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Investigation of plasma instabilities in the stagnated Z pinch

V. V. Ivanov1, J. P. Chittenden2, R. C. Mancini1, D. Papp1, N. Niasse2, S. D. Altemara1, and A. A. Anderson1

  • 1Department of Physics, University of Nevada, Reno, Nevada 89557, USA
  • 2Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom

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Phys. Rev. E 86, 046403 – Published 22 October, 2012

DOI: https://doi.org/10.1103/PhysRevE.86.046403

Abstract

High-resolution laser probing diagnostics at a wavelength of 266 nm allow observation of the internal structure and instabilities in dense stagnated Z pinches, typically hidden by trailing material. The internal structure of the 1-MA Z pinch includes strong kink and sausage instabilities, loops, flares, and disruptions. Mid- and small-scale density perturbations develop in the precursor and main pinch. The three-dimensional shape and dynamics of the wire-array Z pinch are predetermined by the initial configuration of the wire array. Cylindrical, linear, and star wire-array Z pinches present different sets of instabilities seeded to the pinch at the implosion stage. Prolonged implosion of trailing mass can enhance x-ray production in wire arrays. Fast plasma motion with a velocity >100 km/s was observed in the Z pinch at stagnation with two-frame shadowgraphy. Development of instabilities in wire arrays is in agreement with three-dimensional magnetohydrodynamic simulations.

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Phys. Rev. E 86, 046403– Published 22 October, 2012
  • Received 16 July 2012
Article part of CHORUS

©2012 American Physical Society

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