We are still fitting the new flanges to the borosilicate tubes, which Mathieu found out the Pyrex borosilicate is still not the same glass Celani used. He is shopping for the Schott-Duran brand glass that Celani used in order to do the most accurate replication possible. The thought is that the glass will retain more heat and won't require as much power to get the test cells to the preferred operating temperature.
The risk is that if we have to put too much power into the wire to heat the cell to the required temperature we might overload the wire and it will burn out easier.
Tonight at midnight we will be done with the prescribed calibration plan for the control wire in the quartz tube. We are getting a nice, tight baseline calibration curve with about 1 to 2 watts of uncertainty, which will correlate to 2 - 4 degrees C roughly. If we see a temperature rise of more than 5 C we will be pretty certain we are seeing an effect. If we get 10 to 20 watts of power off the wire, we can expect roughly a 20 to 40C higher temperature. The graph below shows the confidence limits around the average temperature of the Mica as a function of the temperature.
Tonight, we took the the input power and the averaged values of the temperature rise and used zunzun.com to find a good equation to fit it. The results look like this.
Next, we'll use this formula to add a calculated field for power out as a function of T_rise on the live data display.
That means, we should be ready to load the Celani wire tomorrow, unless we think of something else that is worth doing first. The anticipation is thick here. So is the nervousness. We don't want to make any mistakes with the wire.
We are working feverishly to make the live data feed work well enough to share. As soon as it does, I will share it so everyone interested can watch the active wire (hopefully) generate excess heat.
Matt and Nicolas are working on the Euro Cell. The software is getting frustrating, but we pointed them at a java graphing program that should help them watch the data easier. We are putting together a shipment of parts like flanges for the new glass, some Isotan 44 wire, and a few other little parts.
Hey guys, be sure to get pictures and/or video of working together.
In other news, some key parts for a next generation test cell arrived today. More details on that as soon as I need a filler article.