Measurements with an emissive probe in the CASTOR tokamak

Roman Schrittwieser, Jirí Adámek, Petru Balan, Martin Hron, Codrina Ionita, Karel Jakubka, Ladislav Kryska, Emilio Martines, Jan Stöckel, Milan Tichy, Guido Van Oost

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Abstract

An emissive probe has been used in the edge region of the CASTOR tokamak in order to test the possibility of direct measurements of the plasma potential. The difference between the floating potential of a cold probe and that of an emissive probe has been found to be approximately 1.3 times the electron temperature, which is less than predicted by the probe theory. Several possible reasons to explain this discrepancy are offered, such as secondary electron emission, uncertainties in the ion temperature, different collecting areas for electrons and ions, etc. The possible impact of a space charge formed by the emitted electrons is also discussed.
Original languageEnglish
Pages (from-to)567 - 578
Number of pages12
JournalPlasma Physics and Controlled Fusion
Volume44
Issue number5
DOIs
Publication statusPublished - May 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Schrittwieser, R., Adámek, J., Balan, P., Hron, M., Ionita, C., Jakubka, K., ... Van Oost, G. (2002). Measurements with an emissive probe in the CASTOR tokamak. Plasma Physics and Controlled Fusion, 44(5), 567 - 578. https://doi.org/10.1088/0741-3335/44/5/305