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Brief Status of LHC Experimental Vacuum Project

Brief Status of LHC Experimental Vacuum Project. Ray Veness CERN TE/VSC. Contents. Overview of the upgrade project Project work packages Recent changes to the project ‘environment’ Key activities in the 2012 shutdown Key activities in the 2016 shutdown Diameters of central beampipes

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Brief Status of LHC Experimental Vacuum Project

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  1. Brief Status of LHC Experimental Vacuum Project Ray Veness CERN TE/VSC

  2. Contents • Overview of the upgrade project • Project work packages • Recent changes to the project ‘environment’ • Key activities in the 2012 shutdown • Key activities in the 2016 shutdown • Diameters of central beampipes • New requests from the experiments • New data on beampipe alignment • Current issues under discussion • Conclusions LHCC Nov'10- R.Veness

  3. Project Work Packages • Timescale • Agreed May 2010 • Covers period 2010-2015 • Some modifications will not be complete by the end of this period • Volume of work • 3 new beryllium chambers • 11 other new vacuum chambers • 8 other vacuum technology developments • Access procedures in activated environments • Development, design, construction, installation, commissioning • Integrated project resources • 27.4 person-years staff (~4.5 people average full-time) • 6.5 person-years of visitors • 5982 kCHF of installed hardware and 2590 kCHF of VSC project costs LHCC Nov'10- R.Veness

  4. Recent Changes to Project Environment • Project now operating • We have recruited 1 staff engineer, 1 staff technician, 1 fellow and 1 technical student for the project between July and October 2010 • Vacuum technology development and procurement of components is in progress • ‘White Paper’changes to LHC schedule • CERN White Paper ‘Provisional Planning for the LHC and Injectors for the Next Decade’ in August 2010 • 2014 shutdown becomes 2016 and 2018 shutdown becomes 2020-21 • ATLAS and CMS new PIXEL layer installation delayed to 2016 • ALICE replacement central beryllium pipe comes forward to 2016 [not yet in work packages] • LHCb new vertex detector in 2016 [not yet in work packages] LHCC Nov'10- R.Veness

  5. 2012 Shutdown: ATLAS Half-length of the ATLAS beam vacuum sector • 4 new vacuum chambers • No change in envelope (beam aperture) • Replace stainless with aluminium for reasons of: • Access and ALARA during interventions • Detector background • Requires detector opening and removal of 6 vacuum chambers LHCC Nov'10- R.Veness

  6. 2012 Shutdown: LHCb Cross-section of LHCb experiment • Install 1 new chamber and 2 new support systems • Install a replacement UX85/3 conical beryllium chamber • Required due to varnished leaks in the existing chamber • No change to layout or material • Install and position new ‘spider’ supports for the UX85/2 and UX85/3 chambers • Re-optimised for lower-Z with material changed from aluminium to beryllium • Requires removal of 3 vacuum chambers and their supports View inside magnet showing chambers and spider supports LHCC Nov'10- R.Veness

  7. 2016 Shutdown: ATLAS and CMS • ATLAS and CMS consolidate PIXEL detectors • Add another layer of pixel • IBL project in ATLAS and 4-layer PIXEL in CMS • Make room for the detector by reducing the central beampipe diameter from 58 to (50mm) • Beam aperture for current and Phase-I upgrade optics (as per 2009) were studied • Implications for CERN TE-VSC • Design and production of 2 new beryllium chambers and supports • Full opening of both experiments and removal of all vacuum chambers (16 in total) • Complex retro-fit procedure inside existing ATLAS detector • Full procedures for interventions in a radioactive detector Installation of CMS beryllium LHCC Nov'10- R.Veness ATLAS beryllium pipe in the PIXEL

  8. Renewed Discussions on Central Beampipe Diameters • Situation upto summer 2010 • Working towards a reduction from 58mm to 50mm diameter for ATLAS and CMS in 2014 • Aperture and machine protection were check OK by machine experts • We were awaiting finallayouts in ‘Z’ to verify vacuum, impedance and collimation • Request to study sub-40mm chamber for ALICE in 2018 • ALICE had stated that a 50mm chamber would not give enough space for a useful PIXEL upgrade • Situation as of Autumn 2010 • Request for sub-40mm diameter chamber for ALICE for 2016 • Working towards a decision on an acceptable diameter for the end of 2011 • Request for sub-50mm diameter chamber for CMS for 2016 • Request for sub-50mm diameter chamber for ATLAS for 2012 shutdown • ATLAS would like an ‘urgent’ spare chamber compatible with the IBL LHCC Nov'10- R.Veness

  9. New Information on Beampipe Alignment Data collected during the 2010 run has given new insight into the actual position of the beampipe on the interaction plane with respect to beam and detectors M.Nessi (ATLAS) in LEB meeting of 4/11/10 W.Riegler (ALICE) in LEB meeting of 4/11/10 LHCC Nov'10- R.Veness

  10. Open Issues • ‘Tomography’ data from ALICE, ATLAS and CMS show good correlation with the originally installed positions of the chambers, however there are still open questions: • High-β optics may not be compatible with 50mm or less diameter • ATLAS and CMS confirm they do not see the need for high-β after 2016 • Is this an issue for an ATLAS ‘spare’ for the 2012 shutdown? • Does the beampipe move relative to the beam over a longer period? • Data still being collected by ATLAS et al. • Has there been any movement of central beampipes away from the interaction plane? • eg. tomography would not show ‘rotation’ of the chambers • Other issues: Vacuum (stability, pressures), impedance and heating, collimation check require the length of the smaller diameter section • Formal approval via Engineering Change Request and presentation to LHC Machine Committee will be required LHCC Nov'10- R.Veness

  11. Conclusions • Consolidation and upgrade project • Project is approved, personnel have been recruited and is now in progress • Work is progressing as planned for the 2012 shutdown changes • Recent changes to the LHC schedule and new requests from the experiments mean that the work packages and associated resources must be revised • Diameters of upgrade chambers for ALICE, ATLAS and CMS • Reduction of beampipe diameter to 50 mm has been verified for post-2016 operation for aperture, machine protection, mechanics and survey • Missing longitudinal layouts for verification of vacuum, impedance and collimation • Data from the experiments collected during the 2010 physics run are starting to give useful feedback as to the relative positions of beam, beampipe and detectors • This may yield some additional margin for reducing beampipe diameters • Spare beryllium chamber for ATLAS • The request for a sub-50mm spare beryllium chamber to be ready in time for a 2012 LHC shutdown is extremely challenging, from both technical and logistical points of view LHCC Nov'10- R.Veness

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