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NON-MONOTONIC DISTRIBUTIONS OF EXCITED ATOMS IN POSITIVE COLUMN OF He DISCHARGES: DYNAMIC PLASMA

DOE Plasma Science Center Control of Plasma Kinetics. NON-MONOTONIC DISTRIBUTIONS OF EXCITED ATOMS IN POSITIVE COLUMN OF He DISCHARGES: DYNAMIC PLASMA. Simulation: Different Stages of Positive Column in Pulsed Current Regimes.

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NON-MONOTONIC DISTRIBUTIONS OF EXCITED ATOMS IN POSITIVE COLUMN OF He DISCHARGES: DYNAMIC PLASMA

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  1. DOE Plasma Science Center Control of Plasma Kinetics NON-MONOTONIC DISTRIBUTIONS OF EXCITED ATOMS IN POSITIVE COLUMN OF He DISCHARGES: DYNAMIC PLASMA Simulation: Different Stages of Positive Column in Pulsed Current Regimes • Nonmonotonic radial distributions of excited helium have been experimentally observed in a pulsed positive column using laser induced fluorescence. Simulations indicate a “dynamic discharge” regime with peculiar properties. Radial distribution of excited atoms for different pressure and time during the current pulse. HIGHLIGHT

  2. QUASI-PERIODIC MODE HOPPING IN COMPETING IONIZATION WAVES DOE Plasma Science Center Control of Plasma Kinetics • Neon-ionization-wave normal modes compete as coupled spatiotemporal oscillators modulated by resonant laser light chopped almost synchronously with the subdominant wave mode resulting in indefinite mode hopping. • The mode-amplitude normalization of the driving term in the differential equations, inherent in driven-oscillator phenomena and responsible for quasi-periodic mode hopping, is validated by experimental observations. • Amount that spatiotemporal driving-force amplitude MST exceeds temporal driving-force amplitude MT increases as the spatiotemporal entrainment threshold is approached. HIGHLIGHT PLSC_0213

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