2019/09/22 (Sunday)
| Status: LN2 transfer two days ago. Fridge passed throughput test. Electrical checkout mostly OK. | |
| 0950 | MC(Cernox)/Sorb = 77.28/117.7 K |
| 1210 | Start LN2 transfer to main bath. |
| 1212 | MC(Cernox)/Sorb = 77.1/117.5 K, Level resistor = 1.354 kOhm This is higher than we usually let it go. Try to move the resistor up and down to test if we're in the LN2 yet, can't really tell. The whole resistor rod seems to get cooled through contact with the bath port, which may be significantly colder than when we do the initial transfer. |
| 1230 | Set up webcam to watch level resistance. Stop LHe level webcam script in Matt's jiajin crontab. Use webcamAutomater.py to upload an image of the LN2 level resistor to the K100 status webpage every minute. |
| 1232 | MC(Cernox)/Sorb = 77.1/116.7 K, Level resistor = 1.350 kOhm |
| 1230 | Fill LN2 cold trap from small dewar. |
| 1327 | MC(Cernox)/Sorb = 77.0/115.6 K, Level resistor = 1.358 kOhm |
| 1415 | MC(Cernox)/Sorb = 77.2/115.7 K, Level resistor = 1.356 kOhm. G1/G2 = 580/533 mbar, went down a little since the transfer started. Stop LN2 transfer. |