Electron cooling in probe collection from magnetized plasmas with anomalous transport

Charro, Mario y Sanmartín Losada, Juan Ramón (2002). Electron cooling in probe collection from magnetized plasmas with anomalous transport. "Plasma Physics and Controlled Fusion", v. 44 ; pp. 2285-2304. ISSN 0741-3335.

Descripción

Título: Electron cooling in probe collection from magnetized plasmas with anomalous transport
Autor/es:
  • Charro, Mario
  • Sanmartín Losada, Juan Ramón
Tipo de Documento: Artículo
Título de Revista/Publicación: Plasma Physics and Controlled Fusion
Fecha: 2002
Volumen: 44
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

The electron-retarding range of the current-voltage characteristic of a flat Langmuir probe perpendicular to a strong magnetic field in a fully ionized plasma is analysed allowing for anomalous (Bohm) cross-field transport and temperature changes in the collection process. With probe size and ion thermal gyroradius comparable, and smaller than the electron mean free path, there is an outer quasineutral region with ion viscosity determinant in allowing nonambipolar parallel and cross flow. A potential overshoot lying either at the base or inside the quasineutral region both makes ions follow Boltzmann's law at negative bias and extends the electron-retarding range to probe bias e(j)p ~ +2Too. Electron heating and cooling occur roughly at positive and negative bias, with a re-minimum around efa ~ - 2 7 ^ ; far from the probe heat conduction cools and heats electrons at and radially away from the probe axis, respectively. The potential overshoot with no thermal effects would reduce the electron current Ie, making the In Ie versus 4>p graph downwards-concave,but cooling further reduces Ie substantially, and may tilt the slope upwards past the temperature minimum. The domain of strict validity of our analysis is narrow in case of low ion mass (deuterium), breaking down with the ion Boltzmann law.

Más información

ID de Registro: 22437
Identificador DC: http://oa.upm.es/22437/
Identificador OAI: oai:oa.upm.es:22437
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 18 Feb 2014 07:42
Ultima Modificación: 21 Abr 2016 14:33
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