We study theoretically the spatial distribution of the THz emission from the wakes in a magnetized plasma and predict potential THz power yield in the range of several hundred watts. The generation of coherent radiation in the THz frequency range is one of the most challenging problems in modern technology. The potential applications of THz radiation include the imaging of biological and other materials, study and control of chemical reactions, and manipulations of quantum states in

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... rs. There are several THz sources available now [1] but the need for high power THz sources still exists. Recently, it was proposed to use plasma wakes to generate high intensity THz fields [2] . Typical plasma oscillations excited by a short laser pulse with intensity ∼ 10 17 W/cm 2 have electric fields ∼ 10 GV/cm and frequencies in the range of 1-10 THz. Unfortunately, plasma oscillations have zero group velocity and thus their energy cannot be coupled from the plasma. However, by applying a magnetic field one can allow the propagation of the plasma waves and subsequently their output from the plasma.