| Status | Fridge warm after discovering a blockage last week. MB vacuum jacket pumped out at least partially. |
| 0745 | Pump IGH to dump then check pressure in LHe cold trap, condenser, still. Barely any increase on G1 from LHe trap and condenser, maybe 0.1 mbar. Small increase on P1 after opening still gate valve, 7 to 14 μbar |
| 0750 | Opening V3 so that the condenser volume is open to P1. Surges as high as 100 μbar, then settles to 50 μbar. Pump fridge contents to dump. |
| 0750 | IVC = 19 mbar. Pump this out and refill IVC with 4.6 mbar He. |
| 0800 | Dump (G2 = 791.6 mbar |
| 0805 | Perform simplified reverse throughput test: open V1, condenser speedivalve, and still gate valve. Then open V14 to let mix from dump into still. Throughput = 11 mbar/min on G1. |
| 0810 | Pump mix from fridge to dump |
| 0825 | The LN2 cold traps are warm. Check pressures. Trap 1 = 0.5 mbar. Trap 2 = 5 mbar. Pump out traps with 4He pump |
| 0835 | Fill LN2 cold trap bath |
| 0845 | Isolate IVC and attach pumping bellows to MB vacuum jacket port, check pressure: MB vacuum jacket = 86 μbar. Pump vacuum jacket some more with turbo pump. |
| 0850 | Start cryocleaning mixture through LN2 Trap 2 |
| 0930 | MB vacuum jacket = 40 μbar with pump valved out. Stop pumping on vacuum jacket. |
| 0955 | Stop cryocleaning, pump mix from Trap 2 to dump |
| 1015 | Remove Trap 2 from LN2 bath to let warm, monitor pressure on G1 |
| 1036 | Commence filling HPGe crystal dewar with LN2. |
| 1055 | LN2 Trap 2 is at room temperature. Pressure on G1 is 11.6 mbar and flat, pretty high. Open Trap 2 to P2: G1 falls to 5.5 mbar, P2 = 5.0 mbar |
| 1100 | Pump out trap contaminants with 4He pump. Then return trap to LN2 bath |
| 1115 | Perform forward throughput test through Trap 1 (using all mixture). P1 increases by 0.5 mbar/min. G1 falls by 0.1 mbar/min. |
| 1130 | Letting throughput test continue for the time being. Maybe it will blow away any bits of oil in the still impedance. |
| 1140 | End filling HPGe crystal dewar with LN2. |
| 1200 | Main Bath should still be filled with He gas after Pump & Flush post-LN2 blowout. Open V1A to confirm that there's still an overpressure. G3 reads ~30mbar overpressure. Open 1K Pot speedivalve to let He gas overpressurize it as well. Ready for LN2 transfer. |
| 1205 | Let mix sit in fridge: 3He pump off, V9 & V13a open letting mix through Trap 1, V12a/speedi & V1 & V3 and both fridge valves open to let mixture into both sides of fridge. |
| 1208 | Commence LN2 transfer. G1/G2(mixture) = 658/609 mbar. |
| 1240 | MC(Cernox) = 291 K, falling. IVC = 3.0 mbar. G1/G2 = 656.5/607.2 |
| 1300 | MC(Cernox) = 275 K, IVC = 2.5 mbar. G1/G2 = 655.4/606.5 |
| 1330 | MC(Cernox) = 234 K, IVC = 1.6 mbar. G1/G2 = 653.8/606.4 |
| 1410 | MC(Cernox) = 194 K, IVC = 1.4 mbar. G1/G2 = 652.0/605.8 |
| 1411 | Taking a few test data series to test DCRC external triggering. |
| 1415 | Close V13a and turn on 3He pump. Now dump is isolated from fridge, with some mixture still in fridge. |
| 1425 | Close V3, then open V6 to 14%. Now we're pumping the still side back to dump. G1 should start to fall faster if there is throughput, since we are pulling mix from condenser to still. |
| | Seems to have throughput: P1 falls quickly to < 1mbar, G2 (dump) rises to >750 mbar, and G1 is falling steadily and more quickly, about -4 mbar/min |
| 1440 | Close V6 and open V13a (leaving V3 closed). This will let the still fill up again slowly from the condenser side. Turn off 3He pump. P1 begins to rise, more confirmation of throughput. |
| 1445 | MC(Cernox) = 163 K, Sorb = 235 K, IVC = 1.2 mbar. G1/G2/P1 = 775/722/“1000” mbar |
| 1516 | Temporarily cease LN2 transfer (storage Dewar empty). Resistor read 1.12 kΩ. |
| 1530 | MC(Cernox) = 135 K, Sorb = 174 K, IVC = 1.0 mbar. G1/G2 = 749/670 mbar |
| 1620 | Recommence LN2 transfer. |
| 1700 | Temperature test resistor reads 1.321 kΩ. Cease LN2 transfer. Attach ping pong ball. |
| 1725 | Fill LN2 cold trap full. |
| 1815 | Mixing chamber still only at 93K. Going to leave He exchange gas in overnight. We can pump it out in the morning. |