Collision of Two Plasma Diffuse Jets with the Same and Different Front Polarity at an Air Pressure of 1 Torr

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Abstract

In air at a pressure of 1 Torr, the mode of collision of diffuse plasma jets (PDJs) consisting of ionization waves — red streamers have been studied. PDJ were formed in a quartz tube by a capacitive discharge from two identical generators with pulses of positive and negative polarity. It has been established that, with the same polarity of voltage pulses, counter-current PDJs suppress each other’s radiation. It is shown that for different polarity of voltage pulses, the intensity of the glow in the region where the PDJ meets increases significantly. Data are presented on the effect of delays between switching on generators of different polarity on the emission spectra of PDJ. It has been established that with an increase in air humidity, an atomic hydrogen line Ha appears in the emission spectrum, as well as OH and OH+ bands, the spectral energy density (W) of some of which is commensurate with the W bands of the second positive (2+) nitrogen system. The velocity of the PDJ front was measured when two generators of different polarity were turned on.

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About the authors

V. F. Tarasenko

Institute of High-Current Electronics, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: VFT@loi.hcei.tsc.ru
Russian Federation, Tomsk

N. P. Vinogradov

Institute of High-Current Electronics, Siberian Branch of the Russian Academy of Sciences

Email: VFT@loi.hcei.tsc.ru
Russian Federation, Tomsk

E. H. Baksht

Institute of High-Current Electronics, Siberian Branch of the Russian Academy of Sciences

Email: VFT@loi.hcei.tsc.ru
Russian Federation, Tomsk

D. S. Pechenitsin

Institute of High-Current Electronics, Siberian Branch of the Russian Academy of Sciences

Email: VFT@loi.hcei.tsc.ru
Russian Federation, Tomsk

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2. Fig. 1. Schematic diagram of the experimental setup for studying PDS collisions initiated by a capacitive discharge, which had a front of both the same polarity and opposite polarity. 1 - quartz tube; 2 - high-voltage electrode connected to generator U1 and voltage divider (R2-R3); 3 - electrode grounded through shunt R1 and connected to generator U1; 4 - electrode grounded through shunt R1* and connected to generator U2; 5 - high-voltage electrode connected to generator U2 and voltage divider (R4-R5)

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3. Fig. 2. Current and voltage pulses at switching on two generators of negative (U1) and positive (U2) polarity without delay between voltage pulses (a), with delays ≈ 1.25 (b) and ≈ 1.85 μs (c), as well as at switching on one generator U1. Air pressure p = 1 Torr, pulse repetition rate f = 21 kHz. |U1| ≈ |U2| ≈ 7 kV

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4. Fig. 3. Photographs of PDS (see corresponding oscillograms for them in Fig. 2a), which are shown after correction of image brightness and contrast (a) and without correction (b), as well as a photograph of PDS without image correction, which is obtained by switching on one generator U2 with positive polarity (c). The designations 1-5 correspond to the caption of Fig. 1. 6 - AKTAKOM dividers. Exposure of the photographs is 0.25 s. Air pressure p = 1 torr, pulse sending frequency f = 21 kHz. Polarity of the generator U1 is negative, U2 is positive. |U1| ≈ |U2| ≈ 7 kV

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5. Fig. 4. Photographs of PDS initiated by capacitive discharge between electrodes 2 and 3 from generator U1 and between electrodes 4 and 5 from generator U2, obtained in the mode with voltage pulses of the same positive polarity without image brightness and contrast correction at exposure 0.25 s (a), as well as after two levels of image correction of the same photograph (b) and (c). 2 and 5 are high-voltage electrodes, 3 and 4 are grounded electrodes. The arrows show the locations of the light guides from the spectrometer and the FES. C1 - between electrodes 3 - 4 at a distance of 33 cm from the right edge of electrode 3 and the left edge of electrode 4; C2 - at a distance of 50 cm from the right edge of electrode 3 and 16 cm from the left edge of electrode 4; C3 - in the centre between electrodes 4-5. The light guides collected radiation from a region of the tube width 1, the rest of its part was covered by a black screen. Air pressure p = 1 Torr, f = 21 kHz. U1 ≈ U2 ≈ +7 kV

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6. Fig. 5. PDS emission spectra from the region between electrodes 4 and 5, marked by arrow C3 in Fig. 4. 4, at different polarity of the generators and their simultaneous start (a), as well as at a delay in switching on the generator U1 by 1.25 μs (b). 2+ - the region of the spectrum with the most intense bands of the second positive nitrogen system, including 337.1 and 315.9 nm; 308.2 and 312.6 nm - maxima of the bands of OH+ and OH molecules with red shading; Hα - the line of atomic hydrogen with a wavelength of 656.3 nm, 1+ - the region of the spectrum with the most intense bands of the first positive nitrogen system. Air pressure p = 1 Torr, U1 = -7 kV, U2 = +7 kV. Exposures 3 s (a) and 20 s (b)

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7. Fig. 6. PDS emission spectrum from the C1 region between electrodes 3 and 4 at different generator polarity and generator U1 switch-on delay of 830 ns (a), as well as current and voltage oscillograms for this mode (b). 2+ - the region of the spectrum with the most intense bands of the second positive nitrogen system; 308.2 and 312.6 nm - bands of OH+ and OH molecules with red shading; Hα - the line of atomic hydrogen with a wavelength of 656.3 nm, 1+ - the region with the most intense bands of the first positive nitrogen system. Air pressure p = 1 Torr, U1 = -7 kV, U2 = +7 kV. Exposures 20 s (a)

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8. Fig. 7. Oscillograms of the voltage pulse U with generator +U2 and radiation powers P1, P2, and P3, which were registered by the FES when two generators (-U1 and +U2) of different polarity were switched on, respectively, from the regions C1, C2, and C3 (see Fig. 4a). Fig. 4a) (a), as well as the maximum radiation powers P1, P2, and P3 from regions C1, C2, and C3, respectively, with simultaneous switching on of two generators (-U1 and +U2) - 1, (+U1 and +U2) - 3, and one (-U2) - 2 (b). The numbers 1, 2 and 3 are shown on the abscissa axis. Air pressure p = 1 Torr, f = 21 kHz. |U1| ≈ |U2| ≈ 7 kV

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