A coaxial-type accelerating system with amorphous material

In order to accelerate low-energy protons and heavy ions, a wide accelerating frequency range is necessary. Such applications of accelerating structures with an amorphous cores loaded cavity have been studied by several laboratories. A method of computation of the impedance of a coaxial cavity loaded with amorphous toroidal cores is described. It is shown what dominant role is played by the skin-effect in a core with a foliated structure. As a result of an analysis of the electric and magnetic field distribution, the cavity impedance is computed. The impedance depends on capacity and magnetic permeability, having real and imaginary parts. These depend on frequency, the sheet thickness, conductivity, and on the permeability of the material at zero frequency. It is important that this impedance can be stabilized in some frequency range. Applications of accelerating systems of this type are discussed in different cases