• 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!