Skip to main content
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
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
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
File Type
© 1999 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
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: