Abstract

Auxiliary electrons can be successfully used as a diagnostic probe to deduce characteristics and dynamics of magnetically confined plasmas typical of Electron Cyclotron Resonance and Microwave Discharge Ion Sources, as well as to improve their performances and/or stability. To this scope, numerical simulations are a powerful tool to predict the effect of the interaction of an electron beam with the plasma: this paper presents an alternative way to deduce the plasma density by joining the results of numerical simulations with the diagnostic of the beam transmitted through the plasma. As will be shown, the applied numerical code is able to describe the dynamics of an electron beam, generated by an e-gun, propagating inside a plasma trap, with a magnetic configuration typical of microwave discharge ion sources, focusing on several effects such as ionizations, heating, space charge etc. The role played by the position of the e-guns with respect to the magnetic field profile will be also underlined.

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