A New Double Probe System for Studies of Non-Uniform Plasmas
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedade Brasileira de Física
2003
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| _version_ | 1876474814088085504 |
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| author | G. Petraconi |
| author_facet | G. Petraconi |
| contents | A New Double Probe System for Studies of Non-Uniform Plasmas G. Petraconi H. S. Maciel Física, Astronomía y Matemáticas A theoretical and experimental study was developed about the applicability of a double probe system consisting of two directional Langmuir probes, both probes being located separately in a plasma column. The current- voltage characteristic of the double probe was obtained considering a plasma with a drifting maxwellian electron velocity distribution function and stationary ion background. In deriving the characteristic of the double probe, the plasma parameters, namely, electron temperature (Te), electron density (Ne), electron drift velocity (Vde) and plasma potential (Vp) are assumed to be non-uniform. The double probe characteristic is also dependent on the angle between the axial direction of the electron drift and the normal to the collecting area of the probe. Each probe can be rotated such that this angle can be varied between zero and 180 degrees. Various probe characteristics were simulated using plasma parameters obtained by independent single probe measurements in the positive column of a low-pressure arc discharge in mercury vapor. Typical parameters of the positive column, used in the simulation, are: Te = 5 eV, Ne = 1017 m¡3, vde = 8x105 ms¡1. Experimental characteristics of the double probe were obtained and compared with the simulated results, showing good agreement. It is concluded that this directional probe system can be a reliable diagnostic tool especially for studies of non-uniform plasmas. 2003 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413573030 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4 Vol.33 |
| format | Artículo científico |
| id | redalyc_46413573030 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | A New Double Probe System for Studies of Non-Uniform Plasmas G. Petraconi Física, Astronomía y Matemáticas A New Double Probe System for Studies of Non-Uniform Plasmas G. Petraconi H. S. Maciel Física, Astronomía y Matemáticas A theoretical and experimental study was developed about the applicability of a double probe system consisting of two directional Langmuir probes, both probes being located separately in a plasma column. The current- voltage characteristic of the double probe was obtained considering a plasma with a drifting maxwellian electron velocity distribution function and stationary ion background. In deriving the characteristic of the double probe, the plasma parameters, namely, electron temperature (Te), electron density (Ne), electron drift velocity (Vde) and plasma potential (Vp) are assumed to be non-uniform. The double probe characteristic is also dependent on the angle between the axial direction of the electron drift and the normal to the collecting area of the probe. Each probe can be rotated such that this angle can be varied between zero and 180 degrees. Various probe characteristics were simulated using plasma parameters obtained by independent single probe measurements in the positive column of a low-pressure arc discharge in mercury vapor. Typical parameters of the positive column, used in the simulation, are: Te = 5 eV, Ne = 1017 m¡3, vde = 8x105 ms¡1. Experimental characteristics of the double probe were obtained and compared with the simulated results, showing good agreement. It is concluded that this directional probe system can be a reliable diagnostic tool especially for studies of non-uniform plasmas. 2003 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413573030 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4 Vol.33 |
| title | A New Double Probe System for Studies of Non-Uniform Plasmas |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46413573030 |