By Topic

Plasma Science, IEEE Transactions on

Issue 1 • Date March 1976

Filter Results

Displaying Results 1 - 19 of 19
  • Table of contents

    Publication Year: 1976 , Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (132 KB)  
    Freely Available from IEEE
  • IEEE Transactions on Plasma Science

    Publication Year: 1976 , Page(s): c2
    Save to Project icon | Request Permissions | PDF file iconPDF (220 KB)  
    Freely Available from IEEE
  • Determination of the Radial Potential Profile in the Modified Penning Discharge with a Heavy Ion Beam Probe

    Publication Year: 1976 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1148 KB)  

    A heavy ion beam probe is used to examine the radial electrostatic potential profile in the Modified Penning Discharge. The plasma potential in the discharge violates the usual constraint on the ion beam energy in that the primary probing beam energy undergoes large changes in its energy while passing through the plasma. In order to determine the radial potential profile, the primary beam trajectories are calculated to agree with measured trajectories by parametric variation of a potential model in the trajectory calculating program. This iteration calculation provides a first approximation to the profile. This profile can be used to predict observation of secondary ions, and observation of such ions provides a confirmation and cross check on the potential profile model found by the primary beam. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Numerical Model of Plasma Confinement

    Publication Year: 1976 , Page(s): 6 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (921 KB)  

    A time-dependent, zero-dimensional computer model with no adjustable parameters, for magnetically confined plasmas, is described. It predicts spatially averaged values of plasma density and electron and ion temperatures, and its predictions compare well with volume averaged measurements made in the Wisconsin Levitated Toroidal Octupole. The model is easily adaptable to predict scaling in other devices. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Kinetic Model for the Reactions of Co and H2 to CH4 and C2H2 in a Flow Microwave Discharge Reactor

    Publication Year: 1976 , Page(s): 11 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2524 KB)  

    A kinetic model was developed to describe the reactions of CO and H2 to CH4 and C2H2in a microwave plasma. The experimental system consisted of a 24 mm I.D. tubular quartz reactor which passed through a microwave cavity. A variable-incident power waveguide system could supply up to 800 watts of incident microwave power to the cavity. The reactant gas mixture of H2 and CO flowed through the reactor, where a plasma was maintained under pressures of 20 - 100 mm Hg. The reactor effluent was analyzed by IR spectroscopy for CH4 and C2H2. Conversions of up to 5.3% CO to C2H2 and 7.2% CO to CH4 were observed. A 26-reaction kinetic model was developed and fitted to the experimental data. The plasma reactor was modeled in two zones: a discharge zone where electron-impact dissociations produce H, C, and O, and a downstream recombination zone where the atomic species from the discharge recombine. The discharge zone was modeled as a well-mixed reactor, and the recombination zone was modeled as a plug-flow reactor. The model was able to explain the asymptotic shape of the observed conversion versus residence time data; the effect is due to a kinetic limitation. This also explains why the conversions obtained in the plasma cannot be predicted by thermodynamic equilibrium. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Landau Growth for Students Part I Initial Valuie Problem

    Publication Year: 1976 , Page(s): 24
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (186 KB)  

    This paper is internded to demonstrate to students that electron Landau growth of plasma waves is an easily understood and computed phenomenon. This derivation does not use the usual Fourier-Laplace transform technique with the inversion and final result being obtained by contour integration and residue theory. Instead, a simple treatment, following the original work of Vlasov, is used. Landau's original solution is recovered both for growth and decay, but only the growing part rigorously satisfies the initial assumptions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Landau Damping for Students Part II Boundary Value Problem

    Publication Year: 1976 , Page(s): 25 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    By setting the frequency ¿ in Vlasov's equation to a complex number, we have been able to remove the singularity in the integrand that has, in our own experience, caused our students so much trouble in the past. The resulting proper integrals are real, easily evaluated by elementary means, and yield correctly Landau's value for growth (and by extension, damping). The basic point in Justifying the derivation is that Landau damping for the student is no longer a mysterious phenomenon, obtained only via complex, contour integration, but an easily computed fact. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Flow and Temperature Fields in the Fire-Ball of an Inductively Coupled Plasma

    Publication Year: 1976 , Page(s): 28 - 39
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1725 KB)  

    A mathematical model is presented for the calculation of the two dimensional flow and temperature fields in an inductively coupled plasma. The model is based on the solution of the correcponding momentum, continuity and energy equations simultaneously with the one dimensional magnetic and electric field equations. Results were obtained for a plasma torch, 1.4 cm. radius, and 18.2 cm. long with a four turn induction coil, 2.4 cm. radius and 3 cm. The oscillator frequency was 3 MHz. Calculations were made for argon under atmospheric pressure at a power level of 3.77 KW with different plasma gas flow rate over the range of 5 to 25 gm/min. The results clearly demonstrate the existence of the magnetic pumping effect which is responsible for the formation of two recirculation eddies, one at each end of the coil. As the plasma gas flow rate is increased, the downstream eddy is swept away leaving only one recirculation eddy on the upstream side of the fire-ball. This eddy produces a back flow of the order of 20 m/s. Increasing the plasma gas flow rate is also observed to cause a substantial reduction of the heat flux to the plasma confining tube. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Resistive Electrostatic Ion Cyclotron Instability in Plasmas

    Publication Year: 1976 , Page(s): 40 - 44
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (914 KB)  

    The stability of electrostatic ion cyclotron waves propagating obliquely with respect to the background magnetic field is studied for collisional, fully-ionized plasmas in which there is a relative field-aligned streaming between electrons and ions. It is found that electron-ion collisions, in conjunction with electron streaming, provides a mechanism for instability. The role of electron streaming is to supply a source of free energy and the role of electron-ion collisions is to restrict the field-aligned mobility of the electrons, thus preventing them from establishing a Boltzmann equilibrium. Ion-ion collisions and finite ion Larmor radius are found to exert a stabilizing influence. The instability is analyzed for both current-carrying plasmas and counterstreaming-beam-plasma systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Role of Carbonaceous Particles in Low Current Arc Duration Enhancment. II. Arcs Occurring on Approach of Electrodes

    Publication Year: 1976 , Page(s): 45 - 50
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1023 KB)  

    Part per million concentrations of some organic vapors in telephone relay environments are known to produce carbonaceous particles on arcing contact surfaces. Enhanced arcing then occurs and the reliability and contact lifetime of the relays is impaired. The enhancement of break arcs due to the presence of carbonaceous particles has been described in paper I. Break Arcs.6 In this present paper the enhancement of arcs occurring on approach of electrodes (make arcs) is discussed and is thought to be due to the injection of plasmas formed by the electronic and ionic bombardment of carbon particles on the anode and cathode respectively. The plasmas formed from these particles can then be related to arc-duration enhancement. The observation that under `activated' conditions no anode-type arcs exist but those that form are all of the cathode variety, can also be explained by the model. A calculation of the amount of carbon required to fully activate a 10-2 cm2 contact area yields 6.3 × 10-8 gm in agreement with values of other workers. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Subnormal Glow Discharge Detection of Optical and Microwave Radiation

    Publication Year: 1976 , Page(s): 51 - 61
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3964 KB)  

    Commercial indicator lamp glow discharge tubes in the subnormal glow mode exhibit variable frequency tuned filter video response to optical and microwave radiation. Sensitivity to optical radiation can be particularly increased by using such devices in the subnormal rather than abnormal glow. These phenomena are discussed in terms of physical electronics and an equivalent circuit. A comparison is made of abnormal and subnormal glow mode properties. It is hoped that this model can lead to glow discharge lamp design for specific circuit applications involving subnormal glow mode characteristics. Relationships between glow discharge detector physical and electronic parameters are derived. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Relativistic Effect on Guided Wave Propagation through Isotropic Lossy Plasma

    Publication Year: 1976 , Page(s): 62 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1356 KB)  

    The dispersion relations and cut-off frequencies for the appropriate modes existing inside the relativistically moving lossy isotropic plasma waveguide are studied and are found to depend on waveguide dimensions, plasma-parameters and the drift velocity of plasma medium. The field as well as power flow are also studied in detail and it is found that the fields as well as power flow for TE modes are unchanged while for TM modes they are modified depending on the drift velocity of the plasma medium. The results are compared with those obtained for the case of lossless relativistically moving and lossy stationary plasma waveguides. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Production of a Large, Quiescent, Magnetized Plasma

    Publication Year: 1976 , Page(s): 66 - 68
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (341 KB)  

    This paper describes an experimental device which produces a large, homogeneous, quiescent, and magnetized plasma. Typical numbers as measured in an Argon plasma are: Size - 6 cm diameter × 100 cm length; Density - 108 to 1010 electrons/cm3; Electron temperature - 1 to 3 e. v.; Noise fluctuation - e¿f1/kBTe < 5%; Magnetic field - to 5 kG. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Scattering from a Bounded Plasma

    Publication Year: 1976 , Page(s): 69 - 71
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    The electromagnetic scattering from a bounded plasma column in a rectangular waveguide is investigated. Using image and boundary value techniques, equations are formulated for reflection, transmission and attenuation coefficients. Numerical results obtained from computations are in good agreement with results obtained using alternative formulations elsewhere. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Discrete Coil Torus with Lower Field Pipple

    Publication Year: 1976 , Page(s): 72 - 74
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    A new toroidal field coil configuration is desribed which allows one to reduce the volume of a toroidal field coil system or the number of coils constituting such a system without increasing the toroidal field ripple. View full abstract»

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

    Publication Year: 1976 , Page(s): 75 - 77
    Save to Project icon | Request Permissions | PDF file iconPDF (369 KB)  
    Freely Available from IEEE
  • Short Courses

    Publication Year: 1976 , Page(s): 78
    Save to Project icon | Request Permissions | PDF file iconPDF (207 KB)  
    Freely Available from IEEE
  • Publication Announcements

    Publication Year: 1976 , Page(s): 79
    Save to Project icon | Request Permissions | PDF file iconPDF (72 KB)  
    Freely Available from IEEE
  • IEEE Press Publishes Book on Technical Presentations

    Publication Year: 1976 , Page(s): 80
    Save to Project icon | Request Permissions | PDF file iconPDF (114 KB)  
    Freely Available from IEEE

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)