Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge

Kazuya Ichimura; Sotaro Yamashita; Yousuke Nakashima; Masakatsu Fukumoto; Mamoru Shoji; Mizuki Sakamoto; Naomichi Ezumi; Md Maidul Islam; Md Shahinul Islam; Takayuki Yokodo; Guanyi Lee; Akihiro Terakado; Kunpei Nojiri; Tsubasa Yoshimoto; Hiromasa Takeno

doi:10.1585/PFR.13.3405029

Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge

Kazuya Ichimura, Sotaro Yamashita, Yousuke Nakashima, Masakatsu Fukumoto, Mamoru Shoji, Mizuki Sakamoto, Naomichi Ezumi, Md Maidul Islam, Md Shahinul Islam, Takayuki Yokodo, Guanyi Lee, Akihiro Terakado, Kunpei Nojiri, Tsubasa Yoshimoto, Hiromasa Takeno

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

3 Scopus citations

Abstract

Sensitivity of the ASDEX type fast ionization gauge (AIG) to several species of gases; hydrogen, nitrogen, noble gases and their mixtures have been investigated. Mixtures of hydrogen-helium and hydrogen-argon with total gas pressure from 0.2 Pa to 1.5 Pa are investigated in order to simulate the environment of divertor regions. It has been found that the observed output current of AIG in mixed gases are larger than the theoretical output current evaluated from the partial pressures and the sensitivities for pure gases. The enhancement of the AIG sensitivity observed in mixed gas conditions suggests that the ionization is enhanced due to the mixing of different gases. A qualitative analysis on the ionization reactions and their cross-sections has indicated that ionization related with metastable atoms of helium or argon is causing the changes in AIG sensitivity.

Original language	English
Article number	3405029
Journal	Plasma and Fusion Research
Volume	13
DOIs	https://doi.org/10.1585/PFR.13.3405029
State	Published - 2018
Externally published	Yes

Keywords

ASDEX gauge
Gas pressure measurement
Ionization gauge
Mixture gas

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10.1585/PFR.13.3405029

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Ichimura, K., Yamashita, S., Nakashima, Y., Fukumoto, M., Shoji, M., Sakamoto, M., Ezumi, N., Islam, M. M., Islam, M. S., Yokodo, T., Lee, G., Terakado, A., Nojiri, K., Yoshimoto, T., & Takeno, H. (2018). Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge. Plasma and Fusion Research, 13, Article 3405029. https://doi.org/10.1585/PFR.13.3405029

@article{9cf023bec5c9488883ec588081c78f36,

title = "Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge",

abstract = "Sensitivity of the ASDEX type fast ionization gauge (AIG) to several species of gases; hydrogen, nitrogen, noble gases and their mixtures have been investigated. Mixtures of hydrogen-helium and hydrogen-argon with total gas pressure from 0.2 Pa to 1.5 Pa are investigated in order to simulate the environment of divertor regions. It has been found that the observed output current of AIG in mixed gases are larger than the theoretical output current evaluated from the partial pressures and the sensitivities for pure gases. The enhancement of the AIG sensitivity observed in mixed gas conditions suggests that the ionization is enhanced due to the mixing of different gases. A qualitative analysis on the ionization reactions and their cross-sections has indicated that ionization related with metastable atoms of helium or argon is causing the changes in AIG sensitivity.",

keywords = "ASDEX gauge, Gas pressure 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 Maidul} and Islam, {Md Shahinul} and Takayuki Yokodo and Guanyi Lee and Akihiro Terakado and Kunpei Nojiri and Tsubasa Yoshimoto and Hiromasa Takeno",

note = "Publisher Copyright: {\textcopyright} 2019 The Japan Society of Plasma.",

year = "2018",

doi = "10.1585/PFR.13.3405029",

language = "English",

volume = "13",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

}

Ichimura, K, Yamashita, S, Nakashima, Y, Fukumoto, M, Shoji, M, Sakamoto, M, Ezumi, N, Islam, MM, Islam, MS, Yokodo, T, Lee, G, Terakado, A, Nojiri, K, Yoshimoto, T & Takeno, H 2018, 'Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge', Plasma and Fusion Research, vol. 13, 3405029. https://doi.org/10.1585/PFR.13.3405029

TY - JOUR

T1 - Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge

AU - Ichimura, Kazuya

AU - Yamashita, Sotaro

AU - Nakashima, Yousuke

AU - Fukumoto, Masakatsu

AU - Shoji, Mamoru

AU - Sakamoto, Mizuki

AU - Ezumi, Naomichi

AU - Islam, Md Maidul

AU - Islam, Md Shahinul

AU - Yokodo, Takayuki

AU - Lee, Guanyi

AU - Terakado, Akihiro

AU - Nojiri, Kunpei

AU - Yoshimoto, Tsubasa

AU - Takeno, Hiromasa

PY - 2018

Y1 - 2018

N2 - Sensitivity of the ASDEX type fast ionization gauge (AIG) to several species of gases; hydrogen, nitrogen, noble gases and their mixtures have been investigated. Mixtures of hydrogen-helium and hydrogen-argon with total gas pressure from 0.2 Pa to 1.5 Pa are investigated in order to simulate the environment of divertor regions. It has been found that the observed output current of AIG in mixed gases are larger than the theoretical output current evaluated from the partial pressures and the sensitivities for pure gases. The enhancement of the AIG sensitivity observed in mixed gas conditions suggests that the ionization is enhanced due to the mixing of different gases. A qualitative analysis on the ionization reactions and their cross-sections has indicated that ionization related with metastable atoms of helium or argon is causing the changes in AIG sensitivity.

AB - Sensitivity of the ASDEX type fast ionization gauge (AIG) to several species of gases; hydrogen, nitrogen, noble gases and their mixtures have been investigated. Mixtures of hydrogen-helium and hydrogen-argon with total gas pressure from 0.2 Pa to 1.5 Pa are investigated in order to simulate the environment of divertor regions. It has been found that the observed output current of AIG in mixed gases are larger than the theoretical output current evaluated from the partial pressures and the sensitivities for pure gases. The enhancement of the AIG sensitivity observed in mixed gas conditions suggests that the ionization is enhanced due to the mixing of different gases. A qualitative analysis on the ionization reactions and their cross-sections has indicated that ionization related with metastable atoms of helium or argon is causing the changes in AIG sensitivity.

KW - ASDEX gauge

KW - Gas pressure measurement

KW - Ionization gauge

KW - Mixture gas

UR - http://www.scopus.com/inward/record.url?scp=85063607581&partnerID=8YFLogxK

U2 - 10.1585/PFR.13.3405029

DO - 10.1585/PFR.13.3405029

M3 - Article

AN - SCOPUS:85063607581

SN - 1880-6821

VL - 13

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 3405029

ER -

Gas pressure measurements in pure and mixed gases at around 1.0 Pa by using ASDEX type fast ionization gauge

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