Volume charge influence on capture of electron bunches by a wave in the multibeam autophase TWT

On the basis of the analytical non-linear theory of the autophase multibeam TWT the calculation is carried out for the influence of volume charge on stability of electronic bunches capture in all rays of the instrument. The received adiabatic and nonadiabatic stability conditions of oscillators packets have allowed to show that the registration of a volume charge leads to appearance of the lower bound of traveling wave amplitude in SWS above which there is a capture of packets of oscillators in all rays of multibeam autophase TWT.