couple of weeks without updates on the system, but full of news.
COOLDOWN: another cooldown has been made to test the completely automated system of LN transfer in the cryostat, with the new time relay added (you can find the input parameters details at http://teotihuacan.physics.umass.edu/pocarlab/logbook/daily_log/viewposts.php?log=posts_lxe) and the system wrapped in the superinsulation, about 1/4 of the dewar lasted little less than three days. The overall gradient in the chamber was about 31 degree (plots).
XENON LOAD: Xenon has been finally loaded in bottle 1, than cryopumped in bottle 2 (everything is documented starting from http://teotihuacan.physics.umass.edu/pocarlab/logbook/daily_log/viewposts.php?log=posts_lxe and following days, with howto and monitoring parameters). The two plots on the bottom are referred to the Xe load from the dewar to bottle 1, while the top ones are the 1 to 2 bottle ping-pong (with relative formation of ice plug in the regulator, the flow drops suddenly to zero). Looking the plots of the flow in the statistics pad, there is the value integral in both occasion. This value is the integral of the flow in time, which is related to the mass of the Xe transferred in this way:
M_Xe[g]=Integral*1.32*5.89/120
the masses measured are 4435g and 4453g, knowing that in the bottle there were around 5kg (at most) of Xe, we can conclude that we have an accuracy in measuring the mass through the flowmeter ~<10%.
Once the Xe has been loaded in the system, also the 148Gd has been filled with 1.9 abs bar of Xe and pinched off from the system
