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2012/03/18

0845 IVC pressure 4e-3mbar. There is a big leak somewhere. Need to find it out.
1253 Leak check - background rate is 2.3E-9 mbar l/s.
We sprayed helium everywhere and there was no leak detected. The pressure gauge is a suspect here. It's reading the same pressure as yesterday when we though there was a leak and after the leak tests and spraying helium the pressure reading didn't waver.
The IVC was isolated and the pressure did not decrease. It stayed at 4E-3 mbar.
We're going to go ahead and raise the dewar and do another leak check.
1514 Raised main bath. Pumping on main bath now.
1537 Filled main bath with He gas. Cleaning mixture. Background leak rate before sealing off leak checker from IVC was : 4.2E-9 mbar l /s
1557 Filled IVC line with 14 mbar of N2 exchange gas. When opening the valve into the IVC, pressure dropped to 1.6 mbar.
1610 Begin LN2 transfer.
1900 End LN2 transfer.