Yet another one of my cutting devices, this time though using the hot fire from LO2, rather than plasma (though when first ignited, LO2 does make some plasma).
Interesting... With some modification and a little touching up, this is a viable torch... Try using GPMP or whatever it's called to create a gravity field, concentrating the plasma.
Turns out mine focused into a tight stream by the configuration of VENT objects and the shape of my nozzle, and in fact looks like a beam made of fire. Besides pressure is more realistic when working with gasses, so I tried to do it that way, and for me I think my result is what I was looking for.