,Influence analysis of symmetry on capsule in six-cylinder-port hohlraum

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We have investigated the flux symmetry on the capsule in a six-cylinder-port hohlraum for improving the design of the hohlraum.The influence factors of drive symmetry on the capsule in the hohlraum are studied,including laser power,laser beams arrangement,hohlraum geometric parameters,plasma condition,capsule convergence,etc.The x-ray radiation flux distribution on the capsule is obtained based on the three-dimensional view factor model.In the six-cylinder-port hohlraum,the main drive asymmetry is the C40 mode asymmetry.When the C40 mode asymmetry approaches zero,the drive symmetry on the capsule is optimal.Our results demonstrate that in order to have a high flux symmetry on the capsule in the laser main-pulse stage,more negative initial C40 modes are needed,which can be realized by adjusting the hohlraum geometry parameters.The hohlraum with column length LH =4.81 mm has an optimal symmetry in the laser main-pulse stage.
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