Dynamics of Breakdown in a Low-Pressure Argon–Mercury Mixture in a Long Discharge Tube

Kalinin, Stanislav; Meshchanov, A. V.; Shishpanov, A. I.; Ionikh, Yu. Z.

doi:10.1134/s1063780x18030054

Cited by 9 publications

(20 citation statements)

References 26 publications

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“…For a negative wave, the values of E/N turned out to be approximately half that, which also agrees with [60]. For comparison, it can be noted that, in a steady-state discharge, E/N ≈ 1.2 Td [63].…”

Section: Radiation Spectrum Of An Ionization Wavesupporting

confidence: 76%

“…Figure 36 shows similar results for an Ar-Hg mixture (p Ar = 3 Torr, p Hg = 1 mTorr) in a tube 23 mm in diameter and 80 cm long [63]. The spectrum of the steady-state discharge in this mixture consisted only of mercury lines, which is not surprising due to the very low position of the levels of the Hg atom (E* ≈ 5 and 8 eV).…”

Section: Radiation Spectrum Of An Ionization Wavesupporting

confidence: 52%

“…5), and, in [55], the time course of the current through the high voltage cathode for the Ar-Hg mixture is demonstrated. More detailed and illustrative results were obtained in [63,64]. Figure 8 shows oscillograms recorded in the study of breakdown in a tube 80 cm long and 23 mm in the inner diameter in argon with mercury admixture at a total pressure of 3 Torr and a Hg vapor pressure of 1 mTorr with a grounded cathode and a ballast resistance of 20 kΩ.…”

Section: Electrical Signals In the Discharge Circuitmentioning

confidence: 96%

“…Although this effect is indeed eliminated, it is replaced with an effect of the shield. To determine the degree of this effect, experiments with conducting shields were carried out in [63][64][65]. The shields had the form of cylinders of various diameters: from 3 to 67 cm and a length equal to that of the discharge tube (80 cm).…”

Section: The Effect Of Shielding Of the Tube On The Breakdownmentioning

confidence: 99%

“…With smaller d s , the dependence is nonmonotonic. In [63], the following qualitative explanation was given. On the one hand, a decrease in d s , i.e., an increase in the capacitance C S , leads to an increase in the energy deposited in the primary discharge, which can lead to an increase in the initial velocity of the wave.…”

Section: The Effect Of Shielding Of the Tube On The Breakdownmentioning

confidence: 99%

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Electric Breakdown in Long Discharge Tubes at Low Pressure (Review)

Ionikh

2020

Plasma Phys. Rep.

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The review is devoted to studies of the processes and mechanisms of ignition of a glow discharge in tubes whose length significantly exceeds their diameter (long discharge tubes) at low pressures (~10 Torr and lower) and moderate voltage rise rates (~1 kV/μs and lower). The electric field in such tubes before a breakdown is substantially nonuniform. Therefore, a breakdown occurs after an ionization wave (or waves) passes through the discharge gap at a speed of ~105–107 cm/s. This makes the characteristics of the breakdown in long tubes significantly different from the breakdown between large and closely spaced electrodes, where the electric field is uniform before the breakdown and where the Townsend or, under strong overvoltage, streamer mechanism is realized. On the other hand, the nature of these processes is very different from those occurring in nanosecond discharges, which arise at voltages with a steepness of ~1 kV/ns and higher and are associated with high-speed (~109 cm/s) ionization waves. The review is based on the materials of experimental and computational works published from 1938 to 2020. Breakdown processes, optical and electrical characteristics of the discharge gap during breakdown, and the influence of the external circuit parameters and external actions (shielding and illumination by external sources of visible radiation) are analyzed.

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Section: Radiation Spectrum Of An Ionization Wavesupporting

confidence: 76%

Section: Radiation Spectrum Of An Ionization Wavesupporting

confidence: 52%

Section: Electrical Signals In the Discharge Circuitmentioning

confidence: 96%

Section: The Effect Of Shielding Of the Tube On The Breakdownmentioning

confidence: 99%

Section: The Effect Of Shielding Of the Tube On The Breakdownmentioning

confidence: 99%

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Electric Breakdown in Long Discharge Tubes at Low Pressure (Review)

Ionikh

2020

Plasma Phys. Rep.

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Modeling and experimental comparison of pulsed-DC driven low-pressure plasma discharge in a metal tube

Dezhi,

Pengli,

Xinyu

et al. 2024

Current Applied Physics

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Triggering of the breakdown in a discharge tube by visible-spectrum light pulses

Meshchanov¹,

Иванов²,

Ionikh³

et al. 2018

J. Phys. D: Appl. Phys.

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The influence of the pulses of visible-spectrum light on the breakdown in a discharge tube was studied experimentally. The tube of 80 cm length and 1.5 cm inner diameter contained neon at a pressure of 0.6 Torr. High-voltage rectangular or ramp pulses were applied to the anode. The light pulses of 0.1–100 µs duration were produced by the light-emitting diode or laser diode at a wavelength of 460 and 407 nm, respectively. A small area of the tube wall near the anode was illuminated at different moments after or before the voltage pulse onset. It has been found that the light pulse exerts the strongest influence on the breakdown. In the case of rectangular pulse, it drastically decreases the statistical delay time of the breakdown. As a result, all the breakdowns, which did not happen before the light pulse, occur during several microseconds after its onset. The light pulse influences the breakdown delay time even if it terminates before the voltage pulse onset. This can be explained by the finite lifetime of the secondary electrons produced by the light. In the case of the ramp voltage pulse, an essential decrease in the breakdown voltage scatter is observed under illumination. The effect is especially pronounced if the light pulse is applied at the moment when the anode voltage is equal to or somewhat lower than the minimum breakdown voltage. For later moments, the breakdown voltages are strictly bounded by both sides. The average breakdown voltage decreases noticeably. As for the mechanism responsible for the observed effect, electron photodesorption from the tube wall is suggested. This process presumably occurs in dielectric barrier discharge at atmospheric pressure where it can influence the breakdown voltage and provide synchronous breakdown of micro discharges, thus causing the formation of multiple filaments.

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Dynamics of Breakdown in a Low-Pressure Argon–Mercury Mixture in a Long Discharge Tube

Cited by 9 publications

References 26 publications

Electric Breakdown in Long Discharge Tubes at Low Pressure (Review)

Electric Breakdown in Long Discharge Tubes at Low Pressure (Review)

Modeling and experimental comparison of pulsed-DC driven low-pressure plasma discharge in a metal tube

Triggering of the breakdown in a discharge tube by visible-spectrum light pulses

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