Bare-tether cathodic contact through thermoionic emission by low work-function materials

Chen, Xin and Sanmartín Losada, Juan Ramón (2012). Bare-tether cathodic contact through thermoionic emission by low work-function materials. "Physics of Plasmas", v. 19 ; p. 73508. ISSN 1070-664X.

Description

Title: Bare-tether cathodic contact through thermoionic emission by low work-function materials
Author/s:
  • Chen, Xin
  • Sanmartín Losada, Juan Ramón
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: 2012
ISSN: 1070-664X
Volume: 19
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A new material, C12A7 : electride, which might present a work function as low as 0.6 eV and moderately high temperature stability, was recently proposed as coating for floating bare tethers. Arising from heating under space operation, current is emitted by thermionic emission along a thus coated cathodic segment. A preliminary study on the space-charge-limited (SCL) double layer in front of the cathodic segment is presented using Langmuir’s SCL electron current between cylindrical electrodes and orbital-motion-limited ion-collection sheath. A detailed calculation of current and bias profiles along the entire tether length is carried out with ohmic effects and the transition from SCL to full Richardson-Dushman emission included. Analysis shows that in the simplest drag mode, under typical orbital and tether conditions, thermionic emission leads to a short cathodic section and may eliminate the need for an active cathodic device and its corresponding gas feed requirements and power subsystem, which results in a truly “propellant-less” tether system for such basic applications as de-orbiting low earth orbit satellites.

More information

Item ID: 21665
DC Identifier: http://oa.upm.es/21665/
OAI Identifier: oai:oa.upm.es:21665
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 21 Nov 2013 09:07
Last Modified: 01 Dec 2016 08:21
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