PPT Slide
basic dust collection experiment in 4m and 1.5m tel. domes with horizontal microscope slides left exposed to ambient air for 21 months (June99-Apr01)
- Both indicate av. scatter increase of 1.11% (+/-0.02) per month.
Note: For comparison, Schmidt telescope M1 (tube closed with corrector): reflectivity and scatter worsen by 1% per year (average over 10 years)
- About 60 particles with 5 < size < 10 mm per mm2
- About 8 particles with size > 10 mm per mm2
- Purchase of a Metone particle counter. Will be used to detect ‘dust event’ and for GSMT site-testing in Atacama
- Replace the now-dusty summit soil cover with new gravel-type material (test Dimm at ground level was found covered with dust)