2012/02/05
| 1448 | Filled LN2 cold trap. Still using LN2 from clean room dewar. |
|---|---|
| 1544 | Begin LHe transfer (25.5%). |
| 1625 | End LHe transfer (73.8%) |
| 1700 | Tower temperature, although a little erratic and has been increasing since last night, rose to just over 80 mK. That is acceptable for this ionisation-only run. We should keep monitoring the tower temperature, but for now I do not believe it necessary to clean the helium cold trap. We would have to pump out the mixture, isolate the trap and evacuate it overnight. We should do this before our next run, but for now, let's just keep an eye on it. |
| 1750 | Start flashing detector. |
| 1900 | Stop flashing detector. |
| 2145 | Temperature of 1 K pot is a little cold. Open needle valve a little more. |
| Start taking Ba-133 data: four half-hour runs per bias: -7 V; -8 V; -9 V; and -1 V. |