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Entry  Tue Nov 12 17:44:39 2019, Raymond, DailyProgress, Cryo vacuum chamber, Tank Update IMG_0258.JPGIMG_0257.JPGIMG_0259.JPG
    Reply  Thu Nov 21 21:58:27 2019, Raymond, DailyProgress, Cryo vacuum chamber, Tank Update IMG_0490.JPGIMG_0491.JPGDiaphragmAdapt.pdf
Message ID: 2444     Entry time: Tue Nov 12 17:44:39 2019     Reply to this: 2455
Author: Raymond 
Type: DailyProgress 
Category: Cryo vacuum chamber 
Subject: Tank Update 

Last week I moved the upper portion of the crane to the new, bolted crane support stand. Chub removed the wheeled lower section from the lab shortly thereafter. I also re-threaded the nylon lifting strap to remove slack and level the lid a bit better during lifting and moved one of the side tables next to the crane so the lid can be safely lowered after being lifted off the tank (see first photo). 

Opened the tank today to check internal dimensions. It is now closed (top bolts finger tight) but not under vacuum. The diaphragm pump was dispatched today, so will replace the dirty pump and pull vacuum again upon arrival. 

Attached a photo of the baseplate for future drill pattern reference. Note there are three anomalous holes, this is where the PEEK support poles should go. It was discovered today that these holes are 1/4-20 tapped but the PEEK pillars are dirlled/threaded for a smaller bolt.

I've attached a rough cartoon of the cold plate height relative to the optical ports and the tank wall. The outer rad shield is not shown and is slightly misaligned, but it can be easily aligned with a ~1.5 mm shim (better for thermal isolation anyways). 

Attachment 1: IMG_0258.JPG  2.105 MB  | Hide | Hide all
Attachment 2: IMG_0257.JPG  1.887 MB  | Hide | Hide all
Attachment 3: IMG_0259.JPG  1.703 MB  | Hide | Hide all
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