basically any time i have an arc, i have electrons flowing in the opposite direction to the field gradient. so when the electrons reach the other side, they will be stopped, which will then produce an EM wave. In, class, my professor drew the direction of radiation in a particular direction, but the electrons deccelarating should produce a wave radially in all directions shouldn't it? with the max amplitude being in the plane normal to the velocity? ie, the charge carrier's direction of travel? so why would it the bremsstrahlung process emit radiation in only one particular direction?