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Title: Shock waves in a Z-pinch and the formation of high energy density plasma

Abstract

A Z-pinch liner, imploding onto a target plasma, evolves in a step-wise manner, producing a stable, magneto-inertial, high-energy-density plasma compression. The typical configuration is a cylindrical, high-atomic-number liner imploding onto a low-atomic-number target. The parameters for a terawatt-class machine (e.g., Zebra at the University of Nevada, Reno, Nevada Terawatt Facility) have been simulated. The 2-1/2 D MHD code, MACH2, was used to study this configuration. The requirements are for an initial radius of a few mm for stable implosion; the material densities properly distributed, so that the target is effectively heated initially by shock heating and finally by adiabatic compression; and the liner's thickness adjusted to promote radial current transport and subsequent current amplification in the target. Since the shock velocity is smaller in the liner, than in the target, a stable-shock forms at the interface, allowing the central load to accelerate magnetically and inertially, producing a magneto-inertial implosion and high-energy density plasma. Comparing the implosion dynamics of a low-Z target with those of a high-Z target demonstrates the role of shock waves in terms of compression and heating. In the case of a high-Z target, the shock wave does not play a significant heating role. The shock waves carrymore » current and transport the magnetic field, producing a high density on-axis, at relatively low temperature. Whereas, in the case of a low-Z target, the fast moving shock wave preheats the target during the initial implosion phase, and the later adiabatic compression further heats the target to very high energy density. As a result, the compression ratio required for heating the low-Z plasma to very high energy densities is greatly reduced.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Magneto-Inertial Fusion Technologies Inc. (MIFTI), Irvine, California 92612 (United States) and Department of Physics, University of California Irvine, Irvine, California 92697 (United States)
  2. Department of Physics, University of California Irvine, Irvine California 92697 (United States)
  3. Mount San Jacinto College, Menifee, California 92584 (United States)
  4. University of Nevada, Reno, 1664 N. Virginia St., Reno, Nevada 89557-0208 (United States)
  5. Department of Mathematics and Statistics, FBAS, IIU, Islamabad (Pakistan) and Department of Mechanical Engineering, University of California Riverside, Riverside, California 92521 (United States)
  6. Department of Mechanical and Aerospace Engineering and Center for Energy Research, University of California San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
22072639
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 12; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATOMIC NUMBER; COMPRESSION RATIO; CURRENTS; CYLINDRICAL CONFIGURATION; ENERGY DENSITY; IMPLOSIONS; LINEAR Z PINCH DEVICES; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; PLASMA; SHOCK HEATING; SHOCK WAVES; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Rahman, H U, Wessel, F J, Ney, P, Presura, R, Ellahi, Rahmat, and Shukla, P K. Shock waves in a Z-pinch and the formation of high energy density plasma. United States: N. p., 2012. Web. doi:10.1063/1.4769264.
Rahman, H U, Wessel, F J, Ney, P, Presura, R, Ellahi, Rahmat, & Shukla, P K. Shock waves in a Z-pinch and the formation of high energy density plasma. United States. doi:10.1063/1.4769264.
Rahman, H U, Wessel, F J, Ney, P, Presura, R, Ellahi, Rahmat, and Shukla, P K. Sat . "Shock waves in a Z-pinch and the formation of high energy density plasma". United States. doi:10.1063/1.4769264.
@article{osti_22072639,
title = {Shock waves in a Z-pinch and the formation of high energy density plasma},
author = {Rahman, H U and Wessel, F J and Ney, P and Presura, R and Ellahi, Rahmat and Shukla, P K},
abstractNote = {A Z-pinch liner, imploding onto a target plasma, evolves in a step-wise manner, producing a stable, magneto-inertial, high-energy-density plasma compression. The typical configuration is a cylindrical, high-atomic-number liner imploding onto a low-atomic-number target. The parameters for a terawatt-class machine (e.g., Zebra at the University of Nevada, Reno, Nevada Terawatt Facility) have been simulated. The 2-1/2 D MHD code, MACH2, was used to study this configuration. The requirements are for an initial radius of a few mm for stable implosion; the material densities properly distributed, so that the target is effectively heated initially by shock heating and finally by adiabatic compression; and the liner's thickness adjusted to promote radial current transport and subsequent current amplification in the target. Since the shock velocity is smaller in the liner, than in the target, a stable-shock forms at the interface, allowing the central load to accelerate magnetically and inertially, producing a magneto-inertial implosion and high-energy density plasma. Comparing the implosion dynamics of a low-Z target with those of a high-Z target demonstrates the role of shock waves in terms of compression and heating. In the case of a high-Z target, the shock wave does not play a significant heating role. The shock waves carry current and transport the magnetic field, producing a high density on-axis, at relatively low temperature. Whereas, in the case of a low-Z target, the fast moving shock wave preheats the target during the initial implosion phase, and the later adiabatic compression further heats the target to very high energy density. As a result, the compression ratio required for heating the low-Z plasma to very high energy densities is greatly reduced.},
doi = {10.1063/1.4769264},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 19,
place = {United States},
year = {2012},
month = {12}
}