Investigation on the scaling of magneto-Rayleigh–Taylor instability to the current rise time of Z-pinch plasmas

Nuclear Fushion

article

Wang Xiaoguang¹  Ren Xiaodong³  Meng Shijian⁴  Mao Chongyang¹  Xiao Delong¹  Yi Qiang⁴  Zhou Shaotong³  Huang Xianbin³  Zhou Xiuwen⁵  Weng Wenqian⁵  Huang Zhanchang⁴  Xue Chuang¹  Wang Guanqiong¹  Sun Shunkai¹  Shu Xiaojian¹ 

[1] Institute of Applied Physics and Computational Mathematics;Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics;Institute of Fluid Physics, China Academy of Engineering Physics;Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;Laser Fusion Research Center, China Academy of Engineering Physics

关键词: magneto-Rayleigh–Taylor;    current rise time;    wirearray;    Z-pinches;   

DOI  :  10.1088/1741-4326/acedc5

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

Understanding how the magneto-Rayleigh–Taylor instability (MRTI) scales to the current rise time is vital for Z-pinch dynamic hohlraum driven inertial confinement fusion. Wanget aldiscovered in prior theoretical work that the perturbation amplitude of MRTI before stagnation increases linearly with the current rise time when the implosion velocity of Z-pinch plasma is held constant. In the present work, three types of wire-array experiments with similar implosion dynamics and constant implosion velocity are performed on an 8 MA pulse power generator to investigate the scaling of MRTI to the rise time. It is successfully accomplished for the first time to obtain the similar wire-array Z-pinch implosions in which the current rise time is scaled up to three times on the generator by controlling the trigger time of its 24 modules. Both the experimental results, which include x-ray radiation pulses and x-ray images of imploding plasmas, and the related numerical analysis have shown that the MRTI before stagnation grows linearly with the rise time, as predicted by the theoretical model.

【 授权许可】

Unknown