Min Wug Moon

Vacuum ultraviolet luminous efficiency and plasma ion density in alternating current plasma display panels

The correlation between the vacuum ultraviolet (VUV) luminous efficiency and the plasma ion density has been investigated in terms of the xenon mole fraction in the neon filling gas for alternating current plasma display panels. The VUV luminous efficiency and plasma ion density are found to have strong correlation and to be saturated at xenon mole fractions greater than 7% and gas pressures of 400 Torr.

Influence of Insulator Length on the Downstream Electron Temperature and Density in the Coaxial Plasma Focus Device

We have generated the Ar plasma in the diode chamber based on the established coaxial electrode type and investigated the emitted visible light for emission spectroscopy. The optical emission spectrum data have been obtained for the focused plasma in the cylindrical diode chamber under the input voltage of 4.5 kV and pressure of 40 mtorr. We observed the nine emission lines of Ar II: 407.3, 410.6, 422.4, 426.8, 427.9, 435.0, 438.1, 444.5, and 488.0 nm. The downstream electron temperature and density have been measured by the Boltzmann plot and Stark broadening, respectively, from the assumption of local thermodynamic equilibrium. The length of the acrylic insulator has been changed to 30, 40, and 45 mm, respectively, which is covered on the inner cathode surface, to investigate the influence of insulator length on the downstream electron temperature and density in this experiment. Our results show that the downstream electron temperature and density of focused plasma are 2.5 eV and 1.6times1016 cm-3, respectively, for the coaxial plasma focus with cylindrical electrodes at the insulator length of 40 mm.

Corrections to “Influence of Insulator Length on the Downstream Electron Temperature and Density in the Coaxial Plasma Focus Device” [Jan 09 184-189]

In the above titled paper (ibid., vol. 37, no. 1, pp. 184-189, Jan 09), the superscript 6 in (3) is incorrect. The correct equation is presented here.

Spatiotemporal distribution of excited Xe density and electron temperature in alternating current plasma display panel by laser absorption and emission spectroscopy

Summary form only given. We have investigated the spatiotemporal behavior excited Xe atoms density in the 1s5 metastable states by laser absorption spectroscopy and electron temperature by emission spectroscopy, respectively, in accordance with various barrier ribs and xenon contents. The maximum density of excited Xe atoms in the 1s5 in discharge cell with stripe type and closed type barrier rib have been measured to be 1.28 x 1013 cm-3 and 1.45 x 1013 cm-3, respectively. In this experiment, the maximum value of excited Xe atoms density is not different much in different ribs. However, the distribution with spatiotemporal behavior is more uniform in the closed type barrier rib than stripe type rib. Throughout this experiment, we could understand influence of barrier rib and xenon contents on the excited xenon density and electron temperature in micro discharge cell.

Influence of insulator length on the electron temperature in the coaxial electrode of Plasma focus device

Summary form only given. We have generated the argon plasma in the diode chamber based on the established coaxial electrode type and investigated the emitted visible light for emission spectroscopy. We applied various voltages 2-3.5 kV to the device by 0.5 kV. and obtained the emission spectrum data for the focused plasma in the diode chamber on the diverse argon pressure. The Ar I and Ar Il emission line are observed. The electron temperature and ion density have been measured by the Boltzmann plot and Stark broadening from assumption of local thermodynamic equilibrium (LTE). We changed the length of insulator which is covered with the anode and cathode and measured the electron temperature on the its diverse insulator type. It can be shown that the electron temperature will be influenced by the insulator length in argon plasma with coaxial electrode.

Influence of insulator length on the downstream electron temperature and electron density in the coaxial electrode of plasma focus device

We have generated the Ar plasma in the diode chamber based on the established coaxial electrode type and investigated the emitted visible light for emission spectroscopy. It is applied to the input voltage 4.5 kV, and obtained the emission spectrum data for the focused plasma in the diode chamber on the argon pressure 40 mTorr. We observed the nine emission lines of Ar II ; 407.3 nm, 410.6 nm, 422.4 nm, 426.8 nm, 427.9 nm, 435.0 nm, 438.1 nm, 444.5 nm and 488.0 nm. The downstream electron temperature and electron density have been measured by the Boltzmann plot and Stark broadening from assumption of local thermodynamic equilibrium (LTE). The length of Acrylic insulator had been changed, which is covered in the cathode by the 30 mm, 40 mm and 45 mm, respectively, to measure the downstream electron temperature and electron density in the experience. The centered wavelength of Stark broadening was 444.58 nm. This experiment can be shown that the downstream electron temperature will be influenced by the insulator length in argon plasma with coaxial electrode. Our results show that the maximum downstream electron temperature and electron density are 2.5 eV and 1.6×1016 cm−3, respectively for the Our result have been appeared the maximum electron temperature of 2.50 eV and density of 1.6×1016 cm−3 for the plasma focus in coaxial electrode under the insulator length of 40 mm.

Measurement of electron temperature and plasma density in coplanar AC plasma display panels

The electron temperature and plasma density in coplanar alternating-current plasma display panels (AC-PDPs) have been experimentally investigated by a micro Langmuir probe and the high speed discharge images in this experiment. It is noted in this experiment that the electron temperature obtained from both the micro Langmuir probe and high speed ICCD camera decreases from 2.5 eV to 1.2 eV as the filling Ne+Xe gas pressure increases from 150 Torr to 350 Torr. It is noted that these electron temperatures are in good agreement with each other within 5% error limit. The plasma density at the lateral distance of 125 /spl mu/m away from the center of sustaining electrode gap has been found to be saturated from 0.73/spl middot/10/sup 11/ cm/sup -3/ to 7.54/spl middot/10/sup 11/ cm/sup -3/ at the Ne+Xe filling pressures ranged from 150 Torr to 350 Torr.

Plasma propagation speed and electron temperature in surface-discharged alternating-current plasma display panels

Summary form only given, as follows. The space and time-resolved discharge images from an alternating-current plasma display panels (ac-PDPs) has been observed by a high-speed single frame camera, and visualized as motion images. The time duration of the main discharge glow is. also shown to be about 200 ns and a faint light is continuously emitted even after 350 ns from the cathode in this experiment. It is found that glow occurs continuously at the cathode and striations are observed on the anode in a time duration between 100 ns and 300 ns of main discharge in ac-PDP. The propagation speed of surface-discharged plasma on the cathode has been measured to be 0.92 mm/

Output characteristics of the high-power microwave generated from a coaxial vircator with a bar reflector in a drift region

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Wall charge characteristics in accordance with square and ramped reset pulse in alternating current plasma display panels (AC-PDPs)

s and 1.34 mn/