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2013/06/24

0040 Fill N2 cold trap full.
1025 Began pumping out exchange gas. Temp at 19.2K.
1030 Filled N2 cold trap.
1243 Began pumping mixture to dump.
1448 Close V6. G1 reads 0.5mbar and G2 reads 697.2mbar.
1439 Close all valves on IGH and check that gate valve and condenser line speedivalve are closed. Open valves, 11B 7, 2A, and 5A to open cold trap 2 to He4 pump. Remove cold trap 2 from LN2 bath. Now G2 is fluctuating around 695.5mbar but doesn't seem to be decreasing. Hopefully there isn't a leak in the IGH.
1540 Finished first round of cold trap 2 cleaning.
1627 Finished second round of cold trap 2 cleaning.
1710 Finished final round of cold trap 2 cleaning.
1742 Returned cold trap 2 to LN2 bath and filled bath full.G2 at 701.2mbar.
1749 Begin cryocleaning mixture. Initially G1 at 541.1mbar and G2 at 503.4mbar.
1859 Pump mixture to dump.
1919 Started the 1K pot. Started manual condensation.
2150 Dump pressure at commencement of condensation procedure 700 mbar. Current dump pressure 347 mbar. Therefore, 353 mbar of mixture in mixing chamber lines. Isolate dump by closing valve V9 on IGH. Open valve V13A on IGH: pressure in G1 looks fine (ie. <200 mbar). Leave valve V13A on IGH open and monitor situation.
2300 Open valve V12A on IGH to 100%, cease manual condensation procedure.
2325 Fill N2 cold trap full.