Time history prediction of direct-drive implosions on the Omega facility | Zendy

S. Laffite | Zendy; J. L. Bourgade | Zendy; T. Caillaud | Zendy; J. A. Delettrez | Zendy; J. A. Frenje | Zendy; Fabien Girard | Zendy; V. Yu. Glebov | Zendy; T. R. Joshi | Zendy; O. Landoas | Zendy; Guillaume Legay | Zendy; Sébastien Lemaire | Zendy; R. C. Mancini | Zendy; F. J. Marshall | Zendy; L. Massé | Zendy; P. E. Masson-Laborde | Zendy; D. T. Michel | Zendy; F. Philippe | Zendy; C. Reverdin | Zendy; W. Seka | Zendy; V. Tassin | Zendy

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Time history prediction of direct-drive implosions on the Omega facility

Author(s) -

S. Laffite,

J. L. Bourgade,

T. Caillaud,

J. A. Delettrez,

J. A. Frenje,

Fabien Girard,

V. Yu. Glebov,

T. R. Joshi,

O. Landoas,

Guillaume Legay,

Sébastien Lemaire,

R. C. Mancini,

F. J. Marshall,

L. Massé,

P. E. Masson-Laborde,

D. T. Michel,

F. Philippe,

C. Reverdin,

W. Seka,

V. Tassin

Publication year - 2016

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.4939833

Subject(s) - implosion , physics , omega , pulse (music) , laser , plasma , optics , coupling (piping) , stability (learning theory) , nova (rocket) , atomic physics , nuclear physics , computational physics , aerospace engineering , quantum mechanics , machine learning , detector , computer science , engineering , mechanical engineering

We present in this article direct-drive experiments that were carried out on the Omega facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Two different pulse shapes were tested in order to vary the implosion stability of the same target whose parameters, dimensions and composition, remained the same. The direct-drive configuration on the Omega facility allows the accurate time-resolved measurement of the scattered light. We show that, provided the laser coupling is well controlled, the implosion time history, assessed by the “bang-time” and the shell trajectory measurements, can be predicted. This conclusion is independent on the pulse shape. In contrast, we show that the pulse shape affects the implosion stability, assessed by comparing the target performances between prediction and measurement. For the 1-ns square pulse, the measured neutron number is about 80% of the prediction. For the 2-step 2-ns pulse, we test here that this ratio falls to about 20%.

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