| 1230 | MC(Cernox)/Sorb/1K Pot = 4.77 K/–/5.94 K, G1/G2 = 455/445 mbar, MB = 71.7% |
| 1230 | Turbo on IVC = 74 nbar. With Turbo valve out for 1 minute IVC = 100 nbar |
| | Close IVC valves on top of fridge |
| 1240 | Pump out line leading to 1K Pot with scroll pump (V4a open, V1a closed, 1kpot speedivalve closed). Then switch the line over to the 4He pump. Turn on 4He pump and make sure the pump exhaust is connected to recovery and open valve to recovery lines. |
| 1241 | Check pressure in 1K Pot by opening the 1kpot speedivalve with V4a closed: Mechanical gauge = ~300 mbar on G3. |
| 1241 | Pump out 1K Pot by slowly opening V4a then the manual valve at the 4He pump until it just starts to make noise, once it quiets down somewhat open it up a little more. continue this until the valve is fully open. |
| | Leaving mixture in the fridge when starting 1K pot. P2 < 1 mbar. 1K Pot = 6.3 K(2206 ohm) |
| 1245 | Open 1K Pot needle valve → 15° (half the unit on the needle marks). 1K Pot → 3.29 K (3068 ohm) / 4 mbar. |
| 1247 | Temp dropping slightly, MC(cernox) = 4.76 K |
| 1248 | Open 1K Pot needle valve → 30°. 1K Pot → 2.67 K / 10 mbar. |
| 1250 | Open 1K Pot needle valve → 45°. 1K Pot → 2.31 K (3339 ohm) / 28 mbar. |
| 1251 | Temps start to drop, mixture pressure starts to drop |
| 1300 | MC(H35) temp drops, linear at around 3.2 K |
| 1308 | MC(Cernox)/MC(H35) = 2.72/–, 1K Pot = 1.85 K(3571 ohm) / 20 mbar. G1 (fridge+dump) = 200 mbar. |
| 1318 | MC(Cernox)/MC(H35) = 2.38/–, 1K Pot = 1.76 K(3632 ohm) / 15 mbar. G1 (fridge+dump) = 150 mbar. |
| 1320 | Close V5 and V9, leaving 140 mbar in the dump. Turn on 3He pump. |
| 1325 | Start circulation through Trap 1. V2 → Mark 1+ mark2. Condenser(G1) peaks at 300 mbar. P2 jumps to 100 mbar before falling again to 20 mbar. MC(Cernox) → 1.66 K. Still(P1) → 1.76 K / max mbar, Coldplate = 2.03 K, 1K Pot = 1.75 K (3638 ohm) |
| 1331 | V2 → mark 3. Condenser(G1) peaks at 320 mbar. MC(Cernox) → 1.24 K. Still(P1) → 1.22 K / max mbar, Coldplate = 1.39 K, 1K Pot = 1.73 K (3650 ohm) |
| 1334 | V2 → mark 4+ 1 full turn now. Condenser(G1) didnt peak, still at 250 mbar. MC(Cernox) → 1.14 K. Still(P1) → 1.10 K / max mbar, Coldplate = 1.05 K, 1K Pot = 1.71 K (3667 ohm) |
| 1334 | Made two full turns slowly while keeping G2 and P2 stable but no lower temp. MC temp(Cernox) seems to be flattening at 1.07 K |
| 1345 | After slowly opening VT(earlier called V6) and keeping an eye on G2, MC started showing more cooling at a point. VT(earlier called V6) must be ~12% at this point. Condenser(G1) peaks at 200 mbar. MC(Cernox) → 0.86 K. Still(P1) → 1.14 K / – mbar. |
| | P2 is not sensitive at this point so we can just monitor G1 while opening the VT valve |
| 1353 | VT might be fully open → 100.%. Condenser(G1) at 150 mbar. MC(Cernox) → 0.532 K. Still(P1) → 0.784 K / 300 mTorr, Coldplate = 0.713 K, 1K Pot = 1.80 K (3602 ohm) |
| 1355 | Open V10 in bursts to let the remaining mix out of the dump and into circulation. Condenser peaks slightly to 250 mbar. |
| 1430 | Tower(U28)/MC(Cernox)/Coldplate = 425 mK/6.7 mK/354 mK, Still(P1) = 0.916 K / 300 mTorr / 0 mW, G1/G2 = 220/200 mbar, 1K Pot(P2) = 45° / 1.80 K / 20 mbar, MB = 50% |