Influence of Non-Uniform Thickness of Insulating Film along the Cathode Surface on its Heating in a Glow Gas Discharge

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Дәйексөз келтіру

Толық мәтін

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Аннотация

A model of the cathode layer of a glow gas discharge is formulated in the presence of a thin insulating film on the cathode, the thickness of which varies in different areas of its surface, and on some parts of the surface, it may be absent. The model takes into account ion-induced electron emission from the cathode surface, thermal-field electron emission from the cathode substrate into the film, and thermal electron emission from areas of the cathode surface without a film. It is shown that when the cathode is heated, the effective electron emission coefficient of the cathode and the discharge current density decrease, since this reduces the electric field strength in the film, which provides the current density of thermal field electron emission from the cathode substrate into the film necessary to maintain the discharge. As a result, the film emission efficiency, the cathode effective ion-electron emission coefficient and the discharge current density are decreased. Therefore, when the insulating film is on the entire cathode surface, the glow discharge does not transform into an arc discharge for a long time. If there is no insulating film on some part of it, then after cathode heating to a sufficiently high temperature, thermal emission of electrons starts from it. The electrons leave the cathode surface, increase its effective coefficient of electron emission, and discharge current density. This causes more intensive cathode heating and accelerates transition from glow discharge to an arc discharge.

Авторлар туралы

G. Bondarenko

HSE University

Хат алмасуға жауапты Автор.
Email: gbondarenko@hse.ru
Ресей, Moscow, 101000

M. Fisher

Bauman Moscow State Technical University

Email: fishermr@bmstu.ru
Ресей, Moscow, 105005

V. Kristya

Bauman Moscow State Technical University

Email: kristya@bmstu.ru
Ресей, Moscow, 105005

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