2018•arXiv (Cornell University)Open access
First Investigation on the Radiation Field of the Gas-Filled Three-Axis Cylindrical Hohlraum
Hang Li, Longfei Jing, Shaoen Jiang, Longyu Kuang, Huabin Du, Xiayu Zhan, Zhichao Li, Sanwei Li, Liling Li, Jianhua Zheng, Jinhua Zheng, Zhiwei Lin, Lu Zhang, Qiangqiang Wang, Yimeng Yang, Bo Ma, Peng Wang, Dong Sheng Yang, Feng Wang, Jiamin Yang, Lin Gao, Haijun Zhang, Juan Zhang, Honglian Wang, Chenggang Ye, Qianqian Gu, Jie Tang, Wei Zhang, Jun Xie, Guanghui Yuan, Zhibing He, Kai Du, Xu Chen, Xiaoxia Huang, Yuancheng Wang, Xuewei Deng, Wei Jia Zhou, Liquan Wang, Caibo Deng, Yongkun Ding, Baohan Zhang
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Abstract
A novel ignition hohlraum named three-axis cylindrical hohlraum (TACH) is designed for indirect-drive inertial confinement fusion. TACH is a kind of 6 laser entrance holes (LEHs) hohlraum, which is orthogonally jointed of three cylindrical hohlraums. The first experiment on the radiation field of TACH was performed on Shenguang III laser facility. 24 laser beams were elected and injected into 6 LEHs quasi-symmetrically. Total laser energy was about 59 kJ, and the peak radiation temperature reached about 192 eV. Radiation temperature and pinhole images in gas-filled hohlraum are largely identical but with minor differences with those in vacuum hohlraum. All laser energy can be totally delivered into hohlraum in 3 ns duration even without filled gas in the hohlraum of 1.4 mm diameter. Plasma filling cannot be obviously suppressed even with 0.5 atm pressure gas in the small hohlraum. Backscattering fractions of vacuum hohlraum and gas-filled hohlraum are both lower than 2%. Experimental study of this new kind of hohlraum can provide guidance for future target design and implosion experiment.
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