Target density effects on charge tansfer of laser-accelerated carbon ions in dense plasma
查看更多>>作者：Ren Jieru；Ma Bubo；Liu Lirong；Wei Wenqing；Chen Benzheng；Zhang Shizheng；Xu Hao；Hu Zhongmin；Li Fangfang；Wang Xing；Yin Shuai；Feng Jianhua；Zhou Xianming；Gao Yifang；Li Yuan；Shi Xiaohua；Li Jianxing；Ren Xueguang；Xu Zhongfeng；Deng Zhigang；Qi Wei；Wang Shaoyi；Fan Quanping；Cui Bo；Wang Weiwu；Yuan Zongqiang；Teng Jian；Wu Yuchi；Cao Zhurong；Zhao Zongqing；Gu Yuqiu；Cao Leifeng；Zhu Shaoping；Cheng Rui；Lei Yu；Wang Zhao；Zhou Zexian；Xiao Guoqing；Zhao Hongwei；Hoffmann Dieter H. H.；Zhou Weimin；Zhao Yongtao
- 创建日期：2024-04-11
- 发布日期：2024-04-11
- 最新更新日期：2022-10-01
简介：
查看更多>>We report on charge state measurements of laser-accelerated carbon ions in the energy range of several MeV penetrating a dense partially ionized plasma. The plasma was generated by irradiation of a foam target with laser-induced hohlraum radiation in the soft X-ray regime. We used the tri-cellulose acetate (C$_{9}$H$_{16}$O$_{8}$) foam of 2 mg/cm$^{-3}$ density, and $1$-mm interaction length as target material. This kind of plasma is advantageous for high-precision measurements, due to good uniformity and long lifetime compared to the ion pulse length and the interaction duration. The plasma parameters were diagnosed to be T$_{e}$=17 eV and n$_{e}$=4 $\times$ 10$^{20}$ cm$^{-3}$. The average charge states passing through the plasma were observed to be higher than those predicted by the commonly-used semiempirical formula. Through solving the rate equations, we attribute the enhancement to the target density effects which will increase the ionization rates on one hand and reduce the electron capture rates on the other hand. In previsous measurement with partially ionized plasma from gas discharge and z-pinch to laser direct irradiation, no target density effects were ever demonstrated. For the first time, we were able to experimentally prove that target density effects start to play a significant role in plasma near the critical density of Nd-Glass laser radiation. The finding is important for heavy ion beam driven high energy density physics and fast ignitions.
DOI10.48550/arxiv.2208.00958
