Results of direct measurements of the plasma potential using a laser-heated emissive probe

R. Schrittwieser, A. Sarma, G. Amarandei, C. Ionita, T. Klinger, O. Grulke, A. Vogelsang, T. Windisch

Research output: Contribution to journalConference articlepeer-review

Abstract

Reliable diagnostics of the plasma potential is one of the most important challenges in context with the production, control and confinement of a plasma. Emissive probes are readily available as direct diagnostic tools for the plasma potential with a good temporal and spatial resolution in many plasmas, even up to middle-sized fusion experiments. We present the results of investigations on the heating of lanthanum hexaboride and graphite with an infrared diode laser and on the development of a laser-heated emissive probe. Such a probe has a higher electron emission, much longer life time and better time response than a conventional emissive wire probe. We have observed that from both materials electron emission current can be achieved sufficiently strongly even for dense laboratory and experimental fusion plasmas.

Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalPhysica Scripta T
VolumeT123
DOIs
Publication statusPublished - 2006
Externally publishedYes
Event5th International Workshop and Summer School on Plasma Physics - Kudowa Zdroj, Poland
Duration: 6 Jun 200510 Jun 2005

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