Speaker
Ke Lan
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/I1.202.pdf
Progress in spherical hohlraum studies and experimental campaign on
high energy laser facilities in China
Ke Lan 1
1
Institute of Applied Physics and Computational Mathematics, Beijing, China
We have made both theoretical and experimental progresses in spherical hohlraum study
since we began to study the octahedral hohlraum in 2013. In the theoretical studies, we gave
the configuration, the concept and the design of octahedral spherical hohlraum, compared the
robustness of the octahedral spherical hohlraum with that of the cylindrical hohlraum and the
rugby hohlraum, proposed a novel octahedral spherical hohlraum with cylindrical Laser
Entrance Holes (LEH) and LEH shields, and gave a design triangle for determining the
geometrical sizes of octahedral spherical hohlraum for ignition target design. Presently, we
are developing LARED-3D, a 3D radiation hydrodynamic code to simulate the octahedral
hohlraum physics. In experimental study, we have accomplished eight disintegration
experiments in Spherical Hohlraum Campaign (SHC) on the SG laser facilities since 2014,
including (1) improvement of laser transport by using the cylindrical LEH, (2) comparisons
of LPI between the spherical hohlraum and the cylindrical hohlraum, (3) first demonstration
of low LPI in the gas-filled capsule-located spherical hohlraums under high intensity laser, (4)
determination of LEH size for ignition spherical hohlraum, (5) energetics of 2 LEH spherical
hohlraum, (6) energetics of 6 LEH spherical hohlraum, (7) Thomson scattering diagnostic of
plasma status inside the 6LEH spherical hohlraum, (8) determination of laser injection
scheme for 6LEH spherical hohlraum at SGIII laser facility. As a result of our theoretical
study and SPHC, the octahedral spherical hohlraum has advantages in a natural and robust
high symmetry without supplementary technology, a high energy coupling efficiency, and a
low LPI. Finally, we proposed to use 4 - 2 laser as ignition driven for future ignition
facility with a configuration designed for the octahedral hohlraums.
