2004/10/22 by Ramin Madani, R. Madani, Codrina Ionita +9
Engineering · Physics and Astronomy · #Atomic and Molecular Physics #FOS: Physical sciences #Laser-induced spectroscopy and plasma #Plasma Diagnostics and Applications #Plasma Physics (physics.plasm-ph) #physics.plasm-ph
paper · pdf · doi:10.48550/arxiv.physics/0410222
12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
arxiv created 2004/10/22 · openalex publication_date 2004/10/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The floating potential of a probe, emitting a sufficiently high electron current, yields a fairly accurate approximation of the plasma potential. This is an advantage in comparison to the conventional Langmuir probe where, after determination of the electron temperature Te, the plasma potential can only be derived indirectly from the formula Vpl = Vfl + aTe, where a is a function of the ratio of the electron to the ion saturation currents (a is around 2.4 in a magnetised hydrogen plasma). In addition, an emissive probe also works if there are electron drifts or beams in the plasma. Emissive probes are usually realised by small directly heated loops of W-wire. Drawbacks of this design are the limited lifetime, the low electron emissivity of W and the voltage drop across the wire. We have developed a new type of emissive probe, which is heated by an infrared high-power diode laser with a maximum output power of 50 W. The probe consists of a small cylinder of LaB6. The probe was inserted into the edge region of the VINETA helicon discharge plasma. Basic features of emissive probes were verified.