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Plasma Science, IEEE Transactions on

Issue 5 • Date May 2009

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Displaying Results 1 - 18 of 18
  • Table of contents

    Page(s): C1
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  • IEEE Transactions on Plasma Science publication information

    Page(s): C2
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  • Observation of Cathode-Spot Phenomena at the Surface of a Dielectric Powder-Covered Electrode in the Presence of a Background Plasma and Applied Magnetic Field

    Page(s): 637 - 646
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (981 KB) |  | HTML iconHTML  

    An electrode containing a layer of micrometer-sized ceramic powder was exposed to a low-pressure background argon plasma. Negative biasing of the electrode resulted in the formation of localized arcs which manifested attributes similar to that observed in vacuum cathode-spot discharges. The arcing action on the electrode in the presence of an applied magnetic field ejected particles and metal vapor, eventually etching repeatable tracks into the electrode surface. The regular tracks left by the action of the cathode spots on the electrode surface suggest J times B effects. The cathode-spot waveforms and erosion tracks with and without an applied magnetic field were documented using a fast frame rate camera and oscilloscope. View full abstract»

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  • Effect of Nano- to Millisecond Pulse on Dielectric Barrier Discharges

    Page(s): 647 - 652
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (604 KB) |  | HTML iconHTML  

    It has recently been demonstrated that pulsed direct-current (dc) voltages show better performance in generating diffuse plasmas under various conditions. However, it still remains unclear whether the pulsewidth or the rising and falling times of the voltage pulse play the essential role in the improvement of the performance of the dielectric barrier discharges (DBDs). In this paper, we focus on the effect of pulsewidth. Pulsed dc voltages with pulsewidth varying from 0.2 mus to about 1 ms are used to drive the DBDs. High-speed photographs show that diffuse Ar plasmas can be generated by pulsed dc voltages with pulsewidths covering the entire investigated range. It is found that the pulsewidths of the applied voltages affect the discharge current durations significantly when the pulsewidth is shorter than 600 ns or the break between the two consecutive pulses is shorter than 600 ns. View full abstract»

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  • Influence of Plasma Gas on the Quality-Related Properties of Wool Fabric

    Page(s): 653 - 658
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (317 KB) |  | HTML iconHTML  

    Plasma treatment affected the quality-related properties of wool fabric such as air permeability, pilling, tearing strength, tensile strength, crease-recovery angle, and surface luster which were studied thoroughly in this paper. The plasma gases with different natures were used, and the experimental results showed that the gas nature influenced the properties of air permeability, tearing strength, tensile strength, elongation, and crease recovery to different extent. In the pilling-resistance test, the antipilling property was improved but no definite conclusion was drawn to distinguish which of the plasma gases had the significant effect. The surface luster had no significant changes under the influence of plasma treatment. In addition, the low-stress mechanical properties related to fabric handle were also studied. A fabric objective measurement system, fabric assurance by simple testing, was used for measuring the low-stress mechanical properties such as extensibility, bending rigidity, shear rigidity, surface thickness, and formability. In the evaluation of the low-stress mechanical properties of the plasma-treated fabrics, the plasma treatment showed different effects on the extensibility, bending rigidity, shear rigidity, surface thickness, and formability. However, the overall results confirmed that the plasma treatment could alter the low-stress mechanical properties of the fabric. View full abstract»

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  • Polyethylene Terephthalate Surface Modification by Filamentary and Homogeneous Dielectric Barrier Discharges in Air

    Page(s): 659 - 667
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    In this paper, polyethylene terephthalate (PET) films are modified using nonequilibrium plasma generated by homogeneous dielectric barrier discharges (DBDs) in air at medium pressure, and the results are compared to those treated by using filamentary DBDs in air at atmospheric pressure. The characteristics of homogeneous DBDs are studied and compared with those of filamentary DBDs by measuring their electrical discharge parameters and observing their light-emission phenomena, and the surface properties of PET films before and after the treatments are studied using contact-angle and surface-energy measurements, X-ray photoelectron spectroscopy, and scanning electron microscopy. It is found that the homogeneous DBD is quite homogeneous and stable in the whole gas gap, which differs from the filamentary DBD, and the plasma treatments modify the PET surface in both morphology and composition. The PET films modified in both treatments show a remarkable decrease in water contact and a remarkable increase in surface energy due to both the introduction of oxygen-containing polar groups onto the surface and the improvement in surface roughness. It is found that the homogeneous DBD is more effective in PET surface modification than the filamentary DBD as it can make the contact angle decline to a lower level by introducing more oxygen-containing groups, and the possible reason for this effect is discussed. View full abstract»

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  • An RC Plasma Device for Sterilization of Root Canal of Teeth

    Page(s): 668 - 673
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (441 KB) |  | HTML iconHTML  

    The application of cold plasma in sterilization of a root canal of a tooth has recently attracted great attention. In this paper, a reliable and user-friendly plasma-jet device, which can generate plasma inside the root canal, is reported. The plasma can be touched by bare hands and can be directed manually by a user to place it into root canal for disinfection without causing any painful sensation. When He/O2(20%) is used as working gas, the rotational and vibrational temperatures of the plasma are about 300 K and 2700 K, respectively. The peak discharge current is about 10 mA. Preliminary inactivation experiment results show that it can efficiently kill enterococcus faecalis , one of the main types of bacterium causing failure of root-canal treatment in several minutes. View full abstract»

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  • Improvement of Luminance and Luminous Efficiency Using New Electrode Structures in AC Plasma Display

    Page(s): 674 - 677
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (754 KB) |  | HTML iconHTML  

    Two new electrode structures, namely, fence electrode (Fen) and combination of coplanar and fence electrodes (CoFen), employing an elevated bus electrode in the conventional surface discharge structure with three electrodes are suggested. In this paper, various comparisons between the conventional and two new structures are made to validate the effectiveness of the proposed structures. The firing and sustain voltages, displacement and discharge currents, cell capacitance, luminance, and luminous efficiency for three electrode structures are measured for various pressure ranges used in the conventional plasma displays. Consequently, the experimental results show that the CoFen structure has lower firing and sustain voltages than the conventional and Fen structures for all pressure ranges from 100 to 700 torr. In addition, the Fen structure realizes over 80% brighter and approximately 18% higher luminous efficiency than the conventional one. View full abstract»

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  • Surface Creepage of High-Voltage Self-Breakdown Gas Switch

    Page(s): 678 - 682
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (853 KB) |  | HTML iconHTML  

    In this paper, the surface creepage of high-voltage self-breakdown switch which is used in 500 kV pulse modulator is analyzed in theory by employing the method of distributed element equivalent recurrent circuit. Moreover, the field distortion of the connecting ring of the switch is simulated by using software. According to the theoretical analysis, several methods to avoid surface creepage are obtained: 1) the outer housing of the switch should have high surface resistivity; 2) when the surface breakdown electric field is a constant, it is better to decrease the diameter of the electrode and to increase outer diameter and thickness of the outer housing; 3) in order to avoid field distortion, it is recommended, as far as possible, not to use metal connecting ring on the outer housing of the switch; and 4) there should be a clean environment for switch to work. View full abstract»

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  • High-Speed and High-Accuracy Method of Mutual-Inductance Calculations

    Page(s): 683 - 692
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1062 KB) |  | HTML iconHTML  

    While Grover's tabular method to compute the mutual inductance of coaxial single-layer coils is convenient and fast when implemented on computer, its use has mostly been restricted to zeroth- and first-order calculations, since its accuracy is not well defined or quantified. This paper defines and quantifies the accuracy of Grover's tabular method for single-layer coaxial coils and shows that interpolation between the tabulated values is the primary factor limiting its accuracy. The results of this paper are used to develop an improved tabular-solution method that has accuracy approaching that of a finite-element field-code analysis. The analysis compares three mutual-inductance calculation methods for coaxial single-layer coils: a finite-element numerical method, an analytical method involving the numerical elliptic-integral evaluation, and Grover's tabular method. The finite-element numerical solution and the analytic solution are the most accurate and comparable to each other, while the tabular method is the least accurate. In terms of speed, however, the tabular method is the fastest while the finite-element method is the slowest. The interpolation techniques used in the analysis include cubic spline, cubic polynomial, polynomial, and linear. In comparison to finite-element numerical calculations, the improved tabular method developed in this paper decreases the computation time a factor of 4 times 103 while retaining an accuracy of at least four significant digits. The improved tabular method can be applied to similar-type problems that rely on the evaluation of elliptic integrals in their solution. View full abstract»

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  • A Generalized Criterion of Transition to the Diffuse Column Vacuum Arc

    Page(s): 693 - 697
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (413 KB) |  | HTML iconHTML  

    The high-current diffuse column arc in vacuum consists of a bright central column of plasma, with some number of individual cathode spots burning on the remainder of the contact surface. The arc voltage imposed by the main column alters the plasma expansion and current flow of single jets burning alongside the column. Stable existence of the displaced single jets drives the transition into the high-current diffuse mode. The new model assumes that the displaced single jets are confined along the magnetic field, which is a combination of a self-magnetic field and an axial magnetic field. Azimuthal self-magnetic field leads to increase in the effective length of the jet path between two contacts. The longer effective length leads to higher critical voltage below which single jets can stably exist without a source of additional plasma. This produces conditions favorable to single-jet stability. A generalized criterion for single-jet existence is presented. View full abstract»

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  • Monte Carlo Simulation of Surface-Charging Phenomena on Insulators Prior to Flashover in Vacuum

    Page(s): 698 - 704
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (662 KB) |  | HTML iconHTML  

    Before flashover across an insulator under high electric field in vacuum, there are charging phenomena occurring on the insulator surface, which significantly affect the developing process of flashover. Based on the secondary-electron-emission-avalanche model and by using the Monte Carlo method, a 2-D analysis of surface charge density on cylindrical and conical insulators prior to flashover in vacuum has been performed under unipolar voltage. Different materials are employed, i.e., alumina ceramic, PTFE, PMMA, and PI. The influences of materials, voltage amplitudes, and coning angles on charge distribution are investigated. The results reveal that negative charges exist in a small surface region near the cathode, while the surface charges positive in a larger region away from the cathode. With increasing applied voltage, both the negative charge density and region decrease, and even vanish, whereas both the positive charge density and region increase, and the peaks of both regions move toward the cathode. For the conical insulator with a negative angle, the positive charge density is greater than that with a positive angle, and the simulation describes well experimental data relating the coning angle, the surface charge, and the flashover voltage. View full abstract»

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  • Special issue for invited papers from the 36th International Conference on Plasma Science 2009

    Page(s): 705
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  • Special issue on z-pinch plasmas

    Page(s): 706
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  • Special issue for Selected Paper from the 23rd Symposiium on Fusion Engineering (SOFE 2009)

    Page(s): 707
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    Page(s): 708
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  • IEEE Transactions on Plasma Science information for authors

    Page(s): C3
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  • Affiliate Plan of the IEEE Nuclear and Plasma Sciences Society

    Page(s): C4
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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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Editor-in-Chief
Steven J. Gitomer, Ph.D.
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