Mirror prototype test plan
Testing of existing mirror box
After the mirror box removal, the following tests should be performed to study the damage to the mirrors
- Water/food dye leak check
- Initial spot check with dye for clear leak sources
- Submerge full mirror piece in water tank with dyed water to identify possible leak sources
- Relative reflectivity mirror measurement
- Compare reflectivity of know sample mirror and those from mirror box similar to [1]
- Further studies could be done in detector group's Big Blue Box, etc.
Proposed prototypes
Small samples ~(5x5cm) should be made for testing under water and reflectivity measurements. Below are the suggested fabrication steps to produce test pieces. For reproducibility we could make 3 of each sample.
1) Follow similar procedure as existing mirror box, but use wider strip to provide better water seal
- Borosilicate + UVE mirror with DP270 2 cm wide strip around edge
2) Setup small "bag" with blue film to sandwich protective glass against mirror surface using pump. Keith previously setup something like this in the Hall last year
- Borosilicate + UVE mirror sandwich with DP270 entirely between surfaces
- Borosilicate + UVE mirror with Epotek entirely between surfaces
3) Use bell jar from detector group to pump
- UVE mirror with Epotek poured on and cured over ~days under bell jar to investigate procedure
- Requires level surface for even curing of "flat" coating of Epotek
- Consider solutions for "dam" around mirror to keep fixed thickness of epoxy
4) Try screen protector suggested by Stephanie as
- UVE mirror with wipe-on screen protector
Test plan
After prototypes are produced (early December), make the following tests:
- measure reflectivity relative to control UVE mirror
- use laser to evaluate impact of any non-uniformity of epoxy layers (speckling)
- place one sample in water bath and one sample under UV lamp to test stability
- each week, take samples out of water/lamp setups and measure relative reflectivity
Goal: decide on full scale prototypes to produce by the end of 2020 for testing in December/January
