Application of linear magnetic loss model of ferrite to induction cavity simulation

摘要

A linear, frequency independent model of the rf properties of unbiased, soft ferrite has been implemented in finite-difference, time-domain, electromagnetic simulation code AMOS for the purposes of studying linac induction cavities. The simple model consists of adding a magnetic conductivity term ((sigma)(sub m)H) to Faraday's Law. The value of (sigma)(sub m) that is appropriate for a given ferrite at a particular frequency is obtained via an rf reflection experiment on a very thin ferrite toroid in a shorted coaxial line. It was found that in the frequency range 100 to 1000 MHz, the required value of (sigma)(sub m) varies only slightly (