Effect of Surface Produced H̄ Ion on the Plasma Meniscus in Negative Hydrogen Ion Sources

Katsuya Hayashi; Kazuo Hoshino; Akiyoshi Hatayama; Kenji Miyamoto; Jacques Lettry

doi:10.1585/PFR.18.1401008

Effect of Surface Produced H̄ Ion on the Plasma Meniscus in Negative Hydrogen Ion Sources

Katsuya Hayashi, Kazuo Hoshino, Akiyoshi Hatayama, Kenji Miyamoto, Jacques Lettry

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Article › peer-review

Abstract

To extract intense ion beams with good beam optics from ion sources, controlling the distance d_eff between the plasma meniscus (i.e., beam emission surface) and the beam extraction grid is important. This study conducts a novel investigation into the dependence of the effective distance d_eff on the amount of surface H̄ production S_H-. For this purpose, a 3D PIC (three dimensional Particle-in-Cell) simulation is conducted to obtain a model geometry of the extraction region for a H̄ ion source with S_H- as a parameter. Based on results, d_eff significantly depends on S_H- and the H̄-electron density ratio (α = n_H̄=n_e) in front of the extraction aperture for the same plasma density; as S_H- increases, d_eff decreases.

Original language	English
Article number	1401008
Journal	Plasma and Fusion Research
Volume	18
DOIs	https://doi.org/10.1585/PFR.18.1401008
Publication status	Published - 2023

Keywords

negative ion source
particle-in-cell
plasma meniscus
surface-produced ion

ASJC Scopus subject areas

Condensed Matter Physics

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10.1585/PFR.18.1401008

Cite this

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title = "Effect of Surface Produced {\=H} Ion on the Plasma Meniscus in Negative Hydrogen Ion Sources",

abstract = "To extract intense ion beams with good beam optics from ion sources, controlling the distance deff between the plasma meniscus (i.e., beam emission surface) and the beam extraction grid is important. This study conducts a novel investigation into the dependence of the effective distance deff on the amount of surface {\=H} production SH-. For this purpose, a 3D PIC (three dimensional Particle-in-Cell) simulation is conducted to obtain a model geometry of the extraction region for a {\=H} ion source with SH- as a parameter. Based on results, deff significantly depends on SH- and the {\=H}-electron density ratio (α = n{\=H}=ne) in front of the extraction aperture for the same plasma density; as SH- increases, deff decreases.",

keywords = "negative ion source, particle-in-cell, plasma meniscus, surface-produced ion",

author = "Katsuya Hayashi and Kazuo Hoshino and Akiyoshi Hatayama and Kenji Miyamoto and Jacques Lettry",

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year = "2023",

doi = "10.1585/PFR.18.1401008",

language = "English",

volume = "18",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

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TY - JOUR

T1 - Effect of Surface Produced H̄ Ion on the Plasma Meniscus in Negative Hydrogen Ion Sources

AU - Hayashi, Katsuya

AU - Hoshino, Kazuo

AU - Hatayama, Akiyoshi

AU - Miyamoto, Kenji

AU - Lettry, Jacques

PY - 2023

Y1 - 2023

N2 - To extract intense ion beams with good beam optics from ion sources, controlling the distance deff between the plasma meniscus (i.e., beam emission surface) and the beam extraction grid is important. This study conducts a novel investigation into the dependence of the effective distance deff on the amount of surface H̄ production SH-. For this purpose, a 3D PIC (three dimensional Particle-in-Cell) simulation is conducted to obtain a model geometry of the extraction region for a H̄ ion source with SH- as a parameter. Based on results, deff significantly depends on SH- and the H̄-electron density ratio (α = nH̄=ne) in front of the extraction aperture for the same plasma density; as SH- increases, deff decreases.

AB - To extract intense ion beams with good beam optics from ion sources, controlling the distance deff between the plasma meniscus (i.e., beam emission surface) and the beam extraction grid is important. This study conducts a novel investigation into the dependence of the effective distance deff on the amount of surface H̄ production SH-. For this purpose, a 3D PIC (three dimensional Particle-in-Cell) simulation is conducted to obtain a model geometry of the extraction region for a H̄ ion source with SH- as a parameter. Based on results, deff significantly depends on SH- and the H̄-electron density ratio (α = nH̄=ne) in front of the extraction aperture for the same plasma density; as SH- increases, deff decreases.

KW - negative ion source

KW - particle-in-cell

KW - plasma meniscus

KW - surface-produced ion

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Effect of Surface Produced H̄ Ion on the Plasma Meniscus in Negative Hydrogen Ion Sources

Abstract

Keywords

ASJC Scopus subject areas

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