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Charged-particle spectroscopy for diagnosing shock ρR and strength in NIF implosionsa)
a)Contributed paper, published as part of the Proceedings of the 19th Topical Conference on High-Temperature Plasma Diagnostics, Monterey, California, May 2012.
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View: Figures


Image of FIG. 1.
FIG. 1.

D3He proton energy versus total ρR, calculated using the Li-Petrasso22 dE/dx for various ρR models: in a carbon-hydrogen (CH) plasma for the compression phase (dashed gray) and the shock phase (dotted gray). The black curve represents a HYDRA-derived model with error bars represented by the gray shaded region.

Image of FIG. 2.
FIG. 2.

Schematic of the experimental setup at NIF. The hohlraum is shown with capsule inside. The DIM (0,0) WRFs view the implosion through the laser entrance hole (LEH) at an angle of 11.5° to the hohlraum axis, while the DIM (90,78) WRFs view through the hohlraum wall at an angle of 14° to the equator.

Image of FIG. 3.
FIG. 3.

D3He proton spectrum measured on NIF shot N110208 (1.3 MJ shape tuning shot with a 544 Au hohlraum) on DIM (90,78) (a) and DIM (0,0) (b). The downshift from the birth energy at 14.7 MeV (dashed line) gives the ρR. Gaussian fits to the shock peak are shown in gray. On the equator, Y p = (2.43 ± 0.44) × 108 and E = 11.79 ± 0.14 MeV, corrected for the hohlraum downshift, corresponding to ρR = 68 ± 8 mg/cm2. On the pole, we measured a yield of Y p = (1.48 ± 0.35) × 107 and E = 11.90 ± 0.26 MeV corresponding to ρR = 65 ± 10 mg/cm2.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Charged-particle spectroscopy for diagnosing shock ρR and strength in NIF implosionsa)