| | Reinstalled tower yesterday. Pumping out IVC overnight. |
| 0845 | Turbo = 120 nbar |
| 1030 | IVC = 2.2 ubar with pump valved out. This and pumping pressure are a lot higher than last time. |
| 1035 | Retighten bottom IVC screws |
| 1040 | Leak detector on IVC. Leak 58 pbarL/s with turbo pump still pumping on IVC. Leak 770 pbarL/s with turbo valved out. |
| 1050 | Retighten screws at middle IVC seal and at IVC/stripline tube seal |
| 1055 | Do squirt leak-checks at IVC seals and around pump manifold. Discovered that I left the green gas-inlet valve open at the manifold overnight, so we were pumping on the plastic tube to the wall. That explains our relatively poor IVC pressure and high background leak. Close this valve, start pumping IVC with turbo again. |
| 1100 | Turbo = 30 nbar (down from 120 this morning) |
| 1250 | Turbo = 19 nbar. Leak = 610 pbarL/s with turbo valved out. IVC = 300 nbar with turbo and LD valved out. |
| 1315 | Leak check IVC. Around top of stripline tube, strong blast causes 600→650 pbarL/s rise. No other leaks seen. |
| 1330 | Raise main bath |
| 1345 | Check pressure in 1K Pot: P2 = 28 mbar. Pump out with scroll pump. |
| 1400 | Pump out fridge lines on both sides with scroll pump |
| 1505 | Let mixture from 3He pump through cold LN2 Trap 2 into fridge lines, both sides. (Most mixture still in dump.)
Leak detector on IVC - no increase in signal (leak = 530 pbarL/s). |
| 1535 | Pump out main bath with scroll pump to <1 mbar on P2. |
| 1540 | Pressurize main bath with helium to 384 mbar above 1atm on G3. No noticeable increase in IVC leak, about 520 pbarL/s. |
| 1540 | Open 1K Pot speedivalve to pressurize it with helium also. |
| 1545 | Let 5.4 mbar He exchange gas into IVC |
| 1545 | MC(Cernox) = 297.2 K, Sorb = >249 K (max), IVC = 5.4 mbar, G1 (fridge) = 215 mbar, Level resistor = 0.985 kΩ. |
| 1550 | Begin LN2 transfer |
| 1555 | MC(Cernox) = 296.3 K, Sorb = >249 K (max), IVC = 5.4 mbar, G1 (fridge) = 214 mbar, Level resistor = 0.999 kΩ. |
| 1600 | MC(Cernox) = 295.3 K, Sorb = >249 K (max), IVC = 5.4 mbar, G1 (fridge) = 214 mbar, Level resistor = 1.027 kΩ. |
| 1610 | MC(Cernox) = 289.2 K, Sorb = >249 K (max), IVC = 4.6 mbar, G1 (fridge) = 214 mbar, Level resistor = 1.051 kΩ. |
| 1640 | MC(Cernox) = 256.8 K, Sorb = >249 K (max), IVC = 4.0 mbar, G1 (fridge) = 213 mbar, Level resistor = 1.118 kΩ. |
| 1650 | MC(Cernox) = 239.8 K, Sorb = >249 K (max), IVC = 3.4 mbar, G1 (fridge) = 211 mbar, Level resistor = 1.149 kΩ. |
| 1720 | MC(Cernox) = 194.1 K, Sorb = >249 K (max), IVC = 2.5 mbar, G1 (fridge) = 209 mbar, Level resistor = 1.258 kΩ. |
| 1730 | MC(Cernox) = 181.5 K, Sorb = >232.1 K, IVC = 2.2 mbar, G1 (fridge) = 209 mbar, Level resistor = 1.308 kΩ. |
| 1805 | Level resistor = 1.337 kΩ. Stop LN2 transfer. |