SGO Mid Minimum Cost 3arm6link LISAlike Mission Presented by Jeff Livas for the SGO Core Team Concept Description Rationale for the configuration Try to find lowest cost 6 ID: 794788
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Slide1
Space-based Gravitational-wave Observatory(SGO)-Mid
Minimum Cost 3-arm/6-link LISA-like MissionPresented by Jeff Livasfor the SGO Core Team
Slide2Concept DescriptionRationale for the configurationTry to find lowest cost 6 links for LISA-like missionBenefits of 6 links
Instantaneous/continuous polarization informationSagnac enables noise estimationRedundancy: tolerates loss of up to 2 links while still doing scienceSGO-Mid differs from LISA by:Arm length reduced from 5 to 1 GmMission length reduced from 5 to 2 years.Starting distance from Earth reduced by ~2.5X to a 9-degree trailing orbit.Telescope diameter reduced from 40 to 25 cmLaser power out of telescope reduced from 1.2 to 0.7 W (end of life).In-field guiding instead of articulating optical
assembly
Slide3SGO-Mid Science
Slide4SGO-Mid ScienceCovers decadal
-endorsed scienceGenerally detects fewer sources of all typesMain science risk is shortened mission durationEvent rates uncertainScience return lower if event rates are lower
Slide5Parameter Estimation
Slide6SGO-Mid Configuration
HighMidLow
Small telescope means optical bench sets heightIn-field guiding simplifies optical assembly
Launch stack fits easily into a Falcoln 9 fairingdrift away orbit requires little fuel, simplifying prop module
Slide7Scientific Payload
Slide8Orbits/trajectory2 year drift-away~ 6 deg/year drift rate starting at 9 degrees2 year end of mission similar to nominal SGO-high orbital stationCommunications requirements similar to SGO-highStable constellation
DL/L ~0.06Da ~ 0.6Dv ~ 2 m/s18 month trajectoryOptimized D
V ~ 130 m/s (each)
Slide9Cost EstimateCost model includesNon-recurring Engineering costs“learning curve” for multiple copies20% additional management reserves
Scaling with mission lifetimeScaling rates for NRE, learning curve based onSpacecraft/Vehicle-Level Cost ModelNASA/Air Force Cost ModelSGO High Estimate $1.66 BLaunch vehicle
savings-$0.03
Payload mass/redundancy reduction-$0.11
Mission duration reduction-$0.12
SGO Mid Total $1.40 B