2018/07/07 (Saturday)

Previous Day

	Status: DCRCs off. Trying to cool to base but getting stuck around 1K
0925	Tower = 1.6 K. Condenser = 342 mbar. V6 → 14.0%.
1145	Tower = 1.35 K. Condenser = 532 mbar, plateauing. Still = 5.5 mbar. Turn on Still heater to 5 mW
1230	Tower = 1.45 K. Condenser = 693 mbar, peaking. Still = 9.5 mbar. Turn Still heater back down to 0.1 mW
1430	Tower = 1.35 K. Condenser = 516 mbar and falling. Still = 6.0 mbar.
1615	Fill LN2 cold trap full.
1615	Tower = 1.35 K, G1/G2 = 432.6/391.3 mbar, 1K Pot = 1.692 K / 70 mbar.
1630	Tower = 1.35 K. Condenser = 407 mbar. Still = 9.5 mbar. Main bath = 14.2%
2050	For the last few hours, Condenser pressure is oscillating with a 20 minute period. Tower temperature also oscillating between 1.2 and 1.4 K. Looks like they are oscillating in phase. Still pressure oscillating between 10 and 40 mbar.
2055	V6 → 14.4%
2115	Tower = 1.1 K. Condenser = 235 mbar, settling. Still = 4.0 mbar. Oscillations seem to have stopped.
2140	Tower = 1.2 K. Condenser = 242 mbar. Still = 4 mbar. V6 → 15%. Condenser peaks at 265 mbar
2205	Tower = 405 mK and falling, Condenser = 239 mbar and falling, Still = 1.6 mbar.
2235	Tower = 286 mK and flat, Condenser = 210 mbar and falling, Still = 1.3 mbar.
2255	Tower = 274 mK, Condenser = 203 mbar, Still = 1.2 mbar. V6 → 100%. Condenser peaks at 230 mbar
2310	Tower = 94 mK, Condenser = 209 mbar, both falling. Still = 0.15 mbar.
2315	Tower = 46 mK, Condenser = 177 mbar, both falling. Still = 0.13 mbar.
	well this is annoying - now it's working, but we decided to skip the transfer because I thought we'd need to warm up
2315	MB = 2.7%
2330	Tower = 42 mK, now kind of flat. Condenser = 162 mbar and falling. Still = 0.12 mbar. Increase Still heat to 2 mW
2340	Tower seems stuck exactly at 42.24 mK. I think that means the resistance is higher than the range on the bridge, which I left at 67 kΩ, should increase it to 200 kΩ
0014	Tower = 28.7 K, G1/G2 = 175.8/362.8 mbar, 1K Pot = 1.660 K / 38 mbar.

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