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Article
Foot-Pulse Radiation Drive Necessary for ICF Ignition Capsule Demonstrated on Z Generator
IEEE Conference Record
  • Ronald E. Olson, Missouri University of Science and Technology
  • L. E. Ruggles
  • W. W. Simpson
  • T. W. L. Sanford
  • G. A. Chandler
  • D. L. Fehl
  • J. S. Lash
  • R. J. Leeper
  • K. W. Struve
  • R. A. Vesey
  • M. S. Derzon
  • T. J. Nash
  • W. A. Stygar
  • R. C. Mock
  • D. E. Hebron
  • T. L. Gilliland
  • D. O. Jobe
  • J. S. McGurn
  • J. F. Seamen
  • J. A. Torres
  • M. F. Vargars
  • D. L. Peterson
Abstract

Summary form only given. Implosion and ignition of an indirectly-driven ICF capsule operating near a Fermi-degenerate isentrope requires initial Planckian-radiation-drive temperatures of 70-to-90 eV to be present for a duration of 10-to-15 ns prior to the main drive pulse. Such capsules are being designed for high pulsed-power generators such as X1. This foot-pulse drive capability has been recently demonstrated in a NIF-sized (6-mm 1=7-mm), gold hohlraum, using a one-sided static-wall hohlraum geometry on the Z generator. The general arrangement utilized nested tungsten-wire arrays of radii (mass) 20 mm (2 mg) and 10 mm (1 mg) that had an axial length of -10 mm. The arrays were driven by a peak current of -21 MA and were made to implode on a 2-μm-thick Cu annulus (mass=4.5 mg), which had a radius of 4 mm and was filled with a low-density CH foam, all centered about the z-axis. The gold hohlraum was mounted on axis and above the Cu/foam target. A 2.9-mm-radius axial hole between the top of the target and hohlraum permitted the X-rays generated from the implosion to enter the hohlraum. The radiation within the hohlraum was monitored by viewing the hohlraum through a 3-mm diameter hole on the lateral side of the hohlraum with a suite of diagnostics. The radiation entering the hohlraum was estimated by an additional suite of on-axis diagnostics, in a limited number of separate shots, when the hohlraum was not present. Additionally, the radiation generated outside the Cu annulus was monitored, for all shots, through a 3-mm diameter aperture located on the outside of the current return can

Department(s)
Physics
Keywords and Phrases
  • 21 MA,
  • 70 to 90 EV,
  • Au,
  • Cu,
  • Cu Annulus,
  • Fermi-Degenerate Isentrope,
  • ICF Ignition Capsule,
  • NIF-Sized Au Hohlraum,
  • Planckian-Radiation-Drive Temperature,
  • W,
  • X-Rays Generation,
  • Z Generator,
  • Z Pinch,
  • Exploding Wires,
  • Foot-Pulse Drive Capability,
  • Foot-Pulse Radiation Drive,
  • High Pulsed-Power Generators,
  • Ignition,
  • Implosion,
  • Low-Density CH Foam,
  • Nested W-Wire Arrays,
  • On-Axis Diagnostics,
  • One-Sided Static-Wall Hohlraum Geometry,
  • Plasma Density,
  • Plasma Inertial Confinement,
  • Plasma Temperature
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1999 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
1-1-1999
Disciplines
Citation Information
Ronald E. Olson, L. E. Ruggles, W. W. Simpson, T. W. L. Sanford, et al.. "Foot-Pulse Radiation Drive Necessary for ICF Ignition Capsule Demonstrated on Z Generator" IEEE Conference Record (1999)
Available at: http://works.bepress.com/ronald-olson/21/