Reproducibility of hohlraum-driven implosion symmetry on the National Ignition Facility
1 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2 Lawrence Livermore National Laboratory, Livermore, CA 94551, USA
3 General Atomics, San Diego, CA 92121, USA
Published online: 15 November 2013
Indirectly driven Symcap capsules are used at the NIF to obtain information about ignition capsule implosion performance, in particular shape. Symcaps replace the cryogenic fuel layer with an equivalent ablator mass and can be similarly diagnosed. Symcaps are good symmetry surrogates to an ignition capsule after the peak of the drive, radiation-hydrodynamics simulations predict that doping of the symcaps vary the behavior of the implosion. We compare the equatorial shapes of a symcap doped with Si or Ge, as well as examine the reproducibility of the shape measurement using two symcaps with the same hohlraum and laser conditions.
© Owned by the authors, published by EDP Sciences, 2013
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