The present invention is directed towards devices, systems and methods which produce electromagnetic waveforms including radio-frequency waves, microwaves and electromagnetic waves having no field current or electric field (magnetic waves) and subatomic and/or charge-less particles. In one embodiment, the system and method produces a “charge-less” propagating “magnetic” wave and/or charge-less particles and/or subatomic particles which have demonstrated high utility in the structural modification of both solids and liquids for materials processing. The energy generator according to one embodiment comprises a magnetron emitter hermetically sealed in a housing and supplied with a continuous dirty or erratic voltage signal to cause the magnetron emitter to operate erratically and unstably as a broad band signal generator whereby electromagnetic waves are produced in the hermetically sealed housing which facilitates and produces a plasma above the cathode of the magnetron emitter. The plasma preferably expands and contracts (oscillating) within the housing.