Luminescence of short-lived color centers induced in LiF crystals by a pulsed microwave discharge

Batanov, G. M.; Ivanov, V. A.; Konyzhev, M. E.; Летунов, А. А.

doi:10.1134/1.567497

Cited by 17 publications

(2 citation statements)

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“…The multipactor glow is caused by the bombardment of the dielectric surface by electrons produced due to SEE avalanche in the microwave field [13]. In crystal dielectrics, this is luminescence of color centers (defects of the crystal lattice) generated in a thin surface layer under the action of incident electrons [14]. The multipactor stage is of crucial importance for the subsequent breakdown at the Oscilloscope trace of the reflected microwave power P ref .…”

Section: Methodsmentioning

confidence: 99%

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Strong Local Interaction of Microwave Discharges With Solid Dielectrics in Vacuum

Ivanov

Sakharov

Konyzhev

2015

IEEE Trans. Plasma Sci.

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Excitation of microwave discharges by pulsed microwave radiation (≤2 MW, 1.95 GHz, 1-10 µs) on dielectric surfaces in vacuum (10 −6 torr) was studied experimentally. Different stages of a surface microwave discharge were observed: secondary-electron-emission microwave discharge (multipactor), surface microwave breakdown (filamentary microwave discharge), and plasma-flare microwave discharge. It is found that, in the stage of microwave breakdown (which lasts for ∼0.1 µs), ≥70% of the incident microwave power is absorbed by a dense plasma filament with a diameter of ∼100 µm, an electron density of up to 2 × 10 18 cm −3 , and an electron temperature of about 2 eV. Strong interaction of the dense plasma of the filamentary microwave discharge with the dielectric leads to local destruction of the dielectric surface in the form of a long thin erosion track (l ≈ 6 cm, d ∼ 100 µm). The coefficient of microwave power absorption by a plasma filament in a rectangular waveguide is calculated using an electrodynamic model that does not involve expansion in the waveguide modes and takes into account reflections of the scattered wave from the waveguide walls by introducing an array of filament mirror images. It is shown that the coefficient of microwave power absorption by the filamentary discharge plasma can reach 70% and more, which agrees well with the experimental data.

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Section: Methodsmentioning

confidence: 99%

“…Therefore, from (10), we obtain (14) where R rad ≡ πk 0 /c = Z vac k 0 /4, with Z vac = 4π/c being the impedance of free space (Z vac ≈ 377 in SI units). The proportionality coefficient R rad can be called the radiative resistance per unit length.…”

Section: A Plasma Filament In Free Spacementioning

confidence: 99%