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1 Feb 2010

Volume 96, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 96, 053107 (2010); http://dx.doi.org/10.1063/1.3280078 (3 pages)

Desalegne Teweldebrhan, Vivek Goyal, Muhammad Rahman, and Alexander A. Balandin
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Multiple diagnostics in a high-pressure hydrogen microwave plasma torch

J. Torres, J. J. A. M. van der Mullen, A. Gamero, and A. Sola

Appl. Phys. Lett. 96, 051501 (2010); http://dx.doi.org/10.1063/1.3306731 (3 pages)

Online Publication Date: 3 February 2010

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We present an experimental study of a hydrogen plasma produced by a microwave axial injection torch, launching the plasma in a helium-filled chamber. Three different diagnostic methods have been used to obtain the electron density and temperature as follows: The Stark intersection method of Balmer spectral lines (already tested in argon and helium plasmas); the modified Boltzmann-plot showing that the plasma is far from the local thermodynamic equilibrium but ruled by the excitation-saturation balance; and a study by the disturbed bilateral relations theory. All of these diagnostic techniques show a good agreement.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.75.Hn Plasma torches

High density conics in a magnetically expanding helicon plasma

C. Charles

Appl. Phys. Lett. 96, 051502 (2010); http://dx.doi.org/10.1063/1.3309668 (3 pages) | Cited 7 times

Online Publication Date: 3 February 2010

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A two-dimensional mapping of ion density and plasma potential in a diverging magnetized low pressure (0.4 mTorr) carbon dioxide helicon plasma containing a double layer reveals the presence of high density conics ( ∼ 7×109 cm−3) along the most diverging magnetic field lines exiting the helicon source and connecting with the grounded expansion chamber. The density in the conic is about 30% greater than the density at the double layer and this results from local ionization associated with the presence of a high energy tail in the electron energy probability function. The plasma potential along the conic is constant at about 30 V.
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52.25.Xz Magnetized plasmas
52.80.-s Electric discharges
02.50.Cw Probability theory
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