Experimental study of the processes accompanying argon breakdown in a long discharge tube at a reduced pressure

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

doi:10.1134/s1063780x16100068

Cited by 15 publications

(30 citation statements)

References 29 publications

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“…Obviously, at a finite rise rate of the interelectrode voltage, a decrease in the breakdown delay must lead to a decrease in the breakdown potential, according to relationship (1). This effect during breakdown in long tubes was studied in [86] (nitrogen), [87,88] (argon), and [89] (argon with an admixture of nitrogen). Figure 19 shows the voltage waveforms at the high-voltage anode during breakdown in nitrogen in a tube 40 cm long and 28 mm in diameter.…”

Section: The Memory Effect Of the Discharge Gapmentioning

confidence: 99%

“…The latter can also inferred from the disappearance of the scatter of U b in the region τ < 300 ms. In [86,88], estimates are given that imply that the observed effect in nitrogen can be explained by the processes on the electrode surface and the tube wall, suggested in [69]: ion-electron emission and heterogeneous recombination of N atoms accompanied by electron emission; in argon, they can be explained by the presence of electrons remaining in the anode region after the previous pulse.…”

Section: The Memory Effect Of the Discharge Gapmentioning

confidence: 99%

“…In [86][87][88], the following explanation of the causes of the anomalous memory effect is suggested. When the duration of the interval between pulses is small, the breakdown in the second pulse occurs under conditions of a high bulk and surface concentration of charged particles remaining after the previous discharge.…”

Section: The Memory Effect Of the Discharge Gapmentioning

confidence: 99%

“…In [65,71,88,98], the effect of illumination on the dynamic breakdown voltage U b in long tubes filled with He [71,98], Ar [71,88,98], Ne, or an Ar-Hg mixture [65,98] at a pressure of 1-5 Torr was studied. The breakdown was initiated by high voltage pulses with a steepness of dU/dt up to ~10 kV/ms or with a leading edge described by Eq.…”

Section: Initiation Of Breakdown By Visible Radiationmentioning

confidence: 99%

“…The value of t s is determined by the production rate of "effective" electrons (formula (3)). The question of possible mechanisms of electron emission under irradiation was discussed in [65,66,71,72,88]. The authors of [71] and then of [72] considered as such a mechanism optically stimulated exoelectronic emission (OSEE).…”

Section: Initiation Of Breakdown By Visible Radiationmentioning

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: The Memory Effect Of the Discharge Gapmentioning

confidence: 99%

Section: The Memory Effect Of the Discharge Gapmentioning

confidence: 99%

Section: The Memory Effect Of the Discharge Gapmentioning

confidence: 99%

Section: Initiation Of Breakdown By Visible Radiationmentioning

confidence: 99%

Section: Initiation Of Breakdown By Visible Radiationmentioning

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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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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On the slow ionization waves forming the breakdown in a long capillary tube with helium at low pressure

Akishev¹,

Алексеева²,

Karalnik³

et al. 2022

J. Phys. D: Appl. Phys.

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The results of studies of an electrical breakdown leading to the glow discharge ignition in a long capillary quartz tube are presented. Under such conditions, the breakdown completion is preceded by the development of direct, backward, and counter slow ionization waves traveling in the tube. The initiation of the waves was created in helium at low pressure (P=10 Torr) by the high-voltage pulses of positive and negative polarity with amplitude of several kilovolts. In the beginning, the regime without the breakdown completion in the tube was studied. In this regime, the propagation of only direct positive and direct negative ionization waves happens. The research on dynamics of the direct, backward, and counter positive and negative waves followed by a complete breakdown was done as well. The influence of the pre-existing plasma on the ionization waves propagation was also studied. The plasma was created in advance by low-current glow discharge being formed in the tube. The instant images of ionization waves were correlated with the electrical currents formed by the waves, that is, with the displacement current through the dielectric wall and the conductive current through the plasma column. In the experiments, the fine-sectioned electrode wrapped around the lateral tube surface was used. The usage of such electrode allowed one to study the dynamics of the surface charge deposition and deletion happening during the direct and backward wave propagation, respectively. Finally, a strong difference in the spatial structure and velocity of positive and negative direct waves traveling through non-ionized gas was revealed. Contrary, both the positive and negative backward waves traveling through the plasma formed by previous direct waves have the parameters close to each other.

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Experimental study of the processes accompanying argon breakdown in a long discharge tube at a reduced pressure

Cited by 15 publications

References 29 publications

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

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

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

On the slow ionization waves forming the breakdown in a long capillary tube with helium at low pressure

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