| Status | Blockage seems to have disappeared yesterday. Still warming to room temperature. He gas in MB vacuum jacket. MB full of He gas, IVC has He transfer gas |
| 0845 | Fill LN2 cold trap bath |
| 0850 | MC(Cernox) = 288 K, IVC = 7.4 mbar |
| 0850 | Press Mains and Reset on pump electrical box. No lights came on. After that 3He pump starts up fine. |
| 0855 | Pump both LN2 trap contents to dump |
| 0905 | Remove LN2 traps from bath to let warm up |
| 0910 | Pump fridge contents to dump. Dump(G2) = 793.3 mbar |
| 0915 | Isolate IVC then attach scroll pump to MB vacuum jacket port, pump out line. Read pressure in vacuum jacket: 1.4 mbar. |
| 0920 | Begin pumping out vacuum jacket. |
| 0930 | MB vacuum jacket = 3.4 e-3mbar turbopumping, 0.12 mbar with pump valved out |
| 0950 | Trap 2 at room temperature, 14.7 mbar of contaminants. This is the one used to cryoclean yesterday. Pump out Trap 2 with 4He pump. |
| 0930 | MB vacuum jacket = 0.40 e-3mbar turbopumping, 40 e-3mbar with pump valved out |
| 1000 | Trap 1 at room temperature, 10.0 mbar of contaminants. Pump out Trap 1 with 4He pump. |
| 1030 | Return LN2 traps to bath |
| 1030 | MB vacuum jacket = 0.40 e-3mbar turbopumping, 34 e-3mbar with pump valved out |
| 1055 | MB vacuum jacket = 0.40 e-3mbar turbopumping, 30 e-3mbar with pump valved out. Stop pumping out jacket. |
| 1105 | Attach turbo pump line to IVC port, pump out lines. |
| note | Accidentally disconnected pumping hose from vacuum jacket with the turbo pump valve open. Pump made a weird noise and shut itself down - luckily it was not an obviously break-y noise. Power-cycled turbo pump and got it going again, seems to be fine. |
| 1110 | Check IVC pressure: 5.4 mbar. But earlier it was higher, which is higher than what was originally put in before the initial LN2 transfer. So in case there's extra junk in there I will pump it out and put new He exchange gas in. |
| 1115 | Add 5.4 mbar He exchange gas into IVC. |
| 1125 | Backfill 1K Pot with He gas in preparation for cooldown. |
| 1130 | Commence LN2 transfer. Open Condenser Line Speedivalve so that fridge contents are open to He Cold Trap in hopes that any contaminants will be cryopumped into the trap rather than freezing in the fridge lines. |
| 1145 | Top off LN2 cold trap. Commence cryocleaning mixture through Cold Trap 1. |
| 1205 | MC(Cernox) = 272 K and falling, Sorb > 250 K, IVC = 4.6 mbar |
| 1300 | LN2 dewar has run out, and I don't think we have enough LN2 to last till tomorrow's blowout. Plug up LN2 fill port on Main Bath, put ping pong ball on exhaust port, and refill LN2 dewar. |
| 1310 | MC(Cernox) = 205 K and falling slowly, Sorb > 250 K, IVC = 3.4 mbar |
| 1455 | MC(Cernox) = 186 K |
| 1456 | Start LN2 transfer once again. |
| 1540 | MC(Cernox) = 261 K and falling faster, Sorb > 250 K, IVC = 2.2 mbar |
| 1550 | Sorb thermometer starts to read < 250 K |
| 1600 | MC(Cernox) = 145 K, Sorb = 239 K |
| 1605 | Cease cryocleaning. Commence pumping mixture to dump. |
| 1630 | Cease pumping to dump, P1=6 ubar, G2=795 mbar. Isolate dump. Turn off He-3 pump. |
| 1635 | Open Cold Trap 1 to P2 gauge and pull trap out of LN2 bath. P2 begins at 30ubar and begins rising. |
| 1645 | MC(Cernox) = 109 K, Sorb = 162 K, IVC = 1.6 mbar |
| 1645 | Stop LN2 transfer. Level resistor = 1.300 kΩ, ending a little early but we'll blow out early tomorrow. |