Study of the Compression Dynamics of a Fiber Liner with a Deuterated Target Mounted on the Axis
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MA DYNAMICS
Study of the Compression Dynamics of a Fiber Liner with a Deuterated Target Mounted on the Axis O. N. Abramova, V. V. Aleksandrovb, G. S. Volkovb, I. V. Volobuevс, E. V. Grabovskyb, A. N. Gritsukb, D. V. Zhigalova, Yu. G. Kalinind, V. D. Korolevd, *, Ya. N. Laukhinb, S. F. Medovshchikovb, K. N. Mitrofanovb,**, G. M. Oleinikb, E. A. Smirnovad, and I. N. Frolovb a Scientific
Research Institute of Chemistry and Technology of Organoelement Compounds, Russian Academy of Sciences, Moscow, 111123 Russia b Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow, 108840 Russia с Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia d National Research Center “Kurchatov Institute,” Moscow, 123182 Russia *e-mail: [email protected] **e-mail: [email protected] Received January 31, 2020; revised March 12, 2020; accepted March 26, 2020
Abstract—Compression of a fiber array with a deuterated target mounted on its axis is studied at the Angara5-1 facility (3.5 MA, 100 ns). Cylindrical arrays with an initial diameter of 12 mm made from polypropylene fibers with a diameter of 13.4 μm are used. The number of fibers varied from 30 to 120. The target with the density of 0.08–0.2 g/cm3 and the diameter of 1 mm was made on the basis of deuterated polyethylene. A 10-frame ultra-high-speed X-ray camera, optical slit scans, an integral X-ray pinhole camera, vacuum X-ray diodes, a crystal spectrograph, and neutron detectors are used to measure the plasma parameters in the Z-pinch. It is found that the dynamics of plasma compression and evolution of local plasma formations, which are sources of neutrons and soft X-ray emission in the energy range of E > 150 eV, depend on the load configuration: the number of fibers, diameter, and density of the deuterated target. Efficient compression of the liner plasma, high concentration and temperature of the compressed target state, as well as the highest neutron yield (8 × 109 neutron/pulse) are observed in experiments with arrays with the fiber number of 60, inside which the target with the diameter of 1 mm and density of 0.2 g/cm3 was placed. The electron density and temperature of the hot plasma in local formations are estimated as ne ≈ 1021 cm–3, Te ≈ 1 keV, respectively. The average neutron energy was 2.6 ± 0.2 MeV. The intensity of the plasma formation m [in μg/(cm2 ns)] of polypropylene fibers under the action of the discharge current of the facility is determined in experiments with fiber arrays. Keywords: plasma compression, deuterated target, Z-pinch, neutron yield, X-ray emission DOI: 10.1134/S1063780X20100013
1. INTRODUCTION In order to simulate the process of the plasma formation with thermonuclear parameters in the sausage of a Z-pinch from a DT mixture [1, 2], the dynamics of compression of condensed targets made of deuterated polyethylene (CD2) with a microheterogeneous structure (ρ = 0.05–0.1 g/cm3) by the magnetic field of mega-ampere current was studied at the S-300 (2 MA, 100 ns) and Angara-5-1 (3.5 MA, 100 ns) facilities [3–7]
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