Abstract
A novel ignition hohlraum for indirect-drive inertial confinement fusion is proposed, which is named three-axis cylindrical hohlraum (TACH). TACH is a kind of 6 laser entrance holes (LEHs) hohlraum, which is orthogonally jointed of three cylindrical hohlraums. Laser beams are injected through every entrance hole with the same incident angle of 55°. A view-factor simulation result shows that the time-varying drive asymmetry of TACH is less than 1.0% in the whole drive pulse period without any supplementary technology. Coupling efficiency of TACH is close to that of 6 LEHs spherical hohlraum with corresponding size. Its plasma-filling time is close to that of typical cylindrical ignition hohlraum. Its laser plasma interaction has as low backscattering as the outer cone of the cylindrical ignition hohlraum. Therefore, TACH combines most advantages of various hohlraums and has little predictable risk, providing an important competitive candidate for ignition hohlraum.
Highlights
TACH is a kind of 6 laser entrance holes (LEHs) hohlraum. 8 laser quads arranged in one cone are injected through each LEH
TACH is a kind of 6 LEHs hohlraum. 8 laser quads arranged in one cone are injected through each LEH
For TACHs with case-to-capsule ratio (CCR) between 2.0 and 2.2, εis between 0.96 and 1.1, so the filling time of TACH is close to cylindrical hohlraum. From another point of view, TACH is composed of six half cylindrical hohlraums (HCHs)
Summary
TACH is a kind of 6 LEHs hohlraum. 8 laser quads arranged in one cone are injected through each LEH. The time-varying symmetry, coupling efficiency and plasma filling of TACH are studied in this article. AW, AS, AC, and AL are used to denote the areas of the hohlraum wall, laser spots, capsule surface and LEH respectively.
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