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X-Ray Calorimeter ~ Concept Presentation ~

X-Ray Calorimeter ~ Concept Presentation ~. Mechanical David Robinson/543, Dave Palace/547 Feb 17, 2012. Mechanical Status. Put together a CAD model of the XMS by combining elements from: 2008 Con-X Study Cryocooler

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X-Ray Calorimeter ~ Concept Presentation ~

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  1. X-Ray Calorimeter ~ Concept Presentation ~ Mechanical David Robinson/543, Dave Palace/547 Feb 17, 2012

  2. Mechanical Status • Put together a CAD model of the XMS by combining elements from: • 2008 Con-X Study Cryocooler • 2011 Athena Dewar, re-scaled. Some features & dimensions per Astro-H Dewar. • Shell distance per Mike Dipirro’s recommendations (DMS-OVCS = 50mm, OVCS/IVCS = 38mm, IVCS/-4.5K = 50mm) • 2011 Athena Detector Assembly • 2012 Astro-H ADRs • Added the following: • Neck region on DMS for Aperture Assembly filter • Gate valve on DMS aperture • Filter wheel above DMS aperture (attached to s/c) • SQUID box to interface with 12 connectors in DA. • (flat donut shape, underneath DA, on main plate) • Four ports on side of DMS (He fill/vent ports, Gate valve for venting in orbit, manual vent valve) • Helium loop around 4.5K shell, traveling to the He fill/vent ports • Internal 3 support bipods from DMS inner surface to the 4.5K shell (S-Glass struts, alum end fittings). Notional design • Radiators • 2 Cryocooler compressors and one displacer (“cold finger”) on back end of dewar

  3. Instrument on Spacecraft • Dewar Main Shell is 50 cm diameter, 82cm tall. • Electronics box arrangement is notional. • Dewar total height from s/c deck is 130 cm. • Attached to spacecraft deck via four bipods. • Radiator locations notional Everything TRL 6+ Filter wheel

  4. Block Diagram - Cryostat x-rays Aperture cover KEY filters Detector 50 mK stage main shell Calorimeter/ADR insert Vent valve Focal Plane Assembly (FPA) at 50mK 50 mK filters conductive bond Microcalorimeter SQUID readout amplifiers Antico detector thermal link heat switch 3-stage Adiabatic Demagnetization Refrigerator (ADR) superconducting cable ADR Stage 1 cryostat shells 4K SQUIDs & termination resistors ADR Stage 2 Calorimeter/ADR Insert 0.6K Detector Control ADR Stage 3 1.3 K Custom cryostat encloses the FPA and ADR, as well as the readout amplifiers ADR Control 4.5 K JT stage 18 K 75 K 260-300 K cold head Loop Heat Pipe to radiator Commercial Cryocooler Cryocooler Compressors

  5. Dewar Concept Displacer cools 4.5K shell Gate valve ADR 1, 2, 3 Baseplate (22 cm dia) Detector Assy Aperture Assembly Gate valve X-ray beam Cryocooler Deck on flexures DMS OVCS (75K) IVCS (18K) 4.5K Shell Helium fill/vent valves (cools 4.5K shell during I&T) S-Glass Bipod struts support the shells from DMS to 4.5K baseplate Bipods 580 mm detector to filter wheel 200 mm DMS filter to s/c deck

  6. Aperture Cylinder • The aperture cylinder for ASTRO-H was designed and built in-house • We used the mass and materials breakdown from this design to parametrically cost a similar assembly for the 2012 design • It is intended that this assembly is delivered to the dewar vendor in piece parts to integrate with the final dewar integration steps • Our mass model reflects this hierarchy of integration • The filters in this assembly were costed using an ASTRO-H historic reference of cost provided by R. Kelley/662

  7. Aperture Assemblies • Aperture Assemblies are heritage designs from Astro-H. Each dewar shell needs a “window” to allow X-rays to pass through. • Dewar shape was optimized (added neck to dewar aperture) to simplify ApA structures. OVCS Carrier size ~60 mm diameter, mass ~185 grams

  8. FPA • This illustration is the proposed FPA design from the Athena documentation • We used this volume to size the cryostat enclosure • S. Bandler/662 provided a detailed mass breakdown that was used to derive our mass total • The composition by mass was derived from this breakdown to parametrically estimate the I&T to the FPA • It is intended that this assembly is integrated and tested at Goddard, and the cost estimate was based on a grassroots estimate derived by S. Bandler/662 and J. Chervenak/553 • Then the FPA would be integrated with the Goddard-developed ADR and delivered to the dewar vendor to be integrated with the cryostat assembly • Our mass model reflects this hierarchy of integration

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