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Starting the next run

Scritto da Ryan Hunt on .

I adjusted a filter cloth being used as a backdrop that may have settled and limited the flow of air past one end of the cell.  I'm pretty sure that could have been an important source of sudden changes.  Even just as I stood there or worked around it I was seeing some interaction with the T_Mica.  I will have to be very careful, I guess.

I also added a short length of copper tube around the T_ambient sensor for a little more stability and averaging.  That should clean up the temp signal much better.

Then I vacuumed (to 1 torr) and loaded with .5 bar H2 for another run.  (Turns out Malachi makes it look a lot easier than it is to get the right pressures)  I set it to a power level that I think will be in the high loading range and near triggering. We will watch it there and then make adjustments based on how it behaves.

I was pleased to see that the impedance was down about 15.75 when it cooled off.  I do think that wire is nicely loaded.  We'll see if it wants more.

Keep watching.

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+2 #5 Lu 2012-11-17 18:06
Since the goal is replication of Celani, one difference is the amount of amperage currently going through the active wire--almost double what Celani used. One option, offered as a suggestion to consider, is to drop the amperage down to Celani's level (48A?) and run enough through the other wire to bring the overall temperature up to 250-350C. I think calibration will still be good but if we do activate the reaction then it will be very obvious anyway.
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0 #4 Ron B 2012-11-17 15:47
Has Celani produced a many of these wires or are there only a few in existence? Will it be possible for the HUG team to be able to produce them in the future? Has anyone coined a name for these wires? ie C-wire or c-biscuit lol

I see that this question has been asked/answered already.. I missed that earlier.
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0 #3 Ged 2012-11-17 06:28
I get the impression the glass temperature is less steady at this lower pressure (or for some other reason), but not completely sure.
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0 #2 David Roberson 2012-11-17 05:23
Is it possible for you to point the IR gun directly at each of the internal thermocouples? That might be a quick way to determine whether or not the glass and gas, etc. are modifying the readings due to IR absorption.

If you knew the temperature accurately at certain points that could serve as a calibration of first order.
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0 #1 Ecco 2012-11-16 23:53
Once reactor conditions at the current power level have stabilized (in 15-20 minutes?), I would try performing a manual temperature check with the IR probe on the wire, to see how is the temperature gradient this time with a starting pressure of 0.5 bar. I'm thinking that with lower gas pressures the difference between the low and the high temperature points might get higher, which I'm not sure would be a good thing.
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