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CMS Tracker infrastructure work in LS1

CMS Tracker infrastructure work in LS1. Scope Planning 2012-2014 Infrastructure tasks Implications for funding agencies. Scope of LS1 infrastructure work. Photo: M. Hoch. Main objective: After LS1 the Tracker must run cold. Need -10 0 C on sensors

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CMS Tracker infrastructure work in LS1

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  1. CMS Tracker infrastructure work in LS1 Scope Planning 2012-2014 Infrastructure tasks Implications for funding agencies Ettore Focardi

  2. Scope of LS1 infrastructurework Photo: M. Hoch • Main objective: After LS1 the Tracker must run cold. • Need -100 C on sensors • Need -200 C (or -25C, if possible) coolant in Tracker • At present, lowest SST coolant temperature is +4C • Current obstacles on lowering the temperature: • Humidity levels too high: Dew point ~ 0C in the TK service channels inside YB0 • Cooling capacity of the SS and ‘brine’ cooling plants not sufficient (min. -40C) • In addition, improvements needed on performance and reliability of many related sub-systems: dry gas, dew point measurements, Pipes insulation, heaters, thermal screens, etc. • LS1 is the UNIQUE OCCASION to solve these, we need to prepare for it now! Ettore Focardi

  3. Planning 2012-2014 LS1 start LS1 end Now 2012 2013 2014 Currently planned YB0 accesses: Limited CMS closedMagnet test ‘Full’ Limited • For many of the tasks we need full access to inside YB0, both ends. • We want to work inside YB0 early, to leave time for testing and possibly needed improvements. • Full proof check when CMS closed and magnet on. • If failing, need a big planning change to re-gain access inside YB0. • Are the currently allocated access times enough? • We don’t know yet, need to work out a more detailed planning, looking to the interconnections between other subdetectors work and services availability • LS1 is already this year ! Ettore Focardi

  4. CMS LS1 planning, March 2012 draft Full access to YB0, currently 40 working days in March-April 2013 Ettore Focardi

  5. Plan details Ettore Focardi

  6. Infrastructure tasks to be accomplished • Tasks grouped in following categories: • Vapour barriers and seals • Dry gas • Dew point sensors • Other YB0 activities • C6F14 cooling system • CO2 cooling system • Power system • Rack cooling • General services • Other tasks • Tasks listed in an Excel file, available on “CMS Tracker Engineering and Infrastructure” Sharepoint site: https://espace.cern.ch/cms-tracker-engineering/Shared%20Documents/Forms/AllItems.aspx Ettore Focardi

  7. Vapour barriers and seals CMS inflatable seal Potting of services Local sealing Continuous vapour barrier up to PP1s or edge of vac-tank Bulkhead cover plates and seals up to beam-pipe Inner seal between CMS end-cap and TK bulkhead Ettore Focardi

  8. Humidity barriers Bulkhead Pixel volume seals TK service channels Photo: M. Hoch Ettore Focardi

  9. TK bulkhead open Ettore Focardi

  10. TK bulkhead edge Many TK cooling pipes without insulation This is ECAL. No vapour barrier on the backside between ECAL and TK services ! Ettore Focardi

  11. THIP venue Multiple paths for humidity to reach the TK bulkhead, via HCAL and ECAL volumes Ettore Focardi

  12. Local vapour barrier @ bulkhead Region to be “boxed” Tracker bulk-head Pipe insulation ends ~here B C Last Section of a PP1-Channel A Extra dry gas flow Ettore Focardi

  13. CMS global seals Add here a seal between CMS barrel and endcap? Ettore Focardi

  14. Tasks: Vapour barriers and seals (1/2) Ettore Focardi

  15. Tasks: Vapour barriers and seals (2/2) Ettore Focardi

  16. Summary of existing systems for air and N2 • 3 Compressed air production sites/circuits • - SU5: “Soufflettes” – in good conditions, being used also for Tk brine cabinet flushing in CV room (a better solution should be investigated) • SL5: “Haute Pression” – used for moving wheels, CMS responsibility • SH5: “Instrument air” + Tk cooling units, etc.– most critical circuit, 180 Nm3/h available • 2 liquid N2 dewar systems • 1 “Big” for magnet cryo + detector flushing, max gas flow 60 Nm3/h • 1 “Small” for DT and piloting of gas circuit valves N2 & Compressed air network @ P5Update on March 19th, 2012 (Paola) Ettore Focardi

  17. Present layout of Nitrogen (gas) and dry air at P5 USERS OF N2 and DRY AIR @ P5 UGX55 quick connectors EN/CV valves in CV zone Tk I/P cabinets(top of by-pass) Ecal I/P cabinets(top of by-pass) Drier A (gas room) Drier B (gas room) Switch-over panel N2/dry air for detector flushing (gas room) Tk & ES cooling cabinets Detector flushing Beam pipe vacuum system shut-off valves (+many “piquages” in UXC) Cryo valves (magnet area) 3 4 10 9 Detector flushing 7 6 5 2 8 8 1 62 Nm3/h GN2 for detector flushing GN2 back-up line SH5 compressors dry air supply 105 Nm3/h average 180 Nm3/h peak Cryo cold box LN2 line 11 N2 dewar 62 Nm3/h gas when no LN2 is used Ettore Focardi

  18. Present issues and outlook The instrument dry air is used both for detector flushing (when no N2is available/can be used), cooling box flushing, valve piloting The total dry air flow available is NOT enough for all applications (see tables) In addition, no precise instrumentation and recording of consumptions! N2 cannot be used both for detector flushing and magnet cool down neither for nominal consumptions nor future guess consumption In the tables: the total amount of dry air and N2 consumptions as of today and the nominal/foreseen consumption for the future:N.B. Yellow values are guess numbers! HUGE MARGIN SHALL BE FORESEEN AT LEAST TILL THE END OF LS1 Ettore Focardi

  19. Detector flushing during LS1: needs and proposal • During LS1, sealing works will be executed at the level of the Tk bulkhead and will need to be validated • Validation of such works implies operation of the TK cooling systems at low T while CMS is still in open configuration • In this scenario, only dry air can be used for flushing, and not N2 • Only a tentative guess can be made on the needed air flow for this exercise (at least 50 Nm3/h for Tk bulkhead, at least 60 Nm3/h for cooling plants….but it could be much more) Present dry air system gives max 180 Nm3/h. Estimated needs for LS1 • About 70 Nm3/h for valve operation • At least 60 Nm3/h for cooling plant flushing • At least 130 Nm3/h for detector flushing Market Survey from A. Gaddi: plant exists that can provide both dry air or N2 do exist on the market, typical size could be 400 Nm3/h N2 or 700 Nm3/h dry air More details in the following Ettore Focardi

  20. Proposal for new layout of Nitrogen (gas) and dry air at P5 USERS OF N2 and DRY AIR @ P5 UGX55 quick connectors EN/CV valves in CV zone Tk I/P cabinets(top of by-pass) Ecal I/P cabinets(top of by-pass) Drier A (gas room) Drier B (gas room) Switch-over panel N2/dry air for detector flushing (gas room) Tk & ES cooling cabinets Detector flushing Beam pipe vacuum system shut-off valves (+many “piquages” in UXC) Cryo valves (magnet area) 3 4 10 9 Detector flushing 7 6 5 2 8 8 1 SH5 NEW dry air/N2 supply 700/400 Nm3/h 62 Nm3/h GN2 back-up for detector flushing GN2 back-up line Cryo cold box LN2 line SH5 compressors dry air supply 105 Nm3/h average 180 Nm3/h peak 11 N2 dewar 62 Nm3/h gas when no LN2 is used RED DASHED: NEW CONNECTION x CABINET FLUSHING Ettore Focardi

  21. Tentative planning LS1 start LS1 end Now 2012 2013 2014 Buy new plant Install new dryer/N2 plant N2 plant operational Rented N2 dewar operational Summer 2012: Order launched for new plant in SH5 Nov-Dec 2012: installation and commissioning of new N2/dry air plant Ap 2013: Tk sealing and cooling work completed May-Jun 2013: Humidity tests of new sealing, using dry air, assessment of total quantity needed Jan 2014: New beam pipe & Pix inside CMS Feb 2014: CMS closed, Tk cold and ON as soon as possible for tests of humidity and operation in cold - at this stage N2 source is needed!!! Rental of dewarseems a good option Later in 2014: commissioning of N2 plant, switch from rental dewar to plant Ettore Focardi

  22. Dew point sensors, not an easy installation job! Ettore Focardi

  23. Dew point sensors Ettore Focardi

  24. Other tasks in YB0 Ettore Focardi

  25. As mentioned before, LS1 goal is • Operate the whole tracker system (SS, Pixel and TS) at « nominal » coolant temperature. • From radiation damage point of view, it seems that it would be beneficial to reach beyond -200 C (perhaps -250 C) and every further degree we can go to it would improve detector lifetime, but is possible? • Assuming we have no limits coming from the « brine » and cooling plants, what is the lowest coolant temperature we can safely achieve without condensating between cooling plants and PP1s(*) ? • In 2007, during the pipe installation campaign, some pipes of a sector were tested with -200 C coolant and measured T to be roughly at +13 0 C on the outside of the insulation layers, which is the guaranteed max. dew point value in the cavern. Tracker Cooling Pipes Check-out (*) Here it is assumed that the heating cables/foils system between PP1 and the detector will give us quite a bit of margin and will not be the limiting factor. Is this true ? Ettore Focardi

  26. After some discussion (last week) it seems agreed to monitor T in all routes from PP1 to ~PP2 • It will be probably useful to test during LS1 at least the sector -6 route ( biggest bundle of pipes, ~80) by using the Pixel pipes, bypassed at PP0 • Test bench with pipes, insulations, vapour barriers can be prepared and results compared with calculations. Tracker Cooling Pipes Check-out Ettore Focardi

  27. -Z end Muon Sector (black) PP1 (red) -2,-3 -4,-5,-6,-7,-8,-9 SS2 -11,-12 SS1 Pixel TS1,TS2 -16,-17,-18 -13,-14,-15 Ettore Focardi

  28. Cooling systems • C6F14 cooling system performance increase • Absolutely needed • Full performance necessary in 2014 when TK commissioned for cold operation. • Partial availability needed also in 2013 to check humidity sealing quality. • CO2 cooling system (Pixel Ph1 upgrade) • Must progress also, and profit from unique access during LS1. • Prepare as much as possible the field for a much shorter access during a later YETS; plant location and pipes/services installation Ettore Focardi

  29. Othertasks • TK powersystemsmaintenance and replacements • Possiblereplacement of mainframes and Branchcontrollers (2014) • Rackcoolingimprovements • DAQ PC replacements • During 2013 • TestModuleThermalbehavior (186) • 2012 • Others … ? Ettore Focardi

  30. Summary LS1 start LS1 end Now 2012 2013 2014 Engineering, design Procurements • A very long list of tasks to be accomplished • Lots of careful engineering work to be done within the next few months, followed by procurements: • Increased dry air supplies (compressors, driers, pipework components) • Materials for humidity barriers and sealing • Dew point sensors, including their calibration • C6F14 cooling system improvements (SS and brine plant heat-exchangers, pumps, valves, plant door replacements, etc.) • ... Ettore Focardi

  31. Implications for funding agencies • Substantial investments to equipment (dry gas supplies, cooling system, sensors), but seems under control as reserves and provisions have been made (TFB) • The bottle-neck is our very limited availability of suitable manpower to cover the complete list of tasks.Leads right now to tasks being left not covered, or with slow progress. • Engineering / Design • Procurements • Developments, testing • The current big risk is that we will be late with the needed preparations before LS1 starts --- in 8 months ! This includes the summer vacation period... • We pursue the planning work to more detail level, and are looking for persons to take responsibilities of specific tasks. Ettore Focardi

  32. Impact on INFN Tracker plan to face the manpower needs for the foreseen actions in LS1: • create ~6 teams of 3-4 people to act possibly in parallel • Cern plans to use 7-10 people • USA plans to use 3-5 people • INFN target 3-5 people • Others: 3-5 people • Possibility of technical positions (6-12 months) for young engineers/physicists Starting from 2012. Let me know eventual availability of people…. Ettore Focardi

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