Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak

Masakatsu Fukumoto; Qilin Yue; Kazuaki Hanada; Shinichiro Kojima; Tomohide Nakano; Naoaki Yoshida; Ryuya Ikezoe; Yoshihiko Nagashima; Takeshi Ido; Takumi Onchi; Hiroshi Idei; Hiroki Iguchi; Takumi Komiyama; Taiichi Shikama; Akira Ejiri; Suguru Masuzaki; Mizuki Sakamoto; Yoshio Ueda; Kengoh Kuroda; Kaori Kono; Shun Shimabukuro; Aki Higashijima

doi:10.1088/1741-4326/ad3d6e

Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak

Masakatsu Fukumoto, Qilin Yue, Kazuaki Hanada, Shinichiro Kojima, Tomohide Nakano, Naoaki Yoshida, Ryuya Ikezoe, Yoshihiko Nagashima, Takeshi Ido, Takumi Onchi, Hiroshi Idei, Hiroki Iguchi, Takumi Komiyama, Taiichi Shikama, Akira Ejiri, Suguru Masuzaki, Mizuki Sakamoto, Yoshio Ueda, Kengoh Kuroda, Kaori KonoShun Shimabukuro, Aki Higashijima

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

1 Citation (Scopus)

Abstract

Electron cyclotron wall conditioning with neon gas (Ne-ECWC) has been performed on the normal conducting spherial tokamak QUEST with metal walls under a trapped particle configuration with O-mode EC waves including X-mode polarization with a frequency of 8.2 GHz and an injection power of 16 kW. The Ne-ECWC removes hydrogen from the wall with small neon retention. The Ne-ECWC decreases hydrogen recycling at the following tokamak discharges, contributing to an improvement of the following tokamak plasma start-up: the plasma current increases and the start-up timing of the plasma current shifts forward. However, defects such as voids and bubbles are formed on tungsten surface exposed to the Ne-ECWC plasma.

Original language	English
Article number	066022
Journal	Nuclear Fusion
Volume	64
Issue number	6
DOIs	https://doi.org/10.1088/1741-4326/ad3d6e
Publication status	Published - Jun 2024
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/1741-4326/ad3d6e

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Fukumoto, M., Yue, Q., Hanada, K., Kojima, S., Nakano, T., Yoshida, N., Ikezoe, R., Nagashima, Y., Ido, T., Onchi, T., Idei, H., Iguchi, H., Komiyama, T., Shikama, T., Ejiri, A., Masuzaki, S., Sakamoto, M., Ueda, Y., Kuroda, K., ... Higashijima, A. (2024). Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak. Nuclear Fusion, 64(6), Article 066022. https://doi.org/10.1088/1741-4326/ad3d6e

Fukumoto, M, Yue, Q, Hanada, K, Kojima, S, Nakano, T, Yoshida, N, Ikezoe, R , Nagashima, Y , Ido, T , Onchi, T , Idei, H, Iguchi, H, Komiyama, T, Shikama, T, Ejiri, A, Masuzaki, S, Sakamoto, M, Ueda, Y, Kuroda, K, Kono, K, Shimabukuro, S & Higashijima, A 2024, 'Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak', Nuclear Fusion, vol. 64, no. 6, 066022. https://doi.org/10.1088/1741-4326/ad3d6e

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title = "Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak",

abstract = "Electron cyclotron wall conditioning with neon gas (Ne-ECWC) has been performed on the normal conducting spherial tokamak QUEST with metal walls under a trapped particle configuration with O-mode EC waves including X-mode polarization with a frequency of 8.2 GHz and an injection power of 16 kW. The Ne-ECWC removes hydrogen from the wall with small neon retention. The Ne-ECWC decreases hydrogen recycling at the following tokamak discharges, contributing to an improvement of the following tokamak plasma start-up: the plasma current increases and the start-up timing of the plasma current shifts forward. However, defects such as voids and bubbles are formed on tungsten surface exposed to the Ne-ECWC plasma.",

keywords = "QUEST, electron cyclotron wall conditioning, hydrogen removal, neon",

author = "Masakatsu Fukumoto and Qilin Yue and Kazuaki Hanada and Shinichiro Kojima and Tomohide Nakano and Naoaki Yoshida and Ryuya Ikezoe and Yoshihiko Nagashima and Takeshi Ido and Takumi Onchi and Hiroshi Idei and Hiroki Iguchi and Takumi Komiyama and Taiichi Shikama and Akira Ejiri and Suguru Masuzaki and Mizuki Sakamoto and Yoshio Ueda and Kengoh Kuroda and Kaori Kono and Shun Shimabukuro and Aki Higashijima",

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doi = "10.1088/1741-4326/ad3d6e",

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AU - Fukumoto, Masakatsu

AU - Yue, Qilin

AU - Hanada, Kazuaki

AU - Kojima, Shinichiro

AU - Nakano, Tomohide

AU - Yoshida, Naoaki

AU - Ikezoe, Ryuya

AU - Nagashima, Yoshihiko

AU - Ido, Takeshi

AU - Onchi, Takumi

AU - Idei, Hiroshi

AU - Iguchi, Hiroki

AU - Komiyama, Takumi

AU - Shikama, Taiichi

AU - Ejiri, Akira

AU - Masuzaki, Suguru

AU - Sakamoto, Mizuki

AU - Ueda, Yoshio

AU - Kuroda, Kengoh

AU - Kono, Kaori

AU - Shimabukuro, Shun

AU - Higashijima, Aki

PY - 2024/6

Y1 - 2024/6

N2 - Electron cyclotron wall conditioning with neon gas (Ne-ECWC) has been performed on the normal conducting spherial tokamak QUEST with metal walls under a trapped particle configuration with O-mode EC waves including X-mode polarization with a frequency of 8.2 GHz and an injection power of 16 kW. The Ne-ECWC removes hydrogen from the wall with small neon retention. The Ne-ECWC decreases hydrogen recycling at the following tokamak discharges, contributing to an improvement of the following tokamak plasma start-up: the plasma current increases and the start-up timing of the plasma current shifts forward. However, defects such as voids and bubbles are formed on tungsten surface exposed to the Ne-ECWC plasma.

AB - Electron cyclotron wall conditioning with neon gas (Ne-ECWC) has been performed on the normal conducting spherial tokamak QUEST with metal walls under a trapped particle configuration with O-mode EC waves including X-mode polarization with a frequency of 8.2 GHz and an injection power of 16 kW. The Ne-ECWC removes hydrogen from the wall with small neon retention. The Ne-ECWC decreases hydrogen recycling at the following tokamak discharges, contributing to an improvement of the following tokamak plasma start-up: the plasma current increases and the start-up timing of the plasma current shifts forward. However, defects such as voids and bubbles are formed on tungsten surface exposed to the Ne-ECWC plasma.

KW - QUEST

KW - electron cyclotron wall conditioning

KW - hydrogen removal

KW - neon

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VL - 64

JO - Nuclear Fusion

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M1 - 066022

ER -

Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak

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