Maximizing GSMT Science Return with Scientific Figures of Merit. Maximizing value. Who are the interested parties? Scientist users Funding agencies What constitutes value to them? Scientific return Cost What gives greatest value? MAXIMUM SCIENTIFIC RETURN FOR COST. Quantifying value.
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Maximizing GSMT Science Return
Scientific Figures of Merit
MAXIMUM SCIENTIFIC RETURN FOR COST
Components of value
Science merit function = ( Wi x FOMi )
Type of mission impacts FOM, weights
Background limited, uncrowded field case
Gather terms into a Figure of Merit for (integration time)-1
Background limited, uncrowded field FOM
1/time [ (D2/2) • TPtel () • Etel] •
[ • DQE • TPtinstr() • Etinstr • f(/) • f(n) • f(, ) ]
Delivered image quality vs field angle and conditions
Tel, atmos rolloffs
Some performance (and cost) trades:
Comparison with enhanced seeing imager:
FOM for sensitivity (SNR):
sensitivity [ D2• TP• E • • DQE• -1 •f(/) • f(n) • f(, ) ]½
• [ S / (1-S) ] • [ D / d ]2 • [ 1/R ]
SNR limited by speckle structure in uncorrected halo
Variety of solutions
1/time ( previous expression )
Return to performance, cost, schedule, risk mix:
Is there a similar approach to maximizing value?
PCI = Science merit function / total cost (capital + ops)
How to do optimization?