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Study of high frequency instabilities on a cold cathode reflex discharge; Contribution a l'etude des instabilites a haute frequence dans la decharge reflex a cathodes froides

Abstract

The cold cathode reflex discharge develops a cathode sheath of several hundreds of volts, which accelerates electrons released from the cathode to high velocities along the lines of the axial magnetic field. On the studied pressure range (4.10{sup -4} torr < p < 2.10{sup -2} torr) the plasma density is about 10{sup 11} cm{sup -3}. Under certain conditions high frequency (1 5000 MHz) instabilities appear. These instabilities are found to profoundly modify the mean characteristics of the discharge. In particular, particle flow across the lines of magnetic field is found to be considerably greater than that predicted by classical diffusion theory. Theoretical considerations are presented with complementary experimental results. They show that the high frequency instabilities are a result of the fast electronic assembly accelerated through the cathode sheath. (author) [French] Dans certaines conditions, qui sont precisees, des instabilites a haute frequence (1 5000 MHz) se developpent dans la decharge reflex a cathodes froides. Lorsque le plasma (n {approx_equal}10{sup 11} cm{sup -3}) est instable, les caracteristiques moyennes de la decharge sont profondement alterees. Les fuites de particules a travers les lignes de forces du champ magnetique statique applique deviennent en particulier trop importantes pour que le seul effet classique des  More>>
Authors:
Gregoire, M [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jun 01, 1965
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2822
Resource Relation:
Other Information: TH: These sciences; 50 refs
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLD CATHODE TUBES; COLD PLASMA; DISPERSION RELATIONS; ELECTRIC FIELDS; ELECTRONS; EQUILIBRIUM PLASMA; FREQUENCY ANALYSIS; HIGH-FREQUENCY DISCHARGES; ION MOBILITY; IONIZATION; MAGNETIC FIELDS; MHZ RANGE; PLASMA DENSITY; PLASMA INSTABILITY; PLASMA PRODUCTION; PRESSURE DEPENDENCE; SLOWING-DOWN; VELOCITY
OSTI ID:
20680266
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Faculte des Sciences de l'Universite de Paris, 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2822115156
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
78 pages
Announcement Date:
Jan 07, 2006

Citation Formats

Gregoire, M. Study of high frequency instabilities on a cold cathode reflex discharge; Contribution a l'etude des instabilites a haute frequence dans la decharge reflex a cathodes froides. France: N. p., 1965. Web.
Gregoire, M. Study of high frequency instabilities on a cold cathode reflex discharge; Contribution a l'etude des instabilites a haute frequence dans la decharge reflex a cathodes froides. France.
Gregoire, M. 1965. "Study of high frequency instabilities on a cold cathode reflex discharge; Contribution a l'etude des instabilites a haute frequence dans la decharge reflex a cathodes froides." France.
@misc{etde_20680266,
title = {Study of high frequency instabilities on a cold cathode reflex discharge; Contribution a l'etude des instabilites a haute frequence dans la decharge reflex a cathodes froides}
author = {Gregoire, M}
abstractNote = {The cold cathode reflex discharge develops a cathode sheath of several hundreds of volts, which accelerates electrons released from the cathode to high velocities along the lines of the axial magnetic field. On the studied pressure range (4.10{sup -4} torr < p < 2.10{sup -2} torr) the plasma density is about 10{sup 11} cm{sup -3}. Under certain conditions high frequency (1 5000 MHz) instabilities appear. These instabilities are found to profoundly modify the mean characteristics of the discharge. In particular, particle flow across the lines of magnetic field is found to be considerably greater than that predicted by classical diffusion theory. Theoretical considerations are presented with complementary experimental results. They show that the high frequency instabilities are a result of the fast electronic assembly accelerated through the cathode sheath. (author) [French] Dans certaines conditions, qui sont precisees, des instabilites a haute frequence (1 5000 MHz) se developpent dans la decharge reflex a cathodes froides. Lorsque le plasma (n {approx_equal}10{sup 11} cm{sup -3}) est instable, les caracteristiques moyennes de la decharge sont profondement alterees. Les fuites de particules a travers les lignes de forces du champ magnetique statique applique deviennent en particulier trop importantes pour que le seul effet classique des collisions binaires puisse les expliquer. L'ionisation du gaz est assuree par une assemblee electronique qui acquiert dans les gaines cathodiques ({approx_equal} 500 volts) une vitesse, parallele au champ magnetique, importante. La discussion de resultats theoriques et une experience complementaire montrent que cette population d'electrons rapides, tres distincte de celle des electrons lents du plasma pour les pressions les plus faibles du domaine etudie (4.10{sup -4} torr < p < 2.10{sup -2} torr), est responsable des instabilites a haute frequence observees. (auteur)}
place = {France}
year = {1965}
month = {Jun}
}