2016/04/15 (Friday)

	Overnight: pumping IVC, both sides, with turbo pump
0900	IVC pumping pressure = 25 E-6mbar. Valve out pump, wait 5 min, IVC pressure = 1.2 E-3 mbar.
	IVC pressure somewhat higher than in Run 55, for whatever reason
1300	Turn on He4 Rotary Pump and pump out Main Bath. Leak checker is on and reads a background leak rate in the IVC of 5.4E-9 mbarL/s. Main bath has pumped below .5mbar. Flush with He gas.
1322	Conduct leak check while flushing the main bath with He. Leak rate started at 5.2E-9 mbarL/s and ended at 6.0E-9 mbarL/s, suggesting no serious leak.
1325	Pump out 1K Pot. Leak checker has since risen to 7.4E-9 mbarL/s before decreasing. No serious leak. Switch back to turbopumping IVC briefly before adding He exchange gas.
1335	Pump out line to He exchange gas. IVC pressure with turbo pump at 4.0E-5 mbar. Isolate turbo pump, and IVC pressure rises to 5.4E-4 mbar. Add 5.4 mbar He exchange gas to IVC.
1342	Commence LN2 transfer.
1345	MC (Cernox) = 298 K
1405	MC = 290 K
1430	MC = 260 K, IVC = 3.4 mbar

Soudan iT4 disassembly
1440	Removed detector stack from tower. Left the crown and bottom lid on the detector stack and kept the detectors together in the stack; so new tower has a spool but no crown. Stored tower and stack in purge cabinet.

1455	MC = 220 K, IVC = 3.0 mbar, level thermometer = 1.040 kΩ
1525	MC = 180 K, IVC = 2.2 mbar, level thermometer = 1.096 kΩ
1545	MC = 150 K, IVC = 2.2 mbar, level thermometer = 1.169 kΩ
1625	MC/Sorb = 115/170 K, IVC = 1.9 mbar, level thermometer = 1.261 kΩ
1700	MC/Sorb = 100/140 K, IVC = 1.6 mbar, level thermometer = 1.290 kΩ
1700	MC/Sorb = 95/130 K, IVC = 1.6 mbar, level thermometer = 1.301 kΩ
1840	Cease LN2 transfer. MC/Sorb = 81/121 K. IVC = 1.4 mbar. Level thermometer = 1.32 kΩ. Close enough. Detach hose, place ping pong ball at He recover port, and place bung on LN2 transfer tube. Main Bath isolated. Refill LN2 dewar in case we need it over the weekend.
2000	MC/Sorb = 78/124 K.