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Z-Pinch Generated X-Rays in Static-Wall Hohlraum Geometry Demonstrate Potential for Indirect-Drive ICF Studies [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1999.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
21 pages : digital, PDF file
Additional Creators:
Sandia National Laboratories, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Hohlraums of full ignition scale (6-mm diameter by 7-mm length) have been heated by x-rays from a z-pinch magnet 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/cm³ CH, for example, produces foot-pulse conditions of ≈85 eV for a duration of ≈10 ns, while a solid cylindrical target of 5-mm diameter and 14-mg/cm³ CH generates first-step-pulse conditions of ≈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 ≈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.
Report Numbers:
E 1.99:sand99-0662
sand99-0662
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Note:
Published through SciTech Connect.
11/01/1999.
"sand99-0662"
OLSON,CRAIG L.; LEEPER,RAMON J.; STRUVE,KENNETH W.; SIMPSON,WALTER W.; CHANDLER,GORDON A.; HEBRON,DAVID E.; SH,THOMAS J.; SANFORD,THOMAS W. L.; VESEY,ROGER A.; MOCK,RAYMOND CECIL; RUGGLES,LAURENCE E.; BOWERS,RICHARD; MATUSLKA,WALTER; PETERSON,BOB; PETERSON,DARRELL.
Type of Report and Period Covered Note:
Topical;
Funding Information:
AC04-94AL85000
View MARC record | catkey: 14742316