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Entry  Mon May 24 15:47:30 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling cooling.png
    Reply  Mon May 24 16:49:17 2021, rana, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling PPP.jpg
       Reply  Tue May 25 13:19:41 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling 
    Reply  Tue May 25 16:38:17 2021, Stephen, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling --> started warmup cooling_full_20210525.png
       Reply  Thu May 27 16:48:35 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling --> started warmup 7x
          Reply  Mon May 31 11:38:13 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling 14x
             Reply  Wed Jun 2 20:06:07 2021, rana, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling 
Message ID: 2579     Entry time: Thu May 27 16:48:35 2021     In reply to: 2577     Reply to this: 2580
Author: Radhika 
Type: DailyProgress 
Category: Cryo vacuum chamber 
Subject: Weekend cryo chamber cooling --> started warmup 

This morning I vented and opened up the chamber to add aluminum foil and other insulation. Stephen's order of mylar sheets, peet sheets, and G10 rings came in today and I picked it up from Downs.

⁃ unscrewed the bottom conflat of the tee and added foil where I could reach (junction of cold head and copper braid) [pic1]

- cut narrow rings of 0.01'' thickness peet sheet and inserted into the main hole of the inner/outer shields, to prevent shorting to the copper braid [pic 6, 2, 3]

- added foil to the inside of the outershield and outside of the inner shield, poking holes for all viewports [pics 4,5]

⁃ unclamped the copper braid from the coldplate and the RTDs from all locations (shields, heater, workpiece mount) to prepare for lining baseplate with foil [pic 7]

Tomorrow we plan to wrap the shaft of the copper braid with metallized mylar and an additional layer of foil. I left both shields outside of the chamber so that tomorrow we are ready to remove the cold plate and add foil below. 

 

Quote:
  • Cooldown complete as of 4:41, with part 2 of data posted to CSVlogs Box folder with file name "cooldown part 2 20210525.CSV" for Radhika's analysis.
  • Resumed USB logging and started Warmup. Simply turned off cryocooler using compressor panel's green power switch, then flipped circuit breaker lever to off position.
    • Expected to be ready for opening, with warmer-than-freezing temperatures throughout, on Thursday morning.
    • Noticed a "burp" of the gauge pressure readings up to e-2 torr range immediately upon turning off cryocooler, lasting about 1 minute before gauge readings were back down to e-6 range. Interesting, and something to keep an eye on.
  • Linked Active Ion Gauge (5e‐2 to 5e‐10 torr per AIG manual) to Active Pirani Gauge (atm to 7e‐3 torr per APG manual) so that the Edwards TIC controller will enable the high-vacuum AIG during pump down and disabled during venting. Prior, the AIG had to be manually enabled at suitable operating pressures. Followed instructions at Section 4.11 of the TIC controller manual. Recall that all manuals are hosted on the QIL Cryo Vacuum Chamber wiki.

Radhika, feel welcome to post full cooling data to this entry, or to your original - up to you!

 

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