LDRD Update Summary - December 2020

Evolving plans for coating materials, designing permeation test stand, vacuum chamber and gas sensor types, slow progress with expectations to pick up after the holidays.

• Update
• Coating
• Materials
• Vacuum Chamber
• Gas Sensor

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1. LDRD update Brendan Casey, July 27, 2020

2. Evolving plans We haven t been able to get a vendor to coat in the quantity we want Haven't done an exhaustive search either Recal that minimum quantity order from last vendor was about 60k worth of material (10k for Al, 50k for Al+Au) Don t want to commit to that purchase when we still have questions about the coating to investigate We are proceeding with designing and constructing a permeation test stand to try and understand what the minimum thickness of coating we can get away with and also study gap/overlap/butt seams. We started this but the engineer got so we are basically starting again This would use ~2in square samples so there are lots of vendors who can do this coating. Dec. 8, 2020 LDRD update 2

3. Vacuum chamber type Evacuated and then back filled with a known gas. Back fill to ATM Boundary is something like a grid of small holes that are small enough to hold the pressure differential but has enough holes so the measurement doesn t take forever Evacuated and then closed to do rate of rise measurement Dec. 8, 2020 3 LDRD update

4. Gas sensor type Filled with gas mixture A + B Boundary is something like a grid of small holes that are small enough to hold the pressure differential but has enough holes so the measurement doesn t take forever Filled with gas A and has a sensor that can measure the concentration of gas B Still would like some pressure differential so that the measurement doesn t take forever Dec. 8, 2020 LDRD update 4

5. Conclusions Not a lot of progress but expect this to pick up after the holidays Dec. 8, 2020 LDRD update 5