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Long shutdowns LS1, LS2, LS3

Long shutdowns LS1, LS2, LS3. “Baseline” after Chamonix 2011. LS 1. Extended maintenance. 2024. LS 2. LS 3. Extended maintenance. LHC draft version. Oliver Bruning ACES Mar 2011. The next decade : the alternative version. NOT FOR RE-DISTRIBUTION. LS1. ………. LS2. (FPIX, PLT)

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Long shutdowns LS1, LS2, LS3

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  1. Long shutdowns LS1, LS2, LS3 “Baseline” after Chamonix 2011 LS 1 Extendedmaintenance 2024 LS 2 LS 3 Extendedmaintenance

  2. LHC draft version Oliver Bruning ACES Mar 2011

  3. The next decade : the alternative version NOT FOR RE-DISTRIBUTION LS1 ……… LS2 (FPIX, PLT) 45mm beampipe. Fwd mu (YE4,CSC4,RE4, ME1/1) HO SiPM, HF PMT THIP BSC2 LHC: Splices, Collimation IR3 R2E changes Linac4 ?, PSB? Cryo-collimation? “driven by expts” (ATLAS wants 2019) HB/HE SiPM and granularity LHC: collimation, SPS.LHC mods Prepare RF upgrade & crab cav. 2-week 4-month: Open endcaps, New pix HB/HE? 4-month: Open endcaps? (FPIX,PLT, THIP) 8-week HF chain? Awaiting resource loading on LHC side provisional LHC planning promised for June importance of performance parameters after LS1 (nominal probable) TC/EAM working on provisional planning for TS(11-12), LS1 and TS(15-16/16-17)

  4. Shutdowns & year-end Tech Stops Detailed objectives for each tech stop/shutdown period are interdependent and will evolve progressively depending on -the timing & duration of future stops/shutdowns -the achievements in past stops/shutdowns -the physics achievements (potential) for past (future) operation periods Activities must form part of a coherent plan covering extended technical stops & shutdowns (LS 1, LS 2, LS 3) in tune with the developing performance of LHC. The postponement of the 2011-13 shutdown (LS 1) to 2012-14, or maybe 2013-15 will: -delay the whole LS 1 task-list by 12-16 mo. -allow some tasks scheduled for LS 2 to be pre-empted. -pose a problem for upgardes scheduled for an earlier LS2 -tend to put pressure for more maintenance and repair tasks (& even upgrade tasks) during year-end stop 2011-12.

  5. Baseline: Long Shutdown 1 Timeframe Est Integ Tasks lumi /fb-1 Items carried over from year-end stop 2011-12 (if no opening) 2013-15 5-15 Yoke Endcap disk 4 construction at +z and –z ends in situ. 4’th muon endcap stations +z and –z (CSC & RPC) 1’st endcap muon station readout granularity restoration +z and -z Beampipe region RP shielding + forward region opening under vac. -CASTOR, ZDC, TOT (?) reinstallable for special runs (HI etc) HO, HF & CASTOR calorimeters phototransducer change Muon sector collector move and TRB replacement Beampipe --> remove 59.6mm central beampipe/ install 45mm Barrel – endcap seal revision for colder Tracker operation Piping and test structures for 4-layer pix cooling Beam Scintillation Counter upgrade/replacement. + very many other infra & common systems consolidations. After which CMS should be ready for 13-14 TeV, 100+fb-1 and 1-2 x 1034cm-2s-1

  6. B A E CMS: Shutdown 2012-14: + z seq Martin Gastal EN-MEF C H G The detailed planning already reached 300 discrete tasks and spans 5 May 2012 to 13 Mar 2012 (21 months) 6/7 configs

  7. Year-end Technical Stops The experience of 2009-10 and 2010-11 shows that all 4 experiments can successfully complete complex interventions requiring partial opening in a year-end Technical Stop of ~10 - 12 weeks, with work spanning the CERN closure if necessary. Activities have already included : consolidation & first installation/upgrade : emergency repair and routine maintenance. The year-end Tech stops are an important ingredient in the overall consolidation and upgrade plan as well as being essential for maintenance and repair. So far experiment work stayed ~ within the shadow of LHC work. --> may not always be possible/desirable --> options for major interventions like 4-layer pixel insertion in a 3-4 month extended year-end stop The 2011-12 is very likely to be an extended year-end stop of 12 weeks It starts in 6 months time!!!

  8. Year-end stop: 2011-12 Essential: Install the much-delayed ZDC crane (last chance - activation) Validate CASTOR calorimeter insertion with beampipe at vacuum. If we open the yoke (decision: Sept 2011), plan a “12 week” programme RP studies & shielding test Survey beampipe to confirm position Extract and repair forward pixel Install pixel luminosity telescope Investigate/improve pixel & strip Tracker humidity Limited muon system maintenance & upgrade test installations Consolidate yoke moving system Connect redundant compressor system in cryo hall (if funded 2011) Opening both ends doubles the risk but adds only 3-4 days compared to opening 1 end, provided we have full manpower. This workplan will cost 0.9-1.0 MCHF (Beampipe NEG pumping to be checked – bakeout operation adds 6 weeks if both endcap yokes already opened) After which CMS should be ready for 7-8 TeV, 15 fb-1 and 2-3 x 1033

  9. Year-end stop: 2011-12 Assume a “12 week” stop, starting 6th Dec 2011, ending 15 Mar 2012 Approx 80 2-shift working days available following our usual planning rules Base planning on field experience from 2009-10 & 2010-11 (for TOTEM T1) + end fully open 15 - end fully open 21 + end pixel access available (+/- interchange poss) 24 (difficult by XMAS) - end pixel access available 30 Access to pixel and TK endflange 20 working days + end closing start 50 + end yoke closed 56 - end yoke closed 61 +end forward closed 68 -end forward closed 71 Beampipe pumpdown start 71 Magnetic field cycle and and ramp to 3.8T 76 Ready for beam 80 (If the 2 weeks XMAS site shutdown is included in the 12 weeks, subtract 10 days!!)

  10. Beampipe: Mechanical design 3120 1900 RF HOM: shape OK Machine inner cones & support from Be or AlBe? Option to replace SS conical section (up to bellows & junctions with Endcap pipe) with AlBe. Lighter, as strong, reduces sag & activation. New pipe: SS+ Be: 22% more sag CMS E & I, for C. Schaefer

  11. Beampipe Issues: mechanical tolerances The reduced radius can be viewed as a consolidation based on as-installed experience: Confirmed by CMS surveyors Not incl target to quad transfer < 1.0mm with AlBe Confirming with B=2T, 3.8T beampipe radiaography Conservative : over 3 yaers The requested 21.7 mm inner radius looks feasible

  12. Beampipe: NI radiography in z slices Maxime Gouzevitch, Guacomo Squazzoni: for TIG, May 2011 0.35mm 2T (2011) differs from 3.8T (2010) by only a few mm.

  13. Beampipe issues Would it be a problem to build the inner cones ~1900mm <z< ~1450mm of AlBe?

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