Abstract
Empirical electron-beam characterization by molecular beam probing has been applied to the interaction space of a gridded Injected Beam Crossed-Field Amplifier (IBCFA) and a nongridded M-Backward Wave Oscillator. A small gas stream, preferably helium or argon, is injected through a capillary into the electron beam. The interaction of the gas molecules with electrons in the beam results in the release of far ultraviolet photons which are collected and counted as a function of position by means of a solar blind, photon detector. The spatial resolution is as small as 15 × 15 × 15 µm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . Application of this technique to the beam injection in IBCFA's is presented, and applications to TWT's, gyrotrons, and cathode emission studies are discussed.
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