High accelerating-gradient accelerator based on magnetic field decay mechanism

The author proposes a novel concept for an accelerating device, where the magnetic field energy is efficiently stored in a specially prepared material by a continuous electric current. If the current drops abruptly to zero, the magnetic field stored inside the material decays, thereby generating an accelerating electric field. A high-current electron beam with relatively low energy propagates through a hole along the axis of a cylindrical field-storage device, sustaining an azimuthal magnetic field in the field-storage material. A theory of the magnetic field diffusion is developed in order to estimate the accelerating gradient whenever the sustaining electric current drops to zero. According to a theoretical calculation, a high-accelerating electric field occurs at the axis, which can be a substantial fraction of a megavolt per centimeter for optimized values of the magnetic permeability and conductivity of the field-storage material.<>