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2011/07/01

0005 Nitrogen level meter resistance 1.35 kΩ. Stop LN2 transfer. Mixing chamber temperature 211 K, and falling.
0020 Fill N2 cold trap full.
1000 Pump out N2 exchange gas.
1219 Electrical checks are OK at 82K. Throughput test: 43mbar/min. No leak from circulation line.
1330 Start blowing out nitrogen.
1345 Rubber hose split, resulting in liquid nitrogen being sprayed everywhere. Interrupt blowing out to cut tube.
1355 Recommence blowing out.
1500 Finished blowing out LN2. Filled LN2 cold trap. Pumped transfer stick.
Helium leak level 2E-7 mbar l/s: no change from background, so looks like there is no significant cryoleak.
1630 Slight setback by pulling out LN2 transfer stick without over-pressurizing line with helium. Corrected that.
1718 Begun LHe transfer.
1821 Start pumping He-4 exchange gas
1841 Ended LHe transfer (87.2%).
1919 Keep pumping IVC. Start 1K pot, start condensing mixture. Mixing chamber temperature: 4.25K. IVC pressure: 2.2e-6mbar.
2111 Close IVC. Start circulation. Tower temperature:2.1K.
2211 Bake detector overnight. Tower temperature: 545mK.