| Tower installation |
| | SE/NW/W → Tower Face 5/2/3 → SQUETs ZC-13/ZC-70/ZC-39+interposer → Striplines 41/43/48 → Cables 2/3/1 |
| 1045 | Quick electrical check of Cable1/Face3. No opens but there are shorts, in particular QETs shorted to chassis. |
| 1055 | Unplugged SQUETs from W and NW - can see short from QETs to chassis at the fridge. Unplug SQUET from SE - short disappears. Hmm. |
| 1115 | Plugged SQUET back into SE, short does not reappear. But when I plug ZC-70/SL43 into either W or NW, short appears (not as strong though, 10 MOhm). Hmm… |
| 1125 | Looks like SQUET ZC-70 has some shorts to chassis. Remove it from stripline to test on the bench.
Shorts not seen at the bench. Hmm. Stripline shorts?? |
| 1130 | Found a short from a SL-43 pin to chassis. But then I followed Cable 3 and saw it was still plugged into the HV diverter board and a DCRC. Unplugging the cable made the short disappear. |
| 1140 | Plug all SQUETs back in (not screwed in though). No QET short seen to chassis. |
| 1140 | Quick Cable 2 electrical check - all phonon stuff looks OK. LEDs look OK. |
| 1150 | Quick Cable 3 electrical check - at first Feedback A read too high. Loosening the SQUET/stripline connection slightly fixed this. After that all phonon stuff looks OK. |
| 1200 | Plug in accessory wires at SW/Face 4 |
| 1315 | Quick Cable 1 electrical check - at first some SQUETs and Feedbacks read too high, squeezing the SQUET/interposer/stripline connection fixed them. After that all phonon stuff looks OK. Also motor coils, endstops, Goldman thermometer look OK. Consulted accessory wiring table to locate these. |
| 1345 | Screw SQUID cards and FET cards to bottom of Tower |
| 1425 | Full electrical checkout of all 3 striplines at BOB - all good! everything connected, no shorts. (Skipped all charge-related connections.) |
| 1600 | Attach heatsinks to Tower 4K stage. One heatsink has broken off of the braided cable. Another one wouldn't fit between the two SQUETs next to each other - we'd have to take a SQUET off to get it in, so we didn't bother. |
| 1630 | Clean surface of IVC bottom, put new indium 1.5mm diam o-ring on it (with a very small amount of vacuum grease). Saw a scratch on bottom of IVC middle piece, tried to buff it out with ScotchBrite. |
| 1640 | Attach IVC bottom, start tightening screws. |
| 1705 | IVC screws are pretty tight.
Start gently pumping out IVC with Scroll Pump. |
| 1730 | IVC = 0.12 mbar, close enough. Switch to pumping IVC with Turbo Pump. |
| 1740 | Turbo on IVC = 0.4 ubar |