Abstract
In this paper, we compare experimental shock and capsule trajectories to design calculations using the radiation-hydrodynamics code hydra. The measured trajectories from surrogate ignition targets are consistent with reducing the x-ray flux on the capsule by about 85%. A new method of extracting the radiation temperature from x-ray data shows that about half of the apparent 15% flux deficit in the data with respect to the simulations can be explained by hydra overestimating the x-ray flux on the capsule.
Highlights
The National Ignition Campaign (NIC) point-design target is designed to reach a peak fuel-layer velocity of 370 km/s by ablating 90 % of its plastic (CH) ablator
The measured radial positions of the leading shock wave and the unablated shell are consistent with simulations in which the x-ray flux on the capsule is artificially reduced by 85 %
We describe a new method of inferring the TRAD seen by the capsule from time-dependent x-ray intensity data and static x-ray images
Summary
The National Ignition Campaign (NIC) point-design target is designed to reach a peak fuel-layer velocity of 370 km/s by ablating 90 % of its plastic (CH) ablator. The 192-beam National Ignition Facility laser [1] drives a gold hohlraum [Fig. 1 (a)] to a radiation temperature (TRAD) of 300 eV with a 20 nslong, 420 TW, 1.3 MJ laser pulse. We compare experimental measurements of the hohlraum TRAD and the implosion trajectory with design calculations using the code hydra [2]. We describe a new method of inferring the TRAD seen by the capsule from time-dependent x-ray intensity data and static x-ray images. This analysis shows that hydra overestimates the x-ray flux incident on the capsule by ≈ 8 %
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
