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Title: Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies

Abstract

Hohlraums of full ignition scale (6-mm diameter by 7-mm length) have been heated by x-rays from a z-pinch target on Z to a variety of temperatures and pulse shapes which can be used to simulate the early phases of the National Ignition Facility (NIF) temperature drive. The pulse shape is varied by changing the on-axis target of the z pinch in a static-wall-hohlraum geometry. A 2-{micro}m-thick walled Cu cylindrical target of 8-mm diameter filled with 10 mg/cm{sup 3} CH, for example, produces foot-pulse conditions of {minus}85 eV for a duration of {approximately} 10 ns, while a solid cylindrical target of 5-mm diameter and 14-mg/cm{sup 3} CH generates first-step-pulse conditions of {approximately} 122 eV for a duration of a few ns. Alternatively, reducing the hohlraum size (to 4-mm diameter by 4-mm length) with the latter target has increased the peak temperature to {approximately} 150 eV, which is characteristic of a second-step-pulse temperature. In general, the temperature T of these x-ray driven hohlraums is in agreement with the Planckian relation (T-(P/A){sup 1/4}). P is the measured x-ray input power and A is the surface area of the hohlraum. Fully-integrated 2-D radiation-hydrodynamic simulations of the z pinch and subsequent hohlraum heating show plasmamore » densities within the useful volume of the hohlraums to be on the order of air or less.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
10341
Report Number(s):
SAND99-0662C
TRN: US0103386
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: First International Conference on Inertial Fusion Sciences and Applications, Bordeaux (FR), 09/12/1999--09/17/1999; Other Information: PBD: 25 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SURFACE AREA; TARGETS; US NATIONAL IGNITION FACILITY; INDIRECT DRIVE ICF; X RADIATION; CAVITIES; HEATING; PLASMA DENSITY

Citation Formats

Sandord, T.W.L., Olson, R.E., Chandler, G.A., Hebron, D.E., Mock, R.C., Leeper, R.J., Nash, T.J., Ruggles, L.E., Simpson, W.W., Struve, K.W., Vesey, R.A., Bowers, R.L., Matuska, W., Peterson, D.L., and Peterson, R.R. Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies. United States: N. p., 1999. Web.
Sandord, T.W.L., Olson, R.E., Chandler, G.A., Hebron, D.E., Mock, R.C., Leeper, R.J., Nash, T.J., Ruggles, L.E., Simpson, W.W., Struve, K.W., Vesey, R.A., Bowers, R.L., Matuska, W., Peterson, D.L., & Peterson, R.R. Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies. United States.
Sandord, T.W.L., Olson, R.E., Chandler, G.A., Hebron, D.E., Mock, R.C., Leeper, R.J., Nash, T.J., Ruggles, L.E., Simpson, W.W., Struve, K.W., Vesey, R.A., Bowers, R.L., Matuska, W., Peterson, D.L., and Peterson, R.R. Wed . "Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies". United States. https://www.osti.gov/servlets/purl/10341.
@article{osti_10341,
title = {Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies},
author = {Sandord, T.W.L. and Olson, R.E. and Chandler, G.A. and Hebron, D.E. and Mock, R.C. and Leeper, R.J. and Nash, T.J. and Ruggles, L.E. and Simpson, W.W. and Struve, K.W. and Vesey, R.A. and Bowers, R.L. and Matuska, W. and Peterson, D.L. and Peterson, R.R.},
abstractNote = {Hohlraums of full ignition scale (6-mm diameter by 7-mm length) have been heated by x-rays from a z-pinch target on Z to a variety of temperatures and pulse shapes which can be used to simulate the early phases of the National Ignition Facility (NIF) temperature drive. The pulse shape is varied by changing the on-axis target of the z pinch in a static-wall-hohlraum geometry. A 2-{micro}m-thick walled Cu cylindrical target of 8-mm diameter filled with 10 mg/cm{sup 3} CH, for example, produces foot-pulse conditions of {minus}85 eV for a duration of {approximately} 10 ns, while a solid cylindrical target of 5-mm diameter and 14-mg/cm{sup 3} CH generates first-step-pulse conditions of {approximately} 122 eV for a duration of a few ns. Alternatively, reducing the hohlraum size (to 4-mm diameter by 4-mm length) with the latter target has increased the peak temperature to {approximately} 150 eV, which is characteristic of a second-step-pulse temperature. In general, the temperature T of these x-ray driven hohlraums is in agreement with the Planckian relation (T-(P/A){sup 1/4}). P is the measured x-ray input power and A is the surface area of the hohlraum. Fully-integrated 2-D radiation-hydrodynamic simulations of the z pinch and subsequent hohlraum heating show plasma densities within the useful volume of the hohlraums to be on the order of air or less.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

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