| 0750 | Mixing chamber temperature 83 K. Start pumping out nitrogen exchange gas. |
| 0940 | Fill N2 cold trap about a litre shy. |
| 1415 | Stop evacuating IVC in preparation for nitrogen blowout. Mixing chamber temperature 81 K. |
| | Background helium leak rate in IVC 1.1E-9 mbar l/s. Start nitrogen blowout. |
| 1500 | Pump mixture into dump in preparation for throughput test. |
| 1540 | Cease nitrogen blowout. Helium leak rate 6.9E-9 mbar l/s: no gross leak. |
| 1635 | Evacuate and flush main bath with helium gas. Background helium leak rate 1.1E-8 mbar l/s. No change after filling main bath with helium gas: no gross leak. |
| 1637 | Evacuate 1K pot. |
| 1650 | Throughput test yields 18 mbar/min: too low. Pump mixture into dump to make another attempt. |
| | Background helium leak rate 1.1E-8 mbar l/s. No change after throughput test: no gross leak between mixing chamber lines and IVC. |
| 1655 | Isolate leak checker and evacuate IVC with turbo pump. |
| 1705 | Throughput test yields 14 mbar/min. We know that throughput test can give varying values. It is hard to believe that the mixture is not clean yet as it has been cryocleaned overnight. There may be a blockage in the mixing chamber lines, but they have been evacuated for at least a day. One worrying possibility is a hard block, but there is no reason one could have formed. Let's change operator. |
| 1720 | Throughput test yields 40 mbar/min: much better. Pump mixture into dump. |
| 1806 | Electrical check at 77K complete. On Dib 1 the problems with QETA/Ret and QETB/Ret are back, but additional problems have arisen: SQUID bias A, B, and D to return are open, and Feedback A and B are open. The other two dibs are okay. |
| 1844 | Begin slow LHe transfer (0%). |
| 2245 | Fed Cricket 4 pellets. |