We describe testing and analysis conducted to demonstrate in-space thermoelastic shape stability of starshade structures. Thermoelastic deformation testing was conducted on key starshade structural components. These components were constructed at relevant scales and at relevant fidelity to flight-like structures. Results from thermoelastic deformation testing were used to calibrate high-fidelity finite element structural analysis techniques; these finite element tools were then used to predict the in-space thermoelastic distortions of a 26 m-diameter starshade. The in-space temperatures for these structures were predicted using a separate radiative-thermal finite element simulations, and were meant to envelope temperatures that a starshade would experience during periods of telescope shading. The predicted in-plane thermoelastic deformations of this 26 m-diameter starshade were found to be sufficient to fit into an overall error budget to enable instrument contrast better than 1e-10.
Manan Arya, Flora Mechentel, David Webb, John Steeves, Doug Lisman, Stuart Shaklan, Samuel Bradford, Eric Kelso, Kenzo Neff, Amanda Swain, Andrei Iskra, Neal Beidleman, John Stienmier, Gregg Freebury, Andrew Tomchek, Tayler Thomas, Craig Hazelton, Kassi Butler, Kamron Medina, Mike Pulford, Larry Adams, David Hepper, Dana Turse
Starshade concepts must be stowed within rocket fairings for launch and then deployed in space. The in-plane deployment accuracy must be on the order of hundreds of micrometers for sufficient starlight suppression to enable the detection and study of Earth-like exoplanets around nearby Sun-like stars. We describe tests conducted to demonstrate deployment repeatability of two key structural subsystems of the “furled” starshade architecture—the petal and the inner disk. Together, the petals and the inner disk create the in-plane shape of a starshade. Test articles to represent the petal and inner disk subsystems were constructed at relevant scales for a 26-m-diameter starshade. These test articles were subjected to stowage-and-deployment cycles and their shapes were measured. The measured performance—tens of parts per million of petal strain after deployment, and hundreds of micrometers of inner disk deployment accuracy—was found to be within required allocations.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.