1. Opto-Mechanics for SNAP at UM
B. C. Bigelow, UM Physics
10/6/04

2. Opto-Mechanics for SNAP at UM
Overview of talk:
Design of focal plane mosaic components and assemblies
Design and analysis of telescope and instrument structures
Optics – support of optics specifications and procurement
Design of misc. mechanics and sub-systems
10/6/04
B. C. Bigelow - UM Physics

3. Focal Plane Mosaics Focal Plane Mosaics: Previous experience with FPM
Large focal plane mosaic review for SNAP
MCT and CCD packaging designs and FEA
Design of discrete filter frames, aperture masks
Design of sub-arrays and FPM assemblies
More at
10/6/04
B. C. Bigelow - UM Physics

4. Previous FPA experience - IMACS
67 Mpx mosaic fully assembled
10/6/04
B. C. Bigelow - UM Physics

5. Previous FPA experience - IMACS
NGC 2359, 15x15 arcmin
10/6/04
B. C. Bigelow - UM Physics

6. Large FPM review ACIS (AXAF Charge-coupled Imaging Spectrograph)
10/6/04
B. C. Bigelow - UM Physics

7. Kepler focal plane mosaic – 90 Mpx
Large FPM review
Kepler focal plane mosaic – 90 Mpx
10/6/04
B. C. Bigelow - UM Physics

8. GAIA astro focal plane mosaic
GAIA astro focal plane, 180 CCDs, 2000x4500 px – 1.6Gpx
10/6/04
B. C. Bigelow - UM Physics

9. GAIA astro focal plane mosaic
First GAIA development detectors have been delivered
10/6/04
B. C. Bigelow - UM Physics

10. Focal Plane Mosaics Focal Plane Mosaics: Previous experience with FPM
Large focal plane mosaic review for SNAP
MCT and CCD packaging studies
Design of discrete filter frames, aperture masks
Design of sub-arrays and FPM assemblies
Files at
10/6/04
B. C. Bigelow - UM Physics

11. MCT packaging designs
H2RG package – 3 flat mounting pads and two locating pins
10/6/04
B. C. Bigelow - UM Physics

12. Discrete filter/apertures
H2RG package with filter frame, filter, and aperture mask
10/6/04
B. C. Bigelow - UM Physics

13. IR sub-module
Sub-array with CRICs, flex circuits, connectors, local IR electronics (cold), sub-plate heater
10/6/04
B. C. Bigelow - UM Physics

14. Focal plane fully populated
10/6/04
B. C. Bigelow - UM Physics

15. SNAP structures Design and analysis of structures:
Space frames and trusses for OTA
Fold and tertiary support trusses
Focal plane support truss
Spectrograph support truss
Athermal struts
Composite truss nodes
Files at
10/6/04
B. C. Bigelow - UM Physics

16. Secondary Support Structure
Secondary mirror support FEA model
10/6/04
B. C. Bigelow - UM Physics

17. TMA-63 telescope structure
10/6/04
B. C. Bigelow - UM Physics

18. TMA-65 telescope structure
10/6/04
B. C. Bigelow - UM Physics

19. TMA-65 telescope structure
10/6/04
B. C. Bigelow - UM Physics

20. Spectro installed
FP assembly with spectrograph included (note redundant str.)
10/6/04
B. C. Bigelow - UM Physics

21. SNAP optics
Optics:
Supporting development of telescope optics specifications
mirror figure specifications
mirror AR coatings
Opto-mechanics for mirrors
fold mirror models
Participating in TDM/TPF-C mirror design reviews
at request of M. Lampton and E. Cohen (JPL)
10/6/04
B. C. Bigelow - UM Physics

22. Misc. opto-mechanics Other sub-systems: Alternative shutter designs
Alternative telescope baffles
Calibration systems, projector optics, sources (LEDs)
10/6/04
B. C. Bigelow - UM Physics

23. Alternate shutters Rotating barrel shutter 10/6/04
B. C. Bigelow - UM Physics

24. Telescope lower baffle
Baffles fully enclose optical system, FPA
10/6/04
B. C. Bigelow - UM Physics

25. Future work Focal Plane Mosaic
Preliminary design (detector packages, sub-assys, baseplate)
Fabricate prototype parts, vibration and/or thermal testing?
Telescope Structures
m telescopes
Detail design of nodes, optics interfaces
Carbon-fiber prototypes (nodes, struts, structures)
Optics
TDM/TPF-C developments, design reviews
Review of commercial design studies
Site visits to optics/OTA vendors
10/6/04
B. C. Bigelow - UM Physics