One-dimensional theoretical analysis on charged-particle transports in a decaying plasma with an initial plasma–electrode gap

doi:10.1088/1674-1056/ade385

中国物理B ›› 2025, Vol. 34 ›› Issue (11): 115201-115201.doi: 10.1088/1674-1056/ade385

One-dimensional theoretical analysis on charged-particle transports in a decaying plasma with an initial plasma–electrode gap

Xin-Li Sun(孙鑫礼), Yao-Ting Wang(汪耀庭), Lan-Yue Luo(罗岚月), Zi-Ming Zhang(张子明), Meng-Long Zhang(张梦龙), He-Ping Li(李和平)†, Dong-Jun Jiang(姜东君), and Ming-Sheng Zhou(周明胜)

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

收稿日期:2025-04-09 修回日期:2025-05-31 接受日期:2025-06-11 发布日期:2025-10-30
基金资助:
Project supported by the National Key Laboratory of Particle Transport and Separation Technology (Grant No. WZKF- 2024-2).

One-dimensional theoretical analysis on charged-particle transports in a decaying plasma with an initial plasma–electrode gap

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Received:2025-04-09 Revised:2025-05-31 Accepted:2025-06-11 Published:2025-10-30
Contact: He-Ping Li E-mail:liheping@tsinghua.edu.cn
Supported by:
Project supported by the National Key Laboratory of Particle Transport and Separation Technology (Grant No. WZKF- 2024-2).

摘要/Abstract

摘要： An analytical model for describing the charged-particle transport in a wall-confined laser-induced decaying plasma is established under an external electrostatic field, focusing on the effects of the initial plasma–electrode gap (IPEG) that exists in applications such as laser isotope separation. This newly developed analytical model is validated by particle-in-cell simulations and the experimental scaling relation, and can also be reduced to its previously published counterpart that did not consider IPEGs. Based on this analytical model, the influences of different IPEG spacings on the characteristics of the whole ion extraction process are studied. The results show that the ion extraction ratios at the endpoints of the first and second stages both decrease with increasing IPEG spacing, while the corresponding time durations for the first two stages show a non-monotonous variation trend. The specific ion extraction time, defined as the ion extraction time per unit mass to comprehensively characterize the ion extraction efficiency, increases generally with the increase of IPEG spacing. This study not only provides further insight into the fundamental physical processes in a wall-bounded decaying plasma under an externally applied electrostatic field, but also offers useful theoretical guidance for optimal designs of geometrical and operating parameters in laser isotope separation processes.

关键词: decaying plasma, charged-particle transport, effect of plasma–electrode gap, theoretical analysis, PIC simulation

Abstract: An analytical model for describing the charged-particle transport in a wall-confined laser-induced decaying plasma is established under an external electrostatic field, focusing on the effects of the initial plasma–electrode gap (IPEG) that exists in applications such as laser isotope separation. This newly developed analytical model is validated by particle-in-cell simulations and the experimental scaling relation, and can also be reduced to its previously published counterpart that did not consider IPEGs. Based on this analytical model, the influences of different IPEG spacings on the characteristics of the whole ion extraction process are studied. The results show that the ion extraction ratios at the endpoints of the first and second stages both decrease with increasing IPEG spacing, while the corresponding time durations for the first two stages show a non-monotonous variation trend. The specific ion extraction time, defined as the ion extraction time per unit mass to comprehensively characterize the ion extraction efficiency, increases generally with the increase of IPEG spacing. This study not only provides further insight into the fundamental physical processes in a wall-bounded decaying plasma under an externally applied electrostatic field, but also offers useful theoretical guidance for optimal designs of geometrical and operating parameters in laser isotope separation processes.

Key words: decaying plasma, charged-particle transport, effect of plasma–electrode gap, theoretical analysis, PIC simulation

中图分类号: (Plasma dynamics and flow)

52.30.-q

52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves)) 52.50.Qt (Plasma heating by radio-frequency fields; ICR, ICP, helicons) 28.60.+s (Isotope separation and enrichment)

Xin-Li Sun(孙鑫礼), Yao-Ting Wang(汪耀庭), Lan-Yue Luo(罗岚月), Zi-Ming Zhang(张子明), Meng-Long Zhang(张梦龙), He-Ping Li(李和平), Dong-Jun Jiang(姜东君), and Ming-Sheng Zhou(周明胜). One-dimensional theoretical analysis on charged-particle transports in a decaying plasma with an initial plasma–electrode gap[J]. 中国物理B, 2025, 34(11): 115201-115201.

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One-dimensional theoretical analysis on charged-particle transports in a decaying plasma with an initial plasma–electrode gap

One-dimensional theoretical analysis on charged-particle transports in a decaying plasma with an initial plasma–electrode gap

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