5th INTERNATIONAL CONFERENCE ON THE FRONTIERS OF PLASMA PHYSICS AND TECHNOLOGY

18-22 April 2011, Singapore, Republic of Singapore


ELECTRON DYNAMICS IN PRESENCE OF STATIC HELICAL MAGNET INSIDE CIRCULAR WAVEGUIDE

B. F. Mohamed, A. M. Gouda and L. Z. Ismail 1

Plasma Physics Dept., N.R.C., Atomic Energy Authority, Cairo, Egypt
1 Physics Dept., Faculty of Science, Cairo University, Cairo, Egypt


Abstract.  In recent years, a number of studies have been dedicated to the dynamics of electrons in electromagnetic fields depending on the basis of the Newton equation with the Lorentz force. This subject has a great interest due to its diverse applications to particle acceleration in the field of nuclear physics, thermonuclear fusion research and high energy particle physics.

Also another mean for coupling electromagnetic energy to particle has discussed as a possible origin of cosmic rays. The same mechanism has been proposed for the most of the investigations including the direct acceleration scheme make use of short-pulse high- intensity lasers. However, some of the researchers have made theoretical as well experimental attempts for the particle acceleration by using microwave radiation. The description of the electron dynamics in a high frequency field is complicated because of the large number of oscillations. The problem becomes more intricate analytically with the addition of an extra- electric or magnetic field.

The dynamics of an electron in the fields associated with TE-electromagnetic wave propagating inside a circular waveguide is analytically studied. The motion of this electron along the axis of the waveguide is investigated in the existence of a helical magnet (in which the field is perpendicular to the axis of waveguide and rotating as a function of position along the magnet). It is shown that it can be accelerated due to its interaction with polarized fields of microwave radiation propagating along the waveguide. The fields for the lowest order TE11-modes and the deflection angle of electron trajectory, due to these fields, are obtained. Also, An expression of the acceleration gradient of the electron and its energy gain are evaluated for different intensities and frequencies of the microwave.