Here is an update to the prioritized materials testing queue for UHV compatibility, which was last reported in elog:3

1. On-going test - can be terminated now: E1900220-v1: Optical Contamination Test results: SR3 ROC Actuator, Ceramic Heater Assy
2. On-going test - some value in continuing test: E1900232-v1: Optical Contamination Test results: Low-Reflection, Matte Black Aluminum Foil
3. Accu-Glass PEEK UHV Heat-Shrink Tubing (useful for in-chamber cabling)
4. Krytox LVP (not officially approved for LIGO, but permitted extremely small amounts on beam diverters & within New Focus picomotor 830X-UHV)
5. Torr Seal epoxy (proposed for ZnSe window seal for in-vacuum, non-pumped, wavefront sensor by Australians, possibly for A+?)
6. Castrol Braycote 601EF (used in a proposed vacuum rated heat switch motor assembly for Voyager)

Note that the following test has been terminated/completed "recently":

• E1900080-v1: Optical Contamination Test results: ESM-12B Large Mode Area Photonic Crystal Fiber, E1800210, NKT Photonics large mode area, Photonic Crystal Fiber (PCF) ESM-12B sourced from ThorLabs. This is a fiber under consideration for higher power, lower loss, green light injection for the OPO in the squeezer subsystem. The fiber is approved for this application.