close cycle dilution for space
DESCRIPTION
Close Cycle Dilution for Space. Ph. Camus, G . Vermeulen, G. Chaudhry, A. Benoit, F. Martin B-POL Workshop, IAP Paris, 29th July 2010. Planck Open D ilution S ystem. Planck System Performances. Planck system provide 1.6K and 100mK cooling stages from a 4.5K cooler - PowerPoint PPT PresentationTRANSCRIPT
Close Cycle Dilution for Space
Ph. Camus, G. Vermeulen, G. Chaudhry, A. Benoit, F. Martin
B-POL Workshop, IAP Paris, 29th July 2010
Planck Open Dilution System
Planck System Performances
• Planck system provide 1.6K and 100mK cooling stages from a 4.5K cooler
• Cooling power of 400mW @1.6K and 0.2mW(*) @100mK• Isotopes flow of 18 mmol/s 4He and 6 mmol/s 3He• Needs HP (285 Bar) storage ( 4 X 50L ) for 2 years• Critical pneumatical system for flow control and maintain a
high purity• Full integration of the heat exchanger with the focal plane
and the wires ( thermalization )
(*) + thermalization power of the FP supports and the wires between 1.6K and 0.1K
CCDR Concept
Separation and performances at high 4He flow (F.Martin PhD thesis, 2009)
BLISS Study
• Mass Budget– Cold H/W (including IOB)< 150 kg
• 50 kg for SAFARI
• Thermal Budget– 15 mW @ 4.5 K (FPI Total)– 5mW @1.7K (FPI Total)
• Volume• FPI Position• Warm Electronics
Double stage ADR solutionGrating Spectrometers + screens > 9kg at 50 mK !0.4 mW at 50mK
Carbon fiber supports
Advantage to C/F rods
4K stage
1.7K stage
300mK stage
50mK / instrumentsC/F rods
Screens
Heat intercept between 300-50mK
200 mmol/s 4He30 mmol/s 3He
W/O locking system for launch !
System aspectsCryo device integrated functions :- Cooling detectors- Instrument support- Part of the read/out chain (cables thermalization /
cold amplifiers ) ?
3Helium circulation (30 mmol/s - 5/200 mBar)• Cold pump• Room temp pump
• Isotopes storage• Integration (Planck-like)
Solutions for 3He pump
• Space qualified mechanical pumps– JAXA JT3HE compressor adaptation– Thales PT compressor adaptation– High speed drag pump
• Cryo pump– Twente development for Darwin
=> The two options will kept
High speed drag pumpCreare technology (space qualified)Technical proposal under discussion200000 RPMGas bearing
Adixen commercial productCEA/AirLiquide design study60000-120000 RPMMag bearings
Cryogenic pump
•Darwin H2 JT system•Design adaptation for the dilution•Need a check valve adaptation for low pressure•Acceptable heat load at 15K/50K (100mW)
Conclusions
• Cooling performances achieved 1mW @ 50mK (TRL3-4)
• Re-use of the BLISS case for B-POL• Need to have a complete engineering model– 0 G still demonstration– Pump choice / development (prob. Two solutions)
• Supported by Cnes (PhD A. Volpe) and ESA (ITI)• Objective TRL4 in June 2011