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CAGIRE – Preliminary mechanical design – 08062010 Requirements Requirements Cooling system with cryocooler machine Î T° @ detector : 130/140°K (TBC) during 6 months Vacuum : pumping station & getter (ion pump) Î P<1E 3 mbar during 6 months (no active pumping) Î P<1E3 mbar during 6 months (no active pumping) Mechanical: Total mechanical parts : 15kg ± 5kg TBC Cryocooler machine : 10kg Cryocooler machine : 10kg ÎTOTAL MASS : 25kg TBC Dynamic : The center of detector focal plane and the cryostat’s inertia axes are aligned with the center of gravity of cryostat Î alignment with telescope focal plane Î dynamic behavior

CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

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Page 1: CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

CAGIRE – Preliminary mechanical design – 08‐06‐2010

RequirementsRequirementsCooling system with cryocooler machine

T° @ detector : 130/140°K (TBC) during 6 monthsVacuum : pumping station & getter (ion pump)

P<1E 3 mbar during 6 months (no active pumping)P<1E‐3 mbar during 6 months (no active pumping)

Mechanical:Total mechanical parts : 15kg ± 5kg TBCCryocooler machine : 10kgCryocooler machine : 10kg

TOTAL MASS : 25kg TBC

Dynamic :The center of detector focal plane and the cryostat’s inertia axes are aligned with the center of gravity of cryostat 

alignment with telescope focal planedynamic behavior

Page 2: CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

Cryostattop housing

Thermal housing

Detector and cryoboard asssembly

Data, heater and HK Interface

Cryostatbottom chamber

CryocoolerRicor K535

Cryostat window

Vacuum elementsc onnections

Exploded view of cryostat

Page 3: CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

Cut view of CAGIRE CRYOSTAT

Insulating feet baseplate

Thermal housing

OFHC cold head interface

Cryocooler col head

Page 4: CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

Detector and cryoboard assembly (with housings)

Detector housings

Cryoboardhousings

Detector OFHC thermal strap

Cryoboard OFHC thermal strap

Epoxy insulatingcryoboard feet

Epoxy insulatingdetector feet

Page 5: CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

F1 FLEX 

Detector and cryoboard assembly

Detector baseplate (molydenum)

(1.6’’ length)

Cryoboard thermal strapconnected on cryoboard

F2 Flex(15’’ length)

Cryoboardbaseplate

detector thermal strapdetector thermal strapconnected on detector baseplate

Two separated mountings:One isolated mounting for detectorOne isolated mounting for cryoboard assemblyNo contact between the two mountings excepted Flex F1

Two separated thermal regulation 

Page 6: CAGIRE – Preliminary mechanical design –0806 2010 · CAGIRE – Preliminary mechanical design –08‐06‐2010 Not shown / to be done: •Cables forfor HKHK , heatersheaters

CAGIRE – Preliminary mechanical design – 08‐06‐2010

Not shown / to be done:

•Cables for HK heaters warm up•Cables for HK , heaters, warm‐up•Heater & warm up•Interface board for hermetic flange connection (Hirose connector to XAVAC 104 High density)•Hermetic flange (drawing delivered by subcontractor)•External electronic board interface, mounting & connections•Vacuum system elements connections and identification•F2 flex cable retainer (for thermal insulation)•Screws sealing joints•Screws, sealing, joints,…•Others.