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2013/09/19

1130 Filled LN2 cold trap full.
1225 Mixture has been cryocleaning through cold trap 2 all night. Flow had stopped by morning so V6 was opened further and cyrocleaning was resumed for an hour. Mixture was then pumped to the dump with G2=550.5 mbar.
1331 Although it was expected that cold trap 2 (which is presumed to have a leak) would make the mixture dirty, G2=696.5 mbar after all mixture has been pumped to the dump (G1=0.02 mbar and P1=0.005 mbar), suggesting that there is not a leak around cold trap 2. Simply baffling.
1355 Begin cryocleaning mixture through cold trap 1.
1525 MC = 187.697K, Pressure in IVC = 1.6e-5 mbar
1540 Started Nitrogen transfer.
1636 Isolate IVC to prepare for infusion of Nitrogen exchange gas if we need it.
1730 Stopped Nitrogen transfer. Attached ping-pong ball.
1816 Added 1.0 mbar Nitrogen exchange gas. Temperature is currently at 186 K.
2200 Fill N2 cold trap full.