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18 Feb 2008

Volume 92, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 92, 073101 (2008); http://dx.doi.org/10.1063/1.2840574 (3 pages)

N. W. Gong, M. Y. Lu, C. Y. Wang, Y. Chen, and L. J. Chen
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Diagnostics for low-energy electrons in a two-frequency capacitively coupled plasma in Ar

M. Ishimaru, T. Ohba, T. Ohmori, T. Yagisawa, T. Kitajima, and T. Makabe

Appl. Phys. Lett. 92, 071501 (2008); http://dx.doi.org/10.1063/1.2844890 (3 pages) | Cited 11 times

Online Publication Date: 19 February 2008

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An experimental procedure to investigate the spatiotemporal characteristics of electrons in the vicinity of mean energy in a radiofrequency plasma is proposed by using optical emission and absorption spectroscopy in Ar. The method employs optical kinetics of long-lived metastable atom Ar(1s5) and short-lived excited Ar(2p9). The electron density distribution ne(z,t) is demonstrated in a typical condition in a two-frequency capacitively coupled plasma, excited at 100 MHz and biased at 500 kHz in pure Ar. The density shows almost time independent characteristics in the bulk plasma and a strong time dependence in the sheath in front of the bias electrode.
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52.70.-m Plasma diagnostic techniques and instrumentation
52.25.-b Plasma properties
52.80.-s Electric discharges
52.40.Kh Plasma sheaths

Intense-laser generated relativistic electron transport in coaxial two-layer targets

C. T. Zhou, X. T. He, and M. Y. Yu

Appl. Phys. Lett. 92, 071502 (2008); http://dx.doi.org/10.1063/1.2884334 (3 pages) | Cited 12 times

Online Publication Date: 21 February 2008

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The transport and heating of laser produced relativistic electron beam propagating through coaxial two-layer solid-density plasma are studied using two-dimensional hybrid fluid-particle-in-cell simulation. When the energetic electrons enter the plastic and copper target, stronger heating is observed in the plastic plasma. The heating of the plasma electrons and the formation of tens of million Gauss interface magnetic fields results from a large difference of the velocities of the returning electrons at the two sides of the interface. Moreover, the electron beam can have a completely different emittance behavior when the target consists of different-material layers.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.40.Mj Particle beam interactions in plasmas
41.75.Ht Relativistic electron and positron beams

Destruction of dimethyl methylphosphonate using a microwave plasma torch

Han S. Uhm, Soon C. Cho, Yong C. Hong, Yang G. Park, and Ju S. Park

Appl. Phys. Lett. 92, 071503 (2008); http://dx.doi.org/10.1063/1.2844859 (3 pages) | Cited 4 times

Online Publication Date: 21 February 2008

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A microwave plasma torch with a microwave power of 1.2 kW destroys dimethyl methylphosphonate (DMMP) with a destruction rate of 1.14 l/h, demonstrating a safe removal capability of stockpiled chemical weapons. The FTIR spectra of the discharge gas from DMMP destruction indicates near perfect elimination of DMMP when the proper amount of oxygen gas is added. This can be confirmed by the gas chromatography spectra, which show the disappearance of even intermediary compounds. The compactness and light weight of the microwave plasma torch provide an effective means of on-site removal of the chemical warfare agents found on a battlefield.
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52.75.Hn Plasma torches
89.20.Dd Military technology and weapons systems; arms control
78.30.-j Infrared and Raman spectra

Cross-talk in multiple dielectric barrier discharge actuators

H. Do, W. Kim, M. A. Cappelli, and M. G. Mungal

Appl. Phys. Lett. 92, 071504 (2008); http://dx.doi.org/10.1063/1.2885085 (3 pages) | Cited 4 times

Online Publication Date: 21 February 2008

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Phase locked particle image velocimetry (PIV) is used to study flow alteration by dielectric barrier discharge actuators mounted on a bluff body. Images from these PIV experiments confirm the importance of negative ions in the actuation process and demonstrate cross-talk interactions between adjacent actuators.
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47.85.ld Boundary layer control
47.80.Jk Flow visualization and imaging
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