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Starting the next run

Written by 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 #10 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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+1 #9 Al Potenza 2012-11-17 17:46
@Ron B

I also was curious if the Celani wires can be produced locally and in larger quantities. If that question was answered, I missed the reply and I'd appreciate a repeat.

I am also curious, as someone else was, whether Celani and his demonstration device can be brought to the lab so his work can be exactly verified but with the better instrumentation and data presentation that the current system has.
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0 #8 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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+5 #7 Robert Greenyer 2012-11-17 13:50
I like the change documentation Idea - we should probably do it as an open google doc so everyone can see it at all times.
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0 #6 Ivone M. FitzGerald 2012-11-17 13:10
I second Pierre. A scientific paper must be constructed out of the current experimentation s and changes in method currently engaged in. So everything, even the smallest thing, must be written down (Easier said then done, I know!). The resulting paper must be pseudo sceptic proof.
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+1 #5 Pierre 2012-11-17 12:18
May I suggest that some one gets appointed "change manager" and that he or she keeps a detailed (public?) log of every minor or major, planned or unplanned change that takes place.
It could be crucial in explaining unexpected behavior or reconstructing a previous state
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0 #4 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 #3 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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+4 #2 Al Potenza 2012-11-17 02:05
If a backdrop cloth can be an "important source of sudden changes", you have serious problems with the design of the apparatus.

I'd encourage eventual change to some formal method of calorimetry in which the output signals depend mainly and almost exclusively on the power generated within the cell. I know calorimetry is more expensive and difficult but if the excess power you are looking for is a subtle amount, then it will be necessary. Of course if you'll settle for the ability to detect only a very large effect (say 50 -100% excess power and energy) then I suppose the current system may serve.
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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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