Sensitivity study of ignition capsule implosion performance on the hard x-ray spectral distribution of hohlraum

Journal Article · Sat Dec 15 04:00:00 EST 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4773209· OSTI ID:22072648

Jianfa, Gu; Shiyang, Zou; Yongsheng, Li; Zhensheng, Dai; Wenhua, Ye ^[1]

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1. Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)

The paper investigates theoretically the sensitivities of ignition capsule implosion performance on the hard x-ray spectral distribution of hohlraum. In the simulation, the hohlraum radiation is represented by a Planckian spectrum for the main drive plus a gaussian bump centered at energy E{sub c} for preheating x-rays. Simulation results show that with the increasing of center energy E{sub c}, the Atwood number at the fuel-ablator interface increases rapidly due to the preheating and expanding of the inner undoped CH layer. The growing of Atwood number indicates the hydrodynamic instability (HI) growth and mixing at this interface. On the other hand, the increasing of E{sub c} results in a large density gradient scale length of ablation front and stabilizes the HI growth at ablation front. The changes of the hard x-ray spectrum have significant influences on other important implosion parameters including the ablator mass remaining, shock timing, implosion velocity, and yield as well. High-precision results on the hard x-ray spectral distribution of hohlraum are thus critical for optimizing the ignition capsule design to limit the HI growth.

• OSTI ID: 22072648
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 19; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABLATION
ACCURACY
CAPSULES
CAVITY RECEIVERS
DESIGN
HARD X RADIATION
HEAT TREATMENTS
HYDRODYNAMICS
IMPLOSIONS
PLASMA INSTABILITY
SENSITIVITY ANALYSIS
THERMONUCLEAR FUELS
X-RAY SPECTRA