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Entry  Mon Oct 18 10:02:17 2021, Koji, Update, VAC, Vent Started / Completed Screen_Shot_2021-10-18_at_14.52.34.pngScreenshot_2021-10-18_15-08-59.png
    Reply  Tue Oct 19 10:59:09 2021, Koji, Update, VAC, Vent Started / Completed 
       Reply  Tue Oct 19 11:30:39 2021, Koji, Update, VAC, How to vent TP1 Screen_Shot_2021-10-18_at_14.52.34.png
          Reply  Wed Oct 20 15:58:27 2021, Koji, Update, VAC, How to vent TP1 
Message ID: 16413     Entry time: Tue Oct 19 11:30:39 2021     In reply to: 16412     Reply to this: 16418
Author: Koji 
Type: Update 
Category: VAC 
Subject: How to vent TP1 

I learned that TP1 was vented through the RGA room in the past. This can be done by opening VM2 and a manual valve ("needle valve")
I checked the setup and realized that this will vent RGA. But it is OK as long as we turns of the RGA during vent and bake it once TP1 is back.

Additional note:

- It'd be nice to take a scan for the current background level before the work.
- Turn RGA EM and filament off, let it cool down overnight. 
- Vent with clean N2 or clean air. (Normal operating temp ~80C is to minimize accumulation of H-C contaminations.)
- There is a manual switch and indicators on the top of the RGA amp. It has auto protection to turn filament off if the pressure increase over ~1e-5.

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