Spectroscopic measurements of radial distribution of electron density and temperature in a plasma

Placentino, Leonardo; Colombo, E.; Emolumento, E; Paganini, E.; Piemontese, V; Tondello, G.

doi:10.1088/0963-9659/5/4/011

Cited by 1 publication

(1 citation statement)

References 20 publications

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“…One type of the images showed that the electron densities in the cathode tip vicinity (CTV) were locally reduced below our sensors sensitivity of 10 21 m −3 and the electron density distributions in the axial direction y were seen to be spatially discontinuous, as shown in figure 11(a). The electron densities in −0.9 y 1.5 mm were 10 22−23 m −3 , which agreed well with the electron densities at the current-zero point for a puffer-type SF 6 gas circuit breaker observed by using Stark broadening [39]. Figure 11(b) shows that the simultaneously recorded voltage and current waveforms had damping rates of dv/dt = 0.42 kV μs −1 and di/dt = 0.27 A μs −1 around the current-zero point, respectively.…”

Section: Sf 6 Gas-blastsupporting

confidence: 82%

Two-dimensional electron density characterisation of arc interruption phenomenon in current-zero phase

Inada¹,

Kamiya²,

Matsuoka³

et al. 2017

J. Phys. D: Appl. Phys.

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Two-dimensional electron density imaging over free burning arcs and gas-blast arcs was conducted at current zero using highly sensitive Shack–Hartmann type laser wavefront sensors in order to experimentally characterise electron density distributions for the success and failure of arc interruption in the thermal reignition phase. The experimental results under an interruption probability of 50% showed that free burning arcs with axially asymmetric electron density profiles were interrupted with a success rate of 88%. On the other hand, the current interruption of gas-blast arcs was reproducibly achieved under locally reduced electron densities and the interruption success rate was 100%.

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Section: Sf 6 Gas-blastsupporting

confidence: 82%