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Theoretical and Experimental Studies of High-Frequency Plasma Structures; Etudes Theoriques et Experimentales sur les Structures HF a Plasma

Conference:

Abstract

The author has studied high-frequency structures at the resonance {omega}{sub ec} = {omega}{sub HF} in an inhomogeneous magnetic field. The following points have been developed theoretically: the complete (relativistic and non-linear) analytical description of individual movement, taking into account the fact that the number of revolutions of the particles in the resonance zone is high; study of the self-consistent space charge field, with a view to establishing the conditions necessary for the energy of the ions to be of the order of the energy gained by the electrons in the resonance zone; calculation of the self-consistent HF field in the accelerated plasma, with a view to establishing the conditions for optimum operation of the HF accelerator; the problem of the mirror losses. The experimental results were obtained with various devices constructed for the purpose of verifying the theoretical predictions. With the Circe-Pleiade, where the ionization and acceleration functions have been separated by means of ionization with a Circe device ({lambda} = 3 cm, 300 W), it has been verified the relativistic law of variation of the parallel ion energy as a function of the injected density (existence of a minimum density for the entrainment of ions) and of the applied  More>>
Authors:
Consoli, T. [1] 
  1. CEA, Centre d'Etudes Nucleaires de Saclay (France)
Publication Date:
Mar 15, 1969
Product Type:
Conference
Report Number:
IAEA-CN-24/J-1
Resource Relation:
Conference: 3. international conference on plasma physics and controlled nuclear fusion research, Novosibirsk, USSR (Russian Federation), 1-7 Aug 1968; Other Information: 3 refs., 12 figs.; Related Information: In: Plasma Physics and Controlled Nuclear Fusion Research. Proceedings of the Third International Conference on Plasma Physics and Controlled Nuclear Fusion Research. Vol. II| 852 p.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; ACCELERATORS; ATTENUATION; BEAM INJECTION; CHARGE EXCHANGE; DEUTERONS; ENTRAINMENT; GHZ RANGE; HIGH FREQUENCY AMPLIFIERS; IONS; KEV RANGE; MAGNETIC FIELDS; MIRRORS; NONLINEAR PROBLEMS; PLASMA; PLASMA JETS; REFLECTION; RELATIVISTIC RANGE; RESONANCE; SPACE CHARGE
OSTI ID:
22106298
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
French
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M0616064119
Submitting Site:
INIS
Size:
page(s) 361-379
Announcement Date:
Jun 20, 2013

Conference:

Citation Formats

Consoli, T. Theoretical and Experimental Studies of High-Frequency Plasma Structures; Etudes Theoriques et Experimentales sur les Structures HF a Plasma. IAEA: N. p., 1969. Web.
Consoli, T. Theoretical and Experimental Studies of High-Frequency Plasma Structures; Etudes Theoriques et Experimentales sur les Structures HF a Plasma. IAEA.
Consoli, T. 1969. "Theoretical and Experimental Studies of High-Frequency Plasma Structures; Etudes Theoriques et Experimentales sur les Structures HF a Plasma." IAEA.
@misc{etde_22106298,
title = {Theoretical and Experimental Studies of High-Frequency Plasma Structures; Etudes Theoriques et Experimentales sur les Structures HF a Plasma}
author = {Consoli, T.}
abstractNote = {The author has studied high-frequency structures at the resonance {omega}{sub ec} = {omega}{sub HF} in an inhomogeneous magnetic field. The following points have been developed theoretically: the complete (relativistic and non-linear) analytical description of individual movement, taking into account the fact that the number of revolutions of the particles in the resonance zone is high; study of the self-consistent space charge field, with a view to establishing the conditions necessary for the energy of the ions to be of the order of the energy gained by the electrons in the resonance zone; calculation of the self-consistent HF field in the accelerated plasma, with a view to establishing the conditions for optimum operation of the HF accelerator; the problem of the mirror losses. The experimental results were obtained with various devices constructed for the purpose of verifying the theoretical predictions. With the Circe-Pleiade, where the ionization and acceleration functions have been separated by means of ionization with a Circe device ({lambda} = 3 cm, 300 W), it has been verified the relativistic law of variation of the parallel ion energy as a function of the injected density (existence of a minimum density for the entrainment of ions) and of the applied HF power (TE{sub 111} cavity, 3 GHz, 700 W). With the Circe accelerator ({lambda} =3 cm, P = 2.5kW, CW) it has been verified that, for n{sub plasma} n{sub c} , because of the strong attenuation of the field due to the high index. With the Icare device ({lambda} = 25 cm, P{sub HF} = 1 MW for 100 {mu}s), operating with pre-ionization by laser focalization on a solid D{sub 2} target with an injection density always higher than the cut-off density, accelerated deuteron currents of more than 20 keV and of about 10 mA/cm{sub 2} were obtained. Ion entrainment for a magnetic field twice that necessary for resonance was also verified. Finally, with the Pleiade I device ({lambda} = 100 cm, P{sub HF} {approx}500 W, CW), the reflection of accelerated plasma jets by a mirror pulse lasting 75 {mu}s was verified. From measurements of the fast neutrals resulting from ion charge exchange (with the residual gas; p {<=} 10{sup -4} mmHg) it was deduced that the density of the ions (directed energy {approx} 1.5 keV) may be increased from 2 x 10{sub 8} cm{sup -3} (direct beam) to 6 x 10{sup 9} cm{sup -3} during the mirror pulse. The accumulated density appears to be limited by the charge exchange, and the increased duration of the mirror pulse to 200 {mu}s with p Less-Than-Or-Equivalent-To 10{sup -4} mmHg (unchanged) hardly improves the accumulation ratio. This agrees with the predictions if one takes into account the fact that the ion lifetime is {approx} 10 {mu}s. (author) [French] Il s'agit des etudes sur les structures HF a la resonance ( {omega}{sub ec} = {omega}{sub HF}) en champ magnetique inhomogene. Les points suivants ont ete developpes theoriquement: description analytique complete (relativiste et non lineaire) du mouvement individuel, compte tenu du fait que le nombre de revolutions des particules dans la zone de resonance est eleve ; etude du champ de charge d' espace autocoherent ( 'self-consistent') en vue d'etablir les conditions pour que l' energie des ions soit de l'ordre de celle gagnee par les electrons dans la zone de resonance; calcul du champ HF autocoherent dans le plasma accelere en vue d' etablir les conditions de fonctionnement optimum de l'accelerateur HF; probleme des pertes aux miroirs. Les resultats experimentaux ont ete obtenus avec divers dispositifs construits en vue de la verification des previsions theoriques.}
place = {IAEA}
year = {1969}
month = {Mar}
}