Date of Award
Doctor of Philosophy (PhD)
Physics and Astronomy
Don A. Gregory
David M Broadway
X-ray optics., Optical coatings., Coating processes., Magnetron sputtering.
The design and development of an in-house X-ray optic multilayer coating deposition system and coating test facility has provided a substantial contribution to research and development of reflective X-ray optic coatings at NASA Marshall Space Flight Center (MSFC). An extensive validation study of the system's capabilities to deposit repeatable, multilayer reflective X-ray optic coatings of various complexities is discussed and the deposition of initial broadband multilayer coatings are presented. Additionally, a coating stress study has been conducted where intrinsic coating stress was measured and characterized for both periodic and depth-graded multilayer coatings. Several stress reduction techniques, post-deposition annealing and stress compensation, were investigated for their feasibility in reducing coating-induced substrate deflection. Upcoming astronomical X-ray missions will benefit from these studies because future telescope technologies will require minimally stressed reflective coatings as the optics themselves become more lightweight.
Gurgew, Danielle Nicole, "Development of low stress, broadband X-ray optic multilayer coatings" (2019). Dissertations. 197.