Efficiency Scaling Law for the Two-stream Amplifier
نویسنده
چکیده
The mechanism of conversion from the kinetic energy of electron beams to electromagnetic wave energy is investigated in the two-stream amplifier. It is shown that the optimal efficiency of the amplifier scales according to AV/V for relativistic electron beams and (AV/V) 2 for nonrelativistic electron beams, where AV is the axial velocity difference in the two beams and V is the mean axial beam velocity. This scaling law not only explains intrinsically low efficiencies ( 5%) observed in numerous nonrelativistic two-stream amplifier experiments but also predicts that the optimal efficiency of a relativistic two-stream amplifier is typically greater than that of a nonrelativistic two-stream amplifier by one order of magnitude. PACS numbers: 41.60.Cr, 41.75.Ht, 52.75.Ms, 52.25.Wz
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تاریخ انتشار 2014