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This article presents the investigation of millimetre wave extended interaction oscillation (EIO) using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. A W-band (75–110 GHz) pencil beam Extended Interaction Oscillator (EIO) was designed and constructed to operate for the first experiment with the output power of 38 W achieved from a four-gap PS discharge operating at 30.5 kV...
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