Characteristics of upstream and downstream plasma parameters from langmuir probes and visible spectrometers in the D-Module of GAMMA 10/PDX

Takaaki Iijima; Toshiki Hara; Kunpei Nojiri; Akihiro Terakado; Md Shahinul Islam; Tsubasa Yoshimoto; Sotaro Yamashita; Naomichi Ezumi; Mizuki Sakamoto; Yousuke Nakashima

doi:10.1585/PFR.14.2401156

Characteristics of upstream and downstream plasma parameters from langmuir probes and visible spectrometers in the D-Module of GAMMA 10/PDX

Takaaki Iijima
, Toshiki Hara
, Kunpei Nojiri
, Akihiro Terakado
, Md Shahinul Islam
, Tsubasa Yoshimoto
, Sotaro Yamashita
, Naomichi Ezumi
, Mizuki Sakamoto
, Yousuke Nakashima

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

1 Scopus citations

Abstract

Plasma parameters in the upstream and downstream regions in the divertor simulation experimental module (D-module) of the tandem mirror plasma device GAMMA 10/PDX were conducted using Langmuir probes. The detached plasma was produced using hydrogen puffing. In the upstream region, the electron temperature decreased from 30 to 7 eV, and the electron density increased. On the other hand, rollover of ne at the V-shaped corner was observed in the downstream region. Increasing HΑ/HΒ at the corner of the V-shaped target was attributed to the molecular activated recombination processes. Ha/Hß in the downstream region was different from that in the upstream region. Therefore, the ionization front appeared in the upstream region of the Dmodule.

Original language	English
Article number	1156
Journal	Plasma and Fusion Research
Volume	14
DOIs	https://doi.org/10.1585/PFR.14.2401156
State	Published - 2019
Externally published	Yes

Keywords

Detached plasma
Divertor
GAMMA 10/PDX
Molecular activated recombination

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10.1585/PFR.14.2401156

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@article{60d4b4183f924022a93a6e5cb364c4c1,

title = "Characteristics of upstream and downstream plasma parameters from langmuir probes and visible spectrometers in the D-Module of GAMMA 10/PDX",

abstract = "Plasma parameters in the upstream and downstream regions in the divertor simulation experimental module (D-module) of the tandem mirror plasma device GAMMA 10/PDX were conducted using Langmuir probes. The detached plasma was produced using hydrogen puffing. In the upstream region, the electron temperature decreased from 30 to 7 eV, and the electron density increased. On the other hand, rollover of ne at the V-shaped corner was observed in the downstream region. Increasing HΑ/HΒ at the corner of the V-shaped target was attributed to the molecular activated recombination processes. Ha/H{\ss} in the downstream region was different from that in the upstream region. Therefore, the ionization front appeared in the upstream region of the Dmodule.",

keywords = "Detached plasma, Divertor, GAMMA 10/PDX, Molecular activated recombination",

author = "Takaaki Iijima and Toshiki Hara and Kunpei Nojiri and Akihiro Terakado and Islam, \{Md Shahinul\} and Tsubasa Yoshimoto and Sotaro Yamashita and Naomichi Ezumi and Mizuki Sakamoto and Yousuke Nakashima",

note = "Publisher Copyright: {\textcopyright} 2019 The Japan Society of Plasma Science and Nuclear Fusion Research.",

year = "2019",

doi = "10.1585/PFR.14.2401156",

language = "English",

volume = "14",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

}

TY - JOUR

T1 - Characteristics of upstream and downstream plasma parameters from langmuir probes and visible spectrometers in the D-Module of GAMMA 10/PDX

AU - Iijima, Takaaki

AU - Hara, Toshiki

AU - Nojiri, Kunpei

AU - Terakado, Akihiro

AU - Islam, Md Shahinul

AU - Yoshimoto, Tsubasa

AU - Yamashita, Sotaro

AU - Ezumi, Naomichi

AU - Sakamoto, Mizuki

AU - Nakashima, Yousuke

PY - 2019

Y1 - 2019

N2 - Plasma parameters in the upstream and downstream regions in the divertor simulation experimental module (D-module) of the tandem mirror plasma device GAMMA 10/PDX were conducted using Langmuir probes. The detached plasma was produced using hydrogen puffing. In the upstream region, the electron temperature decreased from 30 to 7 eV, and the electron density increased. On the other hand, rollover of ne at the V-shaped corner was observed in the downstream region. Increasing HΑ/HΒ at the corner of the V-shaped target was attributed to the molecular activated recombination processes. Ha/Hß in the downstream region was different from that in the upstream region. Therefore, the ionization front appeared in the upstream region of the Dmodule.

AB - Plasma parameters in the upstream and downstream regions in the divertor simulation experimental module (D-module) of the tandem mirror plasma device GAMMA 10/PDX were conducted using Langmuir probes. The detached plasma was produced using hydrogen puffing. In the upstream region, the electron temperature decreased from 30 to 7 eV, and the electron density increased. On the other hand, rollover of ne at the V-shaped corner was observed in the downstream region. Increasing HΑ/HΒ at the corner of the V-shaped target was attributed to the molecular activated recombination processes. Ha/Hß in the downstream region was different from that in the upstream region. Therefore, the ionization front appeared in the upstream region of the Dmodule.

KW - Detached plasma

KW - Divertor

KW - GAMMA 10/PDX

KW - Molecular activated recombination

UR - https://www.scopus.com/pages/publications/85083193624

U2 - 10.1585/PFR.14.2401156

DO - 10.1585/PFR.14.2401156

M3 - Article

AN - SCOPUS:85083193624

SN - 1880-6821

VL - 14

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 1156

ER -

Characteristics of upstream and downstream plasma parameters from langmuir probes and visible spectrometers in the D-Module of GAMMA 10/PDX

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Keywords

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