SNAP Telescope SPIE 2002 4849-29

SNAP Telescope SPIE 2002 4849-29

Opto-Mechanics for SNAP at UM B. C. Bigelow, UM Physics 10/6/04 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 2 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 http://www.physics.lsa.umich.edu/bigelow/snap/index 10/6/04 B. C. Bigelow - UM Physics 3 Previous FPA experience - IMACS

67 Mpx mosaic fully assembled 10/6/04 B. C. Bigelow - UM Physics 4 Previous FPA experience - IMACS NGC 2359,

15x15 arcmin 10/6/04 B. C. Bigelow - UM Physics 5 Large FPM review ACIS (AXAF Charge-coupled Imaging Spectrograph)

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

B. C. Bigelow - UM Physics 7 GAIA astro focal plane mosaic GAIA astro focal plane, 180 CCDs, 2000x4500 px 1.6Gpx 10/6/04 B. C. Bigelow - UM Physics

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

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 http://www.physics.lsa.umich.edu/bigelow/snap/index 10/6/04

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

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

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 13 Focal plane fully populated

10/6/04 B. C. Bigelow - UM Physics 14 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 http://www.physics.lsa.umich.edu/bigelow/snap/index 10/6/04 B. C. Bigelow - UM Physics 15

Secondary Support Structure Secondary mirror support FEA model 10/6/04 B. C. Bigelow - UM Physics 16 TMA-63 telescope structure

10/6/04 B. C. Bigelow - UM Physics 17 TMA-65 telescope structure 10/6/04

B. C. Bigelow - UM Physics 18 TMA-65 telescope structure 10/6/04 B. C. Bigelow - UM Physics 19

Spectro installed FP assembly with spectrograph included (note redundant str.) 10/6/04 B. C. Bigelow - UM Physics 20 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 21 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 22 Alternate shutters Rotating barrel shutter 10/6/04

B. C. Bigelow - UM Physics 23 Telescope lower baffle Baffles fully enclose optical system, FPA 10/6/04 B. C. Bigelow - UM Physics

24 Future work Focal Plane Mosaic Preliminary design (detector packages, sub-assys, baseplate) Fabricate prototype parts, vibration and/or thermal testing? Telescope Structures 2.25 - 2.5m 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 25

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