Refinements to the MICHELLE Secondary Electron Emission model for simulating multi-stage depressed collector operation

The Secondary Electron Emission model in the MICHELLE code has undergone several refinements over the past year. MICHELLE, an advanced, three-dimensional electron beam design tool is currently under development by a team lead by SAIC under NRL/ONR sponsorship. As part of this new effort, an algorithmic representation of a comprehensive model of secondary emission is being developed for this computational tool in order to achieve an accurate beam collection design capability.