The Optical Contamination Facility (formerly the OTF, Optical Test Facility) consists of 3 vacuum chambers with high-finesse, resonant optical cavities used to test the effect of outgassing from materials/assemblies on optical properties (absorption, scatter @1064nm) over time.
basic description: P990032
original block diagram: D1001800
new block diagram: D1800215
compendium of all materials/assemblies tested to date (includes RGA results as well): E1000193
Current facility status:
Here is an update to the prioritized materials testing queue for UHV compatibility, which was last reported in elog:1
Note that the following test has been terminated/completed:
Here is an update to the prioritized materials testing queue for UHV compatibility, which was last reported in elog:3
Note that the following test has been terminated/completed "recently":
The original thermoelastic response of the mirror was documented in T970212, using the IDEAS finite element code. The analysis was redone using ANSYS and an analytical (series expansion); These two approaches agree with each other fairly well. The new results are similar to the original steady-state calculations in the original T970212-x0. The new results are uploaded to T970212-v1. While the characteristic time for the thermal response of the mirror (assuming only radiative coupling, no conduction) is ~190 sec (~3 minutes), the thermal response and thermoelastic deflection are at 90% of the steady-state value in ~30 seconds.