Dust particles charge experimental evaluation in laser induced high pressure colloid plasma flows

Egor Y Loktionov,Yury Yu Protasov,Yury S Protasov

doi:10.1109/plasma.2014.7012425

Abstract

Summary form only given. We propose a laser ablation method of generating high-pressure colloid plasma flows- UV laser ablation of a polymer matrix with a dust component introduced into it. The method is based on the difference in laser ablation spectral-energy thresholds of polymer materials and dust components in the short-wavelength spectral region. We studied the spatiotemporal dynamics and macrostructure of laser-induced colloid plasma flows and dust particles charge in them. Such conditions are possible under action of shortwave radiation (λ~213 nm) on easily ablating polymeric media ((C 2 F 4 ) n ) containing transparent dielectric particles (SiO 2 ). Electron concentration in plasma (n e ~10 18 cm -3 ) and dust particle charge (z~1,5·10 8 e) achievable in this way enable us to carry out investigations in a previously unstudied range of parameters. The comparative analysis of the known data on the dust particle charge with those obtained in this work shows that there exists a dependence of the dust particle charge (z/R d 2 ) on the electron concentration in plasma carrier ranged n e ~10 8 -10 18 cm -3 , which is close to that for the power (with the superscript exponent equal to ~0.25). This is of practical interest for solving a number of interesting problems arising in the development of different high power density plasma facilities.

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