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AbstractAbstract
[en] When a dense molecular beam injects perpendicularly into a tokamak plasma, the background electrons enter into molecular beam along the magnetic field lines would encounter a series of inelastic collisions, result in energy and momentum losses. This will induce an accumulation of electrons near the boundary of the molecular beam and form a double layer, its shielding effect makes the molecular beam penetrating longer distance
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Record Type
Journal Article
Journal
Chinese Science Abstracts; ISSN 1005-8923;
; v. 7(5); p. 633-635

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Levin, J.; Feldman, H.; Baer, A.; Ben-Hamu, D.; Zajfman, D.; Vager, Z.
The Israel Physical Society 1997 Annual Meeting. Program and abstracts1997
The Israel Physical Society 1997 Annual Meeting. Program and abstracts1997
AbstractAbstract
[en] Short communication
Primary Subject
Source
Israel Physical Society, Jerusalem (Israel); Bulletin of the Israel Physical Society; v. 43; 204 p; 17 Apr 1997; p. 95; Israel Physical Society; Beer Sheva (Israel); The Israel Physical Society 1997 Annual Meeting; Beer Sheva (Israel); 17 Apr 1997
Record Type
Miscellaneous
Literature Type
Conference
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Toader, E.I.; Graham, W.G.
Funding organisation: International Atomic Energy Agency (International Atomic Energy Agency (IAEA)); The National University Research Council - CNCSIS (Romania)2008
Funding organisation: International Atomic Energy Agency (International Atomic Energy Agency (IAEA)); The National University Research Council - CNCSIS (Romania)2008
AbstractAbstract
[en] Using a relatively simple semiclassical model, it is shown that transient, induced molecular negative ions (TIMNI), are produced through a potential barrier interaction between cold electron collisions and polarizable molecules in plasma. Such new negative ions lead to radio-frequency absorption in such discharges. The calculated radio-frequency absorption frequencies are consistent with earlier experimental measurements. (authors)
Primary Subject
Source
RESEARCH CONTRACT NO. 12411/RO; GRANT NO. 33379/04; 21 refs., 13 figs., 2 tabs.
Record Type
Journal Article
Journal
Nukleonika; ISSN 0029-5922;
; v. 53(3); p. 123-126

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Capdequi-Peyranere, P.
CEA Fontenay-aux-Roses, 92 (France); Faculte des Sciences de l'Universite de Paris, 75 (France)1966
CEA Fontenay-aux-Roses, 92 (France); Faculte des Sciences de l'Universite de Paris, 75 (France)1966
AbstractAbstract
[en] A study has been made of a new method of transverse injection of charged particles into a magnetic mirror configuration. This injection scheme permits the penetration and temporary capture by non-adiabatic effect of a particle beam of approximately 1 cm2 cross-section. A theoretical study of the injection and capture is made in the approximation that space charge is negligible. The original programs for IBM 7094 computer calculations are described; these programs were used to obtain an optimization of the configuration. The results of a statistical numerical study of the optimum configuration are then given. This study indicates that, if the energy of the particles of the beam is about 1 per cent greater than a minimum penetration energy, the entire beam can be captured with an average capture length of 100 meters (50 reflections between the two mirrors). If the energy is about 4 per cent greater than the minimum penetration energy, the capture length is reduced to 40 meters. We have studied the distribution of energy transverse and longitudinal with the magnetic field for the population of captured particles. For the cases of injected molecular hydrogen ions or heavy CH4+ ions, a study is made of the capture time of protons resulting from the dissociation of the ions by collisions with the neutral gas. Finally, we describe a model experiment using electrons designed to provide an experimental verification of the capture of the primary beam. (author)
[fr]
On etudie un nouveau schema d'injection transversale de particules chargees dans une configuration magnetique a miroirs. Ce mode d'injection permet la penetration et la capture temporaire par effet non adiabatique d'un faisceau de particules presentant une section de l'ordre de 1 cm2. Une etude theorique du probleme de l'injection et de la capture est faite en supposant la charge d'espace negligeable. On decrit des programmes originaux de calcul sur ordinateur IBM 7094 permettant l'optimisation de la configuration. On donne ensuite les resultats d'une etude numerique statistique de la capture dans la configuration obtenue. Cette etude montre que si l'energie des particules du faisceau est de 1 pour cent superieure a une energie minimum de penetration, la totalite du faisceau peut etre capturee avec une longueur moyenne de capture de 100 metres (50 reflexions entre lesdeux miroirs). Si l'energie est de 4 pour cent superieure a l'energie minimum de penetration la longueur de capture se reduit 40 metres. On etudie la repartition de l'energie de la population des particules capturees en energie perpendiculaire et energie longitudinale au champ magnetique. Les particules injectees etant supposees etre des ions moleculaires d'hydrogene ou des ions lourds CH4+, une etude du temps de capture des protons resultant d'une dissociation des ions injectes sur le gaz neutre est faite. On decrit enfin un modele a electrons destine a apporter une verification experimentale de la capture du faisceau primaire. (auteur)Original Title
Etude de l'injection et de la capture temporaire d'un faisceau de particules chargees dans une configuration magnetique ouverte. Optimisation de la configuration. Cas de la symetrie de revolution: Machine a miroirs
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Source
Dec 1966; [134 p.]; 7 refs.; These sciences
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Report
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Thesis/Dissertation
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AbstractAbstract
[en] This year, three main topics of research and development have been pursued at the REX-ISOLDE facility low-energy stage, complementary to the energy upgrade of the postaccelerator. These concern the ion cooling method tests, the charge exchange process study in the buffer gas of the Penning trap REXTRAP, and the molecular beam injection into the trap and REXEBIS ion source. We report here on some progress in these different investigations. (orig.)
Primary Subject
Source
ENAM '04: 4. international conference on exotic nuclei and atomic masses; Pine Mountain, GA (United States); 12-16 Sep 2004; Available from: http://dx.doi.org/10.1140/epjad/i2005-06-150-9
Record Type
Journal Article
Literature Type
Conference
Journal
European Physical Journal. A; ISSN 1434-6001;
; v. 25(Suppl.1); p. 739-741

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AbstractAbstract
[en] The reactor systems papers presented at the Innsbruck Conference can be conveniently divided into four categories: tokamaks; magnetic confinement, non-tokamaks; inertial confinement; and special topics that include plasma engineering and alternate applications of fusion
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Nucl. Fusion; Suppl. 1979; v. 3 p. 479-485; ISBN 92-0-130279-7;
; 1979; v. 3 p. 479-485; IAEA; Vienna; 7. international conference on plasma physics and controlled nuclear fusion research; Innsbruck, Austria; 23 - 30 Aug 1978

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Book
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Conference
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Piekoszewski, J.; Gryzinski, M.; Langner, J.; Werner, Z.
Institute of Nuclear Research, Warsaw (Poland)1981
Institute of Nuclear Research, Warsaw (Poland)1981
AbstractAbstract
[en] The first use of pulsed plasma beam to implant the doping atoms into semiconductor and simultaneously to recrystallize its near surface layer is reported. The method referred to as Pulse Implantation Doping (PID) is a genuine single step technique. The results of pilot experiments with PID of boron into n-type silicon substrate using Rod Plasma Injector machine are presented and discussed. (author)
Source
1981; 20 p; Available from Energetics and Atomic Energy Information Centre, Warsaw, Poland
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Report
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AbstractAbstract
[en] The designs and costs of magnetic-confinement experimental devices and reactors can be affected strongly by the choice of parameters for the neutral-beam injection system. To provide the designer with information with which to estimate the physical and cost consequences of variations in energy, neutralizer thickness, ion-species mixtures, etc., we are carrying out parametric studies of the neutralization efficiency. Some of the results are reported here. The data base is too small and uncertain to permit calculations which would optimize all aspects of design at this time
Primary Subject
Source
Kulcinski, G.L. (ed.); Energy Research and Development Administration, Washington, D.C. (USA); p. 1221-1231; 1976; 2. topical meeting on the technology of controlled nuclear fusion; Richland, Washington, United States of America (USA); 21 - 23 Sep 1976
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Report
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AbstractAbstract
[en] Two-dimensional numerical plasma simulations have been carried out in a uniform magnetic field to study the effects of neutral beam injection on plasma diffusion. Neutral beams injected across a magnetic field are assumed to be ionized by various ionization processes in a plasma. It is found that the suprathermal convective motion of a plasma generated by the injection of neutral beams is dissipated via anomalous viscosity, leading to enhanced cross-field diffusion. The diffusion coefficient depends weakly on the magnetic field and plasma density, similar to the diffusion caused by thermally excited convective cells. The magnitude of the diffusion increases with the injection energy and is much larger than the thermal diffusion because of the presence of suprathermal plasma convection. It is shown that a similar anomalous plasma diffusion may occur in a plasma subject to radio frequency (rf) wave heating where only a localized region of a plasma across the magnetic field is heated to a temperature much higher than the surrounding temperature. Theoretical investigations are described on the scaling of enhanced plasma diffusion
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Journal Article
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Barber, G.C.; Blue, C.W.; Dagenhart, W.K.
Plasma physics and controlled nuclear fusion research 19801981
Plasma physics and controlled nuclear fusion research 19801981
AbstractAbstract
[en] Neutral-beam injectors have been developed and applied successfully for injection heating of PLT and ISX-B plasmas. Present and near-future injection systems for PDX, ISX-C, DIII, MFTF and TFTR are similar in principle, although scaled in beam energy, current and pulse width to meet the machine requirements. In addition, as shown in recent calculations, an INTOR or ETF device will also utilize a positive-ion-based system with possible trade-offs between beam energy, current and pulse length, i.e. beam energies of about 100keV are acceptable if the current and/or pulse length may be increased to appropriate values. Recent direct energy recovery experiments have shown that a positive-ion-based system can be expected to operate at an overall system efficiency of up to 50% if the beam energy is limited to a value below 75keV/nucleon. For injection energy above 200keV, a negative-ion-based neutral-beam injector may be needed. The performance highlights are reported of the existing ORNL and LBL/LLL beam systems and the necessary R and D needs for future high-efficiency, long-pulse beam systems. (author)
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Nucl. Fusion; Suppl. 1981; 857 p; ISBN 92-0-130181-2;
; 1981; v. 2 p. 449-456; IAEA; Vienna; 8. international conference on plasma physics and controlled nuclear fusion research; Brussels, Belgium; 1 - 10 Jul 1980; IAEA-CN--38/Q-1

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Book
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