Details

Autor(en) / Beteiligte

• Grigorian, G. M.
• Demyanov, A. V.
• Dyatko, N. A.
• Kochetov, I. V.

Titel

Study of the Characteristics of the Positive Column of a Direct Current Glow Discharge in Xenon

Ist Teil von

• Plasma physics reports, 2021-06, Vol.47 (6), p.588-597

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2021

Quelle

springer (창간호~2014)

Beschreibungen/Notizen

• Experimental and theoretical studies of plasma parameters of the positive column of a direct current glow discharge in xenon were carried out. In the experiments, a discharge tube with a radius of 2 cm and a distance between the electrodes of 56 cm was used. The experiments were carried out for the gas pressure of 0.1 and 1 Torr, and the discharge current was varied in the range of 10–50 mA. The electric field strength in the positive column of the discharge and the population of the lower metastable 1 s 5 state of the xenon atom (the population is measured only for the pressure of 0.1 Torr) on the axis of the discharge tube are measured. A self-consistent 0-dimensional kinetic model of the discharge in xenon was developed and verified by comparing the calculation results with the data published in literature. Calculations performed for the above experimental conditions showed that the theoretical values of electric field strength differ markedly from the measured ones. Possible reasons for this difference are discussed. It is shown, in particular, that at the reduced electric field, which is implemented in the discharge plasma at a pressure of 1 Torr, the electron–electron collisions significantly affect the shape of the electron energy distribution function and, accordingly, the rate of the processes of production and loss of electrons. Concerning the population of the lower metastable level of the Xe atom, the calculated values agree well with the results of measurements. Within the developed discharge model, the emission spectrum of the discharge plasma in the range of 119–3400 nm is also calculated. It is shown that most of the energy is emitted in the UV region at a wavelength of 147 nm.