Effect of a dynamic axial magnetic field on a preconditioned single-wire Z-pinch

Nuclear Fushion

article

Zhiyuan Jiang¹  Jian Wu¹  Wei Wang¹  Ziwei Chen¹  Xinmiao Zhou¹  Zhenyu Wang¹  Yuanbo Lu¹  Yiming Zhao¹  Huantong Shi¹  Xingwen Li¹ 

[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No. 28 XianNing West Road, Xi’an, Shaanxi Province 710049

关键词: Z-pinch;    dynamic axial magnetic field;    prepulse current;    optical diagnosis;   

DOI  :  10.1088/1741-4326/acf386

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

In this study, the effect and mechanism of a dynamic axial magnetic field on a preconditioned single-wire Z-pinch were investigated experimentally and theoretically. Optical diagnostic methods, including shadowgraphy, interferometry, Faraday rotation, and Thomson scattering, have been used to measure the parameters of magnetized plasmas. Compression of the azimuthal and axial magnetic fields was observed, and the suppression of the plasma instability was recorded and analyzed. The results showed that an external axial magnetic field could reduce the plasma instability and non-uniformity, but prolong the implosion time and weaken the compression ratio. In the implosion process with an axial magnetic field, the plasma rotated at a speed similar to that of imploding, which could be regarded as a stabilization method. A simplified model of the diffusion and compression processes of a dynamic axial magnetic field was developed to investigate the conditions for maximizing the amplitude of the axial magnetic field. Subsequently, the snowplow model was used to calculate the effect of axial magnetic fields on the implosion process and energy conversion.

【 授权许可】

Unknown