Characterization of diagnostic hole-closure in Z-pinch driven hohlraums

In this article we investigate the partial closure of diagnostic holes in Z-pinch driven hohlraums. These hohlraums differ from current laser-driven hohlraums in a number of ways such as their larger size, greater x-ray drive energy, and lower temperature. Although the diameter of the diagnostic hol...

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Bibliographic Details
Published in:Physics of plasmas 2000-02, Vol.7 (2), p.681-688
Main Authors: Baker, K. L., Porter, J. L., Ruggles, L. E., Chandler, G. A., Deeney, Chris, Vargas, M., Moats, Ann, Struve, Ken, Torres, J., McGurn, J. S., Simpson, W. W., Fehl, D. L., Jobe, D. O., Chrien, R. E., Matuska, W., Idzorek, G. C.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABLATION
EXPERIMENTAL DATA
HOLES
INERTIAL CONFINEMENT
ION TEMPERATURE
LASER-PRODUCED PLASMA
LINEAR Z PINCH DEVICES
PINCH DEVICES
PINCH EFFECT
PLASMA DIAGNOSTICS
THEORETICAL DATA
WALL EFFECTS
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Summary:In this article we investigate the partial closure of diagnostic holes in Z-pinch driven hohlraums. These hohlraums differ from current laser-driven hohlraums in a number of ways such as their larger size, greater x-ray drive energy, and lower temperature. Although the diameter of the diagnostic holes on these Z-pinch driven hohlraums can be much greater than their laser-driven counterparts, 4 mm in diameter or larger, radiation impinges on the wall material surrounding the hole for the duration of the Z pinch, nearly 100 ns. This incident radiation causes plasma to ablate from the hohlraum walls surrounding the diagnostic hole and partially obscure this diagnostic hole. This partial obscuration reduces the effective area over which diagnostics view the hohlraum’s radiation. This reduction in area can lead to an underestimation of the wall temperature when nonimaging diagnostics such as x-ray diodes and bolometers are used to determine power and later to infer a wall temperature. In this article we describe the techniques used to characterize the hole-closure in these hohlraums and present the experimental measurements of this process.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.873852