| | Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55(1)/33(2)/50(3), Tower has been cooled below Al transition with mu-metal shield at standard position |
| | DCRCs unpowered overnight |
| 0705 | Tower/MC/Coldplate = 38.9/34(?)/143 mK, Still = 1.16 / 0.050 mbar, G1/G2 = 150/145 mbar, 1K Pot = 1.40 K / 1.4 mbar, MB = 22.4% |
| 0710 | Tweak open 1K Pot needle valve a few degrees |
| 0715 | Fill LN2 cold trap bath |
| 0718 | Begin LHe transfer |
| 0757 | End LHe transfer @ 77.0% |
| 0800 | Tower = 36.4 mK, Still = 0.065 mbar, G1/G2 = 180/175 mbar, 1K Pot = 1.52 K / 5.5 mbar. Tweak 1K Pot needle valve open a little more |
| 0807 | Release pressure from MB, 10 min after transfer |
| 0833 | Release pressure from MB, 36 min after transfer |
| 0835 | Tower temperature spikes for no reason, to 45 mK. 1K Pot back down to 5.5 mbar, circulation and still pressures falling - tweak 1K Pot needle valve open again. |
| 0840 | Tower temperature falling again |
| | notes on packaging detector stack from iT4 for transport to SD |
| 1110 | Tower temp = 38.5mK. P2: 3.4 mbar. Tweak open 1K Pot needle valve. |
| 1130 | Tower temp has risen to 42mK, though the 1K Pot seems to still be filled. P1: 90ubar. Turn on Still Heater to 1.0mW. |
| 1133 | Tower temp = 39.8mK. P1: 100ubar. Increase Still Heater to 2.0mW. |
| 1136 | Tower temp = 39.6mK. P1: 120ubar. |
| 1138 | Tower temp = 39.2mK. P1: 120ubar. |
| 1143 | Tower temp = 38.3mK. P1: 120ubar. |
| 1145 | Perform mini-electrical check on DIB1 to compare w/ the charge channels measured on DIB2 yesterday. Both Qi and Qo Feedback to Drain/Source measure ~18nS like DIB2 Qi did. So DIB2 Qo was the problem channel, it would seem. |
| 1148 | Tower temp stabilizing at 38.2mK. P1: 120ubar. |
| 1158 | Tower temp = 37.7mK. P1: 120ubar. |
| 1245 | Went into clean room and hooked up N2 supply line to Tower transport canister to flush with N2 gas. Filled with N2 gas to 15psi then opened to let pressure decrease to just above 1atm. Did this 15 times, which should be more than enough. On last purge, let the pressure fall to 8psi, then close valve to isolate canister. |
| | Tower temp = 36.5mK and holding relatively stable. |
| 1340 | Place piece of tape on pressure gauge of Tower transport canister to mark the 8psi I filled it with. This will let us keep an eye on whether it's slowly losing pressure. |
| | Tower temp = 35.7mK and steady. P1 = 110ubar, G1/G2 = 235/223 mbar, 1K Pot = 1.56K / 7.0mbar. May need to tweak open 1K Pot soon. |
| 1430 | Tower temp spikes from 36mK to 44mK, then begins decreasing. |
| 1435 | Tower temp back down to 37.0mK and still coming down. P2 down at 6.0mbar. Tweak open 1K Pot needle valve. |
| 1455 | Tower temp = 35.5mK. P1 = 120ubar, G1/G2 = 251/238 mbar, 1K Pot = 1.64K / 22mbar. |
| 1457 | Power on DCRC1. Tower temp spikes to 40.3mK then begins dropping. |
| 1535 | Tower temp = 37.4mK after dropping to ~36mK after the DCRC had been powered. Now it's slowly rising. P1: 120ubar, so that seems fine. The 1K Pot = 1.58K / 9mbar, so that might need adjustment. The DCRC1 phonon channels look good, but we need to zap. Let's see how that affects temperature. |
| 1545 | Tower temp = 37.8mK and still cooling down. Though P2 has dropped to 8mbar, and P1 is at 110ubar. Tweak open 1K Pot a little more. May need to raise Still Heater another mW. |
| 1813 | P2: 9mbar. Tweak open 1K Pot needle valve. Tower temp 37.4mK. |
| 1820 | Fill LN2 cold trap full. |