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15 Jan 2008

Volume 103, Issue 2, Articles (02xxxx)

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Characterization of plasma waves in gated two-dimensional electron systems

Koichi Narahara and Yuta Suzuki

J. Appl. Phys. 103, 023301 (2008); http://dx.doi.org/10.1063/1.2826909 (4 pages) | Cited 1 time

Online Publication Date: 16 January 2008

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The characteristics of plasma waves in gated two-dimensional electron gas systems are discussed. We numerically discuss the effect of the intrinsic nonlinearity of plasma waves on their propagation. Moderate nonlinearity results in the development of solitons, as suggested by [ Govorov et al., JETP Lett. 70, 488 (1999) ]. In addition, backward-traveling pulses develop when the degree of nonlinearity becomes large.
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52.70.-m Plasma diagnostic techniques and instrumentation
52.35.Sb Solitons; BGK modes
52.25.Fi Transport properties

Electron dynamics and acceleration study in a magnetized plasma-filled cylindrical waveguide

Sandeep Kumar and Moohyun Yoon

J. Appl. Phys. 103, 023302 (2008); http://dx.doi.org/10.1063/1.2831223 (7 pages) | Cited 3 times

Online Publication Date: 16 January 2008

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In this article, EH01 field components are evaluated in a cylindrical waveguide filled with plasma in the presence of external static magnetic field applied along the direction of the mode propagation. The electron acceleration inside the plasma-filled cylindrical waveguide is investigated numerically for a single-electron model. It is found that the electron acceleration is very sensitive to the initial phase of mode-field components, external static magnetic field, plasma density, point of injection of the electron, and microwave power density. The maximum amplitude of the EH01 mode’s field components is approximately 100 times greater than the vacuum-waveguide case for operating microwave frequency f = 7.64 GHz, plasma density n0 = 1.08×1017 m−3, initial phase angle ϕ0 = 60°, and microwave power ∼ 14 MW in a cylindrical waveguide with a radius of 2.1 cm. An electron with 100 keV gets 27 MeV energy gain in 2.5 cm along the waveguide length in the presence of external power ∼ 14 MW with a microwave frequency of 7.64 GHz. The electron trajectory is also analyzed under the effects of magnetic field when the electron is injected in the waveguide at r = R/2.
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52.40.Fd Plasma interactions with antennas; plasma-filled waveguides
52.25.-b Plasma properties
84.40.Az Waveguides, transmission lines, striplines

Roles of oxidizing species in a nonequilibrium atmospheric-pressure pulsed remote O2/N2 plasma glass cleaning process

Masahiro Iwasaki, Yuto Matsudaira, Keigo Takeda, Masafumi Ito, Eiji Miyamoto, Takuya Yara, Tsuyoshi Uehara, and Masaru Hori

J. Appl. Phys. 103, 023303 (2008); http://dx.doi.org/10.1063/1.2830982 (7 pages) | Cited 11 times

Online Publication Date: 17 January 2008

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Atmospheric pressure plasma treatments have attracted attention for various application processes. The effect of O2 additions below 0.2% to N2 was investigated for the efficiency of removing organic contaminants on a glass surface using nonequilibrium atmospheric-pressure pulsed plasma. A remarkably high efficiency of cleaning was obtained by a plasma treatment with ca. 0.03% O2 additions to N2. The concentration of ozone (O3) and the ground-state oxygen radical [O(3P2)] were measured using ultraviolet absorption spectroscopy and vacuum ultraviolet laser absorption spectroscopy, respectively. It was found that the key factors for surface cleaning were the scission of carbon bonds due to ultraviolet irradiation and subsequent oxidation due to O(3P), and that the surface cleaning proceeded in broad areas due to the photodissociation of O3.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.77.Bn Etching and cleaning
81.65.-b Surface treatments

Dependence of electron peak current on hollow cathode dimensions and seed electron energy in a pseudospark discharge

S. O. Cetiner, P. Stoltz, P. Messmer, and J.-L. Cambier

J. Appl. Phys. 103, 023304 (2008); http://dx.doi.org/10.1063/1.2832507 (9 pages) | Cited 3 times

Online Publication Date: 18 January 2008

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The prebreakdown and breakdown phases of a pseudospark discharge are investigated using the two-dimensional kinetic plasma simulation code OOPIC™ PRO. Trends in the peak electron current at the anode are presented as function of the hollow cathode dimensions and mean seed injection velocities at the cavity back wall. The plasma generation process by ionizing collisions is examined, showing the effect on supplying the electrons that determine the density of the beam. The mean seed velocities used here are varied between the velocity corresponding to the energy of peak ionization cross section, 15 times this value and no mean velocity (i.e., electrons injected with a temperature of 2.5 eV). The reliance of the discharge characteristics on the penetrating electric field is shown to decrease as the mean seed injection velocity increases because of its ability to generate a surplus plasma independent of the virtual anode. As a result, the peak current increases with the hollow cathode dimensions for the largest average injection velocity, while for the smallest value it increases with the area of penetration of the electric field in the hollow cathode interior. Additionally, for a given geometry an increase in the peak current with the surplus plasma generated is observed. For the largest seed injection velocity used a dependence of the magnitude of the peak current on the ratio of the hole thickness and hollow cathode depth to the hole height is demonstrated. This means similar trends of the peak current are generated when the geometry is resized. Although the present study uses argon only, the variation in the discharge dependencies with the seed injection energy relative to the ionization threshold is expected to apply independently of the gas type. Secondary electrons due to electron and ion impact are shown to be important only for the largest impact areas and discharge development times of the study.
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52.80.-s Electric discharges
52.65.-y Plasma simulation
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