krasik.pptVIP

* * UEWE: Radiation Short pulse emission (?300 ns) (during the wire explosion from the wire surface) Long pulse emission (?100 μs) is a result of a growth of emitting area due to creation of micro-particles and their relatively long cooling Spectrally resolved radiation MHD Calculations Mass conservation Momentum conservation Energy conservation Maxwell equations Ohm law Equations of state Transport parameters Surface temperature ~ 2 eV On axis pressure ~ 400 kBar Experimental MHD calculation results of the explosion of Cu (L=100mm, ?100μm) wire Solid curves – experimental results Dashed curves – MHD calculation. MHD Calculations Time [ns] Parametric Similarity Cylindrical Geometry Implosion Due to the cumulation effect of the converging SW it is possible to achieve ultra-high pressure at the axis of implosion Self-similarity problem R ? t? In the case of diverging SW (total energy of the explosion is conserved in the volume limited by the SW) the parameter ? can be determined using dimensional analysis of physical parameters In the case of implosion the energy in the volume between the SW and the exploding liner is not conserved: thus ? cannot be determined without hydro-dynamic numerical simulations. Initial energy Initial radius α ~ 0.6 - spherical implosion α ~ 0.75 - cylindrical implosion A. Grinenko, V. Gurovich,Ya. Krasik, Phys. Plasmas 14, 012701 (2007). V. Gurovich, A. Grinenko, Ya. Krasik, PRL 99, 124503 (2007). Streak image of the implosion with a cylindrical wire array Implosion – Experimental Setup Imploding array Target Implosion wave Ya. E. Krasik, A. Sayapin, A Grinenko, and V. Tz. Gurovich, Phys. Rev. E 73, 057301 (2006). 40ty 50?m dia Cu-wire array Cylindrical SW Implosion 40 Cu wires (?0.1mm) array (R0 = 2.5 mm) The pressure is estimated as ~400 ? 50 kbar at r = 0.1 mm (4.5 kJ microsecond setup) Initi