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

doi:10.1088/1674-1056/ade385

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.

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

Received: 09 April 2025
Revised: 31 May 2025
Accepted manuscript online: 11 June 2025

PACS:	52.30.-q	(Plasma dynamics and flow)
	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)

Fund: Project supported by the National Key Laboratory of Particle Transport and Separation Technology (Grant No. WZKF- 2024-2).

Corresponding Authors: He-Ping Li
E-mail: liheping@tsinghua.edu.cn

Cite this article:

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 2025 Chin. Phys. B 34 115201

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

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