Abstract
Surface treatment processes for 304L and 316L stainless steel have been tested for the electron emission suppression over large area planar surfaces. Testing was performed on 17-cm-diameter electrodes with 3 to 4 mm gaps. The treatment processes for the electrodes were solvent cleaned 16 micro-inch rms surface machining, chemical polishing, hydrogen vacuum furnace firing, and gold coating. Tests were made with a 60 to 160 kV, 200 ns flat topped voltage pulse and 150 to 260 kV, 160-ns-FWHM, waveform with 1-cos(/spl omega/t) shape. Gap closure and cathode plasma area expansion rates are determined from a Child-Langmuir model. It was noted that the initial 1-/spl mu/m-roughness 304L SS gave similar or perhaps slightly better results than the other preparations. Results from each of the treatment processes are discussed.
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