Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators

Kazuya Ichimura; Sotaro Yamashita; Yousuke Nakashima; Masakatsu Fukumoto; Mamoru Shoji; Mizuki Sakamoto; Naomichi Ezumi; Md Shahinul Islam; Akihiro Terakado; Kunpei Nojiri; Tsubasa Yoshimoto; Toshiki Hara; Hiromasa Takeno

doi:10.1585/pfr.14.2405029

Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators

Kazuya Ichimura, Sotaro Yamashita, Yousuke Nakashima, Masakatsu Fukumoto, Mamoru Shoji, Mizuki Sakamoto, Naomichi Ezumi, Md Shahinul Islam, Akihiro Terakado, Kunpei Nojiri, Tsubasa Yoshimoto, Toshiki Hara, Hiromasa Takeno

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

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Abstract

The sensitivity of the ASDEX type ionization gauge (AIG) in the mixture of argon and hydrogen gas, which is a candidate of radiator gas in the radiative divertor, is studied. In a small vacuum chamber, the sensitivity of the AIG is calibrated against capacitance-manometers, which have constant sensitivity for all gas species. Increase of the output signal AIG was observed in the mixture of 25% Ar and 75% H₂, although the actual sensitivity of the gauge against gas pressure is degraded. In the gas pressure larger than 0.8 Pa, the degradation of the sensitivity will be the main concern of the measurements. The results indicated that the molecular ions produced by the collision between the metastable argon atom and hydrogen molecule is the main cause of the change of the sensitivity. The change of sensitivity is analyzed by varying the collision energy of the electrons and the ionization cross-section of the ArH molecular ion is evaluated.

Original language	English
Article number	2405029
Journal	Plasma and Fusion Research
Volume	14
Issue number	Specialissue1
DOIs	https://doi.org/10.1585/pfr.14.2405029
State	Published - 2019
Externally published	Yes

Keywords

Asdex gauge
Divertor
Gas measurement
Ionization gauge
Mixture gas

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1585/pfr.14.2405029

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Ichimura, K., Yamashita, S., Nakashima, Y., Fukumoto, M., Shoji, M., Sakamoto, M., Ezumi, N., Islam, M. S., Terakado, A., Nojiri, K., Yoshimoto, T., Hara, T., & Takeno, H. (2019). Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators. Plasma and Fusion Research, 14(Specialissue1), Article 2405029. https://doi.org/10.1585/pfr.14.2405029

@article{187bcaaf916e4c38b3b1372110d44df2,

title = "Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators",

abstract = "The sensitivity of the ASDEX type ionization gauge (AIG) in the mixture of argon and hydrogen gas, which is a candidate of radiator gas in the radiative divertor, is studied. In a small vacuum chamber, the sensitivity of the AIG is calibrated against capacitance-manometers, which have constant sensitivity for all gas species. Increase of the output signal AIG was observed in the mixture of 25% Ar and 75% H2, although the actual sensitivity of the gauge against gas pressure is degraded. In the gas pressure larger than 0.8 Pa, the degradation of the sensitivity will be the main concern of the measurements. The results indicated that the molecular ions produced by the collision between the metastable argon atom and hydrogen molecule is the main cause of the change of the sensitivity. The change of sensitivity is analyzed by varying the collision energy of the electrons and the ionization cross-section of the ArH molecular ion is evaluated.",

keywords = "Asdex gauge, Divertor, Gas measurement, Ionization gauge, Mixture gas",

author = "Kazuya Ichimura and Sotaro Yamashita and Yousuke Nakashima and Masakatsu Fukumoto and Mamoru Shoji and Mizuki Sakamoto and Naomichi Ezumi and Islam, {Md Shahinul} and Akihiro Terakado and Kunpei Nojiri and Tsubasa Yoshimoto and Toshiki Hara and Hiromasa Takeno",

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

year = "2019",

doi = "10.1585/pfr.14.2405029",

language = "English",

volume = "14",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

number = "Specialissue1",

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Ichimura, K, Yamashita, S, Nakashima, Y, Fukumoto, M, Shoji, M, Sakamoto, M, Ezumi, N, Islam, MS, Terakado, A, Nojiri, K, Yoshimoto, T, Hara, T & Takeno, H 2019, 'Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators', Plasma and Fusion Research, vol. 14, no. Specialissue1, 2405029. https://doi.org/10.1585/pfr.14.2405029

TY - JOUR

T1 - Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators

AU - Ichimura, Kazuya

AU - Yamashita, Sotaro

AU - Nakashima, Yousuke

AU - Fukumoto, Masakatsu

AU - Shoji, Mamoru

AU - Sakamoto, Mizuki

AU - Ezumi, Naomichi

AU - Islam, Md Shahinul

AU - Terakado, Akihiro

AU - Nojiri, Kunpei

AU - Yoshimoto, Tsubasa

AU - Hara, Toshiki

AU - Takeno, Hiromasa

PY - 2019

Y1 - 2019

N2 - The sensitivity of the ASDEX type ionization gauge (AIG) in the mixture of argon and hydrogen gas, which is a candidate of radiator gas in the radiative divertor, is studied. In a small vacuum chamber, the sensitivity of the AIG is calibrated against capacitance-manometers, which have constant sensitivity for all gas species. Increase of the output signal AIG was observed in the mixture of 25% Ar and 75% H2, although the actual sensitivity of the gauge against gas pressure is degraded. In the gas pressure larger than 0.8 Pa, the degradation of the sensitivity will be the main concern of the measurements. The results indicated that the molecular ions produced by the collision between the metastable argon atom and hydrogen molecule is the main cause of the change of the sensitivity. The change of sensitivity is analyzed by varying the collision energy of the electrons and the ionization cross-section of the ArH molecular ion is evaluated.

AB - The sensitivity of the ASDEX type ionization gauge (AIG) in the mixture of argon and hydrogen gas, which is a candidate of radiator gas in the radiative divertor, is studied. In a small vacuum chamber, the sensitivity of the AIG is calibrated against capacitance-manometers, which have constant sensitivity for all gas species. Increase of the output signal AIG was observed in the mixture of 25% Ar and 75% H2, although the actual sensitivity of the gauge against gas pressure is degraded. In the gas pressure larger than 0.8 Pa, the degradation of the sensitivity will be the main concern of the measurements. The results indicated that the molecular ions produced by the collision between the metastable argon atom and hydrogen molecule is the main cause of the change of the sensitivity. The change of sensitivity is analyzed by varying the collision energy of the electrons and the ionization cross-section of the ArH molecular ion is evaluated.

KW - Asdex gauge

KW - Divertor

KW - Gas measurement

KW - Ionization gauge

KW - Mixture gas

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U2 - 10.1585/pfr.14.2405029

DO - 10.1585/pfr.14.2405029

M3 - Article

AN - SCOPUS:85063607725

SN - 1880-6821

VL - 14

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

IS - Specialissue1

M1 - 2405029

ER -

Analysis on the sensitivity of the ASDEX type ionization gauge in mixed radiator gases of divertor simulators

Abstract

Keywords

UN SDGs

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