Study on heat fluxes and their effect on electrode material removal on the copper electrode of a field-distortion gas spark switch

Wang, Hu; Zhang, Qiaogen; Tong, Xin; Liu, Xuandong; Qiu, Aici

doi:10.1209/0295-5075/96/45001

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…The optical emission spectrum is dominated by a large number of iron spectral lines in a range of 340∼625 nm. The iron atom may originate from the fact that the partial electrode material incurs the phase transition and is removed from the electrodes under the heat fluxes, electromagnetic force and a variety of pressures [43]. Thus, the SPJ with lots of splash iron scurfs is observed frequently during the spark discharge, especially at higher pulse energies, as shown in the upper right corner of figure 5.…”

Section: Optical Emission Spectroscopy Of Spjmentioning

confidence: 99%

Effect of pulse energy on the dynamic development of spark-plasma-jet driven by nanosecond high-voltage pulse

Tie

Zhang²,

Meng

et al. 2017

Plasma Sources Sci. Technol.

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We investigated the spatial-temporal dynamics characteristics of the spark-plasma-jet (SPJ) in the nitrogen of 0.1 MPa at different pulse energies by fast photography and optical emission spectrum. The spark plasma generated by spark discharge can be rapidly sprayed out of the micro-incentive cavity within several tens nanoseconds under the action of electric field, and the spraying delay time reduces gradually with increase of pulse energy. The outlet velocity of SPJ reaches up to 10 4 m s −1 . After that, the propulsion velocity decreases dramatically by 1 or 2 orders of magnitude at 2 μs. These two striking features were observed during the SPJ propulsion period. Firstly, there are two propulsion modes including 'plasma column' and 'plasma bullet' appearing in the development of SPJ successively. The conversion from plasma column to plasma bullet is slowed down with the increase of discharge current duration. Secondly, the inner form of SPJ exhibits the 'halo', 'corehalo' and 'tree' patterns respectively at the pulse energies of 1.6 J, 32 J and 160 J. Furthermore, the distribution morphology of SPJ obviously has flow field features. In order to accurately estimate the spatial-temporal distribution of electron parameters by optical emission spectroscopy diagnosis, the electron temperature was calculated by the Boltzmann plot method and continuum radiation, respectively, and the electron density was calculated by the Saha equation and Stark broadening respectively. The results show that the electron temperature and electron density of SPJ are 1.7 eV∼2.9 eV and 8.5×10 16 /cm 3 ∼1.0×10 18 /cm 3 respectively in different conditions. These results provide some fundamental knowledge about the dynamic development of SPJ.

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Section: Optical Emission Spectroscopy Of Spjmentioning

confidence: 99%

Effect of pulse energy on the dynamic development of spark-plasma-jet driven by nanosecond high-voltage pulse

Tie

Zhang²,

Meng

et al. 2017

Plasma Sources Sci. Technol.

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“…In wide application of pulsed power technology, under high discharge current and large electric quantity electrode erosion is common and inevitable. Switching performance parameters, including jitter, reliability, and stability, in one way or another, are related to electrode erosion, especially particulates generated from the erosion process [1][2][3][4]. When the electrode is melted by high current arc, a mass of particulates would be splashed on the surface.…”

Section: Introductionmentioning

confidence: 99%

Visualization of particulates distribution from electrode erosion

Zhong

Liu

et al. 2017

Plasma Sci. Technol.

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Particulates generated from electrode erosion in gas spark gap is inevitable and may initiate selfbreakdown behavior with high risk. Traditionally, this problem is addressed by empirical method qualitatively. To push this old problem forward, this paper conducts laser confocal microscopy measurement of eroded surface and a statistical method is introduced to obtain visualization of particulates distribution from electrode erosion after different shots. This method allows dense particulates to be classified with their heights in z direction and scattered figures of particulates within certain height range are obtained. Results indicate that the higher-than-10 μm particulates start to emerge after 200 discharge shots and particulates number has a waved radial distribution with a 0.5 mm wide deposition zone. Based on these quantitative results, the risk of reignition and field-distortion failure that are triggered by particulates can be assessed.

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“…Etch pits and burrs formed in the erosion process can result in the increase of trigger jitter and probability of prefire, reducing the lifetime of gas switch and influencing the output characteristics of the pulsed power system [5], [6]. In a gas switch with a specific working voltage, the choice of pressure and gap length greatly affects the erosion properties and the subsequent performance degradation.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Performance Due to Electrode Erosion in Field Distortion Gas Switch in Long-Term Repetitive Operation

Liu

Gou

et al. 2014

IEEE Trans. Plasma Sci.

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Field distortion gas switches are extensively used in pulsed power systems. Switch performance typically degrades because of electrode erosion, which directly influences the output parameters, stability, and reliability of pulsed power systems. With the same value of pd, different pressure and gap lengths in gas switches can affect electrode erosion property and thus, the subsequent performance degradation, but few results have been published. In this paper, repetitive discharges have been undertaken in a three-electrode field distortion gas switch with fixed pd to study the influence of pressure and gap length on electrode erosion and switch performance. The morphology of electrode surface and time histories of both trigger jitter and the probability of prefire have been investigated during the whole life cycle of the gas switch. The results show that when pd is fixed, high pressure (>0.8 MPa) and a short gap make for low trigger jitter at the start of the switch life cycle but lead to more severe electrode erosion, expediting the degradation of performance in field-distortion gas switches. Meanwhile, the probability of prefire increases rapidly with the increase of pressure.Index Terms-Electrode erosion, morphology, probability of prefire, pulsed power system, three-electrode field distortion gas switch, trigger jitter.

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Study on heat fluxes and their effect on electrode material removal on the copper electrode of a field-distortion gas spark switch

Cited by 12 publications

References 17 publications

Effect of pulse energy on the dynamic development of spark-plasma-jet driven by nanosecond high-voltage pulse

Effect of pulse energy on the dynamic development of spark-plasma-jet driven by nanosecond high-voltage pulse

Visualization of particulates distribution from electrode erosion

Degradation of Performance Due to Electrode Erosion in Field Distortion Gas Switch in Long-Term Repetitive Operation

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