Selection of dust particles in radio frequency inductive discharge

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Abstract

Selection of dust particles in three-dimensional plasma–dust trap in the electrodeless radio frequency inductive discharge in neon was studied for the first time. The discharge conditions and the discharge chamber design were chosen so that the dust structures of polydisperse quartz particles are created in the resulting dust trap. The structure lengths were of up to 1.5 cm and the number of particles in them was of up to 4000. Statistical analysis of the sizes of trapped particles has shown that under the conditions chosen the average particle size is close to 4 μm, and in a wide range from 0.25 to 1.0 Torr, it weakly depends on neon pressure. It was found that in the three-dimensional dust structure formed, the longitudinal interparticle distance changes in anomalously wide range, as compared to the dust structures formed in plasma of glow discharge. The characteristic size of the trapped particles was estimated based on the vertical balance of forces acting on dust particle. It was shown that, in terms of a number of parameters, the method of particle selection in radio frequency inductive discharge is preferable, as compared to similar method used in glow discharges in strata, and the dust trap applied can be used for studying three-dimensional dusty plasmas in the magnetic field.

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L. А. Novikov

St. Petersburg State University

Author for correspondence.
Email: l.novikov@spbu.ru
Russian Federation, St. Petersburg

М. A. Gasilov

St. Petersburg State University

Email: l.novikov@spbu.ru
Russian Federation, St. Petersburg

M. S. Golubev

St. Petersburg State University

Email: l.novikov@spbu.ru
Russian Federation, St. Petersburg

M. V. Morozova

St. Petersburg State University

Email: l.novikov@spbu.ru
Russian Federation, St. Petersburg

E. S. Dzlieva

St. Petersburg State University

Email: l.novikov@spbu.ru
Russian Federation, St. Petersburg

S. I. Pavlov

St. Petersburg State University

Email: l.novikov@spbu.ru
Russian Federation, St. Petersburg

V. Yu. Karasev

St. Petersburg State University

Email: plasmadust@ya.ru
Russian Federation, St. Petersburg

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Supplementary files

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2. Fig. 1. a) Schematic diagram of the experimental setup. Designations: 1 – inductor; 2 – dust structure; 3 – container for injecting dust particles into the discharge; 4 – illumination system; 5 – carriage with a microscope slide lying on it for collecting particles; 6 – vacuum valve for removing the carriage; 7 – magnet for moving the carriage inside the tube. b) Histogram of the distribution of the sizes of the bulk powder. c) Photograph of the setup.

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3. Fig. 2. The structure in the dust trap in the RFI discharge, created from polydisperse quartz particles. Conditions: neon gas, pressure – 0.4 Torr, voltage – 180 V, RF generation frequency – 40 MHz, tube diameter – 1.9 c m. a) Photo of the horizontal section of the dust structure. Image height – 4.7 mm. b) Photo of the vertical diametrical section of the dust structure. Image height – 18 mm.

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4. Fig. 3. a) Photo of dust particles deposited from the RFI discharge. Particle size is about 4 µm. Image width is 200 µm. b) histogram of dust particle distribution by characteristic size. Conditions: neon gas, pressure – 0.5 Torr, voltage – 100 V, RF generation frequency – 40 MHz.

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5. Fig. 4. Dependence of the average size of dust particles on neon pressure. Conditions: voltage – 100 V, RF generation frequency – 40 MHz.

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6. Fig. 5. Longitudinal interparticle distance. Conditions: neon gas, pressure – 0.6 Torr, polydisperse quartz. The coordinate is measured from the lower turn of the inductor.

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