Influence of the longitudinal magnetic field on the length of the Faraday dark space region
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Magnetized plasma is used in many technological applications. Investigation of the magnetic field influence is therefore of great interest. In present paper a low pressure gas discharge in neon in presence of the longitudinal magnetic field is investigated. Experiments were performed on the cylindrical discharges with three different value of tube radius. The length of the faraday dark space region was recorded as a function of magnetic field value and the discharge current. The length has shown a steep increase with the magnetic field. Under some conditions almost whole interval between the electrodes was dark. A simple hydrodynamic model of the faraday dark space is considered in order to explain observed phenomena. Intensive diffusion processes lead to the field reversal in this region. With increasing magnetic field the effective losses of the charged particle to the wall become smaller. This serves as a reason for the extension of the dark space. The applied description yields good qualitative agreement with experiment. The discrepancies in quantitative values are discussed.