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IEEE Transactions on Plasma Science

Issue 6 • Date Dec 1989

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Displaying Results 1 - 11 of 11
  • Spatially resolved plasma emission and absorption coefficient measurements by an optical fiber probe

    Publication Year: 1989, Page(s):870 - 874
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The plasma emission and absorption coefficients were measured by means of two different techniques using an optical fiber probe in a parallel-plate RF glow discharges. The first technique can, in principle, provide three-dimensional resolution with the movement of the probe, while the second technique provides only a line-average measurement. The results of two different measurement methods and th... View full abstract»

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  • Frequency-tunable, high-power microwave emission from cyclotron autoresonance maser oscillation and gyrotron interactions

    Publication Year: 1989, Page(s):906 - 908
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors report experimental observations of high-power microwave emission from both the high-frequency cyclotron autoresonance maser (CARM) oscillation and the low-frequency gyrotron interaction. High-power (3-10 MW) microwave emission is attributed to the CARM mechanism, which is magnetically tunable through discrete axial cavity modes from 15 through 16.7 GHz. For the same experimental param... View full abstract»

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  • Three-halves harmonic emission from a laser filament in a plasma channel

    Publication Year: 1989, Page(s):849 - 853
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A self-trapped laser filament is susceptible to decay-producing radially localized Langmuir waves. A nonlinear interaction of the pump wave with the density oscillation at the Langmuir frequency gives rise to three-halves harmonic emissions. Using a basis-function expansion technique, the emitted power in the backward direction is obtained. It decreases with the increasing size of the filament View full abstract»

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  • Solitons at the critical density of negative ions in multicomponent plasmas

    Publication Year: 1989, Page(s):863 - 869
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    The derivation of solitary waves in generalized multicomponent plasmas shows that the negative ion introduces a critical density at which the characteristics of the solitons are studied. The soliton's behavior derived using the Korteweg-deVries (KdV) equation at the critical density shows that the nonlinearity of the wave vanishes. Thus the mode of study is augmented through a modified KdV equatio... View full abstract»

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  • Origin of the magnetic confinement force in the homogeneous Z pinch

    Publication Year: 1989, Page(s):854 - 858
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A reexamination is made of the basic assumptions about magnetic force and magnetic pressure in a pinch. The confinement of a plasma by its own internal magnetic field is analyzed in a cylindrical geometry. It is shown that there are subtle but serious ambiguities in the usual theory, which can be cleared up by elementary arguments. The results which follow lead to an improved understanding of the ... View full abstract»

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  • Pulsed cathode heating method

    Publication Year: 1989, Page(s):898 - 905
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    A pulsed-mode heating method has been developed and tested for a 1-in.-diameter cathode which reduces the average filament power by over an order of magnitude. The method allows cyclic operation with a few seconds of peak cathode temperature, which allows many microsecond-duration electron pulses to be fired at the peak cathode temperature in each cycle. For a 2-in.-diameter 0.125-in.-thick LaB View full abstract»

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  • A model for the operation of a laser-triggered vacuum low-inductance switch

    Publication Year: 1989, Page(s):859 - 862
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A new model for the operation of a laser-triggered vacuum switch utilizing a composite target pellet in the cathode is given along with supporting experimental results. It is shown that two separate mechanisms are responsible for the operation of the switch, namely, a thermal mechanism for the initial current flow and an ion regeneration mechanism for the current buildup. The current buildup is st... View full abstract»

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  • Recovery properties of vacuum spark gaps

    Publication Year: 1989, Page(s):889 - 897
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    The authors investigated the recovery properties of a 90-kV, 15-kA multiple site, triggered vacuum spark gap. Triggering was accomplished with a multisite surface flashover plasma source with approximately 60 sites distributed over a 10 cm2 area. Gap dimensions were 1-cm spacing by 7.5-cm diameter. Recovery measurements were performed utilizing an inductively recharged double pulse circ... View full abstract»

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  • Analytic expression for the electric potential in the plasma sheath

    Publication Year: 1989, Page(s):884 - 888
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    An expression for the spatial dependence of the electric potential in a collisionless and source-free planar plasma sheath is presented. This expression is derived by analogy with Child's law and approaches Child's law asymptotically as the potential drop φW across the sheath becomes large, |eφW/kTe|>104. Here k is B... View full abstract»

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  • Two-dimensional finite-element method analysis of various antennas for ICRF plasma heating

    Publication Year: 1989, Page(s):880 - 883
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Two-dimensional finite-element analysis is performed for ion-cyclotron range of frequency (ICRF) antennas with various cross-sectional configurations. Interest is mainly focused on the quantitative difference in the input impedance among various antennas such as the normal loop antenna, the antenna with surrounding limiter walls, and the antenna buried into the cutoff cavity. For analytical simpli... View full abstract»

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  • Motion of high-current vacuum arcs on spiral-type contacts

    Publication Year: 1989, Page(s):875 - 879
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Motion of vacuum arcs on spiral-type contacts is not only controlled by self-induced magnetic fields, but also by heating phenomena. An expression is derived which permits the calculation of the speed of the arc from a computation of the time needed to heat the surface up to boiling temperature. The heat flux density of the constricted arc at the anode is required as input for the calculation. Goo... View full abstract»

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IEEE Transactions on Plasma Sciences focuses on plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology.

 

 

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Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
1428 Miracerros Loop South
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