dorsal/arxiv
View SchemaFirst result on a laser-heated emissive probe
| Authors | Ramin Madani, Codrina Ionita, Roman Schrittwieser, Thomas Klinger |
|---|---|
| Categories | |
| ArXiv ID | physics/0410222 |
| URL | https://arxiv.org/abs/physics/0410222 |
Abstract
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.
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"abstract": "The floating potential of a probe, emitting a sufficiently high electron\ncurrent, yields a fairly accurate approximation of the plasma potential. This\nis an advantage in comparison to the conventional Langmuir probe where, after\ndetermination of the electron temperature Te, the plasma potential can only be\nderived indirectly from the formula Vpl = Vfl + aTe, where a is a function of\nthe ratio of the electron to the ion saturation currents (a is around 2.4 in a\nmagnetised hydrogen plasma). In addition, an emissive probe also works if there\nare electron drifts or beams in the plasma. Emissive probes are usually\nrealised by small directly heated loops of W-wire. Drawbacks of this design are\nthe limited lifetime, the low electron emissivity of W and the voltage drop\nacross the wire. We have developed a new type of emissive probe, which is\nheated by an infrared high-power diode laser with a maximum output power of 50\nW. The probe consists of a small cylinder of LaB6. The probe was inserted into\nthe edge region of the VINETA helicon discharge plasma. Basic features of\nemissive probes were verified.",
"arxiv_id": "physics/0410222",
"authors": [
"Ramin Madani",
"Codrina Ionita",
"Roman Schrittwieser",
"Thomas Klinger"
],
"categories": [
"physics.plasm-ph"
],
"title": "First result on a laser-heated emissive probe",
"url": "https://arxiv.org/abs/physics/0410222"
},
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