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Plasma Science, IEEE Transactions on

Issue 2 • Date Apr 1992

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Displaying Results 1 - 10 of 10
  • Nonlinear waves in a rotating plasma cylinder

    Publication Year: 1992 , Page(s): 104 - 105
    Cited by:  Papers (1)
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    Previous work on exact cylindrical surface waves in a nonneutral cold-electron plasma bounded by a dielectric is extended to include plasma rotation. A set of nonlinear rate equations describing the temporal behavior of the system is derived by first determining an appropriate spatial wave structure. Physically relevant periodic solutions are obtained View full abstract»

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  • Bohm velocity with a two-temperature distribution of negative particles

    Publication Year: 1992 , Page(s): 62 - 65
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    A one-dimensional simulation of a low-pressure RF-driven discharge is used to verify the theoretical prediction of the Bohm velocity of ions at the sheath edge for a two-temperature electron distribution. Simulation results indicate that the Bohm velocity is geared to the cooler species, provided that it contains most of the electrons. A similar comparison is performed for an electronegative plasma View full abstract»

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  • Modulational instability of relativistic ion-acoustic waves in a plasma with trapped electrons

    Publication Year: 1992 , Page(s): 80 - 85
    Cited by:  Papers (3)
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    The association between the modified Korteweg-de Vries solitary wave and the modulationally unstable envelope solitary wave in a weakly relativistic unmagnetized plasma with trapped electrons is discussed. The effect of trapped electrons modifies the nonlinearity of the nonlinear Schrodinger equation and gives rise to the propagation of the modulationally unstable ion-acoustic solitary wave. The amplitude of the envelope solitary wave increases while the number of trapped electrons decreases. The velocity of the solitary wave decreases with increasing ionic temperature and increasing particle velocities. The ion oscillation mode, which satisfies the nonlinear dispersion relation, is also derived. The theory is applied to explain space observations of the solar energetic flows in interplanetary space and of the energetic particle events in the Earth's magnetosphere View full abstract»

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  • Low-pressure RF discharge in the free-flight regime

    Publication Year: 1992 , Page(s): 86 - 92
    Cited by:  Papers (6)
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    The self-consistent equations system for low-pressure RF discharge in the free-flight regime is formulated. The expressions for the electron energy diffusion coefficient due to electron-neutral collisions and to the electron collisions with the plasma-space charge moving boundary (stochastic heating) are derived. If the electron-neutral elastic collisions frequency exceeds the inelastic one, the conventional two-term approximation for the electron distribution function (EDF) can be generalized, and the space-time-averaged electron kinetic equation can be reduced to the one-dimensional energy diffusion one. The fast electrons attached to the electrode surface can also be accounted for in this equation. It is shown that in the cases of (a) spatially uniform ion profile, (b) for frequencies that are small compared with the electron bounce frequency, and (c) for frequencies exceeding the electron plasma one in the sheath, the stochastic heating vanishes View full abstract»

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  • Eddy current effects on plasma equilibrium in a single-turn tokamak

    Publication Year: 1992 , Page(s): 93 - 98
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    In a fusion experiment based on the single-turn tokamak concept, the plasma is surrounded by a massive conducting structure composed of several layers of material with different resistivities. This conducting shell is located near the plasma edge and is magnetically coupled to the plasma column. The plasma magnetohydrodynamic (MHD) equilibrium is studied by neglecting the effect of structural induced currents. Eddy current effects are then analyzed. Poloidal uniformization of the poloidal field magnet current distribution required for plasma equilibrium is demonstrated. The possibility of continuous-limiter discharges in a single-turn tokamak configuration is pointed out. The significance of these results for the operation of a high-current tokamak experiment is discussed View full abstract»

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  • The space-time-averaging procedure and modeling of the RF discharge II. Model of collisional low-pressure RF discharge

    Publication Year: 1992 , Page(s): 66 - 75
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (716 KB)  

    For pt.I see ibid., vol.19, p.130-40 (1991). A self-consistent equations system for the low-pressure RF discharge is formulated and qualitatively analyzed. If the plasma and sheath dimensions exceed the electron-energy relaxation length, a simple spatially averaged kinetic equation can be derived that resembles the conventional one for the local case. Since the energy-diffusion coefficient for the slow electrons that are trapped by the average electric field in the discharge center is small, the distribution function slope decreases significantly with the energy growth. Analytic estimates are derived and reasonable agreement with the experiments of Godyak (1976, 1979, 1986, 1990) is obtained View full abstract»

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  • Pressure dependence of the electrical potential and electron temperature in a microwave-generated plasma

    Publication Year: 1992 , Page(s): 57 - 61
    Cited by:  Papers (1)
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    The electron temperature in a stationary hydrogen plasma has been studied using a Langmuir probe. The measurements have been carried out over the pressure range from 3 mbar (2.25 torr) to 25 mbar (18.75 torr). The applied microwave power was varied from 50 to 450 W. The electron temperature shows a linear dependence on the applied microwave power. The self-space-charge field (in volts) of a hydrogen plasma shows a saturation behavior at higher microwave powers. The maximum value at the saturation of the field equals 6.8 V at a gas pressure of 15 mbar (11.25 torr) for all values of the input microwave radiation power. The polarities of the self-space-charge electric field are similar above this value and below it View full abstract»

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  • Charge state and residence time of metal ions generated from a microsecond vacuum arc

    Publication Year: 1992 , Page(s): 99 - 103
    Cited by:  Papers (3)
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    Metal ions generated from a microsecond vacuum arc were measured using a time-of-flight (TOF) method. A point-plane vacuum gap was fired by an impulse voltage to generate metal ions. The risetime and time constant for the decay of the arc current were 0.1 and 4.5 μs, respectively. TOF ion currents were measured for variable ion extraction times after the arc ignition. At a lead cathode, Pb+ and Pb ++ ions were detected for ion extraction times less than 45 μs. The average charge-state fractions of the Pb+ and Pb ++ ions were 91 and 9%, respectively. At a copper cathode, Cu +, Cu++, and Cu+++ ions were detected for ion-extraction times less than 12.5 μs, and the average charge-state fractions were 42, 41, and 17%, respectively. The residence times of the generated lead and copper ions were also discussed View full abstract»

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  • Switching characteristics of the triggered vacuum gap for a high-repetition-rate pulse-power source

    Publication Year: 1992 , Page(s): 76 - 79
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    Switching characteristics of sealed-off triggered vacuum gaps (TVGs) were examined from the viewpoint of a high repetition rate at high current discharge. With a triggered energy of 11 J, it was possible to fire the main gap in both the anode and cathode modes of operation. In repetitive discharge experiments, the TVG-tube was put in the center of the cylindrical conductor and the switching tube inductance was about 27 nH. The TVG-tube was confirmed to have capabilities for 1000 shots with a pulse current of 120 kA and a high repetition rate of 5 Hz. These experimental results indicated that the TVG-tube is a potential repetitive closing switch for the plasma X-ray source View full abstract»

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  • Measurements on electron beams in pulsed hollow-cathode discharges

    Publication Year: 1992 , Page(s): 53 - 56
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    Two different regimes of electron beams have been reported in the pulsed hollow cathode discharge-a low-current, high-energy beam, and a relatively high-current beam of low energy. The high-energy beam is related to the hollow cathode geometry and is found to be present even in the absence of subsequent gas breakdown, while the low-energy beam is always associated with voltage breakdown. Detailed measurements of the spatial and temporal distribution of the electron beam transported beyond a semitransparent anode associated with gas breakdown are reported. In particular, a high-energy component is observed after electrical breakdown. Low-energy electron beams are observed to be transported beyond the anode throughout the main discharge period 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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