Field electron emission from cathode as a possible factor in the transition from a streamer to spark discharge channel

In this article we report on work where the formation of a spark in nanosecond high-voltage discharges was studied in nitrogen, nitrogen-methane mixtures, and air at increased pressures under the conditions of runaway electron generation. Voltage pulses of amplitude ∼90 and ∼250 kV were applied to a point-to-plane gap with a planar anode and a cathode of small curvature radius. Cathode spots appeared early in the discharge, within ∼200 ps of a corona discharge at high rate of rise of the voltage (∼5 × 1014 V/s) across centimeter point-to-plane gap spacing. The spark leader that bridged the point-to-plane gap propagated from the planar anode with cathode spots and a voltage pulse rise time of less than 1 ns. The discharge from diffuse clouds took the form of diffuse jets with increasing pulse repetition rate, thus achieving the accumulation effect in a repetitively pulsed discharge. Characteristic emission spectra are presented for spark diffuse and corona discharges.

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Spark discharge formation in an inhomogeneous electric field under conditions of runaway electron generation

Тарасенко

Ломаев

Сорокин

et al. 2012

Journal of Applied Physics

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Device for wideband ratio pyrometry

Kneschaurek

Павлов

Rjabow

et al. 2019

J. Phys.: Conf. Ser.

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In this article we present procedures of creation, verification, and application of a device for contactless measurement of object’s temperature in vacuum. In contrast to conventional dual-wavelength pyrometers, it does not rely on spectral filtering and makes use of the intrinsic bandwidth parameters of photodetectors. In theory the device is capable of measuring values of temperature ranging from room temperature to several thousands kelvins. The verification was performed using a reference thermometer. Also, in-field measurements of the sample’s temperature in vacuum were conducted, which show efficiency of the proposed system.

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Numerical simulation of low pressure gas metal arc plasma

Карпов

Ушаков

Лепешев

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Field electron emission from cathode as a possible factor in the transition from a streamer to spark discharge channel

Cited by 6 publications

References 10 publications

Spark discharge formation in an inhomogeneous electric field under conditions of runaway electron generation

Spark discharge formation in an inhomogeneous electric field under conditions of runaway electron generation

Device for wideband ratio pyrometry

Numerical simulation of low pressure gas metal arc plasma

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