1 Approved for public release, distribution unlimited Workshop on X­ Ray Mission Architectural C oncepts December 14-15, 2011 Approved for public release,

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Presentation transcript:

1 Approved for public release, distribution unlimited Workshop on X­ Ray Mission Architectural C oncepts December 14-15, 2011 Approved for public release, distribution unlimited ADR Options for Future X-Ray Missions Peter Shirron NASA/GSFC

2 Approved for public release, distribution unlimited Detector Cooling Requirements  Required temperatures and cooling power –Detector cooling: 50 mK (lower?), 2-5 µW –Amplifiers, heat intercept for detector wiring: 1-4 K, ~1 mW or more  Heat sink temperature –Cryocoolers will be used to provide cooling to <5 K Long life Support warm launch concepts Avoids complexity and risks of stored-cryogen systems Flight CryocoolersCryocooler TypeCryocooler Capability Sumitomo Heavy IndustriesJoule-Thomson with Stirling pre-coolers 1.7 K, 10 mW or 4.5 K, 40 mW Ball Aerospace, Northrup Grumman, Lockheed- Martin, Creare JT with Stirling, JT with Pulse tube, Pulse tube, Turbo- Brayton 4-5 K, mW

3 Approved for public release, distribution unlimited Cooler Options  Low Temperature cooler options (flight)Demonstrated capability – 3 He sorption cooler>200 mK –Dilution refrigeration (open cycle)100 mK –Adiabatic demagnetization refrigeration<20 mK  Can consider hybrid combinations  But… –ADRs are considerably more efficient than other options, and can span the range from 5 K –ADRs are more efficient than cryocoolers over the same temperature range From system perspective, it is advantageous to use ADRs over widest possible temperature range

4 Approved for public release, distribution unlimited ADR Basics  Magnetocaloric effect –Increasing magnetic field causes the refrigerant to warm up or give off heat; decreasing field causes it to cool down or absorb heat

5 Approved for public release, distribution unlimited ADR Architectures for 5 K Operation  Single-shot Operation  Benefits –Very stable temperatures during hold time –Each stage is a heat intercept for leads, etc. –Low magnetic fields present during detector operation  Drawbacks –Limited cooling power or large mass (or both)

6 Approved for public release, distribution unlimited ADR Architectures for 5 K Operation  Continuous Operation  Benefits –Continuous cooling at two temperatures –High cooling power per mass –High efficiency –Low peak heat rejection rate  Drawbacks –Fluctuating magnetic fields and temperatures during detector operation

7 Approved for public release, distribution unlimited 3-Stage ADR for Astro-H

8 Approved for public release, distribution unlimited 3-Stage ADR for Athena (reconfigured Astro-H ADR)  Designed for 2 µW detector load at 50 mK  Peak heat rejection rate of 20 mW at 4.5 K  15 kg total mass  Recycle time of <2 hours  Hold time of >30 hours  Duty cycle of >94%

9 Approved for public release, distribution unlimited 4-Stage CADR Prototype  Development funded by NASA targeting Constellation-X needs –5 µW detector load at 50 mK, with 100% margin –Maximum heat rejection rate of 10 mW at 4.5 K  Stage 1 works to stabilize detector temperature at 50 mK  Upper stages work to cascade heat to the heat sink

10 Approved for public release, distribution unlimited Prototype 4-Stage CADR  Up to 5 K heat sink  Total mass of 7.7 kg –1: 40 g CPA, 0.2 T –2: 100 g CPA, 0.5 T –3: 100 g CPA, 1.5 T –4: 60 g GLF, 4 T  Operation is fully automated

11 Approved for public release, distribution unlimited 4-Stage Cycling

12 Approved for public release, distribution unlimited Demonstrated Cooling Power and Efficiency  Peak heat rejection at 4.5 K is 8 mW  Cooling power represents available cooling above internal parasitics 6 µW

13 Approved for public release, distribution unlimited 5-Stage Prototype  Funded by GSFC IRAD –Development is on-going 2 stages cool continuously to ~1 K (~15 minute cycle) 3 stages cool continuously to 50 mK (~15 min cycle) Cryocooled heat sink at 4-5 K 1 K shield (removed for assembly)

14 Approved for public release, distribution unlimited Summary  ADR technology is well suited to requirements for future x-ray missions using low temperature detectors  Different architectures have been implemented –Single-shot ADR Requires minimum of 2 stages, but 3 stages provides greater cooling power and less mass More conventional Requires very little development from current state –Continuous ADR Requires 5 stages to achieve 2 fixed temperatures Highest cooling power Most efficient Lowest heat rejection rate – most compatible with cryocooler capabilities Requires some development to reach TRL 6 »Temperature stability of coldest stage