The chaos ontrol in parametric decay instability by a pump 通过泵参数衰变不稳定性的混沌控制.docVIP

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The chaos ontrol in parametric decay instability by a pump 通过泵参数衰变不稳定性的混沌控制.doc

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The chaos ontrol in parametric decay instability by a pump 通过泵参数衰变不稳定性的混沌控制

INFLUENCE OF NITROGEN IMPURITIES ON AN ELECTRON-EXCITED HELIUM ATOM CONCENTRATION IN THE SELF-SUSTAINED NORMAL DC GLOW DISCHARGE AT ATMOSPHERIC PRESSURE V.I. Arkhipenko, A.A. Kirillov, L.V. Simonchik, S.M. Zgirouski Institute of Molecular and Atomic Physics NASB, Minsk, Belarus; simon@imaph.bas-net.by The influence of nitrogen impurities on the parameters of the self-sustained normal dc glow discharge at atmospheric pressure was studied. The concentrations of the low-excited helium atoms in states 21s, 21p, 23s and 23p were determined in the atmospheric pressure glow discharge in helium (99.98%He) and in helium with a nitrogen admixture. It was shown that the adding of nitrogen into helium (less 5%) leads to the increase of both interelectrode gap voltage and gas temperature. At the same time the drastically reduction of concentration of the low-excited helium atoms in cathode region even at nitrogen admixture of 0.5 % is occurred. I. INTRODUCTION There is large increasing interest in atmospheric pressure glow discharges (APGD) because they can be used for a wide range of technological applications without the need of vacuum systems. As a rule, helium in mixture with other gases is used as working gas in discharges at atmospheric pressure [1, 2]. However, at present there isn’t a complete understanding of the gas discharge physics in gas mixtures at atmospheric pressure. As it was shown in [2], for example, a small addition of other gases (~1%) into working gas of barrier discharge plays a significant role in stability of this discharge. On the base of numerical calculation it is approved in [3] that even the residual gas admixtures with concentration ~0.5?10-4 % exert a significant influence on both the plasma composition and the gas discharge parameters in atmospheric pressure discharge. The self-sustained normal dc APGD in helium [4] is a convenient object for investigations of the kinetics of the weakly ionized nonequilibrium plasma with complicated compositi