Material Qualification RGA Test Results: Low-Reflection, Matte Black Aluminum Foil

Document #:

LIGO-E2000124-v1

Document type:

E - Engineering documents

Abstract:

Residual Gas Assay (RGA) of a sample of Matte Black Coated Aluminum Foil (All Foils; ThorLabs BKF12) - 50 ft x 1 ft roll.

The water outgassing rate of this sample (after 120C baking) is ~2e-12 Torr-L/s/cm^2 (comparable to aluminum after 1000 hr of pumping).

The apparent hydrocarbon outgassing rate of this sample is ~3e-10 torr-L/s (depends on interpretation of AMU 43, which is not well resolved). This just meets the single bake-load limit of 4e-10 tL/s (per section 6.c of E080177-v1).

The possible, proximate use-cases for this material are:
1) As a shroud(s) around the Transmission Monitor & Telescope Assembly, which requires a minimum of ~30 sq. ft. (single-sided), or 60% of this load.
2) As a shroud around the barrel of the test mass optic and suspension structure.

For more details about the RGA testing see:
https://ics.ligo-la.caltech.edu/JIRA/browse/Bake-9565

See also the results of the optical contamination cavity tests in E1900232.

Files in Document:

• E2000124-v1 ICS9565+black+coated+foil.pdf (673.7 kB)

Other Files:

• A-3-S.pdf (39.1 kB)

Topics:

• System Engineering
• Vacuum

Authors:

• Dennis Coyne

Related Documents:

• LIGO-E1000193: LIGO UHV Qualification Test Results

Referenced by: