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- W2032107002 abstract "A device using an RF discharge quasi-homogeneous plasma to measure antenna impedance is described. The plasma diagnosis is done by using a new probe made of a transparent resonant cavity. The electron densities ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2 times 10^{8}</tex> to <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>6 times 10^{9}</tex> particles/cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sup> ) and collision frequencies ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>6 times 10^{7}</tex> to <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1.5 times 10^{8}</tex> per second) are controlled by the discharge power. The density distribution measurements indicate a quasi-homogeneous region of 20 by 20 by 14 cm. Impedance measurement results are given for a a thick unipole between 100 and 750 MHz. The values of <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>X = (omega_{p}/omega)^{2}</tex> range from 0 to 44. They agree fairly well with Deschamps model theory applied to scaled frequency measurements as well as to a quasistatic simple analytical formula. Sheath effects enhanced by a dc bias are observed especially at low frequencies and the sheath thickness increase is calculated and found consistent with Pavkovich's parabolic potential assumption. The possibility of electronic tuning by a suitable bias is suggested." @default.
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- W2032107002 date "1971-03-01" @default.
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- W2032107002 title "Antenna impedance measurements and sheath effects in an RF generated plasma" @default.
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- W2032107002 doi "https://doi.org/10.1109/tap.1971.1139912" @default.
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