COMBINED PROBE AND OPTICAL LOCAL MEASUREMENTS IN A HOLLOW CATHODE DISCHARGE

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Using a moving Langmuir probe assembly and a fiber-optic sensor, simultaneous measurements of the electron energy distribution function EEDF f(u), their concentration Ne, and the emission spectra I(λ) of plasma with spatial resolution were performed in a discharge in inert gases at low pressure supported by a hollow cathode. The dynamic range of f(u) measurements is 5 orders of magnitude, while the observed ranges of Ne and I(λ) variations in space are up to 3 orders of magnitude. It was found that even small additions of Xe to He lead to significant changes in the EEDF shape, including in space. Within the framework of the coronal model (CM), the spatial profiles I(λ) of a number of lines of the Xe atom in a discharge in a He:Xe (99:1) mixture were calculated from the measured f(u) and Ne. Even in the approximation of this simple model, the results of the intensity calculations, on the whole, agree satisfactorily with the measured ones. A common method for measuring electron temperatures from the relative intensities of spectral lines of atomic transitions is discussed.

作者简介

A. Bernatskiy

Р.N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: bernatskiyav@lebedev.ru
Moscow, Russia

I. Draganov

Р.N. Lebedev Physical Institute of the Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: draganov.i@lebedev.ru
Moscow, Russia; Dolgoprudny, Russia

I. Kochetov

Р.N. Lebedev Physical Institute of the Russian Academy of Sciences; Troitsk Institute for Innovation and Fusion Research

Email: kochet@triniti.ru
Moscow, Russia; Moscow, Russia

V. Ochkin

Р.N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: ochkinvn@lebedev.ru
Moscow, Russia

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