Characteristics of interelectrode flashover in air with the existence of a weakly ionized plasma channel induced by a KrF laser (248 nm)

Sasaki, Jun; Kubodera, Shoichi; Ozaki, Ryoichi; Uchiyama, Taro

doi:10.1063/1.337554

Cited by 20 publications

(11 citation statements)

References 5 publications

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“…Thus, we consider that the electrons do not play an important role. Sasaki et al 10 have already reported the similar results and pointed out the importance of the negative ions. Since time to flashover and guide length of the laser-guided positive discharge do not change drastically from the delay time of Ϫ1 s to that of 10 s, we considered that the mechanisms of the triggering and guiding ability at the negative delay times are fundamentally similar to those at the positive delay times.…”

Section: B Positive Polaritysupporting

confidence: 54%

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Guiding of electrical discharges under atmospheric air by ultraviolet laser-produced plasma channel

Miki

Wada

1996

Journal of Applied Physics

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Guiding and triggering of electrical discharges in 0.34 m air gaps by an ultraviolet laser-produced plasma have been demonstrated. An ultraviolet laser pulse ͑KrF laser, wavelengthϭ248 nm, energyϭ750 mJ͒ produced the plasma channel by a focusing lens with a focal length of 1 m. This plasma channel forms a straight discharge channel along the laser beam ͑guiding ability͒ and reduces the flashover voltage ͑triggering ability͒. We measured the guiding and triggering ability of the laser-produced plasma channel and estimated the state of the plasma channel by calculating the rate equations. From these experiments and simulations, we found that the guiding ability of the ion plasma is mainly due to the formation of the leader from the plasma channel by enhancement of the local fields. The guiding ability of the electron-ion plasma is different from that of the ion plasma.

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Section: B Positive Polaritysupporting

confidence: 54%

“…There have been several experiments on laser-guided discharges using ultraviolet lasers. 10 But most were conducted under low pressure. 11,12 We attempted to guide the discharge in atmospheric air using a KrF laser ͑248 nm͒ with a pulse energy of 750 mJ.…”

Section: Introductionmentioning

confidence: 99%

Guiding of electrical discharges under atmospheric air by ultraviolet laser-produced plasma channel

Miki

Wada

1996

Journal of Applied Physics

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“…However, in these researches, the laser intensity is very high. For example, the laser intensity should be higher than 10 11 W/cm 2 when infrared (1.06 μm) is used in laser-triggered lightning discharge [52], and should be higher than 10 8 W/ cm 2 for UV laser (248 nm) [53]. As mentioned earlier, at such a strong beam intensity, MPI and inverse Bremsstrahlung will occur.…”

Section: Discussion and Analysismentioning

confidence: 97%

Study on the effect of artificial radiation simulating terrestrial solar ultraviolet radiation on negative DC discharge performance of air gap

Shu

Yang

Jiang

et al. 2014

IET Generation, Transmission & Distribution

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It is important to reveal the effect of terrestrial solar ultraviolet radiation (TSUVR) on discharge performance of external insulation for the design and operation of a power system in regions with strong TSUVR, especially in Tibet. However, no research was carried out in this field until now. In this study, an artificial UV lamp was used to imitate TSUVR in the relevant experiments to research on the effect of negative DC discharge. It was found that artificial radiation simulating terrestrial solar UV radiation (STSUVR) does not affect appreciably the negative DC corona characteristics and breakdown voltage of short rod-plane air gaps of several electrode materials. That is because the wavelength of the STSUVR is in the range of 290-400 nm, and its intensity is less than 200 W/m 2 . Thus, air, Cu and Fe cannot be photoionised by STSUVR. There is also no effect of the STSUVR on arc propagation because of energy. Although a part of the photons in the TSUVR has higher energy than the work function of Al, it is very easy for the Al to be oxidised, and the oxide film (Al 2 O 3 ) can prevent Al from being ionised by TSUVR. Therefore the TSUVR does not have an obvious effect on negative DC discharge performance of air gap.

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“…Generally, it is difficult to measure plasma and the electrons in the plasma simultaneously. Therefore, we attempted to perform an electrical investigation of the behavior of electrons that are synchronized with PLPP using a symmetric double probe (SDP) [5]. The conventional double-probe method such as the one that is reported in floating-probe experiments [17] is not suitable for after-glow plasmas because, in our experiment, PLPP localizes in the SDP gap without coming in contact with the electrode surfaces.…”

Section: Introductionmentioning

confidence: 98%

Detection of Long-Lived Electrons Around $ \hbox{CO}_{2}$-Laser-Produced Plasma in Atmospheric Gases Using Symmetric Double-Probe System

Okano

2007

IEEE Trans. Plasma Sci.

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We have studied the behavior of charged particles around a CO 2 -laser-produced plasma in atmospheric air using a symmetric double-probe system. It is important and useful to verify the existence of long-lived electrons in applications such as laser-induced electrical discharge, laser-triggered gap switching, and laser ablation. Experimental results showed that 1) electrons and plasma can be discriminated based on their time of arrival by applying intermittent pulses with biases less than the electron affinities of negative ions (O − or O − 2 ); 2) the electron signal responded for more than 100 µs, even though the electrons were influenced by a strong attachment effect that is induced by oxygen and water molecules that are present in room air at 1 atm; and 3) the total density of free and detached electrons around the laser-produced plasma was estimated to be 10 16 m −3 based on the pulse signal response that is detected by double-probe electrodes.

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Characteristics of interelectrode flashover in air with the existence of a weakly ionized plasma channel induced by a KrF laser (248 nm)

Cited by 20 publications

References 5 publications

Guiding of electrical discharges under atmospheric air by ultraviolet laser-produced plasma channel

Guiding of electrical discharges under atmospheric air by ultraviolet laser-produced plasma channel

Study on the effect of artificial radiation simulating terrestrial solar ultraviolet radiation on negative DC discharge performance of air gap

Detection of Long-Lived Electrons Around $ \hbox{CO}_{2}$-Laser-Produced Plasma in Atmospheric Gases Using Symmetric Double-Probe System

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