2020/03/08 (Sunday)
| Setup | Run 72. DIB 1/3/4 → Stripline 43/41/48 → Cable 3/2/1 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1). DCRCs on overnight. Lead/poly shield erected (4 lead walls, 2 poly walls). |
|---|---|
| Overnight: Tower has been warm since Friday when we disconnected the DCRCs. This morning it was around 85 mK. Turned the Still heater off for a while, rose to 95 mK. Turned Still heater back to 10 mW, Tower fell to around 70 mK. | |
| 1030 | Tower/MC/Coldplate = 71.5/59.6/195 mK, Still = 1.65±0.10 K / 0.240 mbar / 10 mW, G1/G2= 609/567 mbar, 1K Pot = 2.30 K / 32 mbar. MB = 63.6% |
| 1040 | open 1K Pot needle valve wider, 60°→70°. 32→38 mbar, 2.296→2.320 K |
| 1045 | open 1K Pot needle valve wider, 70°→80°. 38→40 mbar, 2.320→2.333 K |
| no change to Tower temperature which is slowly rising. Circulation pressures slightly higher. | |
| 1050 | close 1K Pot needle valve narrower, 80°→40°. 40→19 mbar, 2.333→2.248 K |
| 1055 | Fill LN2 cold trap bath |
| 1100 | Tower = 76.7 mK. Not rising currently. Maybe it will start to fall again. |
| 1100 | Check phonon channels. There are pulses, most are weak, DCRC1pB (Side1pA) is an exception, those are strongish. Try applying 100V bias. Then dial back down to zero. |
| 1110 | Tower = 81.2 mK and rising. Lame. Probably this is hte reaction to the LN2 fill. Maybe it will still go down. 1K Pot = 2.22 K / 19 mbar |