HiRA Wiki

CsI Water Damage Repair:

1. Remove CsI crystals (56 out of 56) (11/15)
   • Dismantle telescopes
   • Store E, dE detectors
   • Unwrap CsI bundles
2. Remove as much filter paper as possible from CsI (using ethanol and plastic scraper) (56 out of 56) (11/20)
3. Document damage (depth on front surface) (56 out of 56)
4. Detach photodiodes from each crystal (leave light guides on for now) (56 out of 56) (12/19)
5. Remove remaining filter paper and light guide paint (56 out of 56) (12/19)
6. MAchine crystals at WashU (56 out of 56) (1/18)
   • Driven down/back
7. Sand sides of each crystal (56 out of 56) (3/14)
8. Design and assemble lapping setup (4/14)
   • Setup machined with some problems
     • Lapping machine doesn't fit (FIXED)
     • Fast sliders wobbly
   • Sandpaper (delivered) (11/18)
   • Order stoppers (04/25)
     • Spacer (04/28)
9. Clean photodiodes, reattach to light guides
10. Reglue uncoupled light guides
    1. more RTV615 needed
11. Practice lapping with worst crystals (4/21)
    1. First practice with plastic crystal (04/29)
12. Lap crystals until surface clean (4/28)
13. Polish, rewrap, assemble bundles (5/14)
14. Test individual crystals in dark box (check leakage current)
15. Reassemble telescopes (??)