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

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, remain...

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Bibliographic Details
Published in:Physics of plasmas 2016-01, Vol.23 (1)
Main Authors: Laffite, S., Bourgade, J. L., Caillaud, T., Girard, F., Landoas, O., Lemaire, S., Masse, L., Masson-Laborde, P. E., Philippe, F., Reverdin, C., Tassin, V., Delettrez, J. A., Glebov, V. Yu, Marshall, F. J., Michel, D. T., Seka, W., Frenje, J. A., Joshi, T., Mancini, R. C., Legay, G.
Format: Article
Language:English
Subjects:
CONFIGURATION
COUPLING
DIRECT DRIVE LASER IMPLOSION
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LASERS
NEUTRONS
OMEGA FACILITY
PULSE SHAPERS
PULSES
STABILITY
TIME RESOLUTION
VISIBLE RADIATION
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Summary: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%.
ISSN:1070-664X
1089-7674