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2014/04/17

1300 Fill LN2 cold trap full.
1330 Commence LHe transfer (7.6%).
1410 Complete LHe transfer (75.5%).
2355 Start ionisation data acquisition: 4 hour flash, followed by 2 hour cool down. Trigger on phonon channels, but trace length and lookback time 0.4096 ms & 100 μs respectively. Ba-133 source present. Bias sweeps as follows: +/-8 V; -/+8 V; +/-6 V; & -/+6 V. Data acquisition/flash/cooldown = 5/0.1/20 minutes. Four series at each bias.