Abstract
When an ionic beam is used (space simulation etc...) it needs a forced space charge neutralization by means of electrons injection when the perturbations resulting from the ionic space charge are not already eliminated by the well known self neutralization of the beam on the back ground gas of the tank. We have shown that it is possible to obtain the forced neutralization of a low energy (a few KeV) Hg{sup +} ion beam, 10 cm in diameter, with a neutraliser made of a hot emissive filament located inside the beam close to the ion source. The computed solution of the plane waves dispersion equation has shown that the synthesized plasma, resulting from the neutralised beam, is damping fluctuations with any wave length when the average ions velocity is less than the neutralizing electrons thermal velocity. This last conclusion assumes that no external electromagnetic field is applied. When a longitudinal electric field is applied, by means of a polarized grid into the beam, the plasma stability range is changed. (author) [French] Pour toutes les utilisations des faisceaux ioniques (soufleries ioniques etc...), ou les phenomenes perturbateurs dus a la charge d'espace positive des ions ne sont pas elimines par le mecanisme
More>>
Spiess, G
[1]
- Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Citation Formats
Spiess, G.
Study of the synthesized plasma resulting from forced neutralization of a mercury ions beam; Etude du plasma de synthese resultant de la neutralisation forcee d'un faisceau d'ions Hg{sup +}.
France: N. p.,
1969.
Web.
Spiess, G.
Study of the synthesized plasma resulting from forced neutralization of a mercury ions beam; Etude du plasma de synthese resultant de la neutralisation forcee d'un faisceau d'ions Hg{sup +}.
France.
Spiess, G.
1969.
"Study of the synthesized plasma resulting from forced neutralization of a mercury ions beam; Etude du plasma de synthese resultant de la neutralisation forcee d'un faisceau d'ions Hg{sup +}."
France.
@misc{etde_20528722,
title = {Study of the synthesized plasma resulting from forced neutralization of a mercury ions beam; Etude du plasma de synthese resultant de la neutralisation forcee d'un faisceau d'ions Hg{sup +}}
author = {Spiess, G}
abstractNote = {When an ionic beam is used (space simulation etc...) it needs a forced space charge neutralization by means of electrons injection when the perturbations resulting from the ionic space charge are not already eliminated by the well known self neutralization of the beam on the back ground gas of the tank. We have shown that it is possible to obtain the forced neutralization of a low energy (a few KeV) Hg{sup +} ion beam, 10 cm in diameter, with a neutraliser made of a hot emissive filament located inside the beam close to the ion source. The computed solution of the plane waves dispersion equation has shown that the synthesized plasma, resulting from the neutralised beam, is damping fluctuations with any wave length when the average ions velocity is less than the neutralizing electrons thermal velocity. This last conclusion assumes that no external electromagnetic field is applied. When a longitudinal electric field is applied, by means of a polarized grid into the beam, the plasma stability range is changed. (author) [French] Pour toutes les utilisations des faisceaux ioniques (soufleries ioniques etc...), ou les phenomenes perturbateurs dus a la charge d'espace positive des ions ne sont pas elimines par le mecanisme bien connu de l'autoneutralisation sur le gaz residuel de l'enceinte a vide, il faut assurer une neutralisation forcee de la charge d'espace par injection d'electrons dans le faisceau. Nous avons montre qu'il est possible d'assurer la neutralisation forcee d'un faisceau d'ions Hg{sup +}, de grand diametre (10 cm) et d'une energie de quelques KeV, avec un neutraliseur constitue d'un filament chaud emissif immerge dans le faisceau au voisinage de la source d'ions. La resolution numerique de l'equation de dispersion des ondes planes a montre que le plasma de synthese, forme par le faisceau neutralise, amortit les fluctuations de toute longueur d'onde lorsque la vitesse moyenne des ions est inferieure a la vitesse thermique des electrons de neutralisation, en l'absence de champ electromagnetique externe. La presence d'un champ electrique longitudinal, cree par une grille polarisee et plongee dans le faisceau, modifie les conditions de stabilite du plasma de synthese. (auteur)}
place = {France}
year = {1969}
month = {Jul}
}
title = {Study of the synthesized plasma resulting from forced neutralization of a mercury ions beam; Etude du plasma de synthese resultant de la neutralisation forcee d'un faisceau d'ions Hg{sup +}}
author = {Spiess, G}
abstractNote = {When an ionic beam is used (space simulation etc...) it needs a forced space charge neutralization by means of electrons injection when the perturbations resulting from the ionic space charge are not already eliminated by the well known self neutralization of the beam on the back ground gas of the tank. We have shown that it is possible to obtain the forced neutralization of a low energy (a few KeV) Hg{sup +} ion beam, 10 cm in diameter, with a neutraliser made of a hot emissive filament located inside the beam close to the ion source. The computed solution of the plane waves dispersion equation has shown that the synthesized plasma, resulting from the neutralised beam, is damping fluctuations with any wave length when the average ions velocity is less than the neutralizing electrons thermal velocity. This last conclusion assumes that no external electromagnetic field is applied. When a longitudinal electric field is applied, by means of a polarized grid into the beam, the plasma stability range is changed. (author) [French] Pour toutes les utilisations des faisceaux ioniques (soufleries ioniques etc...), ou les phenomenes perturbateurs dus a la charge d'espace positive des ions ne sont pas elimines par le mecanisme bien connu de l'autoneutralisation sur le gaz residuel de l'enceinte a vide, il faut assurer une neutralisation forcee de la charge d'espace par injection d'electrons dans le faisceau. Nous avons montre qu'il est possible d'assurer la neutralisation forcee d'un faisceau d'ions Hg{sup +}, de grand diametre (10 cm) et d'une energie de quelques KeV, avec un neutraliseur constitue d'un filament chaud emissif immerge dans le faisceau au voisinage de la source d'ions. La resolution numerique de l'equation de dispersion des ondes planes a montre que le plasma de synthese, forme par le faisceau neutralise, amortit les fluctuations de toute longueur d'onde lorsque la vitesse moyenne des ions est inferieure a la vitesse thermique des electrons de neutralisation, en l'absence de champ electromagnetique externe. La presence d'un champ electrique longitudinal, cree par une grille polarisee et plongee dans le faisceau, modifie les conditions de stabilite du plasma de synthese. (auteur)}
place = {France}
year = {1969}
month = {Jul}
}