James Webb Space Telescope Optical Simulation Testbed I: Overview and First Results
Marshall D. Perrin, R\'emi Soummer, \'Elodie Choquet, Mamadou N'Diaye,, Olivier Levecq, Charles-Phillipe Lajoie, Marie Ygouf, Lucie Leboulleux,, Sylvain Egron, Rachel Anderson, Chris Long, Erin Elliott, George Hartig,, Laurent Pueyo, Roeland van der Marel, Matt Mountain

TL;DR
The paper introduces the JWST Optical Simulation Testbed (JOST), a tabletop setup that mimics JWST's wavefront sensing and control, enabling testing, training, and development for the space telescope's mission.
Contribution
It presents a compact, flexible optical testbed that simulates JWST's physics and control systems, supporting commissioning, algorithm evaluation, and staff training.
Findings
Achieved 80% Strehl ratio at HeNe wavelength
Successfully modeled segmented mirror control in piston, tip, and tilt
Demonstrated potential for commissioning activities and algorithm testing
Abstract
The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop workbench to study aspects of wavefront sensing and control for a segmented space telescope, including both commissioning and maintenance activities. JOST is complementary to existing optomechanical testbeds for JWST (e.g. the Ball Aerospace Testbed Telescope, TBT) given its compact scale and flexibility, ease of use, and colocation at the JWST Science & Operations Center. We have developed an optical design that reproduces the physics of JWST's three-mirror anastigmat using three aspheric lenses; it provides similar image quality as JWST (80% Strehl ratio) over a field equivalent to a NIRCam module, but at HeNe wavelength. A segmented deformable mirror stands in for the segmented primary mirror and allows control of the 18 segments in piston, tip, and tilt, while the secondary can be controlled in…
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