It would be left flat. Not tubular. So it would be a circle of 6” wide copper sheet I have a lot of scrap laying around. Mainly my question is does the element need to be round. ?My loop would be more like a tunnel I suppose. Instead of using tubular material I’m going to use flat metal. Wondering how wide would be too wide. I’m pretty much unlimited in the diameter I could make it. Was thinking about staying at 1m-1.5m diameter.?
Superlite