Abstract
The results of experiments on increasing the specific energy density of high-current Z-pinch plasma by using various compression modes are presented. The experiments were carried out with cascade wire cylindrical loads at the Angara-5-1 facility with a current in the load of up to 4 MA. The experiments used loads both with a reduced inductance at the final stage of pinch compression and loads that make it possible to implement a transient compression mode from a cascade scheme to a composite Z-pinch scheme. When cascade arrays, which have a reduced inductance at the final stage of compression, are compressed, the specific power of soft X-ray emission is higher than 5 TW/cm, which corresponds to the radiation power with a pinch of a standard length of 1.6 cm at the level of 8–9 TW. The specific total X-ray emission yield is about 150 kJ/cm for a total emission yield at a level of 90–95 kJ. The compression dynamics of such a load indicates a significant role of the magnetic field of the current flowing through the inner cascade in the interaction of the cascades. It is shown that in the transient compression mode from a cascade array to a composite Z‑pinch, the outer array of a material with a relatively low atomic number (Al) provides a high kinetic energy flux density, while the inner array of a small diameter made from a material with a high atomic number (W) allows one to increase the radiation power three times.
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ACKNOWLEDGMENTS
We are grateful to the staff of the Angara-5-1 facility for technical support during the experiments.
Funding
This work was supported by the Russian Foundation for Basic Research (project no. 20-02-00133).
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Translated by L. Mosina
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Volkov, G.S., Grabovsky, E.V., Gritsuk, A.N. et al. Increasing the Specific Energy Concentration of High-Current Z-Pinch Plasma by Using Transient Compression Modes. Plasma Phys. Rep. 48, 337–345 (2022). https://doi.org/10.1134/S1063780X22040146
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DOI: https://doi.org/10.1134/S1063780X22040146