Electron cooling in probe collection from magnetized plasmas with anomalous transport

Charro, Mario and 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.

Description

Title: Electron cooling in probe collection from magnetized plasmas with anomalous transport
Author/s:
  • Charro, Mario
  • Sanmartín Losada, Juan Ramón
Item Type: Article
Título de Revista/Publicación: Plasma Physics and Controlled Fusion
Date: 2002
ISSN: 0741-3335
Volume: 44
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

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.

More information

Item ID: 22437
DC Identifier: http://oa.upm.es/22437/
OAI Identifier: oai:oa.upm.es:22437
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 18 Feb 2014 07:42
Last Modified: 21 Apr 2016 14:33
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