By Topic

Plasma Science, IEEE Transactions on

Issue 3 • Date Jun 1991

Filter Results

Displaying Results 1 - 10 of 10
  • On the current-driven electrostatic ion-cyclotron instability: a review

    Publication Year: 1991 , Page(s): 457 - 501
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4304 KB)  

    Theoretical, numerical, and experimental investigations of the electrostatic ion-cyclotron instability (EICI) are critically reviewed. The discussion of theory focuses mainly on the linear theories, with particular attention to those that have been used in explaining experimental observations, but a short account of various nonlinear theories is also given. Numerical simulation results are surveyed. Experimental investigations in Q-machine plasmas and their interpretation in terms of various theories are then examined View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Enhancement of the radiation yield, in plasma flow switch experiments

    Publication Year: 1991 , Page(s): 502 - 509
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    The Shiva Star fast capacitor bank, an inductive store, and a plasma flow switch were used to deliver multimegaampere currents with submicrosecond rise times to cylindrical foil loads. A series of numerical simulations of the plasma flow switch/imploding load system were performed with the goal of discovering a way to boost the total power radiated by the imploding plasma as it stagnates on the axis of symmetry. The changes to the experimental design that were investigated include variations of the shape of the electrodes, size and mass of the load foil, structure of the axial view vanes, shape and mass of the switching plasma, material from which the load is constructed, the degree to which the load is bowed, and the energy of the capacitor bank. Radiation yields in the range 6-9 TW are predicted for future experiments on Shiva Star View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An investigation of the ion beam of a plasma focus using a metal obstacle and deuterated target

    Publication Year: 1991 , Page(s): 515 - 519
    Cited by:  Papers (5)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    The results of an experimental study of the ion beam properties of a 3.3-kJ, 15-kV plasma focus are reported. The plasma focus is operated at 3 torr deuterium, and neutron yield measurements are made with a copper obstacle or deuterated target placed at various axial positions from the end of the anode. It is found that in the normal operation of the focus without an obstacle or target, less than 15% of the neutrons are produced within the pinch column, and that more than 85% of the neutrons arise from the deuterium-ion-beam bombardment of the deuterium gas in the region 20-60 mm from the end of the anode. The neutron production is highest between 30-40 mm from the anode. The results are valid only for a small focus View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Use of an inverse method on the determination of the evolution of a self-blown electric arc in the air

    Publication Year: 1991 , Page(s): 510 - 514
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    An inverse method for studying the dynamic behavior of a low-voltage arc column is presented. A small number of microcoils are placed at suitably chosen points. The measured inductions are recorded during the whole arc life, and the evolution curves of the position of the anodic and cathodic roots, as well as those of the arc column gradient, assumed to be threadlike, can be obtained analytically. From such results it is easy to define the speed and acceleration of the anodic and cathodic roots, allowing the column behavior to be defined during the entire blowing phase. Moreover, the geometry of the breaking device is the only factor that must be taken into account View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A phase-space particles motion scheme for electron kinetic simulation

    Publication Year: 1991 , Page(s): 520 - 524
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    A phase-space particle motion scheme (PSPMS) for electron kinetic simulation is proposed. This scheme is based on the convenient representation of electron motion in phase space using the particles method. PSPMS offers the possibility of calculating the electron energy distribution function (EEDF) much faster than by conventional methods. PSPMS electron calculation is shown to match convective scheme and Monte Carlo simulations of swarms in the uniform electric field and the cathode fall (CF). PSPMS may be used for a self-consistent model of low-pressure glow discharge construction View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Overdamped arc discharge data and an AWA model

    Publication Year: 1991 , Page(s): 529 - 534
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    Experimental data on overdamped arc discharges are compared with a lumped-circuit discharge mode employing the arc welder's ansatz (AWA). The AWA prescribes that the arc resistance-varies time as Ra(t)=V*/|I(t)|, where V* is a positive constant and I(t) is the discharge current. In the circuit, in addition to the time-dependent arc resistance Ra and a small arc inductance L a, there are an external time-dependent series resistance Ro, inductance Lo, and source capacitance C, the values of which are given. The AWA theory is compared with an observed arc current pulse I(t) by using these given values and normalizing the theory to one point on the data curve; an adequate fit to the data is obtained. Data for the dynamic arc resistance Ra(t) are also compared with the AWA prescription and with other available theories for Ra, which also use a one-point normalization. The AWA form for Ra compares favorably with the other theories View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A model for steady-state large-volume plasma generation

    Publication Year: 1991 , Page(s): 535 - 542
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (684 KB)  

    A simple scheme for generating a uniform, steady-state, large-volume plasma is presented. The weakly magnetized plasma is created by direct ionization of the background gas by low-energy electrons generated from thermionic filaments. An annular arrangement of the filaments ensures a uniform plasma density in the radial direction as predicted by theory. Experiments have been performed to characterize the plasma generated in such a configuration. In order to explain the experimental observation, a bulk plasma theory based on plasma transport by means of cross-field diffusion is developed. As assumed in the theoretical model, the experimental measurements indicate a uniform plasma density along the axis. Both the theory and experiment indicate that the plasma density is a function of the square of the external magnetic field. The theory also predicts the plasma density to be proportional to the neutral density to the two-thirds power, in agreement with the experimental data. The experimental data agree well with theoretical prediction for a broad range of system parameters View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of time-dependent characteristics for a pseudospark discharge in air

    Publication Year: 1991 , Page(s): 525 - 528
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    The time-dependent resistive voltage and resistance of a pseudospark discharge in air are obtained by solving the equivalent circuit equation using the measured values of the discharge current and breakdown voltage. Pulsed, underdamped discharge currents ranging from about 30 to 100 A are investigated experimentally. The gas pressures range from 0.005-0.1 torr. The discharges can be characterized by three phases: initial, quasi-stationary, and relaxation. The quasi-stationary phase occurs near the time of the current maximum. The variations of the resistive pseudospark voltage are similar to those observed in a spark discharge, which can explain the sparklike behavior of a pseudospark discharge. Details of the current-voltage characteristics and resistance are presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radiation of ion acoustic waves in a dispersive positive ion-negative ion plasma

    Publication Year: 1991 , Page(s): 545 - 547
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (188 KB)  

    Experimental results that illustrate some properties of the radiation of a longitudinal ion acoustic wave launched from a solid metal disk antenna inserted in a dispersive positive-ion-negative-ion plasma are presented. The negative ions replace the free electrons in the plasma and increase the electron Debye length, hence increasing the dispersion of the plasma. It is observed that the radiation of waves in a dispersive media is significantly more complicated than in a nondispersive media. It is not possible to draw one universal radiation pattern for the radiation of the waves in this case, since so many frequency components are present in the wave and they change as the wave evolves View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Single-particle trajectories in a cusped magnetic field

    Publication Year: 1991 , Page(s): 543 - 545
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    The trajectories of a single charged particle in relation to the cusp axis and cusp plane in a cusped magnetic field are numerically studied. The results show that the particle reflected by the cusp field forms a double helix; i.e., the helix itself makes a helical motion. The location of the reflection point extends well into the injection side of the cusp plane, suggesting that a diverging magnetic field of appropriate geometry may be able to reflect a charged particle. However, the location of the reflection point does not alter the nature of the trajectory View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

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

 

 

Full Aims & Scope

Meet Our Editors

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
Santa Fe, NM  87505  87505  USA
tps-editor@ieee.org
Phone:505-988-5751
Fax:505-988-5751 (call first)