Thermal Control of IR detector

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Presentation transcript:

Thermal Control of IR detector Roger Haroutunian (IPNL,Lyon) CNRS (IN2P3,INSU) FRANCE

Specifications of elements Main specifications of thermal elements Temperature changes < 1 °/mn Range of variation from 90K to 140K Stability November 15 & 16, 2005 Roger Haroutunian

Overall view COLD PLATE TROUGHPUT SPACERS (for strips) THERMAL SCREEN November 15 & 16, 2005 Roger Haroutunian

Thermal control Thermal damping November 15 & 16, 2005 Roger Haroutunian

Thermal control Heat Sources/Sinks Neglected Damping fiberglass supports Copper strips/connecting Kapton (100 lines (15µm x 120µm) : - From Moly support to thermal screen (5cm) - From Thermal screen to (15cm) Black body radiation vessel screen + cold plate 9.2W Neglected N2 Transfer lines Cold finger for detector protection against dust Kapton conduction Detector and electronic November 15 & 16, 2005 Roger Haroutunian

Thermal control Uncertainties Quality of thermal connection at interfaces Evolution of conductivity and capacity as a function of temperature ( Litterature may be off. ) November 15 & 16, 2005 Roger Haroutunian

Schematic layout Al Cold plate (77K ) 3 Fiberglass supports Copper strips Al Cold plate Al Cold Plate Cooling spacers Thermal damping Moly support Thermal screen (77K ) Pressure vessel November 15 & 16, 2005 Roger Haroutunian

Input power (Impact/Moly support) Watts Effect DT (Moly) T=140K Radiation 9.2W N2 consumption Support conduction <1.4W Strips/ Connections T(Mo) -0.065 +0.006 Vacuum (10-5 Torr) ~0.0001 November 15 & 16, 2005 Roger Haroutunian

Power:parameters Radiation from vessel Steal: emissivity 0.11 (300°K) -Assume all power absorbed by cold plate/thermal screen -Value is overestimated : -geometry -thermal screen (Al) with good reflectivity, reducing absorbed power Main source of N2 consumption Thermal damping support : ~ 1,4 W impact/N2 consumption (conduction) no effect/Moly temperature November 15 & 16, 2005 Roger Haroutunian

Power:parameters Strip conduction From cold entry point (spacer) to Molybden: modifies the operating temperature From room temperature to cold entry spacer N2 consumption Heating Resistors from 0 to 500 mW T regulation Power for H1RG ~ a few mW Vacuum heat power linear with pressure WARNING / uncontrolled vacum loss: no safety slow vaccum loss : no safety system implemented November 15 & 16, 2005 Roger Haroutunian

Thermal control M(Moly) =370g Heating resistors P_Moly~100mW(90K) November 15 & 16, 2005 Roger Haroutunian

N2 Consumption 1.4 l TOTAL to cool cold plate to ~140K 0.2 l/h to stabilize the temperature Insensitive to Power flux on Moly Cooling stopped November 15 & 16, 2005 Roger Haroutunian

Connecting strips Kapton fiberglass spacers(4022) 1 spacer on cold plate 1 spacer on thermal screen Red curve : fiberglass temperature Perfect thermal contact assumed November 15 & 16, 2005 Roger Haroutunian

T variation rate tuning Molybden Mass Damping spacers A/L Les paramètres d’ajustement principaux sont - Les dimensions des amortisseurs - Masse du support de molybdene November 15 & 16, 2005 Roger Haroutunian

Summary Temperature variation rate < 1K/mn Requested range covered (90K to 140K) Heating power from 0 to 500mw (>> electronic power) Molybden mass will ensure appropriate stability System can be tuned if needed Moly mass increased to 500g Size of damping spacers adapted November 15 & 16, 2005 Roger Haroutunian