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2011/09/26

1122 Found MC X12004 started to drop from 7.1K at 23:45 last night and reached and stayed at 4.3K from 01:06 this morning. IVC pressure 4.6e-6mbar. There might still be a small leak. I'll start condensing mixture and see.
1135 Filled N2 cold trap.
1141 Start 1K pot, start condensing mixture. 1K pot temperature 1.622K.
1256 1K pot 1.818K. G1 and G2 kept rising. There might be a blockage in the circulation line. Pump mixture out from the still line. G1 dropped. The circulation line is still open.
1300 MC temperature rises while pumping the mixture. G1 and G2 also rise. P1 stays at 0.55mbar.
1312 Pump IVC, IVC pressure 5.4e-5mbar.
1315 G1 is dropping. There seems too much Helium left in the IVC and it thermally shorts the fridge below 2.2K.
1341 IVC pressure rose to 5.4e-6mbar from 3e-6mbar. MC X12004 rose from 3.19K.
1342 MC X12004 3.45K. IVC P = 7.4E-6 mbar.
1343 IVC P = 8.6e-6 mbar.
1351 MC temperature and IVC pressure both went down.
1526 IVC pressure 4.6e-6mbar. MC X12004 3.49K. 1K pot 1.708K.
1733 IVC temperature fluctuates with temperature. There must be fairly amount of He in the IVC from a leak. Now stop 1K pot and pump out mixture.
1738 Stopped 1K pot, added 2mW to MC, pumping mixture into dump.