| 0545 | Shield erected. |
| | Decrease temperature of 1 K pot to 1.65 K. Mixing chamber temperature has stabilised at 88.6 mK, however DCRCs have not been connected yet. This is probably the best we can hope for. Time to plug in the DCRCs. |
| 0630 | Fill N2 cold trap full. |
| 0850 | It looks as though DCRC33 has developed a fault: was working fine, then started triggering on what seemed to be logic pulses in the charge channels. Qo was the first to start, then Qi. Frequency of pulses slowly increased until eventually, the trigger rate went crazy. Both multiple soft and hard resets of the board had no effect. If anything, the situation got worse as the charge traces eventually flatlined. Turning on the FET heater seemed to work for brief periods of the order of half-a-second. A quick electrical check with the breakout box showed no signs of a problem, and DCRC31 is having better luck. Looks like DCRC33 needs to be sent back to Sten. Will take a closer look once this run is over. |
| | DCRC32 plugged in DIB 1, DCRC31 plugged into DIB 2. DCRC32 is master. Triggers set at 28 (Qi DIB 1), 40 (Qo DIB 1), 36 (Qi DIB 2) & 40 (Qo DIB 2) ADC bins. Commence with 4-hour flash followed by 2-hour cooldown. Four files (1000 events per file) at each bias in 5/0.1/20 minutes acquisition/flash/cooldown sequence. Order of biases: +/-4 V; -/+4 V; +/-3 V;-/+3 V; +/-2.5 V; -/+2.5 V; +/-2 V; -/+2 V; +/-1 V; -/+1 V; +/-8 V; -/+8V. |
| | LEDs 1 & 2 on DIB 1 and LED 1 on DIB 2 used. LED 1 on DIB 1 did show some sign of leakage during tower level continuity checks, but is probably fine. LED 2 on DIB 2 showed signs of leakage and hence isn't used. Mixing chamber temperature just shy of 130 mK, which seems a little low. Additionally, if memory serves, rate of temperature rise was rather poor. It is possible one of the LEDs isn't firing. Hopefully, a 6 second flash with whatever LEDs we have left should suffice to neutralise the crystal - it should be enough. |
| 0935 | Commence helium transfer. Helium liquid level 16.9%. |
| 1015 | Cease helium transfer. Helium liquid level 81.1%. Hopefully, fridge will calm down before data acquisition commences. Will stay for an hour to monitor fridge. |
| 1505 | Data acquisition commenced without incident. However, mixing chamber temperature rose 2 mK at most during flash. I suspect that only one LED is working. Hopefully, this is good enough to neutralise the crystal - we shan't know for a while. |
| 1535 | Fill N2 cold trap full. |