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2017/03/03 (Friday)

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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
Took data overnight, HV = 10 V.
0855 HV=9.99V, Vleak = 0.2 mV, V_crystal = 9.91 V
0855 Tower = 33.7 mK, Main bath = 28.8%
0900 Fill LN2 cold trap bath
1111 Tower/MC/Coldplate = 33.7/31.2/187mK, Still = 1.16 K / 0.110 mbar, G1/G2 = 250/211 mbar, 1K Pot = 1.692 K / 28 mbar, Main bath = 24.9%. Boil off rate: nearly slow mode (predicted level: 25.1%).
1130 Start LHe transfer (MB = 23.9%). Pressure lowered to 1.5 psi.
1220 End LHe transfer (MB = 93.2%)
1556 Attempt to measure IbIs of DIB1 PB. However, it is currently -ADC railed beyond Driver Offset range. Re-locking SQUID does not help, nor does snapping.
1601 Can get trace to show by reducing FEgain to 3, driver offset = -2
1608 The FEgain seems to have a strange effect here. Increasing it from 4 to 5 makes the traces very noisy, but leaves the baseline alone. Increasing it further to 6 cleans up the noise, but pulls the baseline down considerably. Further increasing the FEgain to 7 -ADC rails the channel.
DIB1 PB, FEgain = 4 DIB1 PB, FEgain = 5 DIB1 PB, FEgain = 6
1651 Reduce HV to 0 V
1655 Same effect as above is observed.
1657 Zap SQUIDs.
1717 That seems to have fixed it.
1718 Start 12 hour bake
1747 Fill LN2 cold trap full.

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