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2015/03/02

0905 Fill LN2 cold trap full.
1215 Start 1K Pot and start condensing procedure. Since 650 mbar worth of mixture in dump, prepare to close V9 when G2=400 mbar, allowing 250 mbar worth of mixture into the system. Current mixing chamber temperature at 18 K.
1320 Close V9 with 400 mbar mixture in dump (250 mbar in fridge lines.) Currently, mixing chamber temperature at 2.5 K.
1325 V12 opened all the way. Lower 1K Pot temperature.
1330 Commence circulation procedure.
1355 V6 open completely and mixing chamber temperature dropping. In an attempt to eliminate variables that have changed since moving labs, disconnect He recovery system from main bath, and allow to vent from bung hole at top of main bath.
1505 Reconnect He recovery system to main bath and commence recovering He.
1549 Switch to measuring the Still thermometer to see if oscillations are present on all thermometers.
1612 Oscillations are seen on still thermometer. Stop 1K Pot and pump mixture to dump.
1715 G2 at 649.9mbar, begin closing V6 in preparation for another condensation. Close all valves on IGH. 1K Pot temperature at 3.149.K Mixing Chamber Temperature at 8.5K. Start pumping on 1K pot.
1750 V12A fully opened.
1800 Open V14 to pump out the rest of mixture from the dump.
1900 Mixing chamber temperature reaches a minimum of 554 K and is now rising (possibly oscillating). P2=0.55 mbar.
1910 Mixing chamber temperature reaches 481 mbar and is still decreasing. P1=450 ubar. Fill LN2 cold trap full.
2240 Mixing chamber temperature has been stable at 483 mK for last few hours. Close valve V14 on IGH to stop extracting mixture from dump; P1 pressure 260 μbar. Leave overnight.
2245 Fill N2 cold trap full.