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2013/11/26

1030 With Pressure in line to dewar at 1E-6 mbar, open flange to dewar and commence pumping on dewar once again.
1300 With G1=0.7 mbar, P1=0.017 mbar and G2= 675.2 mbar, isolate dump.
1315 Fill LN2 cold trap full.
1325 After mixture in dump cooled due to filling cold trap, with V9 open G2=673.5 mbar. Commence cryocleaning through cold trap 2.
1815 Cease cryocleaning and commence pumping mixture to the dump.
1830 Filled LN2 cold trap full.
1835 With G1=0.3 mbar, P1= 0.013 mbar and G2=673.1 mbar all mixture has been pumped back to dump. It appears that no mixture has gone missing nor has any extra mixture (dirt etc.) appeared from cryocleaning through cold trap 2. This process will be repeated overnight to make sure.
1900 From the G2 pressure 673 mbar above, begin cryocleaning mixture through cold trap 2.
Dewar jacket pressure at 3.4E-4 mbar. Leave to continue pumping out overnight.