[Aidan]

I've attached a timeline of our inspection this afternoon along with today's pumping timeline,

Here is a brief summary of observations from previous pumping timelines. Today's pump down is consistent with previously observed timelines.

• https://nodus.ligo.caltech.edu:8081/QIL/2674. Turbo comes on after 15 minutes. Roughing pump gets to 30 Torr at this time
• https://nodus.ligo.caltech.edu:8081/QIL/2654
  • t = 0m: pump ON
  • t = 15m: Turbo ON (~30 Torr) [Turbo automatically on at 15m]. Reading at approximately 15-16m
  • t = 23m: 1mTorr
  • t = 33m: 0.3-0.5mTorr
• https://nodus.ligo.caltech.edu:8081/QIL/2288
  • t = 6 hours, 8.2E-6 Torr

2:17PM – Assessing the impact of the 408K event in the MegaStat

Coldhead reached 363K (90C)

Innershield reached 403K (130C)

2:24PM – Aquadag E service temperature (149C)

https://www.laddresearch.com/index.php/lanotattachments/download/file/id/40/store/1/

Maximum service temperature in air* : 300°F (149°C) 

*Service temperature under vacuum conditions is significantly higher. Contact Acheson for specifics. 

2:25PM – Bringing Megastat back up to air for initial inspection

2:37PM – chamber is at air

2:41PM – removing bolts

3:13PM – initial inspection looks normal. No elevated amount of black particulates found on surfaces – consistent with or less than the amount seen last time we opened.

Stephen detected faint smell different from last time (“campfire”?)

• One RTD connector did delaminate Aquadag from the inner shield

3:14PM - Stephen reattaching the RTD wiring that had delaminated. I wiped up visible particulates with isoproponal soaked wipe.

3:21PM – putting lid back on

3:30PM – lid on. Screws in finger tight

3:35PM – screws tight – ready to pump

3:40PM – pumping station on