2013/02/27
| 0935 | Stop flashing the detector. |
|---|---|
| 0943 | Fridge is at 1 K and G1 and G2 are 690, 630 mbar respectively. When I stopped flashing the detector, the temperature lowered a bit but G1 and G2 increased dramatically. |
| Rd 30 from DCRC 32: 0B00 - the FET heater was on; Rd 30 from DCRC 33: 0000. Not sure if this was a result of stopping the flashing. |
| 1015 | Filled LN2 cold trap. |
|---|---|
| 1025 | Cold plate: 5.14 kohms (~ 870 mK); Still: 4.04 kohms (~ 1.52 K). |
| Fed Cricket 4 pellets. | |
| 1145 | Mixing chamber temperature has been gradually rising and still pressure is very low at 20 μbar. Let's pull the mixture out and take a look at 4 K. First things first: single-shot test. |
| 1200 | Mixing chamber temperature is still rising, which is perhaps not too surprising considering that it's too warm at 848-855 mK for mixing. What is surprising is that G1 isn't decreasing very rapidly (currently at 767 mbar) and we do not appear to have very much He-3 in the fridge as G1 is at 418 mbar. This would indicate that the helium cold trap is blocked or there is a blockage further in the fridge. |
| 1205 | Open valve V5 on IGH to speed up mixture recovery. Stop 1 K pot and turn on mixing chamber heater to 10 mW. |
| 1741 | Turn off mixing chamber heater. |
| 1749 | Fed Cricket 4 pellets. |
| 1815 | Performed the leak check. Helium rate in the lines leading to the IVC was 6.0E-10 mbar*l/s. As soon as the IVC was open the leak rate started to drop. No leak in the IVC. |
| 1818 | Fed Cricket 4 pellets. |