2018/03/13 (Tuesday)
| Status: warming. Main bath empty. LN2 traps pumped out, mixture in dump. 1K Pot evacuated and isolated. Cryostat vacuum jacket pumping overnight. | |
| 0955 | Turbo (on cryostat vacuum jacket) = 30 nbar, cryostat vacuum jacket = 300 nbar with pump valved out. |
| 0955 | MC(Cernox) = 280 K |
| 1105 | Finish lowering main bath and deinstalling tower |
| need to investigate the 77K short from DIB2 qI FET gate to chassis. | |
| 1130 | Disassembling tower. Examine ST-3-10 from DIB2, and also Tower Face 4. Take off cover plates to see how Wire 15 is seated in its trench, push on it some with the black plastic tool to check the tension. No discernible difference between Wire 15 and other wires. Tower wires seem to have more tension than side coax wires. |
| 1153 | Unscrew spool bottom and rotate spool and detector to align DIB1 with tower facce 6 and DIB2 with tower face 3. |
| 1200 | Install Side Coax ST-3-3 / ST-3-8 on DIBs 1 / 2 |
| 1205 | Tower electrical checkout: |
| Detector | USD1 | DIB | 1 | |
|---|---|---|---|---|
| side coax | ST-3-3 | date/who: | 2018-03-13/NM&MF | |
| face | 6 | |||
| + lead | -lead | signal | typical | measured |
| 9 | chassis | LED1 Rforward | 8 to 9 MΩ | 780kΩ |
| 9 | chassis | LED1 Vforward | 1.0 to 1.1 V | 1.107V |
| chassis | 9 | LED1 Rreverse | <1 nS | <1 nS |
| 10 | chassis | LED2 Rforward | 8 to 9 MΩ | 781kΩ |
| 10 | chassis | LED2 Vforward | 1.0 to 1.1 V | 1.107V |
| chassis | 10 | LED2 Rreverse | <1 nS | <1 nS |
| 11 | 7 | Qo Rbias | 24 to 26 nS | 25 nS |
| 11 | 12 | Qo C coupling | <1 nS | <0.3 nS |
| 13 | 12 | Qo Rfeedback | 24 to 26 nS | 25 nS |
| 14 | 7 | Qi Rbias | 24 to 26 nS | 25 nS |
| 14 | 15 | Qi C coupling | <1 nS | <1 nS |
| 16 | 15 | Qi Rfeedback | 24 to 26 nS | 25 nS |
| 1-8, 11-16 | chassis | Chassis shorts | <1 nS | <1nS |
| Detector | USD1 | DIB | 2 | |
|---|---|---|---|---|
| side coax | ST-3-8 | date/who: | 2018-03-13 / MF&NM | |
| face | 3 | |||
| + lead | -lead | signal | typical | measured |
| 9 | chassis | LED1 Rforward | 8 to 9 MΩ | 760kΩ |
| 9 | chassis | LED1 Vforward | 1.0 to 1.1 V | 1.11V |
| chassis | 9 | LED1 Rreverse | <1 nS | 1.5 nS |
| 10 | chassis | LED2 Rforward | 8 to 9 MΩ | 780kΩ |
| 10 | chassis | LED2 Vforward | 1.0 to 1.1 V | 1.11V |
| chassis | 10 | LED2 Rreverse | <1 nS | <0.5nS |
| 11 | DIB1-7 | Qo Rbias | 24 to 26 nS | 25 nS |
| 11 | 12 | Qo C coupling | <1 nS | <.2nS |
| 13 | 12 | Qo Rfeedback | 24 to 26 nS | 25 nS |
| 14 | DIB1-7 | Qi Rbias | 24 to 26 nS | 25 nS |
| 14 | 15 | Qi C coupling | <1 nS | <1 nS |
| 16 | 15 | Qi Rfeedback | 24 to 26 nS | 25 nS |
| 1-8, 11-16 | chassis | Chassis shorts | <1 nS | <1nS |
| 1220 | Finish tower reassembly. Move tower from clean room to fridge clean tent. |
|---|---|
| 1310 | Begin installing tower |
| 1340 | Check pressure in 4He cold trap: 2.0 mbar. Pump out with scroll pump. |
| 1340 | Check pressure in fridge: Condenser = 2.5 mbar, Still = 2.3 mbar. Pump out with scroll pump. |
| 1420 | SQUET attached on DIB2. Electrical check: looks good. |
| 1435 | SQUET attached on DIB1. Electrical check: looks good. |
| 1440 | Check pressure in warm LN2 Cold Trap 1 (the one we used during the run): 11.2 mbar. Pump out with scroll pump. |
| 1445 | Check pressure in warm LN2 Cold Trap 2: 7.0 mbar. Pump out with scroll pump. |
| 1505 | IVC closed and mostly tightened. Start pumping gently on IVC with scroll pump |
| 1530 | Switch to pumping IVC with turbo pump |
| 1535 | Fill LN2 cold trap bath |
| 1540 | Start cryocleaning mixture through Cold Trap 2, V6 = 12.4% |
| 1555 | Increase V6 to 12.7% to reestablish flow |
| 1605 | Increase V6 to 12.8% to speed up flow |
| 1620 | Leak check IVC. Some leaks found in the plumbing at the top of the fridge behind the Ebox. A number of KF clamps were somewhat loose - tightened these, then saw no leaks. LD background 180 pbarL/s. |
| 1555 | Increase V6 to 13.0% to reestablish flow |
| 1650 | Stop cryocleaning. Pump mixture back to dump. |
| 1700 | Retighten IVC screws |
| 1710 | Raise main bath |
| 1720 | Open mixture to LN2 Trap 1 through V9 and V13a to let it chill overnight |