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The effect of helium impurity addition on current sheath speed in argon-operated plasma focus using a tridimensional magnetic probe

Published online by Cambridge University Press:  14 June 2013

N. PANAHI ,
M. A. MOHAMMADI ,
S. HEDYEH  and
R. S. RAWAT
N. PANAHI
Affiliation:
Department of Physics, Islamic Azad University, Bandar Abbas Branch, P.O. Box 79159-1311, Bandar Abbas, Iran
M. A. MOHAMMADI
Affiliation:
Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Tabriz, Iran (mohammadidorbash@yahoo.com) Research Center of Astrophysics and Applied Physics, University of Tabriz, Tabriz, Iran
S. HEDYEH
Affiliation:
Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Tabriz, Iran (mohammadidorbash@yahoo.com)
R. S. RAWAT
Affiliation:
Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore
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Abstract

Using the tridimensional magnetic probe, the current sheath velocity at 0.25 Torr is studied in Sahand, a Filippov-type plasma focus facility. The current sheath velocity in argon-filled plasma focus with different percentages of helium impurity at different operating voltages was studied. The highest average current sheath velocity of 12.26 ± 1.51 cm μs−1 at the top of the anode in the axial phase was achieved at 17 kV. Minimum average current sheath velocity is 5.24 ± 1.18 cm μs−1 at 12 kV with 80% argon + 20% helium as a working gas. The full width at half-maximum of peaks of the magnetic probe was found to be inversely related to the current sheath velocity, i.e. smaller at higher voltages for different impurity and decreased with increasing of impurity.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 867 - 871
Copyright
Copyright © Cambridge University Press 2013 

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