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

Chen, Xin y 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.

Descripción

Título: Bare-tether cathodic contact through thermoionic emission by low work-function materials
Autor/es:
  • Chen, Xin
  • Sanmartín Losada, Juan Ramón
Tipo de Documento: Artículo
Título de Revista/Publicación: Physics of Plasmas
Fecha: 2012
Volumen: 19
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

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ID de Registro: 21665
Identificador DC: http://oa.upm.es/21665/
Identificador OAI: oai:oa.upm.es:21665
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 21 Nov 2013 09:07
Ultima Modificación: 01 Dic 2016 08:21
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