A credible model describing radiation-driven implosion in cylindrical hohlraums

• Published in: Physics of plasmas 2006-02, Vol.13 (2)
• Main Authors: Chang, Tieqiang, Sheng, Jiatian, Miao, Wenyong, Li, Yunsheng, Jiang, Shaoen, Pei, Wenbing, Chen, Jiabin, Gao, Yaoming, Yang, Jiamin, Feng, Tinggui, Zheng, Zhijian, Zhang, Lifa, Ding, Yongkun, Li, Jinghong, Li, Meng
• Format: Article
• Language: English
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; CAPSULES; COMPUTERIZED SIMULATION; CYLINDRICAL CONFIGURATION; ELECTRON TEMPERATURE; IMPLOSIONS; ION TEMPERATURE; LASERS; LIGHT TRANSMISSION; NEUTRONS; NUCLEAR REACTION YIELD; ONE-DIMENSIONAL CALCULATIONS; PHOTON EMISSION; PLASMA; PLASMA INSTABILITY; PLASMA SIMULATION; RADIATION FLUX; X-RAY SOURCES; X-RAY SPECTRA
• ISSN: 1070-664X; 1089-7674
• DOI: 10.1063/1.2172181

A one-dimensional model describing the radiation-driven implosion in cylindrical hohlraums is proposed in this article. For the model, the radiation flux boundary condition is composed of both the equilibrium and the nonequilibrium parts by means of the experimentally measured radiation temperature and the nonequilibrium x-ray spectra emitted from laser spots. The correctness of the model is guaranteed by a criterion, the capsule-absorbed radiation energy inferred from the hohlraum radiation theory, which is independent of any implosion simulation [Chang et al. , Phys. Plasmas 11, 4286 (2004)]. In this article the model is applied to the implosion experiments performed at the Shenguang II laser facility [Zunqi et al. , Chin. J. Lasers, B10, 6 (2001)], and the neutron yields are consistent with the experimental data if the hydrodynamic instability is appropriately considered.