Electro-Mechanical Pat Jordan Feb 17, 2012

1. X-Ray Calorimeter ~ Concept Presentation ~ Electro-Mechanical Pat Jordan Feb 17, 2012

2. 1 3 4 2 Electro Mechanical Hardware 1) Filter Wheel 2) Aperture Door 3) GSE Micro Valve installed for ground testing remains in place for flight 4) Vent Door assumed to be identical to the aperture door Not required for mission success

3. Filter Wheel Assembly Overview: This assembly will provide the capability to move filters into the X-ray beam path. The main functions of these filters are to provide: Protection against meteorites (using Be positions) Protection against contamination (using Be positions) Reduce optical load from bright stars Optimize the science for bright X-Ray sources Capability to separate sky contributions from instrument background This filter wheel assembly also includes 2 electronically controlled modulated X-ray source (MXS) The filter wheel control electronics will be provided by the MEB

4. Filter Wheel Filter Wheel Baseline Reqts Baselined Astro-H Sources Filter Wheel and Flight Calibration Wheel to house six filter positions Cycles= Daily use with life of 20K actuations Cycle Time: TBD (60 sec) Alignment Reqts : Low positional reqts (10 arcmin) (within .2 MM) Power : 6W (CDA motor Spec) Mass : 4.69 KG per ASTRO H (2.04 kg FWE boxes has been removed and placed in MEB) Operational Temperature = -15 C to +55C tested design data shows (10X our life) Survival Temperatures = Not known at this time Volume/design concept (hardware List)- Using ASTRO H concept (non USA design) Motor detent is enough to hold position – (if slips, potentiometer to give position feedback) Mechanism design concept is outlined, but will need to be re-engineered with new technical data/drawing package. This design shows normal complexity with a design that has flown. “Fail safe” – FW structure to have a thin wall so FOV obstruction is minimized for failure. No launch Lock needed (as a detent maintains position) and using proven design concepts.

5. Concept layout Position Sensor Potentiometer or encoder Angular Contact Bearing Stepper Motor w/ planetary gear head and Pinion gear 2 Modulated X-ray Sources Housing Main Gears HVPS Filter Wheel Filter

6. Filter Design Conclusion • Using Astro-H filter wheel design concept. • We do not have the design technical data package from Astro –H and it needs to be developed for this specific applicaiton. I do not see anything that has not been done before. I see this mechanism being a TRL 5. • The Filters concept have flow before but are a special process that may have a long lead procurement time. • As with all flight motors, this should be looked at as being a long lead time component.

7. Aperture Door Overview: The aperture door will remain closed until instrument is in position ready to operate. The door is a one shot mechanism and includes redundant pryo-activated wire cutters to open the door. The perimeter of the door will have an o-ring that will accommodate a GSE bell jar seal for on ground testing

8. Aperture Door Door: Leak Rate of seal: 1.0 E-8 He/cc3/sec (Use O-ring)(not including permeation) I ATM pressure Aperture Size: 78 mm Cycles: 2 (safety Factor = 5) Power: Motor actuator 5W (each and use 2) Operational temperature: TBD (-15 C to +55C ) Volume/design concept (hardware List)- Per existing Astro H concept Baseline Concept Two actuator door release units Torsion spring actuator must break sticking and open 150+degrees Seal to be an O-Ring – Seal Force be per O-ring vendor specs Low shock release with dampening (one time) Cam roller hold down / release system Will require GSE for instrument testing to reset cover- Need O-ring seal for the GSE Bell Jar

9. Door Open Swing Door Power 5 watts /actuator (If same time 10 Watts) Door Assy Mass about 2.1 kg nor including baseplate Actuation motor assy Paraffin actuator: Vendor data Cutter or a release assy (2) = Cam with roller hold down Hardware 7.0 inches to clear (178 mm) Assume a 5 in diameter door 5.0” Stack –up = 6.62 inches 0.38” 0.38” 0.38” 0.5” Door release Mechanism Torsion Spring Door w/ O-ring seal

10. - This Aperture door mechanism concept has flown on Astro-H. - We do not have the design technical data package from Astro-H for this design and it needs to be developed specifically for this application. I do not see anything unusual about this concept and the mechanisms has flown before. I see this design to be a TRL 5. - May look at a Trade to develop a low profile slide valve, as this would minimize the required clearance between the dewar and the filter wheel housing, which could diminish the size of the filters in the filter wheel, and the overall cost. - As with all flight motors, this actuator should be looked at as being a long lead time component. Summary of Aperture door

11. Micro Vent Valve

12. Micro Vent Valve This Micro Valve is used to regulate pressure between aperture door filter Common pressure on each side of filter. Aperture Door Use Existing Micro Valves with flight heritage. Used on GSFC, SAM instrument Mass: 27 g Power (GSE controlled only): 18V, 2 amps Vent valve used during ground testing only. This valve will fly but control electronics will be GSE only (and not fly).

13. Vent Door Plan to use a similardesign as the aperture door shown for ASTRO-H Note design can be optimized to a smaller version as requirements are fine tuned