A preliminary numerical model has been developed as a first step toward the definition of a self-consistent code for both single-channel (ScHc) and multi-channel (McHc) hollow cathodes. The code will be used as a tool for the design process of high-current cathodes for electric propulsion. As first attempt, a time-independent 1D code was developed to simulate the neutral gas and the plasma properties along the cathode without requiring experimental data as an input. A system of conservation laws for electrons and ions is solved numerically whereas the neutral gas velocity and pressure are taken from a separate simulation, assuming the independence of these quantities of the dynamics of the plasma. Results from the preliminary model are encouraging since some characteristic features of such type of cathodes are properly reproduced. Future development will regard the addition of a time-averaged erosion/deposition model, the study of the effect of an external magnetic field and, possibly, the extension to two dimensions.
Numerical Model for 100-kW Class Hollow Cathodes, Part II
PAGANUCCI, FABRIZIO;ANDRENUCCI, MARIANO
2010-01-01
Abstract
A preliminary numerical model has been developed as a first step toward the definition of a self-consistent code for both single-channel (ScHc) and multi-channel (McHc) hollow cathodes. The code will be used as a tool for the design process of high-current cathodes for electric propulsion. As first attempt, a time-independent 1D code was developed to simulate the neutral gas and the plasma properties along the cathode without requiring experimental data as an input. A system of conservation laws for electrons and ions is solved numerically whereas the neutral gas velocity and pressure are taken from a separate simulation, assuming the independence of these quantities of the dynamics of the plasma. Results from the preliminary model are encouraging since some characteristic features of such type of cathodes are properly reproduced. Future development will regard the addition of a time-averaged erosion/deposition model, the study of the effect of an external magnetic field and, possibly, the extension to two dimensions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
