Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device

Keigo Yoshimura; Hiroyuki Takahashi; Tomohiro Seino; Kaoru Kusabiraki; Yuki Sakata; Ryota Nishimura; Akinobu Matsuyama; Kenji Tobita

doi:10.1585/pfr.17.1201082

Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device

Keigo Yoshimura, Hiroyuki Takahashi, Tomohiro Seino, Kaoru Kusabiraki, Yuki Sakata, Ryota Nishimura, Akinobu Matsuyama, Kenji Tobita

ENG - Quantum Science and Energy Engineering

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

1 Citation (Scopus)

Abstract

The rollover of electron density, a common indicator for the onset of volumetric recombination, was observed in hydrogen plasma, for the first time in the DT-ALPHA. Electron density and electron temperature were measured near the plasma production region and secondary gas feeding position with various conditions regarding the amount of hydrogen secondary gas. A rollover of electron density was observed at the secondary gas feeding position, whereas electron density near the plasma production region remained nearly constant. This behavior indicates an enhancement of hydrogen molecular-activated recombination.

Original language	English
Article number	1201082
Journal	Plasma and Fusion Research
Volume	17
DOIs	https://doi.org/10.1585/pfr.17.1201082
Publication status	Published - 2022

Keywords

Divertor
Dt-alpha
Hydrogen plasma
Molecular-activated recombination
Radio-frequency plasma

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title = "Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device",

abstract = "The rollover of electron density, a common indicator for the onset of volumetric recombination, was observed in hydrogen plasma, for the first time in the DT-ALPHA. Electron density and electron temperature were measured near the plasma production region and secondary gas feeding position with various conditions regarding the amount of hydrogen secondary gas. A rollover of electron density was observed at the secondary gas feeding position, whereas electron density near the plasma production region remained nearly constant. This behavior indicates an enhancement of hydrogen molecular-activated recombination.",

keywords = "Divertor, Dt-alpha, Hydrogen plasma, Molecular-activated recombination, Radio-frequency plasma",

author = "Keigo Yoshimura and Hiroyuki Takahashi and Tomohiro Seino and Kaoru Kusabiraki and Yuki Sakata and Ryota Nishimura and Akinobu Matsuyama and Kenji Tobita",

note = "Publisher Copyright: {\textcopyright} 2022. The Japan Society of Plasma Science and Nuclear Fusion Research",

year = "2022",

doi = "10.1585/pfr.17.1201082",

language = "English",

volume = "17",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

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

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T1 - Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device

AU - Yoshimura, Keigo

AU - Takahashi, Hiroyuki

AU - Seino, Tomohiro

AU - Kusabiraki, Kaoru

AU - Sakata, Yuki

AU - Nishimura, Ryota

AU - Matsuyama, Akinobu

AU - Tobita, Kenji

PY - 2022

Y1 - 2022

N2 - The rollover of electron density, a common indicator for the onset of volumetric recombination, was observed in hydrogen plasma, for the first time in the DT-ALPHA. Electron density and electron temperature were measured near the plasma production region and secondary gas feeding position with various conditions regarding the amount of hydrogen secondary gas. A rollover of electron density was observed at the secondary gas feeding position, whereas electron density near the plasma production region remained nearly constant. This behavior indicates an enhancement of hydrogen molecular-activated recombination.

AB - The rollover of electron density, a common indicator for the onset of volumetric recombination, was observed in hydrogen plasma, for the first time in the DT-ALPHA. Electron density and electron temperature were measured near the plasma production region and secondary gas feeding position with various conditions regarding the amount of hydrogen secondary gas. A rollover of electron density was observed at the secondary gas feeding position, whereas electron density near the plasma production region remained nearly constant. This behavior indicates an enhancement of hydrogen molecular-activated recombination.

KW - Divertor

KW - Dt-alpha

KW - Hydrogen plasma

KW - Molecular-activated recombination

KW - Radio-frequency plasma

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U2 - 10.1585/pfr.17.1201082

DO - 10.1585/pfr.17.1201082

M3 - Article

AN - SCOPUS:85134887237

SN - 1880-6821

VL - 17

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 1201082

ER -

Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device

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