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19 Mar 2007

Volume 90, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 90, 123101 (2007); http://dx.doi.org/10.1063/1.2716242 (3 pages)

G. Z. Shen, Y. Bando, J. Q. Hu, and D. Golberg
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Extreme hydrogen plasma densities achieved in a linear plasma generator

G. J. van Rooij, V. P. Veremiyenko, W. J. Goedheer, B. de Groot, A. W. Kleyn, P. H. M. Smeets, T. W. Versloot, D. G. Whyte, R. Engeln, D. C. Schram, and N. J. Lopes Cardozo

Appl. Phys. Lett. 90, 121501 (2007); http://dx.doi.org/10.1063/1.2716208 (3 pages) | Cited 51 times

Online Publication Date: 23 March 2007

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A magnetized hydrogen plasma beam was generated with a cascaded arc, expanding in a vacuum vessel at an axial magnetic field of up to 1.6 T. Its characteristics were measured at a distance of 4 cm from the nozzle: up to a 2 cm beam diameter, 7.5×1020 m−3 electron density, ∼ 2 eV electron and ion temperatures, and 3.5 km/s axial plasma velocity. This gives a 2.6×1024 H+ m−2 s−1 peak ion flux density, which is unprecedented in linear plasma generators. The high efficiency of the source is obtained by the combined action of the magnetic field and an optimized nozzle geometry. This is interpreted as a cross-field return current that leads to power dissipation in the beam just outside the source.
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52.25.Xz Magnetized plasmas
52.50.Dg Plasma sources
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Vp Discharge in vacuum
52.25.Fi Transport properties

Modeling and simulation of the plasma absorption probe

M. Lapke, T. Mussenbrock, R. P. Brinkmann, C. Scharwitz, M. Böke, and J. Winter

Appl. Phys. Lett. 90, 121502 (2007); http://dx.doi.org/10.1063/1.2714202 (3 pages) | Cited 10 times

Online Publication Date: 23 March 2007

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The plasma absorption probe (PAP) was invented as an economical and robust diagnostic device to determine the electron density distribution in technical plasmas. It consists of a small antenna enclosed by a dielectric tube which is immersed in the plasma. A network analyzer feeds a rf signal to the antenna and displays the frequency dependence of the power absorption. From the absorption spectrum the value of the electron density is calculated. The original evaluation formula was based on the dispersion relation of plasma surface waves propagating along an infinite dielectric cylinder. In this letter the authors present the analysis of a less idealized configuration. The calculated spectra are in good qualitative agreement with their experimental counterparts, but differ considerably from those predicted by the surface wave ansatz. An evaluation scheme which takes our findings into account will improve the performance of the PAP technique further.
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52.70.Ds Electric and magnetic measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Fi Transport properties
52.40.Fd Plasma interactions with antennas; plasma-filled waveguides
52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
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