Assessing the impact of pre-ionization technique on the homogeneity and stability of the current sheath layer in dense plasma focus device

IF 2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-09-10 DOI:10.1016/j.fusengdes.2025.115429

A. Hosseinzadeh , N. Vosoughi , T.D. Mahabadi , D. Piriaei

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Abstract

In this research, the pre-ionization technique was applied using an optimal shunt resistor on a Dense Plasma Focus (DPF) device filled with deuterium as the working gas. The effects of this technique on the properties of the current sheath layer, particularly its homogeneity and stability, which are crucial factors in the quality of nuclear fusion, have been investigated. Time-frequency wavelet analysis of pulses obtained from Mirnov coils in two different configurations (toroidal and poloidal arrangements) indicated the effect of this technique on improving the homogeneity of the magnetic field intensity produced by the current sheath layer. Time-Integrated Analysis (TIA) and Frequency-Integrated Analysis (FIA) of the Mirnov circuit pulses, along with the evaluation of the magnetic field intensity ratios of these coils placed at specific azimuthal angles (particularly 0 and 180 degrees) and different orientations (particularly radial and axial), demonstrated the positive effect of the current sheath's homogeneity on the quantitative convergence of these ratios. This convergence indicates the beneficial effect of the pre-ionization technique in reducing the stresses, asymmetries, and instabilities of the current sheath layer, which subsequently leads to an improvement in the efficiency of the nuclear fusion reaction in the DPF system.

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预电离技术对致密等离子体聚焦装置中电流鞘层均匀性和稳定性的影响

在本研究中，将预电离技术应用于充满氘作为工作气体的稠密等离子体聚焦（DPF）装置上。研究了该技术对电流鞘层性能的影响，特别是其均匀性和稳定性，这是影响核聚变质量的关键因素。对两种不同结构（环向和极向排列）下的Mirnov线圈脉冲进行时频小波分析，结果表明该技术可以改善电流鞘层产生的磁场强度的均匀性。Mirnov电路脉冲的时间积分分析（TIA）和频率积分分析（FIA），以及这些线圈在特定方位角（特别是0度和180度）和不同方向（特别是径向和轴向）下的磁场强度比的评估，证明了电流护套的均匀性对这些比率的定量收敛的积极影响。这种收敛表明了预电离技术在减少电流鞘层的应力、不对称性和不稳定性方面的有益作用，从而导致DPF系统中核聚变反应效率的提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.