CaltechAUTHORS
  A Caltech Library Service

Determination of the work function distribution of a LaB_6 hollow cathode based on plasma potential measurement and 2D plasma numerical simulation

Guerrero, Pablo and Mikellides, Ioannis G. and Polk, James E. and Meiron, Daniel I. and Lobbia, Robert B. (2018) Determination of the work function distribution of a LaB_6 hollow cathode based on plasma potential measurement and 2D plasma numerical simulation. In: 2018 Joint Propulsion Conference. AIAA , Reston, VA, Art. No. 2018-4511. ISBN 9781624105708. https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838581

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838581

Abstract

Self-heating hollow cathodes are central components in modern electric thrusters. The plasma discharge inside these devices heats the internal components, thus maintaining the temperatures required for electron emission. Precise knowledge of the physical phenomena governing hollow cathode operation is key to predict their lifetime, specifically, their thermionic emission characteristics. A simulation platform has been built to couple plasma and thermal models of the self-heating hollow cathode to produce a self-consistent solution. A self-consistent solution has been found for a LaB_6 hollow cathode operating at 25A and 13 sccm where the work function is assumed to be spatially uniform along the emitter with a value which is allowed to vary as the coupled model iterates to a self-consistent solution. The emitter temperature from the converged solution does not agree with experimental temperature measurements, however. The results of a sensitivity analysis suggest that none of the tolerances in the measurement are responsible for the discrepancy. We hypothesize that either the work function needs to be a function of position along the emitting surfaces or the heat fluxes have been overestimated in the plasma solver.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2018-4511DOIUNSPECIFIED
ORCID:
AuthorORCID
Meiron, Daniel I.0000-0003-0397-3775
Alternate Title:Determination of the work function distribution of a LaB6 hollow cathode based on plasma potential measurement and 2D plasma numerical simulation
Additional Information:© 2018 American Institute of Aeronautics and Astronautics.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2018-4511
Record Number:CaltechAUTHORS:20190805-134838581
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838581
Official Citation:Determination of the work function distribution of a LaB6 hollow cathode based on plasma potential measurement and 2D plasma numerical simulation. Pablo Guerrero, James E. Polk, Robert B. Lobbia, and Ioannis G. Mikellides 2018 Joint Propulsion Conference. https://doi.org/10.2514/6.2018-4511
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97654
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Aug 2019 23:10
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page