| 0405 | Fill N2 cold trap full. |
| | Commence cryocleaning mixture through nitrogen cold trap 2. Dump pressure 631 mbar. |
| 0630 | Mixing chamber temperature has dropped below 81 mK - good enough. Start pumping exchange gas out of IVC. |
| 1440 | Fill N2 cold trap full. |
| 1520 | Background helium leak rate 2.6E-9 mbar l/s. Commence nitrogen blow-out. |
| 1615 | Helium pressure has dropped. Leak rate increased gradually to 3.3E-7 mbar l/s. Normally, one would call this a gross leak. However, the way the leak rate increased over the course of the blow out wouldn't seem to indicate that it is anything other than background. |
| 1630 | Since turning off helium gas, leak rate has increased to 3.6E-6 mbar l/s. Not sure what that means. Start evacuating main bath. Leak rate has started to decrease. Not sure what that means either. |
| 1640 | Pressure in main bath <1 mbar: no liquid nitrogen left. |
| | Helium leak rate has dropped to 3.2E-7 mbar l/s, and is continuing to fall very slowly. Time to try filling the main bath with helium. |
| 1650 | Overpressurise main bath with helium. Leak rate started to rise immediately. It appears to have plateaued at 4.5E-6 mbar l/s. This is almost certainly a sign of a leak. We should lower the dewar. |
| 1655 | Isolate leak checker and leave turbo pump isolated. Pressure in IVC <4.6E-3 mbar (low pressure gauge is faulty). Let's see if IVC pressure increases. |
| 1735 | Lower dewar. IVC pressure <4.6E-3 mbar. |