PPT Slide
REGULAR IN-SITU WASHING (since March 00)
OPEN TUBES (4m, 1.5m tel.): M1 washed in-situ with inflatable seals on inner/outer diameters and water exhaust tube. Telescope at ZD 80°
CLOSED TUBE (0.9m tel.): M1 cell removed from telescope (but mirror stays in cell). No collimation required.
How long does it take? 4m: 3h ; 1.5m: 1.5h ; 0.9m: 4h !
No need for dedicated engineering: day-time activity
think safety: operator and mirror!
- Use garden hoses for all rinsing. Plenty of working light.
- Filtered water rinse (5)
- Warm soapy water highly concentrated rinse. (5)
- Soap + natural sponge contact. (10)
- Filtered water rinse. (5)
- Bi-distilled water rinse. (5+)
- Dry with nitrogen gas guns (5+)
- NO alcohol used (bad experience)