Standardized CCD and MCT detector mounting configurations

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Presentation transcript:

Standardized CCD and MCT detector mounting configurations B. C. Bigelow, UM Physics 2/2/05

SiC Focal Plane Concept Consider SiC for focal plane baseplate SiC superior to Moly in virtually all material properties SiC has 5 times the specific stiffness, and 1/3 the density of Moly Standard detector packages with spring preload mountings allow use of current detector package materials No thermal compensator / flexure mounts required Space heritage for SiC material, and optically flat mirrors established Substantial weight savings for focal plane assembly, bipods, etc. 2/3/05 Bruce C. Bigelow -- UM Physics

SiC Focal Plane Concept Consider SiC for focal plane baseplate Material Properties Molybdenum SiC (CVD) E (GPa) 330.0 466.0 Yield (MPa) 415.0 470.0 Density (kg/m^3) 10220 3210 CTE (RT, PPM/K) 5.35 2.20 K (RT, W/mK) 138 300 2/3/05 Bruce C. Bigelow -- UM Physics

Bruce C. Bigelow -- UM Physics Focal Plane Concept CTE comparison (courtesy of Pat Jelinsky): 2/3/05 Bruce C. Bigelow -- UM Physics

SiC Focal Plane Concept 2/3/05 Bruce C. Bigelow -- UM Physics

SiC Focal Plane Concept 2/3/05 Bruce C. Bigelow -- UM Physics

SiC Focal Plane Concept Conclusions SiC is a viable option for focal plane baseplate Standardized detector packages are compatible with SiC Substantial weight savings are possible Lots more to do if SNAP project is interested in SiC: Add spectrograph, guider detectors, BITE optics, etc. Add cold shield, “concentrator” electronics, radiator interface, etc. Detailed design of baseplate FEA of baseplate 2/3/05 Bruce C. Bigelow -- UM Physics