Ion Transport from Laser Induced Metal Plasma to Ion Extraction Electrodes

Nishio, Ryoji; Yamada, K.; Suzuki, Kazumichi; Wakabayashi, Manabu

doi:10.1080/18811248.1995.9731694

Cited by 26 publications

(8 citation statements)

References 11 publications

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“…[8,[19][20][21][22][23], under which the sheath front advances into the plasma much faster than the speed of the ion acoustic rarefaction wave, as illustrated by Line A in figure 2. The key points of the preceding ion extraction methods include the modification of the electric potential distributions so as to achieve the ion collection by the two parallel electrodes simultaneously with an addition of the third electrode [19,22,23], or the modification of the sheath structure in the vicinity of the extraction plates during plasma decaying so that the externally applied electric field can penetrate the plasmas [24,25]. Under such conditions, the ion flux to the extraction plate (Γ i ) can be increased significantly; consequently, a much shorter ion extraction time (t exc ) can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Chen

Guo

2019

Plasma Sci. Technol.

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In this paper, a one-dimension particle-in-cell (PIC) code (EDIPIC) is employed to simulate the parallel-plate ion extraction process under an externally applied electrostatic field, focusing on the analysis of the influence of the initial electron temperature on the extracted ion fluxes to the metal plates during the ion extraction process. Compared with previously published results, the plasma oscillations on a timescale of the electron plasma period, and the excitation of the ion acoustic rarefaction waves resulting from the plasma oscillations originating from both the negative and positive electrodes, are studied for the first time. The modeling results show that both the negative and positive extractors can collect ions due to the plasma oscillations and the propagation of the ion acoustic rarefaction waves. With the increase of the initial electron temperature achieved by keeping other parameters unchanged, on the one hand, both the ion speed and flux to the negative and positive plates increase, which leads to a significant decrease of the ion extraction time, while on the other hand, the ion flux to the positive plate after the formation of a Child-Langmuir sheath is much more sensitive to an increase of the initial electron temperature than that to the negative plate. The PIC simulation results provide a deeper physical understanding of the influence of the initial electron temperature on the characteristics of the entire ion extraction process in a decaying plasma.

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Section: Introductionmentioning

confidence: 99%

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Chen

Guo

2019

Plasma Sci. Technol.

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“…In the past, various electrode configurations have been explored using theoretical, analytical, and experimental models to optimize the ion-extraction system. These configurations include parallel plate [4,5,6], non-parallel plate [7], wire-type [8,9], M-type [10,11], Π-type [10,12,13], plategrid-plate (PGP) [14], and plate-grid-grid-plate (PGGP) [15,16] electrode configurations. Among the various electrode configurations, the M-type configuration demonstrates the shortest ion extraction time [10,17].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Ion extraction processes in M-Type electrode configuration and the influence of top electrode

Singh,

Maiti

2024

Phys. Scr.

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In the realm of ion-extraction from photoplasma, the design of electrode configuration exerts significant influence over extraction efficiency by tailoring the vacuum gap and electric potential distribution. Over time, various electrode configurations have been explored, including parallel-plate, wire-type, M-type, and Π-type designs. Notably, the M-type configuration has shorter ion-extractiontimes. In the present study, a comprehensive investigation of the ion extraction process with the M-Type setup is performed using a 2D2v-electrostatic Particlein-Cell simulation. The study focuses on the spatiotemporal evolution of photoplasma, the formation of the plasma sheath, and spatial distribution of electric potential.Subsequently, a series of computational experiments have been conducted by systematically altering the size of top electrode in the M-type configuration, effectively transforming it into wire-type and Π-type. The objective of these experiments is to explore the impact of the top electrode on ion-extraction. The obtained simulation results reports a significant finding: the formation of a virtual anode between the cathodes. This distinct phenomenon substantially contributes to an exceptional level of efficiency, exceeding 90%, among different simulated configurations. Furthermore, it also reports an approximate 95% collection efficiency with minimum collection time with an M-type configuration over the Π-type electrode configuration.

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“…Two parameters, i.e., the ion extraction flux (Γ i ), and ion extraction time (t ext ) defined as the time required from the start of the ion extraction process to the time point when 90% of ions are extracted, are used to describe the features of the ion extraction process in previous studies. [12] Up to now, many ef-forts have been made to improve Γ i , such as improvements of extracting electrode configurations (e.g., Π type [10,13,15,16] and M type [15,[17][18][19] ) and weakening of the shielding effect of high voltage sheath (e.g., RF resonance method [11,[20][21][22][23][24] ), etc. Analytical description, [7,9,[25][26][27] fluid simulation, [28,29] and particle-in-cell (PIC) simulation [15,16,30,31] are the three major theoretical methods for studying the ion extraction process.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analyses on the one-dimensional charged particle transport in a decaying plasma under an electrostatic field

et al. 2023

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In this paper, the spatiotemporal evolutions of a one-dimensional collisionless decaying plasma bounded by two electrodes with an externally applied electrostatic field are studied by theoretical analyses and particle-in-cell (PIC) simulations with the ion extraction process in a laser-induced plasma as the major research background. Based on the theoretical analyses, the transport process of the charged particles including electrons and ions can be divided into three stages: electron oscillation and ion matrix sheath extraction stage, sheath expansion and ion rarefaction wave propagation stage and the plasma collapse stage, and the corresponding criterion for each stage is also presented. Consequently, a complete analytical model is established for describing the ion extraction flux at each stage during the decaying of the laser-induced plasmas under an electrostatic field, which is also validated by the PIC modeling results. Based on this analytical model, influences of the key physical parameters, including the initial electron temperature and number density, plasma width and the externally applied electric voltage, on the ratio of the extracted ions are predicted. The calculated results show that a higher applied electric potential, smaller initial plasma number density and plasma width lead to a higher ratio of the extracted ions during the first stage; while in this stage, the initial electron temperature shows little effect on it. Meanwhile, more ions will be extracted before the plasma collapse once a higher electric potential is applied. The theoretical model presented in this paper is helpful not only for a deep understanding to the charged particle transport mechanisms for a bounded decaying plasma under an applied electrostatic field, but also for an optimization of the ion extraction process in practical applications.

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Ion Transport from Laser Induced Metal Plasma to Ion Extraction Electrodes

Cited by 26 publications

References 11 publications

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Investigation on Ion extraction processes in M-Type electrode configuration and the influence of top electrode

Theoretical analyses on the one-dimensional charged particle transport in a decaying plasma under an electrostatic field

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