Some years ago I used some Rogowski coils but I had a problem because the PTFE coating were burned in very few tests. Now the input power is 5 times greater so the problem must be worse. What kind of coating could I use?
There are some ceramic coatings. See http://www.zircotec.com Some are paint on but the better ones are plasma coated. In some configurations you can screen the coil from the plasma with a slotted metal screen. The slot can be very thin but must be in the toroidal direction to permit the magnetic field to penetrate; i.e. the plasma return current flows in the screen.
I used before machinable ceramics (macor) but it was broken in lots of parts after only two shots.
Why do you recommend that the slotted metal screen must be in the toroidal direction? is not better to set them perpendicular to avoid eddy currents?
Thank you Anthony.
I will try Nural 27 to join the metal sheets, I will have a lot of work.
We use a boron nitride coating over a probe in the edge of our tokamak plasma. In the probe region, we estimate our plasams are around 20eV for up to 10ms at most. Not sure how much power you're putting in, but BN will definitely do better than PTFE. Plus the low-Z should be less harmful for your plasmas if it does sputter or ablate.
The power is about 5-10 kilojoule and temperature 150eV.
I looked for boron nitride, it came as spray or powder
It is possible to dissolve boron nitride in water and use it as a glue?
( metal sheets must be more strong )
A friend told me that he used kaolin and water mixture to glue high temperature oven parts.
Recently I used high temperature epoxi Nural-27 at about 10mm of the targets
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