I'm talking about this:
Basically, it's another trope from the futuristic tech index, plasma rifles are often designed as having tuning fork like barrels, but I also want to add an extra layer to the plasma weapons.
Plasma rifles in my world work by utilizing nanotechnology, and highly advanced data processing units.
Before the plasma is being shot at something, the weapon creates multiple thin, light layers of a reflective material, forming a dielectric mirror for the spheromak plasma, so the heat will not escape by either collision or thermal radiation.
After that, the plasma is created and accelerated down the barrel, the dielectric mirror wraps around it, and it exits the weapon, ready to melt the face off from the heretics.
What could be a justification for the design choices of a weapon that operates in this way?