Low-pressure gas breakdown in uniform dc electric field

Lisovskiy, Valeriy; Yakovin, S.; Yegorenkov, Vladimir

doi:10.1088/0022-3727/33/21/310

Cited by 146 publications

(134 citation statements)

References 45 publications

(116 reference statements)

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“…propagation time) of the ionization wave by three orders of magnitude. In this situation it can be considered that the primary electrons feeding the ionization wave appear instantaneously [13], meaning that the source of primary electrons is not radioactivity and fast particles from the cosmic shower. This source has to be controlled by the ionization wave itself and there are four possible electron emission mechanisms that could be involved in this process:…”

Section: Overview Of Phenomenamentioning

confidence: 99%

“…This leads to a radial electron flux Γ el which is not collected at the end of the wave front region, and which therefore does not contribute to the avalanche process (figure 36). We integrate the expression of the loss rate of electrons to the wall by following the approach of Lisovskiy et al [13]. In the wave front region we consider that the field E F is homogeneous and not affected by the charging wall.…”

Section: Modelling Of the Pre-breakdown Wavementioning

confidence: 99%

See 1 more Smart Citation

Optical and electrostatic potential investigations of electrical breakdown phenomena in a low-pressure gas discharge lamp

Gendre¹,

Haverlag²,

Kroesen³

2010

J. Phys. D: Appl. Phys.

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The ignition phase is a critical stage in the operation of gas discharge lamps where the neutral gas enclosed between the electrodes undergoes a transformation from the dielectric state to a conducting phase, eventually enabling the production of light. The phenomena occurring during this phase transition are not fully understood and the related experimental studies are often limited to local optical measurements in environments prone to influencing these transient phenomena. In this work unipolar ignition phenomena at sub-kilovolt levels are investigated in a 3 Torr argon discharge tube. The lamp is placed in a highly controlled environment so as to prevent any bias on the measurements. A fast intensified CCD camera and a specially-designed novel electrostatic probe are used simultaneously so as to provide with a broad array of measured and computed parameters which are displayed in space-time diagrams for cross comparisons. Experiments show that three distinct phases exist during successful ignitions: Upon the application of voltage a first ionization wave starts from the active electrode and propagates in the neutral gas toward the opposite electrode. A local front of high axial E field strength is associated with this process and causes a local ionisation to occur, leading to the electrostatic charging of the lamp. Next, a second wave propagates from the ground electrode back toward the active electrode with a higher velocity, and in this process leads to a partial discharging of the lamp. This return stroke draws a homogeneous plasma column which eventually bridges both electrodes at the end of the wave propagation. At this point both electrode sheaths are formed and the common features of a glow discharge are observed. The third phase is an increase of the light intensity of the plasma column until the lamp reaches a steady state operation. Failed ignitions present only the first phase where the first wave starts its propagation but extinguishes in the lamp, leading to a charge memory effect. It is found that the full propagation of this first wave is a requirement for a successful lamp ignition. Differences in the properties of the waves were observed depending on the voltage polarity, and it was estimated that a photoelectric effect at the wall is the most likely source of electron for the ionisation wave of positive polarity. Finally a simple model of the first ionization wave is developed and used to analyse the fundamental differences between processes occurring at negative and at positive polarity. From this study three conditions are developed for the successful unipolar ignition of lamps and the relations between them are derived.

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Section: Overview Of Phenomenamentioning

confidence: 99%

Section: Modelling Of the Pre-breakdown Wavementioning

confidence: 99%

Optical and electrostatic potential investigations of electrical breakdown phenomena in a low-pressure gas discharge lamp

Gendre¹,

Haverlag²,

Kroesen³

2010

J. Phys. D: Appl. Phys.

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“…For a dc gas breakdown (in a constant electric field) the similarity law has the form U dc = ψ(pL)a n d it is called the Paschen law [20,21]. However, as was shown in paper [22], the Paschen law is valid only for narrow gaps when the inter-electrode distance is small compared with the discharge tube radius, L ≪ R,a sw e l l as for geometrically similar tubes. For cylindrical discharge tubes with arbitrary L and R values the similarity law for dc gas breakdown should be written in the form [22] …”

Section: -P2mentioning

confidence: 99%

Similarity law for rf breakdown

Lisovskiy¹,

Booth

Landry³

et al. 2008

Europhys. Lett.

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This paper demonstrates that the similarity law for the rf gas breakdown has the form U rf = ψ(p • L, L/R, f • L)(where U rf is the rf breakdown voltage, p is the gas pressure, L and R are the length and diameter of the discharge tube, respectively, f is the frequency of the rf electric field). It means that two rf breakdown curves registered for narrow inter-electrode gaps or in geometrically similar tubes and depicted in the U rf (p • L) graph will coincide only when the condition f • L = const is met. This similarity law follows from the rf gas breakdown equation and it is well supported by the results of measurements.

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“…Reduction of plasma volume leads to constrict the current path and decrease the discharge diameter. Furthermore, it is known that the discharge voltage in N 2 gas is higher than that in Ar gas at the same conditions [16,17]. Then, in this work, we examined whether N 2 gas shows the plasma constriction and higher discharge voltage.…”

Section: Influence Of Shielding Gas On DC Dischargementioning

confidence: 95%

Development of controlled micro-discharge at the atmospheric pressure

2013

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The generation method of sub-millimeter sized plasma was developed through controlling the electrical discharge in the range from glow to arc discharge with use of the experimental torch device and the newly designed high-voltage power source. The electrical discharge was established between a cathode of the electrolytic polished tungsten electrode and an anode of stainless steel sheet. Features of the thermal materials processing by micro-discharge were experimentally investigated. It is shown that the power density of micro-discharge reaches higher than 10 9 W/m 2 and sub-millimeter sized melt spot can be obtained at the surface of anode metal.

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Low-pressure gas breakdown in uniform dc electric field

Cited by 146 publications

References 45 publications

Optical and electrostatic potential investigations of electrical breakdown phenomena in a low-pressure gas discharge lamp

Optical and electrostatic potential investigations of electrical breakdown phenomena in a low-pressure gas discharge lamp

Similarity law for rf breakdown

Development of controlled micro-discharge at the atmospheric pressure

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