| Status | Partial warmed up yesterday. Plan is to cooldown again and see if we can hold at base temperatures. MC(H35) = 6.12 K slowly going upwards. |
| 1207 | Pumped mixture back to dump |
| 1237 | Pumped contaminants from the cold trap 1 ~ 600 mbar |
| 1238 | Flow mixture into both sides of fridge |
| 1249 | 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 = 100 mbar on G3. |
| 1302 | 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. |
| 1304 | Open 4He pump valve fully |
| 1304 | MC temp dropping very slowly. P2 = 60 mbar. Pumping on 1K pot shows P2 fluctuating around 1 mbar =⇒ ice in it. So, I have opened the needle valve enough that there is more LHe pumping and things can get cooled down |
| 1305 | MC(H35) = 4.7 K, cooling fast now |
| 1305 | Open 1K Pot needle valve → 45° (3x half a unit mark). 1K Pot (P2) → – K / 60 mbar |
| 1320 | MC(H35) = 3.27 K |
| 1330 | MC(H35) = 3.11 K, MC temp dropping linearly. G1/G2 = 360/350 mbar . 1K Pot(P2) = 60 mbar |
| 1402 | MC(H35) = 2.39and flat. G1/G2 = 156.5/151.7 mbar . 1K Pot(P2) = 60 mbar |
| 1405 | Close V5 and V9, leaving 140.0 mbar mixture in dump. Turn on 3He pump. |
| 1406 | Start circulation through Trap 1. V2 → base+mark 1. Condenser(G1) peaks at 280 mbar. MC(H35) → 2.02 K |
| 1411 | P2 shoot up, Turned 1K pot needle valve to 30 deg or so. |
| 1414 | V2 → base+mark3. Condenser(G1) peak at 400 mbar. MC(H35) → 1.47 K. |
| 1417 | V → completely open (more than 180 deg turned anticlockwise). Condenser(G1) remains flat at 400 mbar. MC(H35) → 1.38 K |
| | We will open VT(earlier called V6) manual valve now. Keep it turning a few deg at a time and check that G1/G2 is not shooting up. When the MC temp drops, we know that it is opening as expected. P1 will also come in range. |
| 1435 | Keep turning VT till P1 is lower 1000 mTorr range. |
| 1439 | Open V6 to pull the rest of the mixture out of the dump into circulation. Then, close it after a minute. |