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Thermal aspects

Thermal aspects. Cooling for CLAS-DVCS => HPS ECAL Based on «  Thermal design for the CLAS-DVCS calorimeter  » September 2004. Copper serpentines on the thermal enclosure. Flow map inside the DVCS ECAL. ECAL bottom. Preamps. ECAL top. Preamps. Beam. Flow split.

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Thermal aspects

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  1. Thermal aspects Unité mixte de recherche CNRS-IN2P3 Université Paris-Sud 1191406 Orsay cedex Tél. : +33 1 69 15 73 40 Fax : +33 1 69 15 64 70 http://ipnweb.in2p3.fr

  2. Cooling for CLAS-DVCS => HPS ECAL Based on « Thermal design for the CLAS-DVCS calorimeter » September 2004 Copper serpentines on the thermal enclosure Flow map inside the DVCS ECAL ECAL bottom Preamps ECAL top Preamps Beam Flow split NESLAB chiller RTE740 ~700 W cooling capacity@17°C 3 L/mn @ 0.5 bars Flow map inside the HPS ECAL => minimize the pressure drop to get low delta T°

  3. Top cover and cradle P = 5.83 W Outside temperature : 30°C with low fan air Evacuation of air Back covers and plate P=5W Convection exchange coefficient h = 7.59 W/m².K Transient cooling of crystals in some hours P = 11.5 W Front plate P = 2.31W 53 W of heating power by electronics preamplifiers Cooling panel in the center The crystals are stabilized at 18°C Radiation P = 4 W Back plate with serpentine = thermal shield Circulation of cooled nitrogen at low flow Links with outside (mother board, supports P = 5W) Thermal components and amounts of thermal power to dissipate by cooling system The total power of this system is 86.7 W All elements in blue are cooled at 17°C minimum to obtain 18°C on crystals Power summary for CLAS-DVCS => update for HPS ECAL Based on « Thermal design for the CLAS-DVCS calorimeter » September 2004 Power summary for the HPS ECAL ECAL top Preamps Transient cooling of crystals in some hours P = 5.75 W 26.5 W ECAL bottom Preamps Front plates P=2.3W Transient cooling of crystals in some hours P = 5.75 W 26.5 W Radiation P=5W Covers P=12.4W Links with outside (mother board, supports) P = 5W Total ~89W for the HPS ECAL

  4. Schedule Unité mixte de recherche CNRS-IN2P3 Université Paris-Sud 1191406 Orsay cedex Tél. : +33 1 69 15 73 40 Fax : +33 1 69 15 64 70 http://ipnweb.in2p3.fr

  5. 1 ECAL DVCS = 2 ECAL HPS + Vacuum chamber Still lots of things to integrate. It is not forgotten !! Alignment targets with the JLAB laser tracker Thermal sensors ….

  6. Schedule

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