Electromagnetic Radiation from a Strong DC Electric Field

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Computer simulations of electrons accelerated by a strong DC electric field show not only very efficient generation of beam waves but also emission of o-mode radiation. We present a set of particle simulations for which we study the behavior of wave generation under varying conditions. We determine that the o-mode arises from a combination of beam waves and of z-mode waves that are themselves generated by beam waves. We estimate how these interactions depend on beam density