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- W2019791803 abstract "Neutral depletion effects are observed in a steady-state flowing argon helicon plasma with a magnetic nozzle for high rf input powers (up to 3kW). Noninvasive diagnostics including 105GHz microwave interferometry and optical spectroscopy with collisional-radiative modeling are used to measure the electron density (ne), electron temperature (Te), and neutral density (nn). A region of weak neutral depletion is observed upstream of the antenna where increasing rf power leads to increased electron density (up to ne=1.6×1013cm−3) while Te remains essentially constant and low (1.7–2.0eV). The downstream region exhibits profound neutral depletion (maximum 92% line-averaged ionization), where Te rises linearly with increasing rf power (up to 4.9eV) and ne remains constrained (below 6.5×1012cm−3). Flux considerations indicate accelerated plasma flow (Mach 0.24) through the antenna region due to an axial pressure gradient with reduced collisional drag from neutral depletion." @default.
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- W2019791803 date "2008-07-01" @default.
- W2019791803 modified "2023-10-18" @default.
- W2019791803 title "Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma" @default.
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- W2019791803 doi "https://doi.org/10.1063/1.2950301" @default.
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