IFO pressure 2 Torr, PSL shutter closed. I'm pumping down with 2 roughing pumps with ion pump gate valves open and annulosses at atm.
The vacuum envelope was vented to 17 Torr while I was replacing the USP battery stack. More about this later.....
Do not plan on using the interferrometer tonight. I will complete the pumpdown tomorrow morning.
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