A Preliminary Trade Study of Hybrid Lyot Coronagraphs for LUVOIR

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Presentation transcript:

A Preliminary Trade Study of Hybrid Lyot Coronagraphs for LUVOIR Carl Coker, NASA Postdoctoral Program Fellow, NASA JPL Collaborators: AJ Riggs, Gareth Ruane, Stuart Shaklan September 17, 2018 © 2018. California Institute of Technology. Government sponsorship acknowledged.

Large UV/Optical/Infrared Surveyor (LUVOIR) LUVOIR A 15 meters, on-axis LUVOIR B 8 meters, off-axis General astrophysics observatory with dedicated exoplanet instrumentation Telescope Pupil DM1 DM2 Focal Plane Mask Lyot Stop Image Plane

Hybrid Lyot Coronagraphs No pupil-plane apodization Two-layer partially transmissive focal plane mask Thin (<100 nm) uniform nickel layer Variable-thickness dielectric (PMGI) layer Controls focal plane phase Allow inner working angles below 3λ/D on obstructed aperture telescopes

Inter-DM Fresnel Number

Number of DM Actuators

Performance Vs. Inner Working Angle

Optimal Starting PMGI Thickness

Optimal Lyot Stop Size

Future Work Improving tip/tilt sensitivity Reducing likelihood of controller missteps Limited true multi-dimensional surveys Many parameters likely to be interdependent