Comparison of Measured Neutron Yield Versus Pressure Curves for FMPF-3, NX2 and NX3 Plasma Focus Machines Against Computed Results Using the Lee Model Code

Saw, S. H. and Lee, P. and Rawat, R. S. and Verma, R. and Subedi, D. and Khanal, R. and Gautam, P. and Shrestha, R. and Arwinder, Singh* and Lee, S. (2015) Comparison of Measured Neutron Yield Versus Pressure Curves for FMPF-3, NX2 and NX3 Plasma Focus Machines Against Computed Results Using the Lee Model Code. Journal of Fusion Energy, 34 (3). pp. 474-479. ISSN 1572-9591

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Abstract

A range of plasma focus machines from the 200 J FMPF3 through the 2 kJ NX2 to the 20 kJ NX3 are operated at the National Institute of Education in Singapore. The neutron yield Yn versus pressure P curves for these machines have been measured and published. We use the Lee code to compute these Yn versus P curve for each machine after fitting a computed current waveform to a current waveform measured from each machine. Comparison of computed with measured Yn versus P curves show good agreement of peak Yn for the NX2 and NX3 whilst the measured peak Yn of FMPF3 is larger than the computed by a factor of 3. The computed curve is generally broader whilst the NX3 computed curve also shows a shift to higher pressures than the measured curve. The results are critically discussed.

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