Low work-function thermionic emission and orbital-motion-limited ion collection at bare-tether cathodic contact

Chen, Xin and Sanmartín Losada, Juan Ramón (2015). Low work-function thermionic emission and orbital-motion-limited ion collection at bare-tether cathodic contact. "Physics of Plasmas", v. 22 (n. 5); p. 53504. ISSN 1070-664X. https://doi.org/10.1063/1.4919945.

Description

Title: Low work-function thermionic emission and orbital-motion-limited ion collection at bare-tether cathodic contact
Author/s:
  • Chen, Xin
  • Sanmartín Losada, Juan Ramón
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: 11 May 2015
Volume: 22
Subjects:
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Física Aplicada a las Ingenierías Aeronáutica y Naval
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

With a thin coating of low-work-function material, thermionic emission in the cathodic segment of bare tethers might be much greater than orbital-motion-limited (OML) ion collection current. The space charge of the emitted electrons decreases the electric field that accelerates them outwards, and could even reverse it for high enough emission, producing a potential hollow. In this work, at the conditions of high bias and relatively low emission that make the potential monotonic, an asymptotic analysis is carried out, extending the OML ion-collection analysis to investigate the probe response due to electrons emitted by the negatively biased cylindrical probe. At given emission, the space charge effect from emitted electrons increases with decreasing magnitude of negative probe bias. Although emitted electrons present negligible space charge far away from the probe, their effect cannot be neglected in the global analysis for the sheath structure and two thin layers in between sheath and the quasineutral region. The space-charge-limited condition is located. It is found that thermionic emission increases the range of probe radius for OML validity and is greatly more effective than ion collection for cathodic contact of tethers.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7262972BETSUniversidad Politécnica de MadridPropellantless deorbiting of space debris by bare electrodynamic tethers

More information

Item ID: 39212
DC Identifier: http://oa.upm.es/39212/
OAI Identifier: oai:oa.upm.es:39212
DOI: 10.1063/1.4919945
Official URL: http://scitation.aip.org/content/aip/journal/pop/22/5/10.1063/1.4919945
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 04 Feb 2016 14:01
Last Modified: 01 Dec 2016 08:15
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