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Parametric Optimisation of Plasma Focus Devices for Neutron Production

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Abstract

A large number of experimental investigations have been carried out on plasma focus devices especially at low energy level of several kJ or over 100 kJ. There are few machines operating in the middle energy range of 10–50 kJ, where the neutron yield typically in the order of 108–109 per shot. This paper reviews the optimisation process of two different plasma focus devices (12 kJ) by applying the Lee model code. The neutron yield (Y n ) versus pressure (P) curve for several configurations of the two plasma focus provided insight of geometrical optimisation. Measured discharge current is fitted as the first step of modelling to correctly simulate the plasma dynamics. Subsequently the code is used to simulate the neutron yield of the two plasma focus devices based on beam target mechanism. Good agreement between the computed results of neutron yield versus pressure and the measured yield versus pressure is found up to the pressure where highest neutron yield is obtained. Computed highest neutron yield for most of the configuration typically differ by a factor <2.

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Acknowledgments

This paper is dedicated to the meticulous work of the late Dr. Chen You Hor, which has contributed greatly to the progress of plasma focus work in Malaysia. The University of Malaya Plasma Focus Laboratory acknowledges the contribution of the Juelich I capacitor bank donated through the Alexander von Humboldt Foundation in connection with the AVH Research Fellowship awarded in 1975 to one of us (LS). This capacitor bank had contributed greatly to dense plasma studies in our Laboratory. The authors are thankful to the grant support from University of Malaya: UM.S/625/3/HIR/43 and Ministry of Education Grant FRGS: FP056-2010B.

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Correspondence to S. L. Yap.

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Lim, L.K., Yap, S.L., Lim, L.H. et al. Parametric Optimisation of Plasma Focus Devices for Neutron Production. J Fusion Energ 35, 274–280 (2016). https://doi.org/10.1007/s10894-015-0014-5

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  • DOI: https://doi.org/10.1007/s10894-015-0014-5

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