Correlation between Plasma Dynamics and Emmision of Deuteron Beam, X-Rays and Neutrons in a Plasma Focus Discharge

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The correlation between the plasma dynamics and the emission of a deuteron beam, X-rays and neutrons in a plasma focus discharge was investigated experimentally. The dynamics were observed using interferometry in the streak mode and framing mode, and the energy distribution of the deuteron beam was measured using a Thomson parabola analyzer. The plasma column was partially disrupted by the m=0 instability. The deuteron emission started some tens of nsec before the disruption of the plasma column, while the X-ray and neutron signals started some Lens of nsec after the disruption. The m=0 instability was observed in each discharge even if neutrons were not produced. It is concluded that the acceleration field of the ion beam giving the neutron yield is generated not by a rapid change in the plasma inductance but by an abrupt rise in the resistivity of the plasma. The fine structure of the bubble formed in front of the current sheet propagating downstream was observed.
社団法人応用物理学会の論文
1984-02-20