Pix meeting May 2011 AB Long shutdowns LS

Pix meeting May 2011 AB Long shutdowns LS 1, LS 2, LS 3 “Baseline” after Chamonix 2011 Extended maintenance LS 1 2024 LS 3 Extended maintenance LS 2

Pix meeting May 2011 AB LHC draft version Oliver Bruning ACES Mar 2011

Pix meeting May 2011 AB The next decade : the alternative version NOT FOR RE-DISTRIBUTION 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 111 111 111 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 12 3 4 5 6 7 8 9 0 1 2 2 -week 4 -month: Open endcaps? (FPIX, PLT, THIP) LS 1 (FPIX, PLT) 45 mm beampipe. Fwd mu (YE 4, CSC 4, RE 4, ME 1/1) HO Si. PM, HF PMT THIP BSC 2 LHC: Splices, Collimation IR 3 R 2 E changes Linac 4 ? , PSB? Cryo-collimation? 4 -month: Open endcaps, New pix 8 -week HB/HE? HF chain? LS 2 ……… “driven by expts” (ATLAS wants 2019) HB/HE Si. PM and granularity LHC: collimation, SPS. LHC mods Prepare RF upgrade & crab cav. Awaiting resource loading on LHC side provisional LHC planning promised for June importance of performance parameters after LS 1 (nominal probable) TC/EAM working on provisional planning for TS(11 -12), LS 1 and TS(15 -16/16 -17)

Pix meeting May 2011 AB 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 LS 2 -tend to put pressure for more maintenance and repair tasks (& even upgrade tasks) during year-end stop 2011 -12.

Pix meeting May 2011 AB Baseline: Long Shutdown 1 Timeframe Est Integ lumi /fb-1 Tasks 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. 6 mm central beampipe/ install 45 mm 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 Te. V, 100+fb-1 and 1 -2 x 1034 cm-2 s-1

Pix meeting May 2011 AB CMS: Shutdown 2012 -14: + z seq Martin Gastal EN-MEF A G E The detailed planning already reached 300 discrete tasks and spans 5 May 2012 to 13 Mar 2012 (21 months) H C B 6/7 configs

Pix meeting May 2011 AB 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!!!

Pix meeting May 2011 AB 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 Te. V, 15 fb-1 and 2 -3 x 1033

Pix meeting May 2011 AB Year-end stop: 2011 -12 Assume a “ 12 week” stop, starting 6 th 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 T 1) + 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 ramp to 3. 8 T 76 Ready for beam 80 (If the 2 weeks XMAS site shutdown is included in the 12 weeks, subtract 10 days!!)

Pix meeting May 2011 AB Beampipe: Mechanical design 3120 1900 RF HOM: shape OK Machine inner cones & support from Be or Al. Be? Option to replace SS conical section (up to bellows & junctions with Endcap pipe) with Al. Be. Lighter, as strong, reduces sag & activation. New pipe: SS+ Be: 22% more sag CMS E & I, for C. Schaefer

Pix meeting May 2011 AB Beampipe Issues: mechanical tolerances The reduced radius can be viewed as a consolidation based on as-installed experience: Quantity Original estimate Measurement Construction tolerance 2. 6 mm <0. 3 mm Installation tolerance 2. 6 mm 1. 5 mm Confirmed by CMS surveyors Not incl target to quad transfer Sagging between supports 2. 2 mm <2. 6 mm < 1. 0 mm with Al. Be YB 0 yoke distortion 1. 4 mm <0. 5 mm Field induced movements 1. 2 mm <0. 1 mm Confirming with B=2 T, 3. 8 T beampipe radiaography Cavern movements 5 mm <1. 5 mm Linear sum 15 mm <6. 5 mm Assumed beam “stay-clear” radius 14 mm Min beam pipe inner radius 29 mm ~20. 5 mm The requested 21. 7 mm inner radius looks feasible Conservative : over 3 yaers

Pix meeting May 2011 AB Beampipe: NI radiography in z slices Maxime Gouzevitch, Guacomo Squazzoni: for TIG, May 2011 0. 35 mm 2 T (2011) differs from 3. 8 T (2010) by only a few mm.

Pix meeting May 2011 AB Beampipe issues Would it be a problem to build the inner cones ~1900 mm <z< ~1450 mm of Al. Be?