Numerical analysis of electron energy distribution function and its effects on the H- production in Linac4 H- source

Shintaro Mochizuki; Stefano Mattei; Kenjiro Nishida; Akiyoshi Hatayama; Jacques Lettry

doi:10.1585/pfr.11.2406044

Numerical analysis of electron energy distribution function and its effects on the H^- production in Linac4 H^- source

Shintaro Mochizuki, Stefano Mattei, Kenjiro Nishida, Akiyoshi Hatayama, Jacques Lettry

Department of Applied Physics and Physico-Informatics

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

Abstract

In order to enhance the H^- surface production in hydrogen negative ion sources, it is important to increase the density of the H atoms dissociated from H₂ molecule and the resultant atomic flux towards the surface of the plasma grid. In this paper, the effect of the Electron Energy Distribution Function (EEDF) on the dissociation of H₂ in Linac4 H^- source has been studied using Electromagnetic Particle In Cell (EM-PIC) simulation with Monte Carlo method for Collision Processes (MCC). It has been shown that the rate coefficient of dissociation reactions can be enhanced in the lower H₂ gas pressure regime, while the H atom production rate becomes larger in the higher pressure regime. It is suggested that the optimal H₂ gas pressure to maximize the H atom production is determined by the balance of rate coefficient and the H₂ density.

Original language	English
Article number	2406044
Journal	Plasma and Fusion Research
Volume	11
Issue number	1
DOIs	https://doi.org/10.1585/pfr.11.2406044
Publication status	Published - 2016

Keywords

Dissociation rate
Electron energy distribution function
Negative ion source
Particle in cell
Rf plasma

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1585/pfr.11.2406044

Cite this

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title = "Numerical analysis of electron energy distribution function and its effects on the H- production in Linac4 H- source",

abstract = "In order to enhance the H- surface production in hydrogen negative ion sources, it is important to increase the density of the H atoms dissociated from H2 molecule and the resultant atomic flux towards the surface of the plasma grid. In this paper, the effect of the Electron Energy Distribution Function (EEDF) on the dissociation of H2 in Linac4 H- source has been studied using Electromagnetic Particle In Cell (EM-PIC) simulation with Monte Carlo method for Collision Processes (MCC). It has been shown that the rate coefficient of dissociation reactions can be enhanced in the lower H2 gas pressure regime, while the H atom production rate becomes larger in the higher pressure regime. It is suggested that the optimal H2 gas pressure to maximize the H atom production is determined by the balance of rate coefficient and the H2 density.",

keywords = "Dissociation rate, Electron energy distribution function, Negative ion source, Particle in cell, Rf plasma",

author = "Shintaro Mochizuki and Stefano Mattei and Kenjiro Nishida and Akiyoshi Hatayama and Jacques Lettry",

year = "2016",

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language = "English",

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journal = "Plasma and Fusion Research",

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T1 - Numerical analysis of electron energy distribution function and its effects on the H- production in Linac4 H- source

AU - Mochizuki, Shintaro

AU - Mattei, Stefano

AU - Nishida, Kenjiro

AU - Hatayama, Akiyoshi

AU - Lettry, Jacques

PY - 2016

Y1 - 2016

N2 - In order to enhance the H- surface production in hydrogen negative ion sources, it is important to increase the density of the H atoms dissociated from H2 molecule and the resultant atomic flux towards the surface of the plasma grid. In this paper, the effect of the Electron Energy Distribution Function (EEDF) on the dissociation of H2 in Linac4 H- source has been studied using Electromagnetic Particle In Cell (EM-PIC) simulation with Monte Carlo method for Collision Processes (MCC). It has been shown that the rate coefficient of dissociation reactions can be enhanced in the lower H2 gas pressure regime, while the H atom production rate becomes larger in the higher pressure regime. It is suggested that the optimal H2 gas pressure to maximize the H atom production is determined by the balance of rate coefficient and the H2 density.

AB - In order to enhance the H- surface production in hydrogen negative ion sources, it is important to increase the density of the H atoms dissociated from H2 molecule and the resultant atomic flux towards the surface of the plasma grid. In this paper, the effect of the Electron Energy Distribution Function (EEDF) on the dissociation of H2 in Linac4 H- source has been studied using Electromagnetic Particle In Cell (EM-PIC) simulation with Monte Carlo method for Collision Processes (MCC). It has been shown that the rate coefficient of dissociation reactions can be enhanced in the lower H2 gas pressure regime, while the H atom production rate becomes larger in the higher pressure regime. It is suggested that the optimal H2 gas pressure to maximize the H atom production is determined by the balance of rate coefficient and the H2 density.

KW - Dissociation rate

KW - Electron energy distribution function

KW - Negative ion source

KW - Particle in cell

KW - Rf plasma

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