Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Measurements of plasma properties using the floating potential of emissive Langmuir probes
Year:2013
Research Areas
  • Phisics
Information
Abstract
The measurement of the plasma potential of unmagnetized Maxwellian plasmas by using the floating potential of emissive Langmuir probes is discussed. The temperature of the probe was monitored in order to estimate the emitted thermoionic electron current and to determine the limits of the strong electron emission regime. Under these ideal conditions, the measurements of the plasma potential of the emissive probe are cross checked against those of collecting Langmuir probes. In agreement with previous works, the current voltage curves of emissive probes show the temperature dependent electron saturation currents. An empirical expression is suggested for the dependence of this saturation current with the probe temperature which recovers the response of collecting probes when the probe is cold. The experimental data indicate that the floating potential of the emissive probe is close to the local plasma potential only when the emitted thermoionic electron current is similar to the electron saturation current. Larger electron emission currents lead to small increments the floating potential over the local plasma potential. Our results suggest that the electron saturation current of a hot emissive probe is composed by the thermal electrons from the plasma and a returned fraction of the thermoionic emitted electrons.
International
Si
JCR
Si
Title
Contributions to Plasma Physics
ISBN
0863-1042
Impact factor JCR
1,108
Impact info
Datos JCR del año 2011
Volume
53
10.1002/ctpp.201310003
Journal number
From page
16
To page
21
Month
SIN MES
Ranking
Participants
  • Autor: Sandra Pilar Tierno Gomez (UPM)
  • Autor: Elena Roibas Millan (UPM)
  • Autor: Juan Luis Domenech Garret (UPM)
  • Autor: Jose Manuel Donoso Vargas (UPM)
  • Autor: Luis Conde Lopez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Investigación en Fusión Inercial y Física de Plasmas
  • Departamento: Física Aplicada a la Ingeniería Aeronáutica
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)