Stimulated detonation of a high-energy heterogeneous plasma formation created by capillary erosive plasma generator and magneto- plasma compressor

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Abstract

Studying the physical properties of long-lived plasma formations can help us to understanding the nature of electro-physical phenomena in thunder clouds, the lower ionosphere, tornadoes, volcanic activity and the associated appearance of natural plasmoids (such as ball lightning, sprites, jets, etc.). The study of the stimulated detonation of long-lived energy-consuming plasmoids obtained in laboratory using a combined type plasma generator consisting of an erosive plasma generator and a magnetoplasma compressor is presented in this paper. It was found that a necessary condition for detonation is the excess of certain threshold values of pressure and temperature. The existence of a directed explosion mode has been established, which is realized only at optimal delay times (of the order of td ~ 2000 μs) between the beginning of a pulsed erosion discharge and the discharge of a magnetoplasma compressor. The parameters of shock waves, as well as the optical and X-ray spectra of long-lived energy-consuming plasmoids in the stimulated detonation mode were measured.

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About the authors

A. I. Klimov

Joint Institute for High Temperatures, Russian Academy of Sciences

Author for correspondence.
Email: klimov.anatoly@gmail.com
Russian Federation, Moscow

V. G. Brovkin

Joint Institute for High Temperatures, Russian Academy of Sciences

Email: klimov.anatoly@gmail.com
Russian Federation, Moscow

A. S. Pashchina

Joint Institute for High Temperatures, Russian Academy of Sciences

Email: klimov.anatoly@gmail.com
Russian Federation, Moscow

References

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Supplementary files

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2. Fig. 1. Electrical diagram and general view of the combined arrester MPC-EP: 1 – internal electrode (anode) of EP; 2 – capillary discharge channel of EP; 3 – arrester body; 4 – cathode of EP / anode of MPC; 5 – insulator; 6 – cathode flange of MPC, 7 – cathode rods of MPC; 8 – heterogeneous plasma jet (HPJ).

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3. Fig. 2. General view of the laboratory stand: 1 – combined arrester MPK-EP; 2 – pressure sensors; 3 – high-voltage probe P6015; 4 – capacitive storage device.

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4. Fig. 3. Frames of high-speed video recording of the evolution of the “plasma piston” created by the MPC-EP: the delay time between turning on the EP and the MPC is td~ 2000 μs, the frame rate is 125,000 fps, the frame exposure time is 0.2 μs. Frame 1 corresponds to the state of the EP plasma jet before turning on the MPC; frames 2–4 show the evolution of the plasma jet after turning on the MPC. Time moments t relative to the onset of the EP discharge: 1 – 1512 μs, 2 – 2024 μs, 3 – 2040 μs, 4 – 2056 μs.

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5. Fig. 4. Time evolution of pressure P2(t) behind the shock wave front, recorded by the pressure sensor: 1 – working mixture PMMA + TiHx, 2 – working mixture PMMA. Delay time between switching on the EP and the MPC – td ~ 2000 μs.

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6. Fig. 5. Optical emission spectra of the DEP: 1 – emission spectrum with injection of NiHx impurity, 2 – initial emission spectrum in the absence of impurity injection.

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7. Fig. 6. Typical spectrum of DEP radiation in the X-ray range.

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