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2014/03/12

1530 Cleaned LN2 cold traps
1725 IVC pressure 1.6E-5 mbar. Isolate turbo pump and open valve to leak checker. Background helium leak rate 4.1E-9 mbar l/s. Commence nitrogen blow-out.
1825 Nitrogen blow out complete. Helium leak rate rose gradually to 7.6E-9 mbar l/s: no gross leak.
1930 Conduct electrical check at 77 K: no problems witnessed.
1955 Evacuate main bath. Background helium leak rate 1.3E-8 mbar l/s. Overpressurise main bath with He-4 gas. Helium leak rate unchanged: no gross leak confirmed.
2030 Fill IVC with 0.16 mbar He-4 exchange gas. Commence first helium transfer.