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Build to Cost Meeting: Major NGAO system cost savings ideas

Build to Cost Meeting: Major NGAO system cost savings ideas. Don Gavel NGAO Team Meeting September 11-12, 2008. Performance Space. Shrink performance along axes to cut costs Not necessary to cut all axes uniformly Know the consequence of each reduction Science Impact

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Build to Cost Meeting: Major NGAO system cost savings ideas

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  1. Build to Cost Meeting:Major NGAO system cost savings ideas Don Gavel NGAO Team Meeting September 11-12, 2008

  2. Performance Space • Shrink performance along axes to cut costs • Not necessary to cut all axes uniformly • Know the consequence of each reduction • Science Impact • Marginal Cost Reduction • Decide what is a “core” defining NGAO that fits the cost cap and is still worth the cost Wavelength Strehl Sky Coverage Field of View (Regard) Contrast Sensitivity / Throughput / Emissivity Multiplicity of Instruments

  3. Major Cost Savings Scopes • Cut Laser Power – by a third?, by one half? • Eliminate wide field d-IFS, concentrate science in 30 arcsec field • 6 LGS, 3 roving for point and shoot, 3 are fixed • Remove one of the two AO relays • Fewer optomechanical components • Improved throughput • Not split-relay • Pare down or eliminate the “switchyard” • Reduced number of instruments • One focal plane (shared for science & LOWFS) • Reduced number of dichroics and changers • Reduce automation • Sacrifice “instant” configurability

  4. More Cost Savings Scopes • Cut number of instruments • Refurbish and reuse OSIRIS • Combined visible/IR sensor in imager • Pare down dIFS multiplicity – one dIFS? Two dIFS with shared dewar? • Purchase science imagers from commercial supplier • Live with specs from off-the-shelf design • Make the opto-mechanics physically small • Off-the shelf optics and mounts • Smaller space to enclose and cool • Cut number of actuators • Trade with other error budget elements to minimize impact • Limiter: short wavelength coverage

  5. Even More Cost Saving Scopes • Accelerate the project plan • “Then-year” dollars loose value over time (with inflation) • Not necessary to finish earlier, just spend earlier – maybe by overlapping portions of design and FSD phases • Reduce technical risk • Targeted prototyping and simulations • Avoid overruns due to rework of uncertainty/untested systems failing to meet expected performance on first implementation

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