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The CMS TAS region: an overview

francis-sargent
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The CMS TAS region: an overview

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  1. Follow up meetingProtecting the experimental caverns and personnel from a "sector 34 like" incident: work planned in the LHC tunnel Prepared by M GASTAL with contributions from EN-MEF: David HAY (EAM team) CMS: Christoph SCHAEFER (CMS Glimos), Nicolas Siegrist (Ansys simulations), Teresa RODRIGO Mar SOBRON Joao ANTUNES (Alignment), Nebojsa SMILJKOVIC & Jean BOS (CMS design office) TE-VSC: Nicolas ZELKO, Patrick LEPEULE EN-MME: Jean-Pierre BRACHET Pascal MESENGE Gilles FAVRE (Central workshop), and Giuseppe FOFFANO EN-CV: Antonio Romanazzi (computations in fluid dynamics) Agenda:1- Modifications in the CMS TAS regions2- Sealing all remaining openings3- Pressure resistant doors and ODH sensors martin.gastal@cern.ch

  2. The CMS TAS region: an overview martin.gastal@cern.ch

  3. The CMS TAS region: an overview Cubical steel frame Rotating Shielding Fixed Iron Nose CMS TAS is inside the Fixed Iron Nose FIN is fixed to Cubical Steel Frame Rotating Shielding closes around FIN martin.gastal@cern.ch

  4. The CMS TAS region: an overview TAS Rotating Shielding Fixed Iron Nose Cubical steel frame CMS TAS is inside the Fixed Iron Nose FIN is fixed to Cubical Steel Frame Rotating Shielding closes around FIN martin.gastal@cern.ch

  5. The CMS TAS region: an overview Rotating Shielding Fixed Iron Nose martin.gastal@cern.ch

  6. The CMS TAS region: an overview TAS and its survey & alignment systems Modifications cannot prevent the TAS to be aligned in X and Y Inner triplet side martin.gastal@cern.ch

  7. The CMS TAS region: an overview IP side martin.gastal@cern.ch

  8. Modifications in the TAS region • Goals to achieve: • Restrict the TAS movements in Z during alignment • Prevent longitudinal TAS movement in case of an September 19th type of incident • Prevent a flow of He from the tunnel to propagate into the UXC55 • Avoid having to stay in the vicinity of the TAS once it is activated • E.g. alignment and removal operations • Limitations: • Stay clear of vacuum equipment • Keep a fixed point on tunnel side for TAS bake-out purposes • Keep the air flow around TAS for cooling purposes • Allow for a removal of the TAS during the phase 1 upgrade with minimal radioprotection risks martin.gastal@cern.ch

  9. How to restrict the TAS movements longitudinally? • In the event of a September 19th type of incident • During alignment & bake out martin.gastal@cern.ch

  10. Restrict TAS movements in Z • Use of a spring to allow disengaging the TAS quickly, without using spanners, from a distance if using a stick • Reuse of existing holes in TAS & Access to vacuum equipment remains the same martin.gastal@cern.ch

  11. Restrict TAS movements in Z • Assuming an over pressure of 110mb in the tunnel, each Z-stop will experience a maximum deflexion of 0.11mm • Stability of the TAS is insured by using 2 Z-stops on opposite sides of beam pipe • Installation scheduled to start on 02/09 • Manufactured in B530 workshop martin.gastal@cern.ch

  12. How will the TAS behave in the CMS magnetic field? • Both TASs have been instrumented and monitored while ramping up the B field from 0T to 3.8T • No significant movement was recorded 56 TAS: Delta(X): 60 microns Delta(Y): < 10 microns Delta(Z): 100 microns (towards IP) 54 TAS: Delta(X): < 10 microns Delta(Y): < 10 microns Delta(Z): 90 microns (away from IP) • Safe to assume that the TAS is unaffected by the CMS B field martin.gastal@cern.ch

  13. How to prevent an overpressure in the tunnel to propagate into the UXC55 through the TAS area? • Installation of an annular clapper • Allows the flow of air from the UXC55 to the tunnel, but prevent an overpressure to propagate from the tunnel to the experimental area martin.gastal@cern.ch

  14. Membrane design Material: 0.5mm thick Stainless steel Manufactured in central workshop Leaves a 2cm gap for air flow Trigger pressure for closure is 8mbar When exposed to 110mbar Max deformation = 9.10-6 mm Guided by existing structures martin.gastal@cern.ch

  15. Membrane: Configuration during Bake Out • When DC power is applied to the TAS built in resistors, the membrane must not be in contact with the connectors • An electrically insulated shim will be inserted to hold the membrane away from the conductors while blocking the air flow martin.gastal@cern.ch

  16. How to cool down the TAS? • Initial study by Egon Hoyer in Engineering Note M7801 martin.gastal@cern.ch

  17. How to cool down the TAS? • FLUKA simulations by S Muller give consistent values martin.gastal@cern.ch

  18. How to cool down the TAS? • The TAS equilibrium temperature in the absence of air flow was calculated to be ~ 100deg C. The temperature limit for the TAS vacuum chamber being set to 75 deg C, it would be reached within 2.5 month. martin.gastal@cern.ch

  19. How to cool down the TAS? • FLUKA simulations were performed by A Romanazzi to see what the impact of the air flowing from the UXC55 to the tunnel will be. • Boundary conditions: • Copper : 400W volume heat generation • Inlet : 20 Pa overpressure, 19°C • Outlet : 0 Pa overpressure • Steel : 19°C fixed temperature on outside wall outlet inlet Fixed temperature martin.gastal@cern.ch

  20. How to cool down the TAS? • Two configurations were studied: Without annular clapper With annular clapper martin.gastal@cern.ch

  21. How to cool down the TAS? • Conclusions and implementation • Active air cooling using the UXC55 nominal overpressure should be sufficient to keep the temperature of the TAS in a range acceptable for TE-VSC throughout its life time. • The temperature of the TAS will be monitored at all times by CMS DSS using thermocouples already installed by TE-VSC • The water cooling pipe installed on the tunnel face of the TAS has been tested up to 10Bars and would be available if needed • A first section of water pipes will be installed by EN-CV in the vicinity of both TASs shortly as an extra precaution. This would allow installing active water cooling without having to get near a potentially hot TAS martin.gastal@cern.ch

  22. When will the whole system be fully installed? • Deadline set by start of powering tests phase 2 in sector 56: 14/09 • Membranes are both manufactured and installed • Z-stops are being mounted on mock-up • Installation scheduled for Tuesday 01/09 • A dedicated EDMS page will be set up by 04/09; all relevant documents (text, pictures, simulations, models) will be stored at this location martin.gastal@cern.ch

  23. Seal UXC55 from tunnel →Holes between the CSF and the FIN have been closed →The resulting seal will withstand 110mBar →New system uses metal plates and blocks filled up with concrete martin.gastal@cern.ch

  24. Seal UXC55 from tunnel →FIN doors will be bolted and remaining gaps will be sealed by PH-CMX during week 36 martin.gastal@cern.ch

  25. Seal UXC55 from tunnel →Examples of jobs done by AGI →All ducts, cables and cables trays will be sealed to guarantee 20Pa between Tunnel and UXC55 martin.gastal@cern.ch

  26. Pressure resistant doors and ODH sensors Additional ODH sensors installation scheduled for week 36 5 pressure resistant fire proof doors have been installed All blast doors open towards the incoming pressure Remove existing door, include the UPX56 into the ventilated volume of the USC55 22/07/2008 martin.gastal@cern.ch martin.gastal@cern.ch 26

  27. After Before Installing pressure resistant doors: Responsibility matrix martin.gastal@cern.ch

  28. UPS54/56 doors • Door + frame + metallic structures: 100% Installed • Overpressure resistant cladding: 100% Installed • Fire resistant cladding: NA • Access control: 20% installed • Cables installed, instrumentation to be installed during week 36 • Ventilation: 50% installed • Former ducts removed, new ducts will be reinstalled during week 36 • including Fire/pressure clappers • Final air tightness: To be done during week 36 • RZ54 door • Door + frame + metallic structures: 100% Installed • Fire resistant cladding: 80% installed • Plaster boards to be installed during week 35 • Final sealing to be done during week 35 • Overpressure resistant cladding: 0% • to be installed during week 36 • Access control: 20% installed • Cables installed, instrumentation to be installed during week 36 • Ventilation: 90% installed • fans to be connected to power during week 35 martin.gastal@cern.ch

  29. UJ561 door • Door + frame + metallic structures: 100% Installed • Overpressure resistant cladding: 0% • to be installed during week 35 • Fire resistant cladding: 80% installed • Heat resistant mortar to be injected during week 34 • Plaster boards to be installed during week 35 • Fine sealing to be done during week 35 • Access control: 20% installed • Cables installed, instrumentation to be installed during week 36 • Ventilation: 90% installed • Fans to be connected to power during week 35 • UL55 door • Door + frame + metallic structures: 100% Installed • Overpressure resistant cladding: NA • Fire resistant cladding: 80% installed • Heat resistant mortar to be injected during week 34 • Plaster boards to be installed during week 35 • Access control: 20% installed • Cables installed, instrumentation to be installed during week 36 • Ventilation: NA martin.gastal@cern.ch

  30. 1st LTEX meetingProtecting the experimental caverns and personnel from a "sector 34 like" incident: work planned in the LHC tunnel • Conclusions:1- Modifications in the CMS TAS regions: • To be done by September 7th • 2- Sealing all remaining openings: • To be done by September 7th • 3- Pressure resistant doors and ODH sensors: • Fully equipped doors by September 7th martin.gastal@cern.ch

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