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so-90prime / 90prime

General repo for everything related to 90Prime (docs, diagrams, thoughts)
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Dewar Window Replacement #19

Closed dsand closed 3 years ago

dsand commented 4 years ago

Due to the scratch in the current dewar window, we have decided to replace it rather than refurbish it (see this closed issue).

This thread will be focused on the replacement process.

dsand commented 4 years ago

Initial quote was wrong. I'm putting in the new figures here.

Here is an updated figures. Confusion had happened in labor estimate. My optician had his labor for both surfaces in one bucket and I doubled that for two separate surfaces. Anyway, labor makes sense but still other elements in the note are quite high.

Option 1: Refurbish the existing window

Cost = $35,503 Schedule = 3 month Scope Fine grinding and polishing optical surface to the spec Test plates and materials included Coating (shipping and insurance included) Option 2: New fab from a blank

Cost = $62,712 Schedule = 5 month Scope Procure blank Generating Rough/fine Grinding and polishing optical surface to the spec Test plates and materials included Coating (shipping and insurance included) Option 3: New fab + refurbish (2 windows)

Cost = $89,764 Schedule = 8 month NOTE:

Blank = $9,158 Tooling, Test plate and materials = $12,000 Coating = $9,000

dsand commented 4 years ago

For reference, I'm inserting a screenshot of the optical design for L4, the dewar window, here. Screen Shot 2020-09-21 at 8 47 07 AM

dsand commented 4 years ago

Chang-Jin is now collecting quotes from multiple vendors. including TORC and AOS.

dsand commented 3 years ago

Have not been keeping up with this. But new dewar window is complete, with AR coatings, and delivered to M. Lesser. Closing.