| Status | Run 77 in progress. |
| | Cooling to base today |
| 1227 | Turbo on IVC = 1.2 nbar, with turbo valved out for a min IVC = 12 nbar |
| 1230 | Open up turbo again, close IVC valves on top of fridge |
| 1234 | Turn on 4He pump. Open Recovery valve to 4He pump. Pump out line to 1K pot (speedivalve closed).Check pressure in 1K Pot (with V4a open, 4He pump inlet valve closed). 1K Pot = 0.24 bar (-22.8 inHg) on mechanical gauge. |
| 1242 | Pump out 1K Pot slowly, opening the 4He pump valve until it just starts to make noise, then opening it more when it becomes more quiet. |
| 1244 | Start pumping 1K Pot continuously |
| 1249 | Fill LN2 cold trap dewar |
| 1250 | MC(H35) = 5.32 K, cooling slowly. 1K Pot = 3.37 K / 1.7 mbar, cooling slowly |
| 1252 | Open 1K Pot needle valve → 15° (half a unit mark). 1K Pot (P2) → 3.06 K / 6.0 mbar |
| 1255 | After about 3 minutes, MC temperature started dropping MC(H35) = 5.23 K |
| 1256 | Stopped filling LN2 dewar |
| 1259 | Open 1K Pot needle valve → 30°. 1K Pot → 2.6 K / 18 mbar. MC(H35) = 3.4 K |
| 1304 | Open 1K Pot needle valve → 45°. 1K Pot → 1.91 K / 30 mbar MC(H35) = 3.25 K |
| 1306 | G1/G2 = 345/334 mbar dropping linearly |
| 1310 | MC(H35)/1Kpot = 3.08/1.72K dropping linearly |
| 1327 | MC(H35)/1Kpot = 2.38/1.63K still dropping linearly. G1/G2 = 97/116 mbar . 1K Pot(P2) reads 20 mbar. |
| 1345 | Repaired the broken wire on the Tower Rox thermometer plug, should take measurement for this thermometer this time |
| 1347 | MC(H35)/1Kpot = 2.09/1.557 K still dropping linearly. G1/G2 = 58/61.6 mbar . 1K Pot(P2) reads 8.0 mbar. |
| 1351 | Close V3 and V9, leaving 58.6 mbar mixture in dump. P2 jumped up to 32 mbar and coming down slowly. |
| | I will do the rest of the cooldown remotely |
| 1521 | Turn on 3He pump |
| 1525 | Start circulation through Trap 1. V6 → 12.6%. P2 went to 40 mbar and came back down. Condenser peaks at 298.2 mbar. MC(H35) → 1.39 K. Still(P1) → 1.43 K / 14 mbar. Took about 2 minutes for P1 to start reading below max. |
| 1531 | V6 → 13.0%. Condenser(G1) small bump at 252 mbar. MC(H35) → 1.19 K. Still(P1) → 1.21 K / 5.0 mbar. |
| 1537 | V6 → 13.4%. Condenser(G1) peaks at 231.3 mbar. MC(H35) → 1.14 K. Still(P1) → 1.18 K / 3.2 mbar. |
| 1544 | V6 → 13.8%. Condenser(G1) peaks at 230.8 mbar. MC(H35) → 1.08 K. Still(P1) → 1.23 K / 3.2 mbar. |
| 1557 | Power cycling DCRC1 and DCRC4 |
| 1602 | V6 → 14.4%. Condenser(G1) peaks at 247.5 mbar. MC(H35) → 0.66 K. Still(P1) → 1.19 K / 1.3 mbar. |
| 1612 | V6 → 15.0%. Condenser(G1) peaks at 242.9 mbar. MC(H35) → 0.377 K. Still(P1) → 1.18 K / 0.7 mbar. |
| 1621 | V6 → 100%. Condenser(G1) peaks at 234.2 mbar. MC(H35) → 0.166 K. Still(P1) → 1.11 K / 0.14 mbar. P2 remain steady at 32 mbar during the process of opening up V6 |
| | We were power cycling the DCRCs to see channels live during the above steps |
| 1701 | MC(H35) = 33.8 mK and pretty flat, G1 = 163.5 mbar and pretty flat. 1K Pot = 1.66 K / 30 mbar. |
| 1702 | Open V14 to pull the rest of the mixture out of the dump into circulation. P1 peaks at 340 and comes back down slowly |
| 1706 | MC rises to 88 mK, Still peaks at 263 mbar (on readout) then falls again, Condenser(G1) rises to 253 mbar. 1K Pot unaffected. |
| 1708 | MC seems to have a second wind and is rising again to 97.3 mK, condenser is falling like usual |
| 1734 | P1 = 0.55 mbar (<1), close V14 |