2018/07/19 (Thursday)

	Status: circulation and 1K Pot suspended yesterday. Mixture in dump, MC and Still heaters on at 20 mW each
	overnight: Tower steady at 5.4 K, Sorb around 7K and slowly increasing, 1K Pot around 5.5 K and slowly increasing
0940	Tower/Sorb/1K Pot = 5.4/7.3/5.7 K, IVC = 74 nbar
	The fact that we're stuck at 5.4 K even with the heaters on all night suggests a thermal connection to the 4K bath, e.g. helium in the IVC. Pressure in the IVC doesn't seem high but maybe I shouldn't trust the gauge? We should try pumping the IVC but first I'll try turning off the heaters like yesterday.
0945	Turn off MC and Still heaters
1020	Tower has fallen to 4.5 K, Pot and Sorb have gone up. 1K Pot >7K, Sorb = 10.6 K. Saw this yesterday too. It's as if having the heater on is boiling He into the IVC which cool the upper stages. Also IVC fell → 40 nbar (possibly lower, forgot to check it again)
1020	Turn MC and Still heaters back on → 20/20 mW
1035	Tower/Sorb/1K Pot = 5.5/7.5/5.9, IVC = 74 nbar, close to before
1040	Begin pumping IVC with turbo Tower/Sorb/1K Pot temperatures are all starting to rise
1150	Tower/Sorb/1K Pot = 7.9/11.1/>7 K
1228	Tower/Sorb/1K Pot = 10.2/14.1/>7 K. Turn MC and Still heaters down to 10/10 mW
1310	Tower/Sorb/1K Pot = 11.2/15.8/>7 K. Turn MC and Still heaters down to 5/5 mW
1500	Tower/Sorb/1K Pot = 12.2/16.1/>7 K. Turn MC and Still heaters down to 3/3 mW
1645	Tower/Sorb/1K Pot = 12.5/15.9/>7 K.
1648	Fill LN2 cold trap.