The breathing correlates with T_Mica very well. Isn't this the temperature of the wire? If so, then it's actually power that is oscillating. I was thinking it might be something in the room environment.
Craig On 12/12/2012 09:49 PM, Akira Shirakawa wrote: > On 2012-12-13 03:29, Craig wrote: >> This is so strange. I set the data in View Test Celani Cell #2, found >> here: >> >> http://data.hugnetlab.com/ >> >> to view back 4 hours. Then I selected only P_Xs Low. Notice that the >> excess power is oscillating between 4 watts and 8 watts, in a very >> precise rhythm, with each wave appearing to have the same shape, and >> with each wave lasting about an hour. I also see that the wave appears >> to be tapering with the lows becoming higher and the heights become >> lower. There also seems to be a correlation with T_Ambient, but why? > > Whatever this is, it didn't happen with the previous overnight run > with power applied to the inert wire (and the active wire partially > loaded, in hydrogen atmosphere). This is a user-submitted image from > the MFMP blog showing it: > > http://i.imgur.com/bB383.png > (note that "Power (Red)" actually shows W instead of bar) > > From 2012-12-12 00:00 to about 10:00, external glass temperature > (under 50W of indirect heating) didn't seem to fluctuate very much > with ambient temperature. However with direct heating (48W) it does > quite much. > > The main difference between those two runs is that the one with > indirect heating had a starting hydrogen pressure of 2 bar (which > increase with heat, of course), while the latter ones started at 1 > bar, probably offering less thermal inertia (but still not explaining > how glass temperature variations can be larger than ambient ones, > assuming that these are the ones which drive them). > > Cheers, > S.A. >
