Theoretical and experimental study of inertial gases admixtures influence on the hard x-ray emission of plasma focus

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Dulatov, A.K.^1 ; Lemeshko, B.D.^1 ; Mikhailov, Yu.V.^1 ; Prokuratov, I.A.^1 ; Selifanov, A.N.^1

All-Russia Scientific Research Institute of Automatics, Luganskaya 9, Moscow

115304, Russia^1

关键词: Compression force;    Discharge currents;    Electron beam interaction;    Hard x-ray emission;    High current electron beams;    Induced electromotive force;    Multiply charged ions;    Positive charges;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012023/pdf
DOI  :  10.1088/1742-6596/653/1/012023

来源: IOP

【 摘 要 】

This paper studies the influence of inertial gases admixtures (Ar, Kr, Xe) to deuterium in plasma focus (PF) chambers. Experiments were realized in PF chambers with discharge currents of 350, 650 and 1000 kA. The measurements of the hard x-ray (HXR) emission were carried out by the scintillation detector SSDI38 with time resolution of 2.5 ns. Experiments show the existence of optimum amount of inertial gases, which corresponds with the atomic number of added gas. At the optimum amount of inertial gas and deuterium in PF chamber, the HXR yield rises up to 10 times in comparison with HXR yield only for deuterium filling. This work shows the dependence of HXR emission on PF device stored energy. The mechanism of inertial gases admixtures influence that leads to rise of HXR yield has been discussed. The mechanism concerns with different behavior of deuterium ions and ions of inertial gases during the pinch decay phase when the discharge current compression force has reduced. Inertial gas ions locate near the axis of the pinch and deuterium ions go to the near plasma area. Local positive charge in plasma forms on this axis because of multiply charged ions of inertial gases. Then electrons gather to the axis area and electron density increases. This electrons form high current electron beam under the influence of the induced electromotive force during the pinch decay phase. HXR emission is generated after the electron beam interaction with the anode target in PF chamber.