2017/04/13 (Thursday)

Previous Day

	Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → HVConn 1/3/2 → HV 1/2 → DCRC55/DCRC33
0840	Tower = 33.4 mK, Main Bath = 74.3%.
0845	Fill LN2 cold trap bath.
1209	Investigating noise on DCRC2 PB, the “crossover” channel. Looked at SC PSD while turning on/off HV supply and while connecting DIB2/3 HV board ground planes with copper strip by hand.

HV on @ 0V	HV off	HV on @0V grounds connected	HV off grounds connected

	The HV supply seems to introduce some low frequency noise, but most noise is dealt with by shielding the signal lines by connecting the ground planes with a copper strip. Note, it seems that simply connecting them with a wire is not sufficient. A cursory look suggests that other channels are not significantly affected by connecting these grounds, which does create a ground loop.

1410	About to change to 2-sided mode. Unsure of how to save an odb file for later loading, but the last automatically saved one in this configuration would have been for run 6065. This should be saved in livedata if we need it.
1412	Stop MIDAS dcrc programs and power down DCRCs. Remove HV board.
1423	Switch to 2-sided readout. Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → DCRC55(1)/33(2)/X(4)
1433	Use Feb 8 SQUID settings on R62 summary page to set SQUIDs in ODB.
1435	Power on DCRCs 55,33,X
1438	All 3 respond to telnet commands. Start ODB programs. All seem to respond correctly.
1448	Zap SQUIDs on DCRCs 1-3. Oops! Now we're actually using DCRCs 1,2,4.
1451	Zap SQUIDs on DCRCs 1,2,4.
1504	Rough TES tuning shows pulses on DCRC1 PA-PD, DCRC2 PB,PC, and DCRC PB-PD channels. As expected, Side2 PB,PC are not working.
	Tower temp has meanwhile partially recovered from zapping, but it's bounced at 40mK, G1/G2 slowly returning to normal.
1523	Try cooling further by turning off DCRC1 15V power, but fridge heats dramatically. This behavior was seen earlier in the run. Turn DCRC1 15V power back on.
1541	* Tower/MC/Coldplate = 44.9/33.5/186 mK, Still = 1.2 K / 0.120 mbar, G1/G2 = 250/221 mbar, 1K Pot = 1.692 K / 30 mbar. MB = 64.1%. Boil off rate: close to slow mode (predicted level: 65.8%).
1605	Tower has been cooling for last half hour, now down to 43 mK. In February we were able to run in the current configuration with a base of 36 mK. It looks like maybe it's still cooling but it sorta looks like it may be stuck around this temperature.
1630	Tower definitely looks flat now at 43 mK
1745	Fill LN2 cold trap full.
1815	Finish IbIs data for DCRC1pA/DIB1pA/Side1pE and DCRC1pB/DIB1pB/Side1pB

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