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LHC Cryogenics in UX85 and Strategy against radiations

LHC Cryogenics in UX85 and Strategy against radiations. S. Claudet, LHC cryogenics LHC Radiation days, 29-30Nov’07. Content. Introduction Specificities of UX85 cavern Impacts on cryo related components Proposed actions and status Summary. Introduction to LHC Cryogenics (1/3).

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LHC Cryogenics in UX85 and Strategy against radiations

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  1. LHC Cryogenics in UX85andStrategy against radiations S. Claudet, LHC cryogenics LHC Radiation days, 29-30Nov’07

  2. Content • Introduction • Specificities of UX85 cavern • Impacts on cryo related components • Proposed actions and status • Summary LHC Cryo in UX85 - 6th Radiation days

  3. Introduction to LHC Cryogenics (1/3) 8 x 18kW @ 4.5 K 1’800 sc magnets 24 km & 20 kW @ 1.8 K 36’000 t @ 1.9K 140 t He inventory LHC Cryo in UX85 - 6th Radiation days

  4. Special case Radiation as engineering constraints Introduction to LHC Cryogenics (2/3) Mostly sub-systems with COTS instrumentation LHC Cryo in UX85 - 6th Radiation days

  5. Introduction to LHC Cryogenics (3/3) Machine interface: From Rad-Hard sensors to Rad-Tol electronics in sheltered areas LHC Cryo in UX85 - 6th Radiation days

  6. Content • Introduction • Specificities of UX85 cavern • Impacts on cryo related components • Proposed actions and status • Summary LHC Cryo in UX85 - 6th Radiation days

  7. LHC cryogenics next to experiment and in service cavern LHCb – detector area Offset interaction point Shielding wall Electronics + CPU farm J. Christiansen LHC Cryo in UX85 - 6th Radiation days

  8. UX85: Simulated doses for single events (C. Theis & co-workers, EDMS 735075) LHC machine Cryogenic sub-systems Hadron fluence (E > 20 MeV) [cm-2] at the beam level (floor 0) after 10 years of LHC operation. A safety factor of 2 was included in the normalization. Complete technical assessment of the problem can be found in TS note 2006-001 LEA by A-L Perrot (EDMS 695442) LHC Cryo in UX85 - 6th Radiation days

  9. Radiation sensitive devices Level 1 wall cabinets stairs 5 6 7 8 9 10 11 12 cabinets QURC green fence fence DP/PA couplers and links (Siemens) Corner of the LHCb magnet NB: all measures are in cm Point 1 beam axis IP PLCs Schneider (Modicon) Thyristors PLCs Siemens S7-300 High frequency converters, Magnetic level controllers. Electro-pneumatic valves positioners 2 1 3 4 -x z UX85 Cryogenics Installation Frequent stops could be due to single events !!! LHC Cryo in UX85 - 6th Radiation days

  10. Content • Introduction • Specificities of UX85 cavern • Impacts on cryo related components • Proposed actions and status • Summary LHC Cryo in UX85 - 6th Radiation days

  11. Proposed actions endorsed by LHC project leader’s office LHC Cryo in UX85 - 6th Radiation days

  12. Sequence of actions to be taken (considering sensitivity of components and possible effects) LHC Cryo in UX85 - 6th Radiation days

  13. Radiation sensitive devices Level 1 wall cabinets stairs 5 6 7 8 9 10 11 12 cabinets QURC green fence fence DP/PA couplers and links (Siemens) Corner of the LHCb magnet NB: all measures are in cm Point 1 beam axis IP PLCs Schneider (Modicon) Thyristors PLCs Siemens S7-300 High frequency converters, Magnetic level controllers. Electro-pneumatic valves positioners 2 1 3 4 -x z UX85 Cryogenics Installation Ph. 1 Ph. 1 Ph. 1 Ph. 1 Ph. 2 A-L Perrot LHC Cryo in UX85 - 6th Radiation days

  14. UX85: Simulated doses for single events Safer zone, fluence reduced by about 200 Hadron fluence (E > 20 MeV) [cm-2] at the beam level (floor 0) after 10 years of LHC operation. A safety factor of 2 was included in the normalization. LHC Cryo in UX85 - 6th Radiation days

  15. Integration study Reserved for transport Proposal for valve actuators (Phase 2) Proposal for CCs MB cabinets and PLCs (Phase 1) CCs MB cabinets (NOW) UL84 US85 LHC Cryo in UX85 - 6th Radiation days

  16. Timing of actions to be taken • Long delivery items have been ordered last summer, delivery Jan’08 • Project for electrical cabinets remote PLC’s to be launched • Implementation as foreseen after hardware commissioning of P8 LHC Cryo in UX85 - 6th Radiation days

  17. Summary • Follow standard procedure (as we did for all other areas with similar problems) • Complete technical assessment of the problem can be found in TS note 2006-001 LEA by A-L Perrot (EDMS 695442) • We take reasonable precautions where we know there will be a problem : • Most sensitive components to be treated before LHC collisions at moderate energy (long delivery items ordered) • Radiation monitoring system in UX85 and US85 is in place & operational to assess real situation • For the cold compressors (critical elements of QURCS) no solution exist but fallback solutions will be prepared in case we need them Thanks to A-L. Perrot, T. Wijnands and P. Proudlock for help and support LHC Cryo in UX85 - 6th Radiation days

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