Since it's a volumetric projection, I assume it's self-regenerating. It can be broken, but if I had to guess, it likely draws off the same resources as the photonic armor system, so you have a lot to work with. Whether or not it can be broken and very quickly regen, or not get broken at all until its energy is sufficiently drained though, I've got no clue. That would be up to Wes I think.
I personally prefer having it break much earlier than its energy storage running out and regenerating really quick since it looks cooler.