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Scalloped beam amplification occurs when an rf signal propagates along an electron beam of periodically varying diameter whose scallop wavelength is adjusted to be one-half the effective plasma wavelength in the beam. The dependence of this gain mechanism on frequency, magnetic field, voltage, and current has been investigated experimentally, and over two db gain per scallop has been measured. In the particular setup used, positive ion oscillations caused smearing of true scalloped beam amplification effects.
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T.G. Mihran (1956) studied this question.
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