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The bent gun shoots both electrons and ions off to one side. Electrons have very little mass compared to ions, so the "trap" is actually a beam-straightener for electrons. The the ions, being much heavier, remain trapped while the electron beam is re-directed down the axis of the tube. It's analogous to winnowing wheat in the wind; the grain as it falls is much heavier than the chaff, so the grain is "trapped" while the chaff gets blown away.
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