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Title: Study of Plasma Flow Modes in Imploding Nested Arrays

Abstract

Results from experimental studies of implosion of nested wire and fiber arrays at currents of up to 4 МА at the Angara-5-1 facility are presented. Depending on the ratio between the radii of the inner and outer arrays, different modes of the plasma flow in the space between the inner and outer arrays were implemented: the sub-Alfvénic (V{sub r} < V{sub А}) and super-Alfvénic (V{sub r} > V{sub А}) modes and a mode with the formation of the transition shock wave (SW) region between the cascades. By varying the material of the outer array (tungsten wires or kapron fibers), it is shown that the plasma flow mode between the inner and outer arrays depends on the ratio between the plasma production rates ṁ{sub in} /ṁ{sub out} in the inner and outer arrays. The obtained experimental results are compared with the results of one-dimensional MHD simulation of the plasma flow between the arrays. Stable implosion of the inner array plasma was observed in experiments with combined nested arrays consisting of a fiber outer array and a tungsten inner array. The growth rates of magnetic Rayleigh−Taylor (MRT) instability in the inner array plasma at different numbers of fibers in the outer arraymore » and different ratios between the radii of the inner and outer arrays are compared. Suppression of MRT instability during the implosion of the inner array plasma results in the formation of a stable compact Z-pinch and generation of a soft X-ray pulse. A possible scenario of interaction between the plasmas of the inner and outer arrays is offered. The stability of the inner array plasma in the stage of final compression depends on the character of interaction of plasma jets from the outer array with the magnetic field of the inner array.« less

Authors:
; ; ; ; ; ;  [1];  [2];  [1]
  1. Troitsk Institute for Innovation and Fusion Research (Russian Federation)
  2. Russian Academy of Sciences, Keldysh Institute of Applied Mathematics (Russian Federation)
Publication Date:
OSTI Identifier:
22763299
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 44; Journal Issue: 2; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; ONE-DIMENSIONAL CALCULATIONS; PLASMA JETS; PLASMA PRODUCTION; SOFT X RADIATION; TUNGSTEN

Citation Formats

Mitrofanov, K. N., E-mail: mitrofan@triniti.ru, Aleksandrov, V. V., Gritsuk, A. N., Branitsky, A. V., Frolov, I. N., Grabovski, E. V., Sasorov, P. V., Ol’khovskaya, O. G., and Zaitsev, V. I.. Study of Plasma Flow Modes in Imploding Nested Arrays. United States: N. p., 2018. Web. doi:10.1134/S1063780X18020101.
Mitrofanov, K. N., E-mail: mitrofan@triniti.ru, Aleksandrov, V. V., Gritsuk, A. N., Branitsky, A. V., Frolov, I. N., Grabovski, E. V., Sasorov, P. V., Ol’khovskaya, O. G., & Zaitsev, V. I.. Study of Plasma Flow Modes in Imploding Nested Arrays. United States. doi:10.1134/S1063780X18020101.
Mitrofanov, K. N., E-mail: mitrofan@triniti.ru, Aleksandrov, V. V., Gritsuk, A. N., Branitsky, A. V., Frolov, I. N., Grabovski, E. V., Sasorov, P. V., Ol’khovskaya, O. G., and Zaitsev, V. I.. Thu . "Study of Plasma Flow Modes in Imploding Nested Arrays". United States. doi:10.1134/S1063780X18020101.
@article{osti_22763299,
title = {Study of Plasma Flow Modes in Imploding Nested Arrays},
author = {Mitrofanov, K. N., E-mail: mitrofan@triniti.ru and Aleksandrov, V. V. and Gritsuk, A. N. and Branitsky, A. V. and Frolov, I. N. and Grabovski, E. V. and Sasorov, P. V. and Ol’khovskaya, O. G. and Zaitsev, V. I.},
abstractNote = {Results from experimental studies of implosion of nested wire and fiber arrays at currents of up to 4 МА at the Angara-5-1 facility are presented. Depending on the ratio between the radii of the inner and outer arrays, different modes of the plasma flow in the space between the inner and outer arrays were implemented: the sub-Alfvénic (V{sub r} < V{sub А}) and super-Alfvénic (V{sub r} > V{sub А}) modes and a mode with the formation of the transition shock wave (SW) region between the cascades. By varying the material of the outer array (tungsten wires or kapron fibers), it is shown that the plasma flow mode between the inner and outer arrays depends on the ratio between the plasma production rates ṁ{sub in} /ṁ{sub out} in the inner and outer arrays. The obtained experimental results are compared with the results of one-dimensional MHD simulation of the plasma flow between the arrays. Stable implosion of the inner array plasma was observed in experiments with combined nested arrays consisting of a fiber outer array and a tungsten inner array. The growth rates of magnetic Rayleigh−Taylor (MRT) instability in the inner array plasma at different numbers of fibers in the outer array and different ratios between the radii of the inner and outer arrays are compared. Suppression of MRT instability during the implosion of the inner array plasma results in the formation of a stable compact Z-pinch and generation of a soft X-ray pulse. A possible scenario of interaction between the plasmas of the inner and outer arrays is offered. The stability of the inner array plasma in the stage of final compression depends on the character of interaction of plasma jets from the outer array with the magnetic field of the inner array.},
doi = {10.1134/S1063780X18020101},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 2,
volume = 44,
place = {United States},
year = {2018},
month = {2}
}