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2011/02/26

1200 Stop flashing detectors.
Fill N2 cold trap Full.
1312 The temperature could not go lower than 70mK when the still heater is off. G1 and G2 ~50mbar and P1~0.05mbar. The still seemed too cold. Add 6mW to the still heater. Tower temperature starts to oscillate.
1515 Tower temperature 88 mK. Turn off Still.
1555 Try to optimise Still: 4 mW. Temperature starts to drop: reaches 78 mK. Pressure P1 = 0.09 mbar.
1405 Turn power of Still Heater down to 3 mW. Temperature starts to rise towards 79 mK, pressure P1 = 0.08 mbar.
Still temperature high at 1.2 K. Turn off Still heater and open valve 14 to allow more mixture out of dump into Still. P1 rises to 1.5 mbar.
1415 Close valve 14. Pressure P1 drops to 0.04 mbar. Tower temperature dropping; 78 mK at the moment.
2020 Tower temperature 71.4 mK. Plug in DCRC boards; temperature rises to 82 mK before returning to original value.
2300 Changed the firmwares two boards to the one sent by Sten recently with checksum FC33. And the charge baseline oscillation noise of DCRC33 was reduced.