Langmuir probes compared with other diagnostic techniques in a Q-device

Autor:	J.G. Wegrowe, M. Hashmi, A.J. van der Houven van der Oordt
Rok vydání:	1968
Předmět:	Nuclear and High Energy Physics Electron density Materials science Plasma Condensed Matter Physics Ion Degree of ionization symbols.namesake Ionization symbols Electron temperature Langmuir probe Plasma diagnostics Atomic physics
Zdroj:	Nuclear Fusion. 8:197-201
ISSN:	1741-4326 0029-5515
DOI:	10.1088/0029-5515/8/3/007
Popis:	A comparison of density measurements between cylindrical Langmuir probes, resonance fluorescence scattering and microwave methods is performed in a singly ionized barium plasma of a Q-device by varying the following parameters: 1) Density n: 3 × 108 cm−3 ≤ n ≤ 3 × 1011 cm−3; 2) Plate temperature Tp: 2100°K ≤ Tp ≤ 2500°K; 3) Plate material: Re and W; 4) Magnetic field B: 2 kG ≤ B ≤ kG; 5) Mode of operation: Double and single ended operations; 6) Ion temperature Ti down to about room temperature, keeping the electron temperature Te = Tp; 7) Degree of ionization γ: 0.1% ≤ γ ≤ 100%; 8) Probe dimensions. If the density n is evaluated by equating the extrapolated ion saturation current Is at the plasma potential Vs to the random ion current, it is shown that this yields a reliable relative value of the plasma density, which is by a factor of about 2.5 higher than the most probable value.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dfa13eeca30d2a0a6190297c45a73ff4 https://doi.org/10.1088/0029-5515/8/3/007 Zobrazit plný text záznamu