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[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
Journal
Chinese Science Abstracts; ISSN 1005-8923; 
; v. 7(5); p. 633-635
; v. 7(5); p. 633-635
[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)
Journal
Nukleonika; ISSN 0029-5922; ; v. 53(3); p. 123-126
; v. 53(3); p. 123-126
[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.)
Journal
European Physical Journal. A; ISSN 1434-6001; ; v. 25(Suppl.1); p. 739-741
; v. 25(Suppl.1); p. 739-741
[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
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
; 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
[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
Journal
[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)
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
; 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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