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Title: 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, remained the same. The direct-drive configuration on the Omega facility allows the accurate time-resolvedmeasurement 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 measuredneutron number is about 80% of the prediction. Lastly, for the 2-step 2-ns pulse, we test here that this ratio falls to about 20%.
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [2] ;  [4] ;  [1] ;  [5] ;  [1] ;  [4] ;  [2] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [1]
  1. CEA, DAM, DIF, Arpajon (France)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Univ. of Nevada, Reno, NV (United States)
  5. CEA, CVA, Is-sur-Tille (France)
Publication Date:
Report Number(s):
Journal ID: ISSN 1070-664X
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 1; Journal ID: ISSN 1070-664X
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
CEA, France; USDOE
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; neutrons; hydrological modeling; laser ablation; thermal conduction; time resolved spectroscopy
OSTI Identifier: