摘要:

Observations with a 27‐keV molecular ion injection experiment are described. In the experiment, an rf electric field is applied transversely to a containing magnetic mirror field in the mid‐region. The rf‐field intensity is proportional tor4, and the frequency relation is&ohgr; = 2.5&ohgr;ci = 5&ohgr;cm, whereris the radius, and&ohgr;ciand&ohgr;cmare the cyclotron frequencies of protons and hydrogen molecular ions, respectively. Accumulation of plasma greatly increases with an rf potential of about 1.4 kV, and a density of7×107 particles/cm3is obtained with an injection current of 2 mA. Perpendicular proton velocity distribution is well spread with an rf potential of about 1.4 kV. The spreading is caused during the process of deceleration of the injected molecular ions. Emissions at the second harmonic and the fourth harmonic of the proton cyclotron frequency are observed. Intensity of the fourth harmonic is reduced with a rise in strength of the rf field. As the rf field is switched off, there are plasma loss processes other than charge exchange. The loss may be due to a low‐frequency drift instability. In the presence of the rf field, however, there is no evidence of plasma loss by processes other than charge exchange. The rf field may set up a sufficiently deep well of equivalent quasipotential for ions of the present low‐density plasma.

ISSN:0031-9171    

DOI:10.1063/1.1693314

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The stability of a finitely conducting and inviscid liquid jet with uniform velocity and magnetic field is studied. Some analytical and numerical results are given. An unstable mode, not present in the infinitely conducting jet, exists for large conductivity and high magnetic field.

ISSN:0031-9171    

DOI:10.1063/1.1693315

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Stable longitudinal electron waves withK⊥Bare studied using a numerical simulation approach. The dispersion properties of these waves agree well with predictions from linear theory.

ISSN:0031-9171    

DOI:10.1063/1.1693316

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The perturbation method of Bogoliubov, Krylov, and Mitropolsky is applied to study the nonlinear effects for two transverse monochromatic waves in a cold plasma. Amplitude‐dependent wavelength and frequency shifts including relativistic corrections are derived.

ISSN:0031-9171    

DOI:10.1063/1.1693317

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Linear conversion of waves at the upper hybrid resonance for oblique propagation is considered. The conditions for the validity of a fourth‐order equation near the resonance are discussed. The cyclotron damping at&ohgr;≃2&ohgr;cfor the converted plasma wave is calculated.

ISSN:0031-9171    

DOI:10.1063/1.1693318

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Straightforward relationships among Weinstock's propagator,UA, the Vlasov propagator,U, and the ensemble average Vlasov propagator,⟨U⟩, are derived.Uand⟨U⟩Uare related to the characteristic trajectories of the Vlasov equation.

ISSN:0031-9171    

DOI:10.1063/1.1693319

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Self‐consistent solutions to the Vlasov‐Maxwell equations are given for three types of relativistic beams: (a) The current density is hollowed out on axis; (b) the current density is peaked on axis; and (c) the current density is uniform. The models used here give beams with sharp radial boundaries.

ISSN:0031-9171    

DOI:10.1063/1.1693320

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

A relation is derived predicting a&tgr;cz2/3B10/3Wi−1variation of ion density for onset of an ion‐cyclotron instability in a mirror‐confined plasma. This threshold behavior may explain why no complete density limitation has been observed in strongly unstable plasmas of two relevant experiments.

ISSN:0031-9171    

DOI:10.1063/1.1693321

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The critical current for the growth of ion acoustic waves in the presence of collisions is calculated by using a kinetic investigation with a collision integral of the Bhatnagar‐Gross‐Krook type. It is shown that electron‐ion collisions facilitate the ion acoustic oscillations.

ISSN:0031-9171    

DOI:10.1063/1.1693322

出版商:AIP    

年代:1971

数据来源: AIP

ISSN:0031-9171    

DOI:10.1063/1.1693323

出版商:AIP    

年代:1971

数据来源: AIP