Z-Pinch Dynamic Axial Magnetization Model of Coupled Rotating Reflux Column and Its Structural Optimization Method

JIANG Zhiyuan; LU Yuanbo; WANG Wei; WANG Zhenyu; ZHAO Yiming; WU Jian

doi:10.7652/xjtuxb202505019

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Z-Pinch Dynamic Axial Magnetization Model of Coupled Rotating Reflux Column and Its Structural Optimization Method

更新时间：2025-08-26

- Z-Pinch Dynamic Axial Magnetization Model of Coupled Rotating Reflux Column and Its Structural Optimization Method
- Journal of Xi’an Jiaotong University Vol. 59, Issue 5, Pages: 198-208(2025)
- 作者机构：
  
  西安交通大学电工材料电气绝缘全国重点实验室， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202505019
  CLC： TM836
- Received：27 November 2024，
  
  Online First：10 February 2025，
  
  Published：10 May 2025
- 稿件说明：
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JIANG Zhiyuan, LU Yuanbo, WANG Wei, et al. Z-Pinch Dynamic Axial Magnetization Model of Coupled Rotating Reflux Column and Its Structural Optimization Method[J]. Journal of Xi’an Jiaotong University, 2025, 59(5): 198-208.
DOI：

JIANG Zhiyuan, LU Yuanbo, WANG Wei, et al. Z-Pinch Dynamic Axial Magnetization Model of Coupled Rotating Reflux Column and Its Structural Optimization Method[J]. Journal of Xi’an Jiaotong University, 2025, 59(5): 198-208. DOI： 10.7652/xjtuxb202505019.

摘要

为了对Z箍缩等离子体轴向磁场调控致稳结构进行设计和改进，以基于旋转回流柱的Z箍缩动态磁化系统为研究对象，探究了轴向磁场的三维分布及其与等离子体的耦合过程。首先，构建了描述兆安级脉冲源耦合旋转回流柱放电过程的多物理场演化模型，系统研究回流柱结构参数对初始轴向磁场分布及负载电感值的影响；随后，建立了考虑轴向磁场的雪耙模型，探讨轴向磁场对等离子体内爆过程及不稳定性发展的调控规律；最后，针对旋转回流柱产生轴向磁场的不均匀性，提出通过耦合由螺旋臂构成的磁镜结构和旋转回流柱结构，从而提升轴向磁场幅值和轴向均匀度的优化方法。结果表明：在负载高度固定的情况下，旋转回流柱相较于直回流柱增加的额外电感值主要由回流柱匝数决定；轴向磁场幅值随旋转回流柱匝数的增加而增强，但电流上升时间也相应延长；当回流柱匝数从0.75增加至1.25时，同一时刻的内爆半径最大可增加约25%，滞止时间延迟约13%，且轴向磁场调控下不稳定性幅值最大可降低40%；在旋转回流柱耦合磁镜后，能够将轴向磁场的轴向不均匀度从67%降低至11%，并将内爆过程的轴向不均匀度从最大42%降低至9%。

Abstract

In order to design and improve the axial magnetic field control structure for stabilizing Z-pinch plasmas

the Z-pinch dynamic magnetization system based on the rotating reflux column is taken as the research object

and three-dimensional distribution of the axial magnetic field and its coupling process with the plasma are explored. First

a multiphysics evolution model is constructed to describe the discharge process of mega-ampere-level pulse source coupled rotating reflux column

and the impact of structural parameters of the reflux column on the initial axial magnetic field distribution and the load inductance value is systematically investigated. Then

a snowplow model considering the axial magnetic field is established to explore the regulation of the axial magnetic field on the plasma implosion process and instability development. Finally

to address the inhomogeneity of the axial magnetic field generated by the rotating reflux column

a method is proposed to enhance the axial magnetic field amplitude and uniformity by coupling a magnetic mirror structure composed of helical arms with the rotating reflux column. The results indicate that

with a fixed load height

the additional inductance value added by the rotating reflux column compared with the straight reflux column is primarily determined by the number of turns of the reflux column. The axial magnetic field amplitude increases with the number of turns of the rotating reflux column

but the current rise time also increases accordingly. When the number of turns increases from 0.75 to 1.25

the implosion radius can increase by up to 25% at the same moment

the stagnation time is delayed by approximately 13%

and the instability amplitude can be reduced by up to 40% under axial magnetic field control. After the rotating reflux column is coupled with the magnetic mirror

the axial magnetic field inhomogeneity is reduced from 67% to 11%

and the axial inhomogeneity of the implosion process is reduced from a maximum of 42% to 9%.

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references

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