Paper 13134-41
Paper 13134-41
Characterizing gravity sag at cryogenic temperatures
20 August 2024 • 10:10 AM - 10:30 AM PDT | Conv. Ctr. Room 16A
Abstract
Spaced-based mirrors that operate in cryogenic temperatures have a decreased gravity sag value than their phase maps at 293k. To characterize how the gravity sags changes at cryogenic temperatures a 1.2m aluminum mirror made of 5083 had a horizontal rotation test done for N=3 rotations (0°, 120°, 240°) for multiple temperatures ranging from 293k to 35K.
Presenter
Tomasz M. Lis
NASA Marshall Space Flight Ctr. (United States)
Dr. Tomasz Lis is a Ph.D. graduate from the University of Alabama in Huntsville (UAH). He began his optical experience as a Ph.D. research student at UAH in the optics department. Dr. Lis also was a NASA Pathways student at the Marshall Space Flight Center in Huntsville, Alabama and has worked on multiple flight projects from 2012 to 2020. His first flight project experience was working on the High Energy Replicated Optics to Explore the Sun (HEROES) balloon flight mission. During this mission Dr. Lis was tasked with designing an alignment monitoring system for the X-ray telescope during the flight which was the dissertation topic for his Ph.D. work. Currently, Dr. Lis is an Optical Physicist at NASA Marshall Space Flight Center. He is working on characterizing the effects of gravity sag on large flight optics along with determining cryogenic performance of optics.