Hi all, I am currently working to build a Joule Heater that will be used to heat samples to upwards of 1000*C in seconds in vacuum. While the temperature and speed is definitely there, the contacts are always non-uniform -- making the data hardly repeatable. I am using a ~70mmx10mm Silicon wafer that is clamped on either side by 2 contacts. My problem is that on either side there is a "hotspot" where the contact is the best, all of the current flows through these two hot spots. There is 2 problems with this -1- it limits the temperature I can reach because the temperature at the "hotspots" is much much higher than the temperature of the center of the wafer. -2- it extremely prohibits repeatably, which is key. I have tried stainless steel contacts as well as tantalum contacts, both rough and polished. I have tried several different clamping techniques as well. No matter what I try, there is always a point of "best contact" -- which makes me wonder, is uniform contact even possible (at least with the funds I have available)?