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Twisted waves in a magnetized plasma

We study twisted wave solutions in a magnetized plasma and provide a wave-kinetic description of an arbitrary spectrum of twisted wave turbulence. We first consider the paraxial equation describing a wave beam propagating along an arbitrary direction with respect to the static magnetic field. We then discuss the properties of the appropriate twisted wave solutions, and establish the corresponding wave-kinetic description of twisted plasma turbulence, valid in quite general conditions. Finally, we consider an example of application, where two twisted modes with different topological charge interact with each other and exchange energy and angular momentum inside the plasma.