Subnanosecond X-ray apparatus with flexible cable radiator probe based on small-size explosive emission vacuum diode

Ivanov, S. N.; Mesyats, G.; Shpak, V. G.

doi:10.1088/1748-0221/6/05/p05008

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…An important factor is that the electrical strength of almost any medium increases with a decreasing in a pulse duration [20]. As a result, it is possible to create small-sized pulsed x-ray devices and subminiature x-ray tubes, which have prospects for use for intracavitary diagnostics [21]. Therefore, increasing the speed of the gas spark gaps is a very urgent practical task.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the switching characteristics of high-pressure subnanosecond gas dischargers with the purpose of a sharp increasing of the breakdown voltages and the switching speed

Ivanov¹

2022

Plasma Sources Sci. Technol.

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The paper analyzes the data obtained in the subnanosecond time range on the times (t br) and speeds (V br) of switching of hydrogen diode dischargers. These data were obtained in a wide range of hydrogen pressures (p) and the degree of the discharge gap overvoltage (the length of the cathode-anode gap d) in a uniform electric field. It is shown that the reduced strength of the average electric field E br/p in the discharge gap at the moment of the beginning of the breakdown significantly decreases when the gas pressure increases from 5 atm to 50 atm. An increase in pressure from 50 atm to 60 atm leads to a sharp (by 40–135%, depending on the d) increase in the pulse breakdown voltage (U br) and an increase in E br/p. In proportion to the growth of E br/p the switching speed V br of the discharge gas gap increases. The observed effect is explained by the change in the discharge initiation mechanisms. The limitation of U br and V br in the hydrogen pressure range from 5 atm to 50 atm occurs as a result of gas ionization by runaway electrons and the subsequent development of a multi-avalanche discharge in the volume of the discharge gap. With a further increase in pressure, the discharge develops according to the streamer type. To design ultrafast gas dischargers of the subnanosecond range intended for switching high voltages, it is necessary to select an appropriate range of working gas pressures in order to ensure the development of a streamer-type discharge.

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Section: Introductionmentioning

confidence: 99%

Investigation of the switching characteristics of high-pressure subnanosecond gas dischargers with the purpose of a sharp increasing of the breakdown voltages and the switching speed

Ivanov¹

2022

Plasma Sources Sci. Technol.

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The Riemann–Volterra time-domain technique for waveguides: A case study for elliptic geometry

Utkin

2012

Wave Motion

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Investigation of the possibility of generation of runaway electrons in subnanosecond gas discharges of high and ultrahigh pressure in the vicinity of microprotrusions on the cathode surface

Ivanov,

Lisenkov

2024

Physics of Plasmas

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In the pressure range of 1–40 atm, experimental and theoretical studies of the processes of initiation and development dynamics of the initial stage of the self-sustained subnanosecond discharge in nitrogen, developing in a uniform electric field with the participation of runaway electrons, were carried out. Data on the maximum achievable values of the electric field strength in the discharge gap at the pre-breakdown stage of the discharge development and photographs of the microrelief of the surface of a stainless steel cathode formed during its training by subnanosecond high-voltage pulses were obtained. These data served as the basis for numerical 3D modeling of the development of an electron avalanche initiated by a field emission electron in a small region of enhanced electric field near a microinhomogeneity on the cathode. The possibility of transition of electrons in these avalanches to the runaway regime was studied. Cone-shaped microprotrusions, metal drops, and boundaries between pores and microcraters were considered as microinhomogeneities. It has been shown that the initial energy obtained by an electron near the microinhomogeneity can significantly facilitate its transfer into the runaway regime. This effect is especially noticeable at gas pressures higher 10 atm. As a result, at the stage of a self-sustained subnanosecond discharge formation, the runaway mode of an electron can be realized at the average reduced electric field strengths in the discharge gap, which are significantly lower than required by the runaway criterion.

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Subnanosecond X-ray apparatus with flexible cable radiator probe based on small-size explosive emission vacuum diode

Cited by 5 publications

References 7 publications

Investigation of the switching characteristics of high-pressure subnanosecond gas dischargers with the purpose of a sharp increasing of the breakdown voltages and the switching speed

Investigation of the switching characteristics of high-pressure subnanosecond gas dischargers with the purpose of a sharp increasing of the breakdown voltages and the switching speed

The Riemann–Volterra time-domain technique for waveguides: A case study for elliptic geometry

Investigation of the possibility of generation of runaway electrons in subnanosecond gas discharges of high and ultrahigh pressure in the vicinity of microprotrusions on the cathode surface

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