A Contamination-Free Ultrahigh Precision Formation Flying Method ...

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Laser TetherExample of <strong>Formation</strong> <strong>Flying</strong> at L2LaserTetherAltitude: 1.5 x 10 6 kmSatellite Mass: 100 kg1 kmCross-sectional Area perSpacecraft: 1m 2Base Line Distance: 1 kmTether Material: KevlarTether Diameter: 4 mm(99.9 % survival at L2for 5 years)Not to Scale
Laser TetherExemplary System Design• Major Perturbation ForcesSolar Pressure Force Per Pair: < 20 µNOther Perturbations Including Gravitational Perturbations Per Pair: < 30 µNTotal Differential Force Per Pair : < 50 µN• The Tethers are extended with ~ 100 µN with Photon Thrust Per Pair-- 0.16 µm Extension• The Change in Tether Length due to the Perturbation:Countered with Length Adjustment with Piezo-Translator (sub nm Accuracy)• Laser Requirements with Off-the-Shelf Components:Power Requirement ~ 1 W with 0.99995 MirrorsWith 20 % Wall-Plug Efficiency: The Total Laser System Power ~ 5 WStability Requirement: ~10 -3 (Lab Laser Stability ~ 10 -5 )Mirror Diameter: > 7 cm
Page 1 and 2: Laser TetherA Contamination-Free Ul
Page 3 and 4: Laser TetherPrior Propellant-Free F
Page 5 and 6: Laser TetherAdvantages of the Propo
Page 7 and 8: Laser TetherNano-Precision Formatio
Page 9 and 10: Laser Tether10000Intracavity Photon
Page 11 and 12: Laser TetherPhoton Thruster System:
Page 13 and 14: Laser TetherHeterodyne Interferomet
Page 15: Laser TetherMethod of Tether Vibrat
Page 19 and 20: Laser TetherOne-Year Later …“Km
Page 21 and 22: Laser TetherTechnology Readiness As
Page 23 and 24: Laser TetherPhase II Proposed Work
Page 25 and 26: Laser TetherConclusions• The prop

A Contamination-Free Ultrahigh Precision Formation Flying Method ...

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