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3 Jun 2002

Volume 80, Issue 22, pp. 4085-4270

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Plasma chemistry fluctuations in a reactive arc plasma in the presence of magnetic fields

Johanna Rosén, André Anders, and Jochen M. Schneider

Appl. Phys. Lett. 80, 4109 (2002); http://dx.doi.org/10.1063/1.1483128 (3 pages) | Cited 4 times

Online Publication Date: 23 May 2002

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The effect of a magnetic field on the plasma chemistry and pulse-to-pulse fluctuations of cathodic arc ion charge state distributions in a reactive environment were investigated. The plasma composition was measured by time-of-flight charge-to-mass spectrometry. The fluctuation of the concentrations of Al+, Al2+, and Al3+ was found to increase with an increasing magnetic field strength. We suggest that this is caused by magnetic field dependent fluctuations of the energy input into cathode spots as seen through fluctuations of the cathode potential. These results are qualitatively consistent with the model of partial local Saha equilibrium and are of fundamental importance for the evolution of the structure of films deposited by reactive cathodic arc deposition. © 2002 American Institute of Physics.
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52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.25.Gj Fluctuation and chaos phenomena
52.27.Jt Nonneutral plasmas

Modification of laser energy deposition in a gas of deuterium clusters

D. R. Symes, A. J. Comley, J. W. G. Tisch, and R. A. Smith

Appl. Phys. Lett. 80, 4112 (2002); http://dx.doi.org/10.1063/1.1483129 (3 pages) | Cited 8 times

Online Publication Date: 23 May 2002

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The modification of energy deposition by a 70 fs laser pulse focused to an intensity of 1017 W cm−2 in a medium of deuterium clusters with mean atomic density of 1019 cm−3 has been investigated using short-pulse interferometry. A low-power (<1015 W cm−2) beam propagating transverse to the heating beam was used to destroy clusters in the low-density wings of the medium prior to the arrival of the main heating pulse. Images of the plasma channels produced by the heating beam show that the transverse beam can strongly modify the spatial deposition of laser energy. Using this effect, we have demonstrated a 15-fold enhancement of energy coupling to the densest regions of the cluster medium. © 2002 American Institute of Physics.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
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