Title :
Prolonged plasma production at current-driven implosion of wire arrays on Angara-5-1 facility
Author :
Alexandrov, V.V. ; Frolov, I.N. ; Fedulov, M.V. ; Grabovsky, E.V. ; Mitrofanov, K.N. ; Nedoseev, S.L. ; Oleinik, G.M. ; Porofeev, I.Yu. ; Samokhin, A.A. ; Sasorov, P.V. ; Smirnov, V.P. ; Volkov, G.S. ; Zurin, M.M. ; Zukakischvili, G.G.
Author_Institution :
Troitsk Inst. for Innovation & Thermonucl. Investigation, Russia
fDate :
4/1/2002 12:00:00 AM
Abstract :
Results of experimental investigation and modeling of prolonged plasma production during implosion of cylindrical wire arrays are presented. Results of the radiography of dense cores of imploding wire array and the measurements of internal azimuthal magnetic field in wire array give new experimental evidences of prolonged plasma production phenomenon. This phenomenon is an important property of current-driven implosion of the wire arrays at current rise rates ∼(0.5-1)1014 A/s. The prolonged plasma production can determine the current and the density profiles before final stage of a Z pinch compression, and also in the moment of Z pinch stagnation. From this point of view, the requirement that residual uncompressed plasma should not shunt the current at the discharge periphery becomes of the greatest importance. The conditions exist when the prolonged plasma production isn´t an obstacle for the achievement of high-power X-ray emission from Z pinch. Presented experimental results on multiwire array implosion can be explained on the basis of prolonged plasma production without referring to multiwire array azimuthal structure.
Keywords :
Z pinch; exploding wires; plasma production; plasma transport processes; radiography; Angara-5-1 facility; X pinch backlighting; Z pinch stagnation; azimuthal asymmetry; current profiles; current shunting; current-driven implosion; cylindrical wire arrays; dense cores; density profiles; discharge periphery; heterogeneous plasma producing matter; imploding wire array; internal azimuthal magnetic field; multiwire array implosion; near-wire region; plasma production; prolonged plasma production; radiography; residual uncompressed plasma; super terawatt Z pinch; temporal profiles; total current; Magnetic field measurement; Plasma density; Plasma measurements; Plasma properties; Plasma sources; Plasma x-ray sources; Production; Surface resistance; Thermal conductivity; Wire;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2002.1024290