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Barrel Maintenance S cenario for LS1

Barrel Maintenance S cenario for LS1. MUON-IB CMS week 11 December 2012 A. Benvenuti (INFN Bologna). LS1 Barrel Schedule 26-nov-12. In spite of long shutdown, access to inner wheels, YB0 YB±1 is rather short

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Barrel Maintenance S cenario for LS1

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  1. Barrel Maintenance Scenario for LS1 MUON-IB CMS week 11 December 2012 A. Benvenuti (INFN Bologna)

  2. LS1 Barrel Schedule 26-nov-12 • In spite of long shutdown, access to inner wheels, YB0 YB±1 is rather short • Main challenge is the large number of activities with conflicting requirements especially in YB0

  3. Outline of LS1 Activities • DT Upgrade: • TRB replacement in Theta SuperLayers • Plan has evolved on the basis of: • Difficulty of intervention in YB0 • Accessibility considerations for repairs • Better estimate of the TRBs mortality rate • New TRBs will be installed only in MB1 (and MB2) of YB±2 • “Easy” operation in the absence of the Beam Pipe

  4. DT Upgrade: Sector Collector Relocation • 12 OF trunk cables UX-USC are required for each wheel • Central cabling team of 4-5 people required for 3 days each wheel • Increased granularity of SC power distribution in UX racks requires re-arranging LVDS cables from MC • 2 persons from central cabling teams needed for 2 days each rack • Final crate cabling done by DT personnel • Rearrangement of USC racks S1D08-S1D07 and S1D15 to S1D13 for Trigger and Readout Crates • SC Relocation can be done only after completion of ordinary maintenance and TRB replacement in a given Wheel

  5. Outline of LS1 Activities • Ordinary Maintenance: • RPC: • Electronics replacement: FEB, LV DB (13 Chambers • Gas leak search • HV connectors replacement • DT: • HV problems (14 chambers) • MiniCrates repairs (~39 ) • Alignment: MAB maintenance, upgrade • Preventive maintenance: leak detection cables, outer MB4s shielding, gas leaks, check flexible pipes, quick connectors on thermal shields, additional Hall probes, … • Interleaved with: • HO refurbishment in YB0, YB±1 and YB±2 • Strips, Pixel, HB cables on YB0 and access inside Solenoid Typically, 6 days/wheel

  6. 4 4 4 4 4 3 3 3 3 3 5 5 5 5 5 2 2 2 2 2 6 6 6 6 6 1 1 1 1 1 7 7 7 7 7 12 12 12 12 12 8 8 8 8 8 11 11 11 11 11 9 9 9 9 9 10 10 10 10 10 Problems in DT or RPC +1 +2 0 MC Repair -1 -2 DT HV Phi DT HV Theta RPC Extract • No access to YB0, YB±1 since February 2009 • YB±2 MC maintenance in YETS 2009 • DT HV problems: 2 chambers lowered to the floor, 4 extracted, 8 in place Fixed from IP side “easy” Uncabling, extraction on YB Usually only moving cables 6

  7. 4 3 5 2 6 1 7 12 8 11 9 10 0 - MC Repair 18 days (24 if EB cables are already removed) • Many activities in a very short time, S04 is the most complex sector • Time estimates based on DT/RPC HO parallel work assume priorityaccess to 2 SL (+1 small) and 1 CP • Crane usage required for mounting/removing the chamber extractor (2hours/ 1 h) and for removing/installing 2 chambers in S04 (2hours/2h) • The schedule is very tight for standard maintenance: gas leaks, HV connectors, ….. • Some contingency can be achieved during Tracker YB0± access from: • Removing EB LV cables • HO SiPm replacement trial run on YB0+ S06,S07 DT HV Phi DT HV Theta RPC Extract

  8. Cradle positioned as for MB1S04 but Large MB4 shown • YB0 MB1S04 is easy to remove/install: • Cradle is mounted above MB1 and is removed after MB1 is posed on support table • Cradle insertion with ~1m extension rails requires 3m clearance in front of table times cradle size 4m • Cradle insertion footprint 6m x 4m • HV intervention+ test footprint 3m x 3m required for 2-3 days Crane needed to configure the cradle for MB4 and to rotate it upside down

  9. MB4S04 MB4 S04 Removal (YB0-) • Main difficulty in attaching cradle to YB0 • Requires working under suspended weight (cradle) but secured to the iron. • 3m x 4m floor footprint • HV repair with chamber on cradle • 2-3 days required including testing + contingency

  10. MB1S04 Two separate problems: HV Board disconnected in SL1 L4 giving a loss of 16 channels (67 cm) Front End Board in SL3 giving a loss of 4 channels in all layers HVBs and FEBs are inside the gas volume • MB4S04 • There is a short since 23/08/2009 • in a strip channel of SL1 L4 , most probably in the HVB. • Enrico Borsato mitigated the problem at the level of the JunctionBox • It is important to understand what happened

  11. MB3 S08 Maintenance in December 2008 • Crane required for handling support pieces, 2 hours for mounting 1hour for dismounting • Special extractor for RPC interventions can be mounted without the crane

  12. YB0- Workflow

  13. 4 4 3 3 5 5 2 2 6 6 1 1 7 7 12 12 8 8 11 11 9 9 10 10 HO RBX 09/09/13 – 03/10/13 • YB-1 must be aligned with VacTank to allow easy access to chambers • Access scaffolding must be removed during S04(most problematic) and S10 work, • 3m clearance between YB-1,YB-2 to pull MB2 S04 • Crane usage required for mounting/removing the chamber extractor (2hours/1 hour) • 2-3 SL required at all times to allow parallel work, YB-2 HO RBX are on IP side. • YB-2 DT HV repairs done from IP side • YB-1 MABs survey before closing YB-2, 5m clearance required -1 -2 09/10/13 – 21/11/13

  14. The CHALLENGE

  15. PIXEL CO2Cooling Pipes • 2 Bundles / side • 1 bundle = 4 vacuum insulated pipes. • One pipe split in 3 sections • Check 3D models with mock-up • 8 weeks manufacturing • Bottleneck for YB0- • Blocks work on YB-1

  16. Summary • Main concern is the large assortment of different activities on YB0, hopefully the number and scope has finally stabilized. • Last chance to fix DT/RPC problems on YB0 until LS2 or beyond (and it will not be any easier) • Parallel work requires adequate resources, manpower and tooling. We cannot duplicate the crane but there should be enough scissor lifts and cherry pickers to go around. • Interference between Barrel and EndCapMuon is primarily with crane access. But it is limited to few instances and mostly for short (~2 hours) periods. • In the present schedule, DAQ1 and TTC availability severely affects YB+2 commissioning and SC relocation due to the late start of the Barrel activities.

  17. Additional Material

  18. 4 3 5 2 6 1 7 12 8 11 9 10 • TRB replacement and MiniCrate maintenance are the main activities • VacTank access scaffolding prevents the efficient plan envisioned. It should be removed during the work on S03-S05 and S09-S11 • 2 SL required all time to allow parallel work for DT-RPC standard maintenance • Crane usage required for mounting/removing the chamber extractor (2hours/1 hour) • 2-3 SL required all time to allow parallel work, YB-2 HO RBX are on IP side. -2 18/10/13 – 14/11/13

  19. 4 4 3 3 5 5 2 2 6 6 1 1 7 7 12 12 8 8 11 11 9 9 10 10 +1 0 + 18/11/13 – 14/01/14 • Major concern is the impact of YETS13 and the availability of needed infrastructure: gas, cooling, power, DAQ..) • Few DT/RPC problems to be fixed but • S10 EB, TRACKER LV cable removal is laborious • Position of additional cable trays to be checked ASAP • DT HV problems in YB+1 must be fixed from IP side • VacTank access scaffolding should be replaced for YB+1 MB3S04 HV repair HO RBX 16/01/14 – 11/02/14

  20. 4 4 3 3 5 5 2 2 6 6 1 1 7 7 12 12 8 8 11 11 9 9 10 10 +2 +1 16/01/14 – 11/02/14 • YB+1 must be aligned with VacTank to allow easy access to chambers • Access scaffolding must be removed during S04, S10 work, it is a barrier for SL displacement N-F • 2-3 SL required at all time to allow parallel work, YB+2 HO RBX are on IP side. • YB+2 DT HV repairs, MB4S04, MB4S12, done from IP side • YB+1 MABs survey before closing YB+2, requires 5m clearance HO RBX 12/02/14 – 19/03/14

  21. 4 3 5 2 6 1 7 12 8 11 9 10 +2 • TRB replacement and MiniCrates maintenance are the main activities • VacTank access scaffolding prevents the efficient plan envisioned. It should be removed during the work on S03-S05 and S09-S11 • 2 SL required all time to allow parallel work for DT-RPC standard maintenance • Crane usage required for mounting/removing the chamber extractor (2hours/1 hour) 12/02/14 – 19/03/14

  22. YB0- HO-DT-RPC Work Flow • Remove MABs • Remove vacuum tank Thermal Shields • Remove “Removable services” • Disconnect/remove RPC/DT cables and services as needed • HO upgrade interleaved with DT/RPC maintenance: • 2 days of HO Priority access to a bi-sector • 2 days of parasitic access • DT maintenance on YB-1 (IP side) • Lifting platforms (2-3 SL and 1 CP) should be available at all times to allow working on both sides of YB0 or on YB-1 • Intermittent crane usage for chambers handling • Final tests (several days) after intrusive interventions are completed (DT-RPC preventive maintenance in parallel) • Mount vacuum tank Thermal Shields interleaved with “Removable Services” installation • Install MABs and test connectivity • Survey MABs (5m clearance in front of YB0) • YB-1 can be moved on vacuum tank

  23. 4 3 5 2 6 1 7 12 8 11 9 10 0 - • Additional cable trays can be installed with CMS closed. • Before interventions, remove: • MABs, 1-2 VacTank TS • ECAL LV cables, cable trays • RPC DT cables as needed • In YETS08-09 YB0 was open on Z± => efficient conditions • Many activities in LS1: HO, DT, RPC, Tracker • Coexistence => inefficiency • But we all have to work • Careful, realistic planning mandatory for success

  24. Opportunity for: • Tuning HO SiPm procedures on YB0+ S6, S7 • Removing DT/RPC cables where needed • Fix MC problems • As scaffolding design allows

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