1. Detector Cooling CERN, September 28, 2006 Jaak Lippmaa HIP, University of Helsinki

2. FP420 Meeting at CERN, September 28-29, 20062 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”

3. FP420 Meeting at CERN, September 28-29, 20063 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

4. FP420 Meeting at CERN, September 28-29, 20064 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 C 3 F 8 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

5. FP420 Meeting at CERN, September 28-29, 20065 Cooling – Integration with 220 Main design requirements: CoolantC 3 F 8 Expected heat load per single Pot25 W Design individual dissipation50 W Total design cooling capacity1200 W Maximum ΔT between sensors and fluid10 °C Silicon sensor operation temperature-15 °C Fluid evaporation temperature-30 °C Total design mass flow40 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)

6. FP420 Meeting at CERN, September 28-29, 20066 Cooling – Integration with 220 Do we really need this or can we settle with Peltier cooling!

7. FP420 Meeting at CERN, September 28-29, 20067 Cooling – Integration in the tunnel Once cooling solution has been chosen we can start looking for a place for the kit.

8. FP420 Meeting at CERN, September 28-29, 20068 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.

9. FP420 Meeting at CERN, September 28-29, 20069 Cooling – Radiation Hardness The evaporative cooling technology is inherently radiation hard In the vicinity of the beams we only have copper tubing and C 3 F 8 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

10. FP420 Meeting at CERN, September 28-29, 200610 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