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13 Oct 2008

Volume 93, Issue 15, Articles (15xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 93, 151101 (2008); http://dx.doi.org/10.1063/1.2996271 (3 pages)

Xuefeng Zeng and Hongrui Jiang
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Heat flux characteristics in an atmospheric double arc argon plasma jet

Xin Tu, Liang Yu, Jianhua Yan, Kefa Cen, and Bruno Chéron

Appl. Phys. Lett. 93, 151501 (2008); http://dx.doi.org/10.1063/1.2998579 (3 pages) | Cited 2 times

Online Publication Date: 15 October 2008

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In this study, the axial evolution of heat flux excited by a double arc argon plasma jet impinging on a flat plate is determined, while the nonstationary behavior of the heat flux is investigated by combined means of the fast Fourier transform, Wigner distribution, and short-time Fourier transform. Two frequency groups (<1 and 2–10 kHz) are identified in both the Fourier spectrum and the time-frequency distributions, which suggest that the nature of fluctuations in the heat flux is strongly associated with the dynamic behavior of the plasma arc and the engulfment of ambient air into different plasma jet regions.
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52.25.Gj Fluctuation and chaos phenomena
52.70.-m Plasma diagnostic techniques and instrumentation
52.50.Dg Plasma sources
52.75.Hn Plasma torches
52.50.Nr Plasma heating by DC fields; ohmic heating, arcs

Small-signal gain theory of a nonrelativistic planar magnetron

Jing Zhou and Chiping Chen

Appl. Phys. Lett. 93, 151502 (2008); http://dx.doi.org/10.1063/1.2996577 (3 pages)

Online Publication Date: 16 October 2008

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A small-signal theory of a nonrelativistic magnetron is developed using a planar model with a thin electron cloud. The theory includes both inertial effects and electromagnetic effects in a Floquet expansion. An analytical dispersion relation of such a planar magnetron is derived, and the growth rate is calculated analytically. The found instability involves the resonance between the electron cloud and the magnetron cavity vacuum slow waves. A good agreement is found between the theory and the self-consistent particle-in-cell MAGIC simulations.
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84.40.Fe Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)

Observation of the inductive to helicon mode transition in a weakly magnetized solenoidal inductive discharge

Min-Hyong Lee and Chin-Wook Chung

Appl. Phys. Lett. 93, 151503 (2008); http://dx.doi.org/10.1063/1.2991292 (3 pages) | Cited 4 times

Online Publication Date: 16 October 2008

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A mode transition from an inductive mode to a helicon mode is observed in a solenoidal inductive discharge immersed in a weak dc magnetic field. The measured electron temperature and the plasma density at the reactor radial boundary show a sudden increase when the magnetic field strength reaches the critical value and the electron cyclotron frequency exceeds the rf driving frequency. These increases are due to the electron heating by the helicon wave. Such increases in the temperature and the density are not observed at the plasma center because the helicon wave cannot propagate to the center of the solenoidal type reactor unless the magnetic field is very high. These results show that the transition of the discharge from the inductive to the helicon mode occurs at the critical magnetic field strength.
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52.50.Dg Plasma sources
52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons
52.80.-s Electric discharges
84.32.Hh Inductors and coils; wiring
72.30.+q High-frequency effects; plasma effects

Effect of microwave frequency on breakdown and electron energy distribution function using a global model

Sang Ki Nam and John P. Verboncoeur

Appl. Phys. Lett. 93, 151504 (2008); http://dx.doi.org/10.1063/1.3003879 (3 pages) | Cited 6 times

Online Publication Date: 16 October 2008

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Global models (GMs) have proven a key modeling tool for the plasma processing field due to simplicity and speed. However, a GM requires specification of the electron energy distribution function (EEDF). The assumption of a Maxwellian EEDF leads to inaccurate reaction rate coefficients and results in error in plasma parameter prediction in high power microwave (HPM) driven discharges. Recently, a GM was developed with a pressure-independent enhanced EEDF to improve fidelity for modeling HPM breakdown. In this work, the GM is extended to 2 decades in frequency, and the frequency effect on HPM breakdown and the EEDF is investigated.
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52.80.Pi High-frequency and RF discharges
52.70.-m Plasma diagnostic techniques and instrumentation
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