section with stainless steel ends exists at CERN as a common replacement for ATLAS, ALICE and CMS • NEG activation equipment • ATLAS and ALICE-RB26 equipment is permanently installed • ALICE-central pipe, CMS and LHCb equipment is (basically) removable Beampipe Status - R.Veness

  11. Access to, or Removal of Beampipes (2) • Proposed Actions • Produce a spare CMS endcap pipe [but not ALICE RB26 chambers?] • Evaluate (VAC+Experiments) the time for these ‘long’ interventions • Inform and get approval from LHC managment • Depending on results, either: • Look for ‘emergency’ methods of reducing these access times • Consider additional procedures or access restrictions to minimise chance of access being required Beampipe Status - R.Veness

  12. Currently Requested Consolidation Activities • ATLAS • Replace stainless steel VA chambers with aluminium (2 years) • Replacement VI beryllium chamber for PIXEL upgrade (5 years) • ATLAS and CMS (inner triplet upgrade) • Replace TAS chambers with larger diameter (3 years) • Re-design and replace remote flanges with larger diameter versions (3 years) • Re-design and replace 19m pumping stations with larger diameter versions (2 years) • LHCb • Replace defective UX85/3 beryllium chamber – approval in progress (Target: 2009/10 shutdown) • Re-optimise UX85/2 and UX85/3 fixed supports for lower-Z versions (Target: 2009/10 shutdown) • Replace stainless steel with aluminium bellows (2 years) • Replace VELO boxes (VAC support for NIKHEF) (TBD) Dates are estimates for design and manufacture from time of project approval Beampipe Status - R.Veness

  13. Experimental Vacuum: Re-structuring for Operation • Completion of installation • The AT-VAC/EN section (R.Veness) remains the contact for completing the installation of the experimental sectors • Vacuum operation • The AT/VAC-LHC section (V.Baglin) will take over operation of the experimental sectors from commissioning- operational questions should be addressed to him • Interventions, consolidation and upgrade • R.Veness will be the contact for planning annual shutdown activities • AT/VAC-LHC will take over vacuum-related interventions • AT/VAC-EN will undertake mechanical interventions • AT/VAC-EN will be responsible for new beampipe and support design Beampipe Status - R.Veness

  14. Summary • Installation of experiments • ALICE and LHCb largely complete - the few remaining activities must be carefully scheduled as resources are stretched • ATLAS final closure started, but still 38 days work remain • CMS going well – 3 chambers in last 2 weeks, still 4 more to install, 45 more days of activity • Operation and consolidation • Access scenarios and times need to be clarified and agreed by management • Please make sure we are included early in planning the 2008/9 shutdown • We will need to coordinate between all experiments and find extra resources if justified by volume of work • Work is starting on consolidation tasks, we need to: • Verify the list of tasks • Agree the scope, schedule and financing Beampipe Status - R.Veness

  15. Additional Material Beampipe Status - R.Veness

  16. Contract timescale for Phase 1 beryllium pipes Chamber assembled ready for installation Engineering design agreed Installation in ATLAS starts Contract placed Call for tenders 2001 2002 2003 2004 2005 2006 2007 Market survey placed Finance committee approval for contract placement ATLAS chamber delivered to CERN Integration into PIXEL starts in SR1 Total contracting and manufacture: 4 years, 2 months Total project duration: 6 years, 5 months Beampipe Status - R.Veness

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