A Microscopic First-principle Model for Electron Cyclotron Emission Reabsorption and Evidence of Loss of Confinement above a Critical Density in Magnetized Plasmas

The existence of electron ordered gyrational Larmor motion is at the basis of magnetic plasma confinement. It is well known that accelerated electrons will emit cyclotron radiation as described by basic electrodynamics. A non-relativistic electron population, at density ne, temperature Te in magnetic field with an intensity B, would emit a radiated power Pe=e4/(3...me3c3)B2neTe, which under fusion reactor condition would be very large (>1MW/m3) [1]. However, this is not the power radiated from the plasma as this is found to be optically thick, particularly at the fundamental harmonic, ...c=eB/me. To our knowledge, no definite microscopic explanation for radiation re-absorption in magnetized plasma has been given in the literature. Here we propose a first-principle model, in which the plasma is conceived as a system of point electrons obeying Newton equations, in a constant magnetic field within a neutralizing background. The model is an extended and modified version of a classical many-body model of matter-radiation interaction already proposed in [2].