| Setup | Run 73. DIB 1/3/4 → Stripline 43/48/41 → pi-filters 1/2/3 → Cable 3/1/2 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1)-master; DCRC33(2) → HV control. DCRCs on. Lead/poly shield erected (4 lead walls, 2 poly walls). |
| Status: | Cooling down after warmup to deal with 1K Pot partial blockage, helium in IVC. Started 1K Pot and circulation yesterday. |
| 0930 | MB = 63.4% |
| 1000 | MC(H35) = 31.8 mK, Still = 0.120 mbar, G1/G2 = 118/110 mbar. 1K Pot = 1.68 K / 24 mbar |
| 1010 | Take a look at the channels with the Pulse Viewer: strong pulses in DCRC1pB but weak in other channels |
| 1100 | Zach body temp = 97.4 |
| 1118 | Zach arrives at lab. |
| 1125 | Tower/MC/Coldplate = 68.6/31.4/192 mK, Still = 1.46 K / 0.120 mbar / 0 mW, G1/G2= 113/122 mbar, 1K Pot = 1.68 K / 24±2 mbar. |
| 1128 | Filled LN2 cold trap dewar from 5L dewar, mostly full. |
| 1130 | MB = 60.4% |
| 1133 | Zach leaves lab. |
| | Tower is disappointingly warm. Last cooldown the Tower was at 47.2 mK at this point, with the DCRCs on. Could be that the DCRCs are in a bad state. Let's try some zaps. |
| 1135 | Zap DCRC1&4 SQUIDs. |
| 1505 | Tower = 67.6 mK. Slowly cooling but still quite warm. Phonon channels look the same, strong pulses only in DCRC1pB. |
| 1610 | Try reducing DCRC1pD QET bias: from 410 all the way down to 240 uA, at this level it has strong pulses. |
| 2140 | Tower = 66.4 mK, cooling slowly |