| Status | Run 77 in progress. |
| Setup To Be | Cable 2/1/3 → diverter/nothing/nothing → DCRC50(3)/DCRC55(1)/DCRCX(4) |
| 1100 | MC(H35) = 5.56 K, G1/G2 = 543/489 mbar, MB = -0.7% |
| | Begin another cooldown |
| 1145 | Begin LHe transfer @ MB = -1.0% |
| 1152 | Turn on 4He pump. Open Recovery valve to 4He pump. Pump out line to 1K pot (open V4a, close 1K pot speedivalve and slowly open the 4He-pump inlet valve).Close the 4He-pump inlet valve once done. Check pressure in 1K Pot (with V4a open, 4He pump inlet valve closed). 1K Pot = 0.25 bar (-22.5 inHg) on mechanical gauge. |
| 1205 | 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. |
| 1206 | Open 4He pump valve fully |
| 1208 | MC(H35) = 5.48 K, cooling slowly. 1K Pot = 3.3 K / 1.2 mbar |
| 1209 | Turbo on IVC = 1 nbar, after being valved out for 1 min IVC = 6.3 nbar, open turbo again and close valves to IVC |
| 1213 | Open 1K Pot needle valve → 15° (half a unit mark). 1K Pot (P2) → 2.75 K / 9.0 mbar |
| 1219 | MC temp dropping |
| 1220 | Open 1K Pot needle valve → 30°. 1K Pot → 2.20 K / 26 mbar. |
| 1234 | Ended LHe transfer @ MB = 93.8% |
| 1243 | MC(H35)/1Kpot = 2.47/1.62 K, MC temp dropping linearly. G1/G2 = 115/123 mbar . 1K Pot(P2) = 20 mbar. |
| 1248 | Fill LN2 cold trap dewar |
| 1251 | P2 at 11 mbar now, open 1K Pot needle valve → 37.5°. 1K Pot → 1.58 K / 13 mbar. |
| 1255 | P2 at 11 mbar again, open 1K Pot needle valve → 45°. 1K Pot → 1.57 K / 13 mbar. |
| | MC temp is settling around the He transition point (2.17K) maybe this is why P2 goes often goes low at this point |
| 1300 | MC(H35)/1Kpot = 2.14/1.56 K and flat. G1/G2 = 58.9/51.8 mbar . 1K Pot(P2) = 11 mbar. |
| 1301 | Close V3 and V9, leaving 51.4 mbar mixture in dump. |
| 1302 | Turn on 3He pump |
| 1304 | Start circulation through Trap 1. V6 → 12.6%. Condenser(G1) peaks at 372 mbar. MC(H35) → 1.65 K. Still → 1.64 K / 55 mbar. P2 jumped up over 100 then fell to 50 mbar |
| 1308 | Close 1K Pot needle valve → 30°. 1K Pot → 1.62 K / 20 mbar. |
| 1311 | V6 → 13.0%. Condenser(G1) peaks at 231 mbar. MC(H35) → 1.23 K. Still(P1) → 1.26 K / 5.0 mbar. |
| 1314 | V6 → 13.4%. Condenser(G1) peaks at 188 mbar. MC(H35) → 1.14 K. Still(P1) → 1.16 K / 2.8 mbar. |
| 1317 | V6 → 13.8%. Condenser(G1) peaks at 179 mbar. MC(H35) → 1.08 K. Still(P1) → 1.12 K / 1.9 mbar. |
| 1322 | V6 → 14.4%. Condenser(G1) peaks at 190 mbar. MC(H35) → 0.81 K. Still(P1) → 1.10 K / 1.1 mbar. |
| 1326 | V6 → 15.0%. Condenser(G1) peaks at 192 mbar. MC(H35) → 0.57 K. Still(P1) → 1.11 K / 0.7 mbar. |
| 1330 | V6 → 100.%. Condenser(G1) peaks at 197 mbar. MC(H35) → 0.34 K. Still(P1) → 1.05 K / 0.2 mbar. |
| 1402 | MC(H35) = 35.5 mK and pretty flat, G1 = 125.4 mbar and pretty flat. 1K Pot = 1.63 K / 24 mbar. |
| 1403 | Open V14 to pull the rest of the mixture out of the dump into circulation. |
| 1404 | MC(H35) rises to 94 mK, Still maxes out at 1000 then falls again, Condenser(G1) rises to 220 mbar. 1K Pot unaffected. |
| 1408 | MC(H35) rises further to 111 mK, then falls |
| 1409 | Plug in DCRCs |
| 1427 | P1 = 0.85 mbar (<1), close V14 |