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

H. Idei; T. Onchi; T. Kariya; T. I. Tsujimura; S. Kubo; S. Kobayashi; M. Sakaguchi; T. Imai; M. Hasegawa; K. Nakamura; K. Mishra; M. Fukuyama; M. Yunoki; S. Kojima; O. Watanabe; K. Kuroda; K. Hanada; Y. Nagashima; A. Ejiri; N. Matsumoto; M. Ono; A. Higashijima; T. Nagata; S. Shimabukoro; Y. Takase; A. Fukuyama; S. Murakami

doi:10.1016/j.fusengdes.2019.02.027

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

H. Idei, T. Onchi, T. Kariya, T. I. Tsujimura, S. Kubo, S. Kobayashi, M. Sakaguchi, T. Imai, M. Hasegawa, K. Nakamura, K. Mishra, M. Fukuyama, M. Yunoki, S. Kojima, O. Watanabe, K. Kuroda, K. Hanada, Y. Nagashima, A. Ejiri, N. MatsumotoM. Ono, A. Higashijima, T. Nagata, S. Shimabukoro, Y. Takase, A. Fukuyama, S. Murakami

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11 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1149-1152
Number of pages	4
Journal	Fusion Engineering and Design
Volume	146
DOIs	https://doi.org/10.1016/j.fusengdes.2019.02.027
Publication status	Published - Sept 2019

All Science Journal Classification (ASJC) codes

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

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10.1016/j.fusengdes.2019.02.027

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Idei, H., Onchi, T., Kariya, T., Tsujimura, T. I., 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., ... Murakami, S. (2019). 28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak. Fusion Engineering and Design, 146, 1149-1152. https://doi.org/10.1016/j.fusengdes.2019.02.027

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, vol. 146, pp. 1149-1152. https://doi.org/10.1016/j.fusengdes.2019.02.027

@article{37c286cb1b2c4ebe87c72f777575182a,

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 = "H. Idei and T. Onchi and T. Kariya and Tsujimura, {T. I.} and S. Kubo and S. Kobayashi and M. Sakaguchi and T. Imai and M. Hasegawa and K. Nakamura and K. Mishra and M. Fukuyama and M. Yunoki and S. Kojima and O. Watanabe and K. Kuroda and K. Hanada and Y. 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",

note = "Funding Information: This work was performed under the auspices and support of the NIFS Collaboration Research Programs under Grants NIFS13KUTR085 and NIFS17KUTR128. This research was partially supported by Grant-in-Aid for Scientific Research (B) (JSPS KAKENHI Grant No. JP1504231). Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = sep,

doi = "10.1016/j.fusengdes.2019.02.027",

language = "English",

volume = "146",

pages = "1149--1152",

journal = "Fusion Engineering and Design",

issn = "0920-3796",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - 28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak

AU - Idei, H.

AU - Onchi, T.

AU - Kariya, T.

AU - Tsujimura, T. I.

AU - Kubo, S.

AU - Kobayashi, S.

AU - Sakaguchi, M.

AU - Imai, T.

AU - Hasegawa, M.

AU - Nakamura, K.

AU - Mishra, K.

AU - Fukuyama, M.

AU - Yunoki, M.

AU - Kojima, S.

AU - Watanabe, O.

AU - Kuroda, K.

AU - Hanada, K.

AU - Nagashima, Y.

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.

N1 - Funding Information: This work was performed under the auspices and support of the NIFS Collaboration Research Programs under Grants NIFS13KUTR085 and NIFS17KUTR128. This research was partially supported by Grant-in-Aid for Scientific Research (B) (JSPS KAKENHI Grant No. JP1504231). Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/9

Y1 - 2019/9

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.

AB - 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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U2 - 10.1016/j.fusengdes.2019.02.027

DO - 10.1016/j.fusengdes.2019.02.027

M3 - Article

AN - SCOPUS:85061828012

SN - 0920-3796

VL - 146

SP - 1149

EP - 1152

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

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

Abstract

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