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2015/10/13 (Tuesday)

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Current setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50.
Overnight: Taking background data. Tower temperature stable between flashes.
Below readings taking after a flash, cooled most of the way to base:
0900 Tower/MC(H35)/MC sensor/Cold Plate = 31.1/25.9/42/161 mK, Still = 1.41 K / 0.11 mbar, G1/G2 = 145/145 mbar, 1K Pot = 1.72 K / 20 mbar, Main bath = 74.1%
G1 and G2 nearly equal - is there an impedance building up in one of the traps?
0905 Fill LN cold trap Dewar.
1445 With MIDAS tests complete, place Cf source inside shield at top of shield for Cf data runs.
Set thresholds to yesterday's values.
1450 Start Cf data : 22 cycles of 15min series at -/+2V, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown in between.
Rate looking good.
1526 During cooldown, remove Cf source from shield to measure dimensions. Cf source 0.234“ in diameter, 0.47” long. Threaded hole is 4-40.
1528 Place Cf source back inside top of shield before next data series begins.
1650 Main Bath = 62.8%
1655 During cooldown, fill LN2 cold trap full.

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