| | MC & Sorb temperatures slowly decreased overnight. | |
| 0817 | MC(Cernox) = 11.3 K, Tower = 12.6 K, Cold plate = 18.1 K, Still = 9.3 K, 1K Pot > 7 K, Sorb = 13.7 K. Main bath = 56.8%. | |
| 0823 | IVC pumping overnight. Pumping pressure = 1.6e-6 mbar, IVC pressure = 1.0e-5 mbar | |
| 0825 | Room temperature LN traps pumping out overnight, P2 = 0.013 mbar | |
| 0830 | Put LN traps back in Dewar and fill Dewar | |
| 0835 | v9 open, G2 = 795.4 mbar, barometric pressure = 30.16 inHg, corrected dump pressure = 795.4+33.86*(30.19-29.92) = 804.5 mbar | |
| 0840 | Pump GHS volumes to dump through v5, v1, v3. Then close these and pump through v6 to dump. | |
| 0855 | P1 = 0.007 mbar, G1 = 1.0 mbar. G2 = 796.0 mbar, barometric pressure = 30.16 inHg, corrected dump pressure = 805.1 mbar | |
| 0858 | Open V13a to let mix into dump, allow to cool | |
| 0917 | Open condenser valve, v1, and cold trap 1 speedivalve to let mix into fridge. | |
| | When mix was let in, MC warmed slightly and Sorb and 1K Pot cooled significantly. | |
| 0929 | MC(Cernox) = 10.9 K, Tower = 12.1 K, Cold plate = 17.3 K, Still = 7.5 K, 1K Pot = 6.6 K, Sorb = 7.7 K. | |
| 0951 | G1 & G2 equalized at 620 mbar | |
| 0957 | MC(Cernox) = 10.7 K, Tower = 11.9 K, Cold plate = 16.4 K, Still = 6.4 K, 1K Pot = 5.9 K (flat), Sorb = 7.0 K (flat). | |
| 1000 | Perform electrical checks at breakout box. | |
| 1018 | Before starting 1K Pot, close V13a (keeping most mix in dump) | |
| 1022 | Open 1K Pot needle valve 60 degrees. Quick drop of 1K Pot temperature to 4.4 K, Sorb to 5.3 K | |
| 1027 | Open 1K Pot speedivalve | |
| 1039 | 1K Pot = 1.69 K / 17 mbar. G1 = 150 mbar. (G2 = 614 mbar, left in dump.) MC(Cernox) = 7.8 K, Tower = 8.4 K, Cold Plate = 3.3 K, Still = 2.1 K , Sorb = 4.0 K flatline (I guess this is minimum). | |
| 1044 | Open V13a to let mix from dump into fridge (12a still closed, but trap1 speedivalve open - trickling mix in) | |
| 1101 | Mix entering and condensing, G1/G2 = 83/512 mbar, both falling. MC(H35) = 2.25 K, Tower = 2.26 K, Cold plate = 2.77 K, Still = 1.62 K. | |
| 1101 | 1K Pot = 1.63 K / 8.5 mbar - lowish. Open needle valve additional 10 degrees. | |
| 1107 | 1K Pot = 1.79 K / 55 mbar | |
| 1108 | Open V12a to 0.3% to let mix in more quickly | |
| 1131 | G1/G2 = 75/280 mbar and falling. MC(H35) = 1.92 K, Tower = 1.93 K, Cold plate = 2.30 K, Still = 1.84 K, 1K Pot = 1.79 K / 50 mbar. | |
| 1137 | Open V12a to 5% to let mix in more quickly | |
| 1244 | G1/G2 = 50/50 mbar. MC(H35) = 1.85 K, Tower = 1.86 K, Cold plate = 2.21 K, Still = 1.77 K, 1K Pot = 1.78 K / 45 mbar. | |
| 1255 | Open V12a completely. | |
| 1300 | Close V9, leaving 44 mbar in dump. | |
| 1301 | Open gate valve to still pumping line. This causes a surge in 1K Pot pressure & temperature - interesting. Perhaps it's just more warm mix being pulled in through the condenser side as the pressure is released from the still side into the still pumping volume. | |
| 1307 | Start circulation procedure. V6 open at 12.0%. | |
| 1314 | No change in pressures until V6 opened to 13.0%. | |
| 1315 | MC(H35) = 1.86 K, Tower = 1.87 K, Cold plate = 2.19 K, Still = 1.82 K, 1K Pot = 1.78 K / 45 mbar. | |
| 1337 | At V6 = 13.8%, P1 pressure begins to fall into readable range. G1/G2 = 160/190 mbar, Still = 1.44 K / 85 mbar. MC and Cold plate down to 1.4 K. | |
| 1349 | V6 = 15.0%, G1/G2 = 125/130 mbar, Still = 1.04 K / 2.8 mbar. MC/Tower = 0.82/0.80 K, Cold plate = 0.75 K. | |
| 1357 | V6 = 16.0%, G1/G2 = 136/136 mbar, Still = 1.05 K / 0.85 mbar. MC/Tower = 680/650 mK, Cold plate = 556 mK. | |
| 1401 | V6 = 18.0%, G1/G2 = 124/124 mbar, Still = 1.07 K / 0.38 mbar. MC/Tower = 285/274 mK, Cold plate = 470 mK. | |
| 1405 | Open V6 to 100% | |
| 1411 | Open V14 to pump the rest of the mix into the fridge | |
| 1422 | P1 down to 3.8 mbar, dump mostly empty - close V14 | |
| 1423 | G1/G2 = 76/76 mbar, Still = 1.05 K / 0.12 mbar. MC/Tower = 59/64 mK, Cold plate = 147 mK. ←- good! Cold plate was stuck at 300mK last run! | |
| 1427 | 1K Pot = 1.79 K / 50 mbar. Close needle valve a little. | |
| 1436 | MC/Tower = 34/41 mK (already better than last run!) Cold plate = 138 mK, Still = 1.04 K / 0.12 mbar, 1K Pot = 1.74 K / 32 mbar. | |
| 1449 | MC/Tower = 28.3/37.0 mK. Cold plate = 137 mK, Still = 1.05 K / 0.11 mbar, 1K Pot = 1.74 K / 30 mbar. G1/G2 = 84/81 mbar. | |
| 1510 | MC/Tower = 26.6/35.8 mK. Cold plate = 137 mK, Still = 1.05 K / 0.11 mbar, 1K Pot = 1.74 K / 30 mbar. G1/G2 = 98/92 mbar. | |
| 1600 | MC/Tower = 26.4/35.6 mK. G1/G2 = 125/116 mbar. | |
| 1625 | Commence LHe transfer (37.6%). | |
| 1704 | End LHe transfer (93.6%). | |
| 1725 | Fill LN2 cold trap full. | |
| 1726 | MC/Tower = 26.2/35.5 mK. G1/G2 = 120/113 mbar. The pressures are creeping up - hopefully this will not be a problem. | |