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Correlation of current drop, filling gas pressure, and ion beam emission in a low energy Mather-type plasma focus device

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2 Author(s)
Behbahani, R.A. ; Department of Physics, University of Tehran, N. Kargar Ave., Tehran 14399, Iran ; Aghamir, F.M.

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The behavior of current drop and its correlation with ion beam emission during the radial phase of a high inductance low energy Mather type plasma focus device have been studied. The study includes two ranges of filling gas pressure, namely the low range of 0.2–0.8 mbar and the high range of 0.8–1.5 mbar. Two different current simulation processes were performed to aid the interpretation of the experimental results. Within the low range of operating pressure, an acceptable match between the computed and experimental current signals was achieved when the effects of anomalous resistances were contemplated. While in the high range of pressure, the computed and experimental current traces were in line even without considering the effects of anomalous resistances. The analysis shows that by decreasing the filling gas pressure the effects of instabilities are intensified. The computed and experimental current traces, along with ion beam signals gathered from a faraday cup, show that there is a strong correlation between the intensity of ion beam and its duration with the current drop during the radial phase.

Published in:

Journal of Applied Physics  (Volume:111 ,  Issue: 4 )