PPT Slide

4m chamber

• Fix leaks of the 4m chamber for higher vacuum and even better purity of coating BUT reflectivity excellent

• Modify filament configuration for better thickness uniformity (KPNO reached +/-10%) BUT 400Å is acceptable (~l/10)

1.5m chamber

• Last coating done under 4.10-5 T was about 2% below ideal: gas contamination due to poor vacuum? Do leak testing.

TO DO:

OBSERVATIONS:

• 45-90s aluminizing time doesn’t seem to show any difference in coating micro-roughness
• 6.10-6 Torrs is low but enough for high purity and reflectivity
• Substrate free of dust when chamber is sealed to avoid pinholes in coating

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