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• W4323644410 abstract "A detailed characterization of RF–plasma discharge in the multi-cusp plasma device (MPD) having a multi-dipole line cusp magnetic field (MMF: <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$B_{0}$ </tex-math></inline-formula> ) has been experimentally demonstrated using the externally employed four turns high power spiral antenna. The experimentally measured input impedance ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim $ </tex-math></inline-formula> 0.37 + <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{j}80,Omega$ </tex-math></inline-formula> ) of the complete antenna system along with the MPD is found to be in good validation with the CST–MWS simulated result ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim $ </tex-math></inline-formula> 0.3 + <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{j}88,Omega$ </tex-math></inline-formula> ). The cusp magnetic field ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$B_{0}$ </tex-math></inline-formula> ) along the MPD chamber is also validated and has a good agreement with the simulated results for the magnet current of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim $ </tex-math></inline-formula> 150 A. The antenna is then made to resonate at 13.56 MHz using an external L-type matching network (MN) along with an RF source. It is found that the plasma density shifts to a maximum ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$n_{e} sim 3.2 times 10^{17}/text{m}^{3})$ </tex-math></inline-formula> value at the argon-filled pressure of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$2times 10^{-3}$ </tex-math></inline-formula> mbar for large <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$B_{0}$ </tex-math></inline-formula> and RF power of 1 kW. Further, the input resistances of the antenna with a vacuum ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$R_{v} sim 0.27,Omega$ </tex-math></inline-formula> ) and plasma ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$R_{p} sim 0.55,Omega$ </tex-math></inline-formula> ) inside the MPD under the matched condition are also measured experimentally using the Rogowski coil. This concluded that the RF power coupling efficiency ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$eta$ </tex-math></inline-formula> ) with the Argon plasma is <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim $ </tex-math></inline-formula> 68%. A plasma with nearly a uniform density of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim 2.7,times , 10 ^{17}/text{m}^{3}$ </tex-math></inline-formula> is obtained up to a radial distance of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim $ </tex-math></inline-formula> 5 cm from the MPD center at the constant RF power of 800 W for the Argon-filled pressure and magnet current of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$4times 10^{-3}$ </tex-math></inline-formula> mbar and 100 A respectively." @default.
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• W4323644410 date "2023-03-01" @default.
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• W4323644410 title "Characterization of Plasma Discharge in a Multi Dipole Line Cusp Magnetic Field Created by an RF Source Coupled by a Spiral Antenna" @default.
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