Compression and Burn in the Presence of Low-Mode Asymmetries for Double Shells

We previously reported a metric for robust burn in double shell implosions where the specific power deposited by alpha-heating must exceed the specific power due to expansion cooling losses of the hot spot [1, 2]. This criterion results in a minimum hot spot temperature at stagnation in the absence of burn. Margin is obtained for designs by the degree that they exceed this minimum no-burn temperature. In this present work, we extend this model to include simple low-mode asymmetry using a quasi-adiabatic approximation, and compare predictions of this model to 2D HYDRA simulations of double shell capsules. We further examine requirements during the compression phase to achieve the requisite hot spot conditions.

[1] D.S. Montgomery, W.S. Daughton et al., BAPS.2017.DPP.NO7.1; [2] D.S. Montgomery, W.S. Daughton et al., submitted to Phys. Plasmas (2018).