Detector CoolingCERN, September 28, 2006

Jaak LippmaaHIP, University of Helsinki

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Cooling - Status

• thermal study

• integration with 220m pots

• integration in the tunnel

• radiation hardness

• Minutes - ”Jaak will coordinate this effort. Thermal modelling taken care by Berend at MSSL”

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Cooling – Thermal study

• Berend Winter from MSSL has done a preliminary model for the initial detector “plane”

• For a more detailed study we really need more input from:

• The hybrid design

• Electronics boards

• Detector housing

• Environmental gas

• Interface with the beam pipe

• Interface with the mechanics

• Materials budget

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Cooling – Integration with 220

• TOTEM has just modified and upgraded their RP cooling system which is now in a rather advanced stage – components ordered

• The system uses C3F8 fluorocarbon cooling• The system uses separated ”cooling plant” and cooling

units at the 220m stations. The ”cooling plant” is accessible even during LHC operation

• Integration poses certain challenges:• Additional load for the compressor• Installation of long tubes• Probably needs complete redesign of the ”cooling plant” and tubing• We still don’t know what we need

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Cooling – Integration with 220

Main design requirements:

Coolant C3F8

Expected heat load per single Pot 25 WDesign individual dissipation 50 WTotal design cooling capacity 1200 WMaximum ΔT between sensors and fluid 10 °CSilicon sensor operation temperature -15 °CFluid evaporation temperature -30 °CTotal design mass flow 40 g/s

• Engineering specification under approval on EDMS, Document No.778214

• Integration of the cooling pipes in the LHC tunnel are approved and archived in CDD, Drawing No. LHCF35000019

• Work scheduled in the last two weeks of October 2006 ( before the bake out of the LSS on the 6th November)

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Cooling – Integration with 220

• Do we really need this or can we settle with Peltier cooling!

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Cooling – Integration in the tunnel

• Once cooling solution has been chosen we can start looking for a place for the kit.

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Cooling – Integration in the tunnel

• Fairly good ideas exist in both ATLAS and TOTEM (installed coolant tubing 50 km and 2 km respectively) for fluorocarbon based cooling systems

• Criteria and market survey on available suppliers is presented in the document MS – 3265/EP/ATLAS

• Need to initiate contact with TS/CV (TS/LEA ??) to construct necessary work packages.

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Cooling – Radiation Hardness

• The evaporative cooling technology is inherently radiation hard

• In the vicinity of the beams we only have copper tubing and C3F8 gas

• Equipment manufacturers have been selected and approved by LHC

• Peltier coolers are in operation on spacecraft - specific tests and studies can be made after specs have been determined

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Proposals

• We need to set our work order, mailing lists, workgroups and their interaction and priorities

• Web based interactive environment for internal workgroup use, file store, messaging and publicity role for the experiment would really help. Indico is vital, but it fills only half of the role. Convenient IP based conferencing is a must

• Unfortunately this imposes more structure and administration to the FP420 enthusiasts