Methods for pre-seasoning a component of a plasma reaction apparatus and method for fabricating plasma reaction apparatuses are provided. First and second end portions of the composite member extend into the first and second metallic tube members. The gas detector incorporates a first detection circuit corresponding to a first region of the gas and a second detection circuit corresponding to a second region of the gas. The head may include a bottom part mountable atop a plurality of pressurized containers, and a top part adapted to be received on the bottom part of the head so as to substantially enclose the nozzle. of the memory cell arrays of the second core section and at least a part of the memory cell arrays of the third core section are simultaneously activated.