Sensitivity of Double-Shell Ignition Capsules to Asymmetric Drive

Double-shell (DS) targets [1] present an alternative approach to ignition via the cryogenic single-shell point design [2]. Although these targets present unique fabrication challenges, they embody many attractive features, including non-cryogenic fielding and low threshold temperatures ($\sim$4 keV) for volume ignition [3-4]. We have used 2D radiation-hydrodynamic modeling to survey the behavior of DS targets under asymmetric temperature drive in rugby vacuum hohlraums. The yield is robust against deviations from symmetric illumination, varying smoothly as a function of the imposed $P_{2}$ and $P_{4}$ amplitudes. Ignition occurs even when 10\% or more of the drive is contained in Legendre $P_{2}$ or $P_{4}$ components, with yield reductions on the order of 50\% for the most extreme cases investigated here. \\ \\ $[$1$]$ P. Amendt et al., Phys. of Plasmas 9, 2221 (2002) \\ $[$2$]$ D. A. Callahan et al., Phys. of Plasmas 13, 56307 (2005) \\ $[$3$]$ P. Amendt et al., Phys. Rev. Lett. 94, 65004 (2005) \\ $[$4$]$ W. S. Varnum et al., Phys. Rev. Lett. 84, 5153 (2000)