2015/12/21 (Monday)
| 1050 | Fridge temperature around 110 K and oscillating/increasing slowly. G1=4.3 mbar, G2=564 mbar, P1=.9 mbar, P2=0.024 mbar. Isolate cold traps by closing all valves on IGH. P2 drops to 0.022 mbar. Out of habit close manual valve to He4 pump before turning it off. Note that Zlatibor is not letting me log in, but works after hard restart. |
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| 1230 | Cf source places in shielding near detector for activation over break. Notice that at 10:54 (just after last diary entry), fridge temperature stopped oscillating and is now just steadily rising. I imagine this has something to do with the He4 pump being turned off, but I am not sure exactly how. Fridge temperature can now be more clearly seen at 107 K. G1=2.8 mbar, G2= 568 mbar, P1=0.95 mbar, P2=0.024 mbar. Turbo pump reads 2.5E-6 mbar. |