US Patent 7193369 Method for generating gas plasma

A method for generating a plasma. A gas flows along a flow path having the displacement identical to the lines of magnetic force of the main magnetic field, and high frequency alternating current is applied to the gas, thereby generating a gas plasma. For example, a gas is flowed through a pipe in a first direction. Electricity is conducted through the pipe in substantially the first direction. And a magnetic field is applied along a second direction (e.g., perpendicular to the first direction) to the gas flowing in the pipe such that a plasma is induced in the pipe.