Analytical Approach For Investigation Of Hollow Cathode Orifice

Fabio Coccaro, Franco Bosi, Alexander Daykin-Iliopoulos, Igor O. Golosnoy, Steve B. Gabriel, Alessio Di Iorio
2018 Zenodo  
Prediction of hollow cathode orifice is one of the most important goals of a well performed design; engineers need simple design tools for a quantitative prediction of the orifice erosion. A recent work suggests the use of an analytical solution in contrast to two-dimensional numerical models, generally very hard to develop. In this work, a global model is coupled with an analytical orifice model. The orifice model solves a simplified quasi-one dimensional flow with the use of mass balance for
more » ... f mass balance for each species, diffusion drift equation in the radial direction and convection drift equation for ions in axial direction. The use of Dirichlet boundary conditions for plasma and neutral densities, extracted current and plasma potential allows for a full characterization of quantities involved in the erosion sputtering of the orifice wall. Comparison are given with experimental data and existing literature for neutralizer NSTAR at full power with extracted 3.26𝐴 and mass flow of 3.7×10^−7 𝑘𝑔/𝑠.
doi:10.5281/zenodo.1252988 fatcat:echrgsg4lnao3ej5qvmsyc7334