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Plasma Science, IEEE Transactions on

Issue 1 • Date March 1975

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Displaying Results 1 - 8 of 8
  • Table of contents

    Publication Year: 1975 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Transactions on Plasma Science

    Publication Year: 1975 , Page(s): c2
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  • Theory of Microwave Emission by Velocity-Space Instabilities of an Intense Relativistic Electron Beam

    Publication Year: 1975 , Page(s): 1 - 5
    Cited by:  Papers (30)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (988 KB)  

    The stability of waveguide modes in a waveguide along which is propagated an unneutralized, intense beam of relativistic electrons guided by an applied axial magnetic field is considered. It is found that the waveguide mode can interact unstably with the beam by resonating with the Doppler shifted cyclotron frequency of the beam. This instability appears to be the mechanism by which microwaves are produced in some recent experiments which are discussed. View full abstract»

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  • Hot Ion Plasma Heating Experiments in SUMMA

    Publication Year: 1975 , Page(s): 6 - 14
    Cited by:  Papers (2)
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    Initial empirical results are presented for the hot-ion plasma heating experiments conducted in the new SUMMA (Superconducting Magnetic Mirror Apparatus) at NASA Lewis Research Center. A discharge was formed by applying a radially inward DC electric field near the mirror throats. Data were obtained at midplane magnetic flux densities from 1.0 to 3.5 tesla. Charge-exchange neutral particle energy analyzer data were reduced to ion temperatures using a plasma model that included a Maxwellian energy distribution super-imposed on an azimuthal drift, finite ion orbits, and radial variations in density and electric field. Using this plasma model, the highest ion temperatures computed were 5 keV, 1.2 keV, and 1 keV for He+, H2+, and H+, respectively. These were obtained at a mid-plane magnetic flux density of 1.6 T. Ion temperature was found to scale roughly as (P/B)n, where P/B is the ratio of power input to magnetic flux density and n is about 1 for hydrogen and 2 for helium. Optical spectroscopy line-broadening measurements yielded ion temperatures about 15 percent higher than the charge-exchange neutral particle analyzer results for hydrogen and about 50 percent higher for helium. Spectroscopically obtained electron temperatures ranged from 3 to 30 eV. View full abstract»

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  • A Theoretical Prediction of the Observed Plasma Heating in the Compression Experiment at Ito's Group at Osaka University

    Publication Year: 1975 , Page(s): 15 - 17
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    A simple, model-independent description of the compression experiment of Ito's group at Osaka University predicts the observed plasma heating and final plasma ß to within a factor of two. View full abstract»

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  • Investigation of a Drifting Plasma Containing Negative Ions by Cylindrical Langmuir Probe Ion Mass Spectrometer

    Publication Year: 1975 , Page(s): 18 - 22
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    The study of drifting plasma in the laboratory or the ionsphere is not a straightforward problem because of the many variables such plasma will encounter. The presence of negative ions will add to the complication due to the detachment mechanism and other physical processes. It is not easy to separate the negative ion current component from the electron current component. To study negative ion population and mass spectra in the lower ion-sphere the value of the mean free path ¿ and the Debye shielding radius ¿o of the medium should be taken into consideration together with the collision frequency of the different charged particles. Cylindrical Langmuir probes have been used successfully as dianostic techniques for the drifting plasma. A cylindrical probe of suitable radius in relation to ¿ and ¿o was chosen. The probe was swept by a composite wave-form which contained a sawtooth sweep and two audio -frequency signals. The experiment was flown on board a stabilised rocket "Centaure" at high latitudes at Norway. The outputs yielded information about : 1. The first derivative of the current i with respect to the applied probe voltage -V 2. Percent modulation from which d2 i/dv2 was obtained. The second derivative is a function of the energy distribution function of the charged particles. The negative ion Gaussian peaks of energy are easily detached on the energy distribution function graph from those of thermal electrons. View full abstract»

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  • A Corrugated Mirror-Cyclotron Frequency Direct Conversion System (COMI-CYFER)

    Publication Year: 1975 , Page(s): 23 - 30
    Cited by:  Papers (2)
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    In this scheme the plasma escaping from a mirror machine is split into an array of long narrow beams by means of a grid of iron slabs. For proper shaping of the slabs, the increased mirror ratio at the iron causes acceptably low beam interception. After spherical expansion of the magnetic field containing the escaping plasma, the electrons are repelled by non-intercepting grids. A spatially alternating electric and/or magnetic field which follows is converted to an alternating or rotating force by the motion of the ions. At sufficiently low velocity, this force resonates with the cyclotron frequency and sweeps the ions to collector plates. With average ion energies of 293 keV an efficiency of 85% can be obtained in a system whose size is much smaller than other proposed direct conversion systems. For a 74% efficienicy, only 186 keV ions are required and the system becomes extraordinarily compact. View full abstract»

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  • Editor's Note

    Publication Year: 1975 , Page(s): 31
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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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Steven J. Gitomer, Ph.D.
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