| 1205 | Commence leak check with background leak rate of of 2.6E-9 mbar*l/s. Top flange showed slight increase/fluctuations with a maximum leak rate of 2.71E-9 mbar*l/s, though this is not considered significant or any indication of a leak. The stripline flange and both IVC flanges showed no change from the background. Overall, no indication of a leak was found. |
| 1401 | Fill LN2 Cold Trap Full. |
| | Raised Dewar. |
| 1600 | IVC pressure 4E-5 mbar. Open line to leak checker and isolate turbo pump. Evacuate 1 K pot and leave open to overpressurise with helium gas. Background helium leak rate 2.6E-9 mbar l/s. Overpressurise main bath with He-4 gas. Helium leak rate rises to 1.7E-8 mbar l/s before falling again. There is a leak, but is appears to be similar to what plagued us the previous run, ie. a leak dependent on differential pressure. Probably best to proceed as it didn't affect the previous run. |
| 1610 | Added 1 mbar He exchange gas. Commence Nitrogen transfer. |
| 1845 | Nitrogen liquid level meter reads 1.34 kΩ. Cease nitrogen transfer; attach ping-pong ball. |
| 2350 | Mixing chamber temperature 77.3 K. Start pumping He-4 exchange gas out of IVC. |
| | Attempted to start cryocleaning the mixture, but G2 rose to around 940 mbar. Shall investigate problem tomorrow. |