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Module to Disc Assembly

Module to Disc Assembly. Infrastructure Services and test box Evaporative cooling system Disc Handling Tests on disc 9 Redundancy link results Cooling performance Current Inventory Future plans. Infrastructure. Services and test box Optical Fibres and DCS in place

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Module to Disc Assembly

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  1. Module to Disc Assembly • Infrastructure • Services and test box • Evaporative cooling system • Disc Handling • Tests on disc 9 • Redundancy link results • Cooling performance • Current Inventory • Future plans UK-V RAL 8th September 2004

  2. Infrastructure • Services and test box • Optical Fibres and DCS in place • Test cables terminate in patch panels allowing the connection to PPF0 through a short length of ribbon cable • Test box is equipped with simple removable aluminium covers front and back UK-V RAL 8th September 2004

  3. Evaporative cooling system • 4 heat exchangers have been constructed • Pipe-work, valves and distribution blocks have been installed • Connections are made using flexible stainless steel pipe-work • Leak testing is very time consuming! UK-V RAL 8th September 2004

  4. Disc Handling • The disc handling jig using the crane has been modified to optimise the smooth attachment and removal of discs for both the mounting tooling and the test box • Further modification will be required for transferring the disc to and from the tooling to mount the disc in the end-cap cylinder UK-V RAL 8th September 2004

  5. Redundancy Link Results • The inclusion of the redundancy links on disc 9 introduced additional noise • Investigations identified the following improvements • Replacement of a 5kW resistor in the ground line with 0W • An improvement in the redundancy link grounding • For a full report see http://hep.ph.liv.ac.uk/~ashley/Disk9_results_050804.pdf UK-V RAL 8th September 2004

  6. Extracts from the report UK-V RAL 8th September 2004

  7. Results with 0W resistor + new links still show a distortion at~ 0.3 fC Occupancies look OK UK-V RAL 8th September 2004

  8. Cooling Performance • The cooling system tests have involved running the Cold Room with a low dew point (<-25C) but operating at room temperature • Test box is flushed with dry air • The evaporative cooling for Disc 9 was turned on quadrant by quadrant (no power load) • Each quadrant will cool down to –25C but when all four operate together one quadrant was not cooled efficiently • The suspect heat exchanger has been replaced • All quadrants now cool together to –25C • Need to check performance with power on all quadrants UK-V RAL 8th September 2004

  9. One problem is that the programmed switch-off mode for the cooling rig allows the temperature to fall to –40C • Simple cure is to enter the cold room very briefly and close valves feeding the disk • Can also investigate possibility of modifying the code in the controller • 8 Hybrids and 4 modules were mounted without thermal grease, powered and clocked with ambient temperature of ~20C • the hybrids temperatures varied between 6C and 13C (Ambient in test box ~ +10C) • Hybrids ran cooler ~ 6C-8C, modules at ~12C-13C • Modules with grease run ~ 5C cooler (ambient ~ 20C) UK-V RAL 8th September 2004

  10. Current Inventory • Disc 9C has been accepted and is in use • Disc 8C has arrived and is awaiting acceptance tests • Disc 7C is expected next week • In terms of modules we currently have in Liverpool • 171 (Good + Pass) outer modules • 76 (Good + Pass) Middle modules • 15 Outers and 29 Middles being processed UK-V RAL 8th September 2004

  11. Future Plans • There is a proposal to mount the least good modules on Disk 9 (~10 bad channels) • Next step is to mount all the lower modules using correct tooling and thermal grease • Electronic characterisation • Thermal tests with thermal camera • Mount the remaining modules and characterise a completed disc • In parallel perform acceptance tests on discs 8 and 7 UK-V RAL 8th September 2004

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