1. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source1 D.Kampf, Dr. Roland Graue Kayser-Threde GmbH

2. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source2 FPU Suspension Mechanical/thermal Decoupling: Isostatic Suspension with 6 Struts –X-Translation, Rotation about Z: 3 Struts –Z/Y - Translation and Rotation: 1 Strut/2 Struts Dimensions: –Cross Section/Length Ratio: 50 mm 2 /70 mm Material (Baseline): Stainless Steel for Struts and Fittings Mass (w/o contingency): 1.5 kg

3. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source3 Photoconductor Detector Suspension Mechanical/Thermal Decoupling: Isostatic Suspension with 6 Rods –X-Translation, Rotation about X : 3 Struts –Z/Y - Translation and Rotation : 2 Struts/1 Strut Dimensions: –Cross Section : 13 x 2 mm 2 –Length : approx. 40 mm excl. Fittings Material (baseline) : UD Kevlar 49 (0 o -Orientation) : Epoxi Matrix : Ti 6 Al - 4V Fittings Mass (w/o Contingency): 0.42 kg

4. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source4 Filter Wheel Assembly Design Unlimited Angle of Rotation 2 Preloaded, Dry, Gold coated Bearings (GRW) Rotor for 2 (optional 4) filters Cryotorquer Drive Total Mass: 0.580 kg Rotor Inertia: 0.11 gm 2 Dynamic Straylight Baffle

5. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source5 Filter Wheel Cryotorquer Drive Brushless Motor with Magnets Positioned at the Rotor Cryotorquer Drive Design: –12 Poles –24 Magnets (Samarium-Cobalt) –2 Phases (Each Redundant) –12 x 180 Cu-Coil Windings Stator with 4 Hall - Sensors, Two for Each of the Coil Package

6. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source6 FW Assembly

7. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source7 FW Bearing / Housing

8. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source8 Cross section of the motor

9. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source9

10. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source10 Part-winding 2 (Phase 2) Part-winding 1 (Phase 1) Arrangement of the coils

11. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source11 Principle of driving

12. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source12 Technical description

13. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source13 Filter Wheel Cryotorquer Drive - Cont‘d Temperature Range (op.): 3 - 313 K Rotor Positioning by One Hall Sensor (Red.) and One Magnet at Each Stop (Powerless Dormitory Mode During Measurement Time)

14. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source14 Cryotorquer Breadboard

15. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source15 Filter Wheel Torquer Status Breadboard Tested at LHe-Temperatures Torquer Constant: 0.3 Nm/A (Per Stator Package) Operational Current: 0.25 A (Per Phase and Stator Package) Power Dissipation: <10 mWs (per Position Change) : 25 mW (max)

16. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source16 Filter Wheel Assembly Mass: –Stator: 75 g – Rotor :265 g –Bearings : 20 g –Filter Wheel: 100 g –Mechanical Support: 120 g _________________________________________________________ Total (w/o Contigency):580 g

17. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source17 Flow diagram for Q-tests cryomotor

18. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source18 Calibration Sources Outer Diameter: 50 mm Aperture Diameter: 12 mm Temperature: 90 - 115 K Long Term Stability: 25 mK (13 bit Resolution) Mass (w/o contingency) : 0.14 kg (2)

19. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source19 Assembly

20. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source20 Baffle

21. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source21 PT500/1000 Suspension

22. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source22 Calibration Source Design Redundant Heat Source and Temperature Sensor (PT 100/ PT 500 tbc), 4 wire method Aluminum Semispheres Coated with Highly Reflective Surface (Ni, Gold) Highly Reflective Scatter Plate (Ni, Gold) with 200 µm rms Surface Roughness Collimating Source Mirrors to Increase the Flux Homogeneity

23. PACS IIDR 01/02 Mar 2001 FPU Struts, Filter Wheel, Calibration Source23 ICD Status