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Plasma Science, IEEE Transactions on

Issue 1 • Date Feb 1992

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Displaying Results 1 - 7 of 7
  • Laser-induced fluorescent measurements of magnetic field contours in a low-pressure discharge

    Publication Year: 1992 , Page(s): 24 - 29
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    Faraday rotation of a laser beam and emission spectroscopy to resolve Zeeman splitting provide information about the plasma magnetic field, integrated along the line of sight. Information about the local magnetic field strength can be obtained using a dye laser tuned off the center of an atomic or ionic transition by an amount δλz. If the absorption linewidth of the transition probed is less than the Zeeman splitting, only those atoms/ions residing in a magnetic field where the Zeeman splitting is δλz will resonantly absorb energy from the laser and fluoresce. The feasibility of this magnetic field contour technique was studied in a low-pressure neon discharge. A conductor insulated from the discharge generated a large magnetic field in the discharge free of the Stark broadening effects associated with large plasma currents. The laser-induced fluorescence (LIF) intensity profile measured along the laser beams had peaks at those spatial locations where local magnetic fields, inferred from the conductor current, agreed with the Zeeman shifted wavelength of the laser View full abstract»

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  • A hydrodynamic model of vacuum arc plasmas

    Publication Year: 1992 , Page(s): 34 - 41
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (596 KB)  

    The properties of plasmas expanding from cathode spots of vacuum arcs are calculated with a one-dimensional two-fluid model. The system of simplified hydrodynamic equations can be solved under stationary conditions using asymptotic power series. Although necessarily only an approximation, such analytical solutions prove to be advantageous compared with numerical integrations. All the plasma parameters are functions of (I/r)2/5 (current, I: distance, r). The three forces accelerating the ions to high kinetic energies are quantitatively calculable: the electric field, the ion pressure gradient, and the electron-ion friction. The potential is decreasing towards the anode, and the residence of the plasma is negative. The ion temperature reaches only about 35% of the electron temperature. Although only asymptotic, the solution is suited to describe the arc plasma in a sufficient manner all over the expansion region View full abstract»

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  • Resonant mode analysis in toroidal cavities with elliptical cross sections

    Publication Year: 1992 , Page(s): 19 - 23
    Cited by:  Papers (1)
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    Resonant cavity modes in a torus with elliptical cross section are studied by means of a direct variational method. The nonlinear effects of toroidicity and ellipticity on the frequency of the basic mode are analyzed simply and systematically without the restriction of linear theory. It is shown that the toroidicity effect on the m=0 transverse magnetic mode is ⩽11%. The frequency of the mode shifts ~11-29% when the elongation of the cross section changes from 1 to 2. The effects of toroidicity and ellipticity differ for each resonant mode View full abstract»

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  • Closing/opening switch for inductive energy storage applications

    Publication Year: 1992 , Page(s): 42 - 46
    Cited by:  Papers (1)
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    A magnetically delayed vacuum switch operating sequentially in a closing mode and then in an opening mode enables the design of a compact electron-beam generator based on an inductive energy store and having only a single switch. Furthermore, the system can be entirely vacuum insulated, with no power feedthrough requiring low inductance or operating at high-impulse voltage levels. Feasibility of the unique power-switching configuration has been explored theoretically, experimentally, and computationally. In a proof-of-principle experiment, a voltage impulse twice the magnitude of the DC charge voltage was observed at a power level of 20 MW. A computational model of the experiment produced results consistent with the experiment, and furthermore, predicted the possibility of achieving much higher power levels in an optimally configured system View full abstract»

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  • Ion-acoustic solitons in an inhomogeneous multicomponent plasma with negative ions

    Publication Year: 1992 , Page(s): 13 - 18
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    Ion-acoustic solitary waves are studied in an inhomogeneous multicomponent plasma by the augmentation of a K-dV equation wherein a simple form of ionization has been taken to show its interaction in changing the salient features of the soliton, as compared to those observed in a homogeneous plasma. As expected, the negative ions in the plasma bring a drastic alteration on the ion-acoustic solitons, thereby establishing a new era by showing the solitary waves to be studied by a modified K-dV equation. The emphasis has been on determining how the ionization and density gradient in the inhomogeneous plasma affect the solitons View full abstract»

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  • Friction factor and wall heat transfer for laminar and turbulent flow in a cylindrical duct with a wall-stabilized arc

    Publication Year: 1992 , Page(s): 30 - 33
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    Friction factor and wall heat-transfer data for axially symmetric flow in a wall-stabilized arc analysis are given. Heat transfer results revealed three significant modes: laminar flow with an unstable arc, laminar flow with a wall-stabilized arc, and turbulent flow with a wall-stabilized arc. It was shown that the critical Reynolds number increases, in comparison with the case of the flow without Joule heating. A friction factor from Reynolds-number dependence peculiarities was not discovered for laminar to turbulent flow transition View full abstract»

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  • Soot elimination and NOx and SOx reduction in diesel-engine exhaust by a combination of discharge plasma and oil dynamics

    Publication Year: 1992 , Page(s): 1 - 12
    Cited by:  Papers (27)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (956 KB)  

    The soot in the exhaust gas from a 2-L diesel-engine car has been eliminated almost completely, independent of the load and cruising speed, by a plasma reactor mounted downstream of the engine exhaust and a novel technique using a combination of discharge plasma and oil dynamics. The NOx (NO2+NO) and SOx components have also been reduced by about 70% at a rotational speed of 1200 rpm and a load of 7 kg-m, corresponding to about 60% of maximum torque (about 11.4 kg-m at 1200 rpm). The reduction rate of NOx in this investigation is about 20% more efficient than ordinary treatment using a discharge plasma only 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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