Relaxation of an ion beam moving transverse a magnetic field in a plasma

A nonlinear stage in development of instabilities appearing in interaction of a primary monoenergetic ion beam with a plasma in a magnetic field is considered. Energy losses in the directional motion of the ion beam during its relaxation in the plasma and the enhancement of the thermal energy of plasma particles have been found. It is shown that the excitation of electron-cyclotron oscillations results in a transfer of approximately 2/3 of the energy of the beam directional motion to plasma electrons and in substantial heating of the electron component. In the excitation of ion-acoustic oscillations this energy converts largely to the energy of the transverse thermal motion of plasma ions