A method and system are disclosed for performing seismic surveys using a seismic vibrator, which generates a sweep signal with enhanced low frequency content by generating a combination of a linear and nonlinear sweep and wherein the nonlinear sweep snonl as a function of time is calculated by a predetermined algorithm. The conditioner includes an ion generator that has an electrode assembly including a first array of emitter electrodes, a second array of collector electrodes, and a high voltage generator. In one embodiment the loosened spatter may then be carried away from the torch by either or both of positive or negative fluid pressure, for example an air blast or a vacuum line, respectively.