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Plasma Science, IEEE Transactions on

Issue 5 • Date Oct. 2003

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Displaying Results 1 - 15 of 15
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  • Three-dimensional modeling of a surface type alternating current plasma display panel cell: the effect of cell geometry on the discharge characteristics

    Publication Year: 2003 , Page(s): 1023 - 1031
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB) |  | HTML iconHTML  

    Three-dimensional fluid code was used to investigate the effects of discharge cell's geometrical parameters on the characteristics of the addressing and the sustaining discharges. The main parameters investigated in this study are the cell pitch, the address electrode width, and the barrier rib height. The investigated discharge characteristics are the sustain voltage range, the luminance and efficiency, and the minimum applied voltage needed for the successful addressing. In this study, it was found that a larger cell pitch or a higher barrier rib can lower the sustain voltage range and a wider address electrode can lower the addressing voltage. Also, we obtained that the luminance and efficiency dependence on the sustain voltage for various values of each parameter. Especially for the analysis of the barrier rib height effect, we developed a ray-optics code where the luminance and efficiency can be calculated in terms of the visible light. From this analysis, we found that although cells with a higher barrier rib generate more VUV photons, there exists an optimal barrier rib height for a given cell pitch that gives the highest visible luminance and efficiency because of the shadow effect by the barrier ribs. View full abstract»

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  • Analysis of collisional sheath structure in an argon DC discharge

    Publication Year: 2003 , Page(s): 1032 - 1037
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    The electric fields of the sheath region in an argon DC discharge were measured using a laser optogalvanic spectroscopy in a pressure range from 0.88 to 10 torr, where collisions are significant in the sheath region. The sheath width is estimated as the position where the electric field becomes zero, and the pressure dependence of the measured sheath width was obtained to be (pressure)-13/. The measured electric fields agree well with two-dimensional simulation results but are slightly different from collisional sheath theory in the mobility limited region. The discrepancy of the theory from the experiment and simulation results was found to be caused by the change of ion current density due to ion collisions in the sheath region. View full abstract»

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  • Determination of the equilibrium ion sheath in the drifting plasma by numerical Simulation

    Publication Year: 2003 , Page(s): 1044 - 1051
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (413 KB)  

    A one-dimensional (1-D) particle-in-cell (PIC) numerical method is developed to determine the equilibrium steady-state sheath width established in a drifting plasma. The simulated and measured steady-state sheath widths are in approximate agreement although the measured width is slightly larger than the simulated. The probe is biased to +90 V and this greatly influences the potential structure within the sheath boundary. The simulation shows that the mean-charge state and mean-atomic-mass approach to dealing with multiple ion species with a range of charge states does not accurately predict the position of the equilibrium sheath when the difference between the charge-to-mass ratios of the ion species is large. A more robust approach is to simulate the steady sheath by a 1-D-PIC method that can handle multiple ion species. In experimental situations where the sample stage is finite in size, the assumption that the equilibrium ion sheath expands from a biased plate of infinite extent may be violated. A two-dimensional PIC numerical method expressed in r-z cylindrical coordinates has been developed to investigate the condition where the 1-D assumption becomes inaccurate. The results confirm that the 1-D-PIC method becomes inaccurate when the steady-state sheath width has dimensions comparable with the sample stage diameter. View full abstract»

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  • Dispersion characteristics of a rectangular waveguide grating

    Publication Year: 2003 , Page(s): 1075 - 1082
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (979 KB)  

    We study the dispersion characteristics of a rectangular waveguide grating for microwave amplifier applications. The Floquet theorem and an appropriate standing waves expansion is employed to express the fields in the vacuum region and inside the grooves, respectively. The application of the boundary conditions leads to an infinite system of equations, which is solved numerically by truncation. The main advantage of the procedure employed is that it gives directly and with a few spatial harmonics the dispersion relation. Furthermore, an adequate procedure (simulation tool) has been introduced in order to distinguish the real roots from spurious solutions and it has been found to work effectively for all cases presented in this work. Numerical results are presented for both shallow and deep grooves and comparison with previously published works is made. View full abstract»

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  • Comparison of electric field and priming particle effects on address discharge time lag and addressing Characteristics of high-Xe content AC PDP

    Publication Year: 2003 , Page(s): 1083 - 1090
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (901 KB) |  | HTML iconHTML  

    The alternating current plasma display panel (AC PDP) is generally driven by the subfield method to realize the gray scale, and each subfield is composed of reset, address and display period. Therefore, a significant time should be allocated to an address period in high-resolution PDP, which results in a short display period and a reduction of brightness, and so the dual scan method has been widely used to solve this problem. In this case, however, the address electrodes need to be physically divided into two parts and driven by different data drive integrated circuits (ICs), thereby causing a cost up due to doubling the number of data drive ICs. In this paper, we investigate the factors that could influence the address discharge time lag and, in particular, the electric field effects and priming particle effects are compared in order to achieve high speed addressing. In this regard, the address characteristics of high-Xe content panel are investigated from which it was found that the address discharge time lag was reduced to one half that of the conventional method when the priming particles are provided. View full abstract»

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  • Mechanism of high luminous efficient discharges with high pressure and high Xe-content in AC PDP

    Publication Year: 2003 , Page(s): 1038 - 1043
    Cited by:  Papers (59)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB) |  | HTML iconHTML  

    The mechanism of high luminous efficiency discharges with high Xe content in an AC plasma display panel was analyzed by computer simulation using a two-dimensional fluid model. The model has reproduced well the experimental results. The high luminous efficiency with high Xe content is attributed to high electron heating efficiency as well as high excitation efficiency by electron. The electron heating efficiency is increased with increasing the sustaining voltage under high Xe content and this phenomenon was analyzed by investigating the cathode sheath and secondary electron emission characteristics. View full abstract»

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  • Analysis of a metallic reflector grating with the influence of the Joule loss taken into account

    Publication Year: 2003 , Page(s): 1070 - 1074
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (359 KB) |  | HTML iconHTML  

    Reflection characteristics of metallic waveguide gratings with rectangular grooves are investigated with the effect of the Joule loss taken into account. For this purpose, the scattering matrix for each step discontinuity is first found by using the mode-matching method with an impedance boundary condition at the surface of the conductor. Then, the scattering matrix for the overall waveguide grating is obtained by generalized transfer matrix methods. Numerical results show that Joule loss occurs mainly at horizontal wall sections. In order to suppress the loss of a reflector grating, it is shown that it should have a deep grating depth with a small number of periods. This configuration coincides with that for a compact and wideband reflector grating, which can well support single-mode operation, as was pointed out in our previous work. View full abstract»

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  • Propagation velocity of pulsed streamer discharges in atmospheric air

    Publication Year: 2003 , Page(s): 1091 - 1094
    Cited by:  Papers (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (708 KB) |  | HTML iconHTML  

    Pulsed streamer discharges have been extensively used in many applications such as control of NOX and SO2 from exhaust gases, treatment of dioxins, removal of volatile organic compounds, generation of ozone, and laser excitation. An operation with a high energy efficiency is necessary for practical applications. It is very important to know the propagation mechanism of streamer discharges in order to improve the energy efficiency of pulsed discharge systems. In this paper, the emission from pulsed streamer discharges in a coaxial electrode system in air at 0.1 MPa was observed using a high-speed gated intensified charge-coupled display camera. A concentric wire-cylinder electrodes configuration was used. A positive pulsed voltage having a width of about 100 ns was applied to the central electrode. The streamer discharges were initiated at the inner electrode and terminated at the outer electrode. The propagation velocity of the streamer discharges was 1.8-3.3 mm/ns. View full abstract»

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  • Tracking down the origin of arc plasma Science-II. Early continuous discharges

    Publication Year: 2003 , Page(s): 1060 - 1069
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (883 KB) |  | HTML iconHTML  

    Continuous discharges could only be obtained after enduring energy sources became available, namely in the form of a battery of electrochemical cells, invented by Volta in late 1799. Humphry Davy is often credited with the discovery of the arc discharge, which later led to the development of the carbon arc lamp. Indeed, as early as 1800, he obtained short pulsed arcs with his Voltaic pile. Independently, and earlier than Davy in the sense of continuous discharges, the Russian Vasilii Petrov of St. Petersburg made carbon arcs in 1802. Petrov used a pile of 4200 electrochemical cells to drive what was the most powerful discharge at that time. Petrov's publication of 1803 appeared only in Russian, and his work was ignored and forgotten for over a century. Davy pursued highly successful electrochemical experiments and was unaware of Petrov's work. He increased the size of his battery in several steps, which led to increasingly powerful discharges, most likely an undesired side effect. After 1808, using the new battery of the Royal Institution, Davy demonstrated continuous arc discharges. The exact dates and circumstances of early arc demonstrations around 1810 are still the subject of research, but later arc experiments such as those at the London Institution of 1821 are well documented. While Petrov could claim priority for continuous carbon arcs, it was Davy who made a lasting impact on further development. View full abstract»

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  • Millimeter-wave materials processing in Japan by high-power gyrotron

    Publication Year: 2003 , Page(s): 1010 - 1015
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (581 KB) |  | HTML iconHTML  

    This paper summarizes recent research activities on materials processing using millimeter-waves in Japan with emphasis on the work performed at the Joining and Welding Research Institute (JWRI), Osaka University. Extensive research results conducted at the JWRI on ceramics sintering and modification of thin film properties with millimeter-wave radiation from a 28-GHz gyrotron are described. In the sintering of pure Al2O3, it was found that at a similar density and grain size a big difference in the bending strength appeared in the sample after millimeter-wave sintering as compared with that after conventional sintering. This result was attributed to come from the difference in the grain boundary structures due to the unique millimeter-wave effect. We have also obtained highly dense sintered Si3N4 and Aluminum Nitride (AlN) by the millimeter-wave method with new sintering aids containing Yb2O3 at a temperature lower by about 200°C-400°C than that by the conventional method. It was verified that selective heating of Yb2O3 by millimeter-waves around the grain boundary promoted a densification process in its liquid phase. A high thermal conductivity of 210 W/m·°C could be obtained in AlN samples sintered at 1700°C for 180 min in N2+ 3% H2 gas environment. In the research of thin-film modification the millimeter-wave irradiation to SrTiO3 films prepared by mirror-confinement-type electron cyclotron resonance (MCECR) plasma sputtering method could drastically improve their crystallinity and electrical properties at remarkably lower temperatures than by the conventional thermal methods. The crystallization temperature of amorphous films on Si substrates were 300°C and the dielectric constant reached to about 260. View full abstract»

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  • Potential for Thomson scatter with an X-ray laser

    Publication Year: 2003 , Page(s): 1016 - 1022
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (595 KB) |  | HTML iconHTML  

    The authors present an analysis of an X-ray laser Thomson scatter experiment attempted at the Rutherford-Appleton Laboratory. Although the experiment was for technical reasons not completed, an analysis of the feasibility is instructive. X-ray lasers are potentially a useful source for this type of experiment as they have high brightness, short pulse duration, and low divergence. Thomson scatter has proved to be a powerful diagnostic technique in low density plasmas and the extension of this diagnostic technique to shorter wavelengths in the XUV region would allow probing of plasmas at higher densities where classical plasma models such as the Debye-Huckel model breakdown. The authors show in their analysis that, at current output levels, self-emission may hamper attempts to probe high-density plasmas. However, a range of interesting plasmas can be probed which would be too optically thick for optical probing. View full abstract»

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  • Critical analysis of matching schemes in capacitively coupled discharges

    Publication Year: 2003 , Page(s): 1100 - 1102
    Cited by:  Papers (2)
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    It is shown that, in capacitively coupled radio frequency discharges, the amplitude of the discharge current may not have a unique value for a matching network designed to yield the maximum power transfer. The condition, which may lead to this uncertainty, is derived to avoid the possible, undesired mode of operation. View full abstract»

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  • Measurement of secondary electron emission yields

    Publication Year: 2003 , Page(s): 1095 - 1099
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (474 KB) |  | HTML iconHTML  

    The authors describe a method for the measurement of secondary electron emission coefficients and demonstrate the use of this approach for the measurement of secondary electron yields for titanium, copper, and carbon ions incident upon an aluminum target. The method is time-resolved in that a series of measurements can be obtained within a single ion beam pulse of several hundred microseconds duration. The metal ion beams were produced with a vacuum arc ion source, and the ratio of secondary electron current to incident ion current was determined using a Faraday cup with fast control of the electron suppressor voltage. The method is relatively simple and readily applied and is suitable for measurements over a wide parameter range. The secondary yields obtained in the present work are of relevance to the measurement of ion current and implantation dose in plasma immersion ion implantation. View full abstract»

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  • Tracking down the origin of arc plasma science I. Early pulsed and oscillating discharges

    Publication Year: 2003 , Page(s): 1052 - 1059
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (557 KB) |  | HTML iconHTML  

    The early development of arc plasma physics is closely related to the development of suitable sources of electrical energy. The harnessing of electrostatic charge in Leyden jars (early capacitors) enabled the controlled production of sparks and pulsed arcs. A contemporary introduction to sparks and arcs gives the foundation for critically assessing the early development, when observation and discovery of phenomena were still far from understanding. The modern development of discharge physics can be traced back to the 18th century. Notably, and generally unnoticed by the scientific community until today, Joseph Priestley observed cathode erosion and film deposition of cathode material as early as 1766. 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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