Pulsed Nanosecond Breakdown of Vacuum Gaps

Mesyats, G.; Proskurovsky, D.I.

doi:10.1007/978-3-642-83698-5_4

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…An inductance L 0 in figure 1 presents summarized electrical inductance of the capacitor, the spark gap and the current carrier sheets, except for the inductance of the SGD cavity. Table 1 summarizes the construction parameters of two setup modifications, where τ s is the spark gap commutation time constant [14][15][16][17]. The power supply source of the first setup modification was constructed of ceramic capacitors, while in the second setup modification the power supply chain elaborated earlier [9] and based on the extremely low-inductance film-oil capacitor was applied.…”

Section: Experimental Setup and The Modelmentioning

confidence: 99%

“…where U 0 is the charge voltage, U s the spark gap voltage drop, I (t) the total discharge current and R N , L N represent the approximations of equivalent values of the instant discharge resistance and inductance, respectively, h = h + r. As compared with [13], system (3) is added by the last equation, which represents the commutation characteristics of the spark gap [14][15][16][17], where ϕ is a constant depending on the initial conditions at t = 0. Introduction of the last equation into ( 3) is explained by the following.…”

Section: Experimental Setup and The Modelmentioning

confidence: 99%

“…Introduction of the last equation into ( 3) is explained by the following. The voltage steepness on a load is known to depend on the characteristics of a current commutator [14][15][16][17][18]. The parameters of the latter one were not described in the experiments of [1,2] and, thus, could not be accounted in the calculations of [13].…”

Section: Experimental Setup and The Modelmentioning

confidence: 99%

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Dynamics of multichannel and quasi-homogeneous sliding discharge formation in rare gases

Trusov

2007

J. Phys. D: Appl. Phys.

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Results of experiments with Ne, Ar and Xe as well as computer simulations are presented, aimed at testing an earlier proposed model of temporal dynamics of multichannel structure development in a pulsed high-current sliding gas discharge. The obtained and discussed experimental data include the values of an averaged channel radius, the pulsed near-surface breakdown voltage, the saturated spark resistance, the spatial structure of spark channels registered photographically under different discharge voltages and the oscilloscope traces of the discharge gap voltage. The experiments were performed at two values of gas pressure (30 and 100 kPa) with a setup in two modifications which differed from each other by an impedance (27 times) and a stored electric energy (250 times) of a pulsed power supply source. A comparison of the experimental channel structure and the discharge voltage time dependence with those calculated using the discussed model showed good agreement, and this approves an application of the model to quantitative estimations of the sliding discharge parameters. The relation revealed between the channel radii and the square root of mobility of electrons is explained by a drift of electrons in a transverse electric field. Attention is also paid to the problem of stability of a multichannel mode of the sliding discharge. Both experimental data and computer modelling demonstrate that the most stable mode of the discharge is a quasi-homogeneous one, in which the spark channels fill the interelectrode gap entirely. But a certain instability of plasma brightness seems to be an intrinsic feature of the multispark sliding discharge even in its quasi-homogeneous mode, which results from non-simultaneous initiation of the spark channels.

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Section: Experimental Setup and The Modelmentioning

confidence: 99%

Section: Experimental Setup and The Modelmentioning

confidence: 99%

Section: Experimental Setup and The Modelmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of multichannel and quasi-homogeneous sliding discharge formation in rare gases

Trusov

2007

J. Phys. D: Appl. Phys.

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“…Results of our measurements are supported by the PIC/MCC results obtained including field emission effects (crosses). On the other hand, they have the same tendencies as experimental data taken from [39] (right yellow triangles) and differences between them are attributed to dissimilar experimental conditions such as materials, shapes and geometry of the electrodes. We also found that experimental data can be fitted to the pd dependence:…”

Section: Resultsmentioning

confidence: 58%

“…During field emission, an electron tunnels out of a material primarily due to the electric field. The field emission current density j is determined by the transmission coefficient D of the barrier [39]:…”

Section: Field Emissionmentioning

confidence: 99%

The breakdown voltage characteristics of compressed ambient air microdischarges from direct current to 10.2 MHz

Klas

Moravský

Matejčík

et al. 2017

Plasma Sources Sci. Technol.

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This paper presents the results of the experimental and simulation studies of the breakdown characteristics of microdischarges in compressed ambient air under the influence of static and timevarying electric fields, up to radio-frequencies. The measurements were performed for sphere to plane geometry of the electrodes separated from 5 μm to 100 μm, within the pressure range 760 Torr to 3800 Torr. For gaps of the order of a few micrometers, it is not possible to properly obtain the left-hand side of the Paschen curve; and the Townsend mechanism is no longer suitable. Deviations are also observable in the direction of lower breakdown potential that appear at the right of the minimum of the direct-current breakdown voltage curves indicating that accumulated space charge plays an important role in enhanced field emission. The experimental data agree well with the simulation results obtained by a one-dimensional particle-in-cell/Monte Carlo collision code including field emission effects. Their fit to a simple formula describing the dependence of the breakdown voltage on the product of the pressure and the gap size is suggested. Based on the measured breakdown voltage curves, the effective secondary electron emission coefficients have been determined. This work especially focuses on the effect of the electrode surface degradation on the breakdown characteristics at high pressure and high frequency. It is observed that in the case of direct-current and low frequency discharges, there is no significant influence of the electrode surface degradation on the breakdown voltage and the effective yields. However, for higher frequencies, the breakdown voltages are lower and the effective yields are much higher after degradation. The obtained results represent our attempt to derive a preliminary understanding of the governing breakdown processes in compressed air microdischarges.

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Influence of Electrode Arrangement and Gap Length on V-t Characteristics of Vacuum Gaps

2002

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Pulsed Nanosecond Breakdown of Vacuum Gaps

Cited by 3 publications

References 12 publications

Dynamics of multichannel and quasi-homogeneous sliding discharge formation in rare gases

Dynamics of multichannel and quasi-homogeneous sliding discharge formation in rare gases

The breakdown voltage characteristics of compressed ambient air microdischarges from direct current to 10.2 MHz

Influence of Electrode Arrangement and Gap Length on V-t Characteristics of Vacuum Gaps

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