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| Paper IPM / P / 6739 |
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| Abstract: | |||||||
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Orbital motions of magnetized and relativistic electron beams in
free-electron lasers (FEL) with electromagnetic and magnetostatic
wiggler are considered. The orbit and dispersion curves of an
electromagnetic wiggler demonstrate the magnetoresonance when the
transverse motion of electrons in the wiggler field is treated
nonrelativistically. Magnetoresonance is also shown in the
nonrelativistic case of the magnetostatic wiggler. It is shown
that relativistic effects, due to the transverse motion of
electron in the wiggler field, destroy the magnetoresonance in an
electromagnetic wiggler and displace it in an electrostatic
wiggler. Magnetoresonance in the growth rate of FEL in the
nonrelativistic case and its destruction in the relativistic case
are shown
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