A study of discharge fluctuations in magnetically-supported dc discharge in cylindrical and inverted cylindrical configuration

Bilyk, O.; Kudrna, P.; Holík, Miroslav; Marek, A.; Tichý, M.; Behnke, J. F.

doi:10.1007/bf03166479

Cited by 1 publication

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“…This is due to the instabilities that develop in the dc discharge and the amplitude of which at higher magnetic fields rises. Preliminary studies of the power spectra of these fluctuations [11], [12] have shown that they can be possibly characterized as the non-linear ionization-drift turbulence of similar kind as described by Lin and Wu in [21].…”

Section: Resultsmentioning

confidence: 98%

Modeling and Diagnostic of the Plasma of Magnetic Field Supported Discharges

Porokhova

Holík

Bilyk

et al. 2005

Contrib. Plasma Phys.

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In this paper we present an experimental study of the variations of plasma parameters in both the axial as well as in radial directions in a 30 cm long cylindrical magnetron with outer cylindrically-shaped anode (diameter 58 mm) and coaxially placed cathode with a diameter of 1.8 cm. The measurements were made using three radially movable cylindrical Langmuir probes placed at three different axial positions between the magnetic coils. From the measurements there were evaluated electron density, electron mean energy, plasma potential and floating potential in dependence of the magnetic field (10 -40 mT) and the argon pressure (2 -7 Pa). In order to measure the axial variations of the discharge current, one half of the cathode length is segmented into 14 isolated segments with length of about 10 mm.The physical processes occurring in electrode regions and the positive column of a cylindrical magnetron discharge in crossed electric and magnetic fields are investigated basing on the solution of the Boltzmann kinetic equation by a multiterm decomposition of the electron phase space distribution function in terms of the spherical tensors. The influence of the distribution function anisotropy on the absolute values and radial profiles of the electron density and rates of various transport and collision processes is analyzed. The spiral lines for the directed particle and energy transport are obtained to illustrate the anisotropy effects in dependence on magnetic field. The electron equipressure surfaces are constructed in the form of ellipsoids of pressure and their transformation in the cathode and anode regions is studied. A strong anisotropy of the energy flux tensor in contrast to a weak anisotropy of the momentum flux density tensor is found. Particular results are obtained for the cylindrical magnetron discharge in argon at pressure 3 Pa, current 200 mA and magnetic fields ranging within 10 − 40 mT.

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Section: Resultsmentioning

confidence: 98%