2020/07/23 (Thursday)

0810	Matt Fritts body temperature = 97.5 F
Setup	Run 73. DIB 1/3/4 → Stripline 43/48/41 → Cable 3/1/2 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC50(3)-master; DCRC33(2) → HV control. DCRCs on overnight. Lead/poly shield erected (4 lead walls, 2 poly walls).
0730	MB 27.1%
0810	Tower = 56.6 mK, G1/G2= 262/240 mbar, Still = 0.150 mbar / 5 mW, 1K Pot = 1.67 K / 36±2 mbar.
	Tower has wavered, fell as low as 60.4 mK at 3am then wandered back up. More steady for the last 4 hours.
0920	Tower/MC/Coldplate = 56.5/30.4/188 mK, Still = 1.45 K / 0.15 mbar / 5 mW, G1/G2= 263/240 mbar, 1K Pot = 1.67 K / 36±2 mbar.
0946	Begin LHe transfer @ MB = 21.0%
1005	Try adjusting phonon channels. Lowered a number of QET biases, now see strong pulses on every working channel (DCRC4pA/Side1pE is not operational, like last run it behaves like an open TES). But there is ugly noise. Let's try zapping SQUIDs.
1005	ZAP all SQUIDs on DCRCs 3&4
1010	Fill LN2 cold trap bath
1023	End LHe transfer @ MB = 92.6%

quick SQUID Tuning notes:

Trigger on Test Signal
Connect Test Signal to feedback, 400 Hz, maybe 100 mVpp
Set Polarity to OPEN and ADCsource to PREAMP
Start with QET bias = 0, Lockpoint = 0, SQUID bias = 0
Increase SQUID bias (negative for RevC.1, positive for RevC) to maximized modulation depth (Vpp) while avoiding cusps
Increase Lockpoint (negative for RevC.1, positive for RevC) so that x-axis intersects at point with high slope
then set back to normal: disconnect test signal, set ADCsource to FEEDBACK, set Polarity to NON-INVERTING

1100	Tune SQUID settings on DCRC3pC (we did DCRC3pB yesterday)
	Seeing some ugly noise on most channels. Let's try powercycling the DCRCs
1105	Turn off DAQ programs, unplug DCRCs
1110	Power DCRCs, restart DAQ programs. ZAP all SQUIDs on DCRCs 3&4
1150	Try to find good QET biases for all working channels. Some of them have very ugly pulses shapes, others OK
1155	MB = 91.1%
1230	The tube for transferring LN2 burst today. Trying to order another from the chem stockroom.
1325	Rig up a long copper pipe to attach to the LN2 Dewar which extends all the way to the LN2 Trap Bath Dewar
1400	Pick up new tubing from Chem Stockroom
1400	Matt finally leaves lab
1705	Do quick IbIs on DCRC4pB. It turns out that the QET bias we chose to use earlier is not fully in the transition region. so we chose a lower value. But the pulse shapes at this lower value are ugly.
2145	Matt Fritts body temperature = 98.6 F