| 0842 | Fill LN2 cold trap full. Currently, mixing chamber temperature at 485 mK, P1=.24 mbar, G1=185 mbar, G2=189 mbar. |
| 1120 | Mixing chamber temperature stable at ~480mK, G1&G2 stable at 194mbar and 199mbar respectively, P1: 240ubar. G1/G2 have steadily risen to this point from ~180mbar at 4AM. This implies a rate of increase of ~2.9mbar/hour. 1K Pot at 1.67K. Lower 1K pot temperature in hopes of lowering pressures. |
| 1140 | 1K Pot temperature has fallen to 1.55K, and pressures have fallen to: G1: 158mbar, G2: 165mbar, P1: 200ubar. The mixing chamber temperature, however, has begun rising. It is currently ~580mK and still rising slowly. |
| 1145 | Mixing chamber temperature peaks at 583mK, and begins dropping slowly. |
| 1230 | 1K Pot oscillating ~3.5K. G1/G2 at pressures of ~600mbar and rising. P1: 0.9mbar and rising. Mixing chamber temperature dropped to 338mK and still dropping. Suspect 1K pot may have run dry. Open 1K Pot needle valve and 1K pot temperature drops to 1.8K. P1 drops to 0.6mbar, and pressures of G1/G2 begin dropping. |
| 1255 | G1: 471mbar, G2: 454mbar, P1: 0.4mbar. Mixing chamber temperature at 356mK and rising. |
| 1305 | Mixing chamber temperature at 471mK and dropping. 1K Pot temperature oscillating around 1.8K with a magnitude of ~0.4K. |
| 1316 | Mixing chamber temperature at 343mK and rising. G1: 554mbar, G2: 553mbar. |
| 1322 | Close V6 to 50%, P1: 0.9mbar. No change seen. |
| 1327 | Close V6 to 30%, currently mixing chamber temperature at 467mK and rising. G1: 732mbar, G2: 642mbar, P1: 1.6mbar, P2: 6mbar. |
| | P1 rises to 1bar, so open V6 to 40%, and P1 drops. |
| 1350 | Open V6 to 100% and prepare to pull out small percent of mixture (mostly He3). |
| 1358 | Open V9 temporarily to pull out 118mbar of mixture from circulation. If all He3, that leaves ~30mbar of He3 (5.6% of mix). 1K pot temperature 1.68, P1: 0.32mbar, G1: 162mbar, G2: 167mbar. |
| | 1K pot starts dropping, mixing chamber temperature rapidly drops to 663mK before rising rapidly. |
| 1408 | Pull out more mixture for a total of 142mbar removed from circulation. Should be ~508mbar of mixture left in fridge. Mixing chamber temperature still rising, and begins oscillating. |
| 1420 | Mixing chamber temperature still oscillating. Cease circulation, cease pumping on 1K Pot, and commence pump to dump. Turn on mixing chamber heater to 10mW. |
| 1645 | With G2=677 mbar and P1 steady at 16 ubar, close V6 and gate and condenser line valves. |
| 1700 | With all valves on IGH closed, remove He cold trap from bath and allow to warm while monitoring pressure on P2. G1: 3.7mbar, P2: 8mbar. It appears that there was something inside the trap. Commence cleaning He cold trap. |
| 1715 | Finish first round of He cold trap cleaning. Turn off mixing chamber heater. |
| 1735 | Finish second round of He cold trap cleaning. |
| 1750 | Finish pumping on LHe transfer. Close V1 and V2 and put cold trap back in bath. Pull LN2 cold trap 1 from bath and allow to warm up while monitoring pressure on P2. |
| 1800 | Commence LHe transfer (2.8%) |
| 1815 | Collect 11 mbar in P2. Open speedivalve to evacuate nitrogen cold trap 1. |
| 1827 | Finish first round of nitrogen cold trap cleaning. |
| 1850 | Cease helium transfer. Helium liquid level 94.4%. |
| 1910 | Finish second round of nitrogen cold trap cleaning. |
| 2130 | Cease evacuating nitrogen cold trap 1. Place cold trap back in bath. Fill N2 cold trap full. |
| | Open valve V13A on IGH to allow mixture into nitrogen cold trap 1 to cool it before commencing condensation procedure. |
| 2200 | Start 1 K pot, temperature 1.78 K. |
| | Commence manual condensation procedure through nitrogen cold trap 1 without opening valve V3 on IGH (ie. fill mixing chamber from condenser side only). Mixing chamber temperature 16.1 K. |
| 2240 | Valve V12A fully open: manual condensation procedure complete. Mixing chamber temperature 2.2 K. Pressures in G1 & G2 are around 100 mbar. |
| 2255 | Mixing chamber temperature has risen slightly, although it is still around 2.2 K. That is a bit strange; perhaps mixture is still condensing. Additionally, mixing chamber temperature dropped from 16.1 K to around 2.4 K very quickly; it took around 25 minutes. This appears too quick. I don't believe we saw this in the old laboratory, although we have seen similarly rapid drops in temperature during this run. Something to cogitate on. |
| | Pressures in G1 & G2 are 86 mbar & 76 mbar respectively. Good enough. Close valve V9 on IGH to isolate dump and commence manual circulation procedure. |
| 2315 | Fully open valve V6: manual circulation procedure complete. Mixing chamber reaches temperature of around 750 mK before rising to 860 mK. Mixing chamber temperature currently falling. |