28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak

Hiroshi Idei, Takumi Onchi, T. Kariya, T. I. Tsujimura, S. Kubo, S. Kobayashi, M. Sakaguchi, T. Imai, Makoto Hasegawa, K. Nakamura, K. Mishra, M. Fukuyama, M. Yunoki, S. Kojima, O. Watanabe, K. Kuroda, Kazuaki Hanada, Yoshihiko Nagashima, A. Ejiri, N. Matsumoto & 7 others M. Ono, A. Higashijima, T. Nagata, S. Shimabukoro, Y. Takase, A. Fukuyama, S. Murakami

研究成果: ジャーナルへの寄稿記事

抄録

New polarizer and launcher systems on a 28-GHz electron-cyclotron (EC) heating and current drive (HCD) system have been developed for non-inductive second-harmonic EC-plasma-current ramp-up in the QUEST spherical tokamak. A launcher system with two quasi-optical mirrors providing beam steering capability was designed to focus the incident beam to a small-sized waist of ∼0.05 m at the second-harmonic EC resonance layer. A relatively large focusing mirror was designed based on a Kirchhoff integral code developed to derive wave solutions. The focusing property of the launched beam was first confirmed with a 3-dimensional (3D) electromagnetic-wave simulator. Focusing characteristics were also checked at low-power test facilities, together with the steering capability. The performance of this launcher system was demonstrated to work as designed, and assembled in the QUEST device. The system was applied to the non-inductive second-harmonic EC plasma ramp-up experiments with no optimization required regarding the incident polarization. The results obtained for the non-inductive plasma ramp-up are also presented.

元の言語英語
ジャーナルFusion Engineering and Design
DOI
出版物ステータス出版済み - 1 1 2019

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Cyclotrons
Plasmas
Electrons
Electron cyclotron resonance
Test facilities
Electromagnetic waves
Mirrors
Simulators
Polarization
Heating
Experiments

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

これを引用

28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak. / Idei, Hiroshi; Onchi, Takumi; Kariya, T.; Tsujimura, T. I.; Kubo, S.; Kobayashi, S.; Sakaguchi, M.; Imai, T.; Hasegawa, Makoto; Nakamura, K.; Mishra, K.; Fukuyama, M.; Yunoki, M.; Kojima, S.; Watanabe, O.; Kuroda, K.; Hanada, Kazuaki; Nagashima, Yoshihiko; Ejiri, A.; Matsumoto, N.; Ono, M.; Higashijima, A.; Nagata, T.; Shimabukoro, S.; Takase, Y.; Fukuyama, A.; Murakami, S.

:: Fusion Engineering and Design, 01.01.2019.

研究成果: ジャーナルへの寄稿記事

Idei, H, Onchi, T, Kariya, T, Tsujimura, TI, Kubo, S, Kobayashi, S, Sakaguchi, M, Imai, T, Hasegawa, M, Nakamura, K, Mishra, K, Fukuyama, M, Yunoki, M, Kojima, S, Watanabe, O, Kuroda, K, Hanada, K, Nagashima, Y, Ejiri, A, Matsumoto, N, Ono, M, Higashijima, A, Nagata, T, Shimabukoro, S, Takase, Y, Fukuyama, A & Murakami, S 2019, '28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak', Fusion Engineering and Design. https://doi.org/10.1016/j.fusengdes.2019.02.027
Idei, Hiroshi ; Onchi, Takumi ; Kariya, T. ; Tsujimura, T. I. ; Kubo, S. ; Kobayashi, S. ; Sakaguchi, M. ; Imai, T. ; Hasegawa, Makoto ; Nakamura, K. ; Mishra, K. ; Fukuyama, M. ; Yunoki, M. ; Kojima, S. ; Watanabe, O. ; Kuroda, K. ; Hanada, Kazuaki ; Nagashima, Yoshihiko ; Ejiri, A. ; Matsumoto, N. ; Ono, M. ; Higashijima, A. ; Nagata, T. ; Shimabukoro, S. ; Takase, Y. ; Fukuyama, A. ; Murakami, S. / 28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak. :: Fusion Engineering and Design. 2019.
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title = "28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak",
abstract = "New polarizer and launcher systems on a 28-GHz electron-cyclotron (EC) heating and current drive (HCD) system have been developed for non-inductive second-harmonic EC-plasma-current ramp-up in the QUEST spherical tokamak. A launcher system with two quasi-optical mirrors providing beam steering capability was designed to focus the incident beam to a small-sized waist of ∼0.05 m at the second-harmonic EC resonance layer. A relatively large focusing mirror was designed based on a Kirchhoff integral code developed to derive wave solutions. The focusing property of the launched beam was first confirmed with a 3-dimensional (3D) electromagnetic-wave simulator. Focusing characteristics were also checked at low-power test facilities, together with the steering capability. The performance of this launcher system was demonstrated to work as designed, and assembled in the QUEST device. The system was applied to the non-inductive second-harmonic EC plasma ramp-up experiments with no optimization required regarding the incident polarization. The results obtained for the non-inductive plasma ramp-up are also presented.",
author = "Hiroshi Idei and Takumi Onchi and T. Kariya and Tsujimura, {T. I.} and S. Kubo and S. Kobayashi and M. Sakaguchi and T. Imai and Makoto Hasegawa and K. Nakamura and K. Mishra and M. Fukuyama and M. Yunoki and S. Kojima and O. Watanabe and K. Kuroda and Kazuaki Hanada and Yoshihiko Nagashima and A. Ejiri and N. Matsumoto and M. Ono and A. Higashijima and T. Nagata and S. Shimabukoro and Y. Takase and A. Fukuyama and S. Murakami",
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AU - Idei, Hiroshi

AU - Onchi, Takumi

AU - Kariya, T.

AU - Tsujimura, T. I.

AU - Kubo, S.

AU - Kobayashi, S.

AU - Sakaguchi, M.

AU - Imai, T.

AU - Hasegawa, Makoto

AU - Nakamura, K.

AU - Mishra, K.

AU - Fukuyama, M.

AU - Yunoki, M.

AU - Kojima, S.

AU - Watanabe, O.

AU - Kuroda, K.

AU - Hanada, Kazuaki

AU - Nagashima, Yoshihiko

AU - Ejiri, A.

AU - Matsumoto, N.

AU - Ono, M.

AU - Higashijima, A.

AU - Nagata, T.

AU - Shimabukoro, S.

AU - Takase, Y.

AU - Fukuyama, A.

AU - Murakami, S.

PY - 2019/1/1

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N2 - New polarizer and launcher systems on a 28-GHz electron-cyclotron (EC) heating and current drive (HCD) system have been developed for non-inductive second-harmonic EC-plasma-current ramp-up in the QUEST spherical tokamak. A launcher system with two quasi-optical mirrors providing beam steering capability was designed to focus the incident beam to a small-sized waist of ∼0.05 m at the second-harmonic EC resonance layer. A relatively large focusing mirror was designed based on a Kirchhoff integral code developed to derive wave solutions. The focusing property of the launched beam was first confirmed with a 3-dimensional (3D) electromagnetic-wave simulator. Focusing characteristics were also checked at low-power test facilities, together with the steering capability. The performance of this launcher system was demonstrated to work as designed, and assembled in the QUEST device. The system was applied to the non-inductive second-harmonic EC plasma ramp-up experiments with no optimization required regarding the incident polarization. The results obtained for the non-inductive plasma ramp-up are also presented.

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