Opto-Mechanics for SNAP at UMOpto-Mechanics for SNAP at UM

B. C. Bigelow, UM Physics

10/6/04

210/6/04 B. C. Bigelow - UM Physics

Opto-Mechanics for SNAP at UMOpto-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

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Focal Plane MosaicsFocal 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

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Previous FPA experience - IMACSPrevious FPA experience - IMACS

67 Mpx mosaic fully assembled

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Previous FPA experience - IMACSPrevious FPA experience - IMACS

NGC 2359, 15x15 arcmin

610/6/04 B. C. Bigelow - UM Physics

Large FPM reviewLarge FPM review

ACIS (AXAF Charge-coupled Imaging Spectrograph)

710/6/04 B. C. Bigelow - UM Physics

Large FPM reviewLarge FPM review

Kepler focal plane mosaic – 90 Mpx

810/6/04 B. C. Bigelow - UM Physics

GAIA astro focal plane mosaicGAIA astro focal plane mosaic

GAIA astro focal plane, 180 CCDs, 2000x4500 px – 1.6Gpx

910/6/04 B. C. Bigelow - UM Physics

GAIA astro focal plane mosaicGAIA astro focal plane mosaic

First GAIA development detectors have been delivered

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Focal Plane MosaicsFocal 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

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H2RG package – 3 flat mounting pads and two locating pins

MCT packaging designsMCT packaging designs

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Discrete filter/aperturesDiscrete filter/apertures

H2RG package with filter frame, filter, and aperture mask

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IR sub-moduleIR sub-module

Sub-array with CRICs, flex circuits, connectors, local IR electronics (cold), sub-plate heater

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Focal plane fully populatedFocal plane fully populated

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SNAP structuresSNAP 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

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Secondary Support StructureSecondary Support Structure

Secondary mirror support FEA model

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TMA-63 telescope structureTMA-63 telescope structure

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TMA-65 telescope structureTMA-65 telescope structure

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TMA-65 telescope structureTMA-65 telescope structure

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Spectro installedSpectro installed

FP assembly with spectrograph included (note redundant str.)

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SNAP opticsSNAP 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)

2210/6/04 B. C. Bigelow - UM Physics

Misc. opto-mechanicsMisc. opto-mechanics

Other sub-systems:

• Alternative shutter designs

• Alternative telescope baffles

• Calibration systems, projector optics, sources (LEDs)

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Alternate shuttersAlternate shutters

Rotating barrel shutter

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Baffles fully enclose optical system, FPA

Telescope lower baffleTelescope lower baffle

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Future workFuture 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