Analysis of Secondary Electrons in a Plasma Direct Converter Simulator for Advanced Fusion

Orbits of charged particles, especially secondary electrons, in a magnetic field of cusp configuration were studied for the purpose of development of direct energy conversion for advanced fusion where separation of electrons and ions was significant. For analytical estimation, the Stormer potential was calculated, showing that ions could move wide region of magnetic field although electrons just aligned a magnetic field line, thus effective separation was expected. The calculated orbits were consistent with analytical estimation and experimental results. Within this restriction, secondary electrons cannot achieve ion collectors, but some disturbance such as space charge field can modify their orbit, and secondary electrons have a possibility to reach ion collectors. Orbits of secondary electrons starting at electron collector support this consideration