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2013/11/27

1040 Cryocleaning still has flow.
Dewar jacket has been pumped down to 4.0E-5 mbar.
1140 Filled LN2 coldtrap full.
1424 With G1=0.2 mbar, P1=0.012 mbar and G2=673.8, we see yet again that cold trap two does not appear to let in any dirt (or at least no more than it removes). Any tests will be continued after cleaning the cold traps. Commence isolating dump for cold trap cleaning.
1450 Isolate dump (close manual dump valves). and close all valves on IVC. Remove nitrogen cold traps from dewar and begin pumping on all cold traps.
1630 Finished 1st round of cleaning for He and Ln2 cold traps.
1708 Finished 2nd round of cleaning for He and Ln2 cold traps.
1815 Finished 3rd round of cleaning cold traps. Currently G2=674.5 mbar, which is higher than before (most likely due to change in temperatures due to heat gun use). This indicates that no significant leakage is occurring near G2. Thus it seems fine to leave cold traps pumping out over long weekend.
Dewar jacket currently at 2.5E-5 mbar. It will be left to continue pumping over the long weekend.