Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

H. Idei; T. Kariya; T. Imai; K. Mishra; T. Onchi; O. Watanabe; H. Zushi; K. Hanada; J. Qian; A. Ejiri; M. M. Alam; Kazuo Nakamura; A. Fujisawa; Y. Nagashima; M. Hasegawa; K. Matsuoka; A. Fukuyama; S. Kubo; T. Shimozuma; M. Yoshikawa; M. Sakamoto; S. Kawasaki; H. Nakashima; A. Higashijima; S. Ide; T. Maekawa; Y. Takase; K. Toi

doi:10.1088/1741-4326/aa7c20

Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

H. Idei, T. Kariya, T. Imai, K. Mishra, T. Onchi, O. Watanabe, H. Zushi, K. Hanada, J. Qian, A. Ejiri, M. M. Alam, Kazuo Nakamura, A. Fujisawa, Y. Nagashima, M. Hasegawa, K. Matsuoka, A. Fukuyama, S. Kubo, T. Shimozuma, M. YoshikawaM. Sakamoto, S. Kawasaki, H. Nakashima, A. Higashijima, S. Ide, T. Maekawa, Y. Takase, K. Toi

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Abstract

Fully non-inductive second (2nd) harmonic electron cyclotron (EC) plasma current ramp-up was demonstrated with a newlly developed 28 GHz system in the QUEST spherical tokamak. A high plasma current of 54 kA was non-inductively ramped up and sustained stably for 0.9 s with a 270 kW 28 GHz wave. A higher plasma current of 66 kA was also non-inductively achieved with a slow ramp-up of the vertical field. We have achieved a significantly higher plasma current than those achieved previously with the 2nd harmonic EC waves. This fully non-inductive 2nd harmonic EC plasma ramp-up method might be useful for future burning plasma devices and fusion reactors, in particular for operations at half magnetic field with the same EC heating equipment.

Original language	English
Article number	126045
Journal	Nuclear Fusion
Volume	57
Issue number	12
DOIs	https://doi.org/10.1088/1741-4326/aa7c20
Publication status	Published - Oct 5 2017

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/1741-4326/aa7c20

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Idei, H., Kariya, T., Imai, T., Mishra, K., Onchi, T., Watanabe, O., Zushi, H., Hanada, K., Qian, J., Ejiri, A., Alam, M. M., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Fukuyama, A., Kubo, S., Shimozuma, T., ... Toi, K. (2017). Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak. Nuclear Fusion, 57(12), Article 126045. https://doi.org/10.1088/1741-4326/aa7c20

Idei, H, Kariya, T, Imai, T, Mishra, K, Onchi, T, Watanabe, O, Zushi, H, Hanada, K, Qian, J, Ejiri, A, Alam, MM, Nakamura, K, Fujisawa, A , Nagashima, Y , Hasegawa, M, Matsuoka, K, Fukuyama, A, Kubo, S, Shimozuma, T, Yoshikawa, M, Sakamoto, M, Kawasaki, S, Nakashima, H, Higashijima, A, Ide, S, Maekawa, T, Takase, Y & Toi, K 2017, 'Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak', Nuclear Fusion, vol. 57, no. 12, 126045. https://doi.org/10.1088/1741-4326/aa7c20

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title = "Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak",

abstract = "Fully non-inductive second (2nd) harmonic electron cyclotron (EC) plasma current ramp-up was demonstrated with a newlly developed 28 GHz system in the QUEST spherical tokamak. A high plasma current of 54 kA was non-inductively ramped up and sustained stably for 0.9 s with a 270 kW 28 GHz wave. A higher plasma current of 66 kA was also non-inductively achieved with a slow ramp-up of the vertical field. We have achieved a significantly higher plasma current than those achieved previously with the 2nd harmonic EC waves. This fully non-inductive 2nd harmonic EC plasma ramp-up method might be useful for future burning plasma devices and fusion reactors, in particular for operations at half magnetic field with the same EC heating equipment.",

author = "H. Idei and T. Kariya and T. Imai and K. Mishra and T. Onchi and O. Watanabe and H. Zushi and K. Hanada and J. Qian and A. Ejiri and Alam, {M. M.} and Kazuo Nakamura and A. Fujisawa and Y. Nagashima and M. Hasegawa and K. Matsuoka and A. Fukuyama and S. Kubo and T. Shimozuma and M. Yoshikawa and M. Sakamoto and S. Kawasaki and H. Nakashima and A. Higashijima and S. Ide and T. Maekawa and Y. Takase and K. Toi",

note = "Funding Information: The author (H.I.) would like to express thanks to Dr. M. Ono of the Princeton Plasma Physics Laboratory for his valuable comments. This work was performed under the auspices and support of the NIFS Collaboration Research Programs under Grants NIFS09KUTR046, NIFS10KUTR048, NIFS11KUTR059, and NIFS11KUTR069. This research was partially supported by Grant-in-Aid for Scientific Research (B) (JSPS KAKENHI Grant Number JP1504231). Publisher Copyright: {\textcopyright} 2017 IAEA, Vienna.",

year = "2017",

month = oct,

day = "5",

doi = "10.1088/1741-4326/aa7c20",

language = "English",

volume = "57",

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T1 - Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

AU - Idei, H.

AU - Kariya, T.

AU - Imai, T.

AU - Mishra, K.

AU - Onchi, T.

AU - Watanabe, O.

AU - Zushi, H.

AU - Hanada, K.

AU - Qian, J.

AU - Ejiri, A.

AU - Alam, M. M.

AU - Nakamura, Kazuo

AU - Fujisawa, A.

AU - Nagashima, Y.

AU - Hasegawa, M.

AU - Matsuoka, K.

AU - Fukuyama, A.

AU - Kubo, S.

AU - Shimozuma, T.

AU - Yoshikawa, M.

AU - Sakamoto, M.

AU - Kawasaki, S.

AU - Nakashima, H.

AU - Higashijima, A.

AU - Ide, S.

AU - Maekawa, T.

AU - Takase, Y.

AU - Toi, K.

N1 - Funding Information: The author (H.I.) would like to express thanks to Dr. M. Ono of the Princeton Plasma Physics Laboratory for his valuable comments. This work was performed under the auspices and support of the NIFS Collaboration Research Programs under Grants NIFS09KUTR046, NIFS10KUTR048, NIFS11KUTR059, and NIFS11KUTR069. This research was partially supported by Grant-in-Aid for Scientific Research (B) (JSPS KAKENHI Grant Number JP1504231). Publisher Copyright: © 2017 IAEA, Vienna.

PY - 2017/10/5

Y1 - 2017/10/5

N2 - Fully non-inductive second (2nd) harmonic electron cyclotron (EC) plasma current ramp-up was demonstrated with a newlly developed 28 GHz system in the QUEST spherical tokamak. A high plasma current of 54 kA was non-inductively ramped up and sustained stably for 0.9 s with a 270 kW 28 GHz wave. A higher plasma current of 66 kA was also non-inductively achieved with a slow ramp-up of the vertical field. We have achieved a significantly higher plasma current than those achieved previously with the 2nd harmonic EC waves. This fully non-inductive 2nd harmonic EC plasma ramp-up method might be useful for future burning plasma devices and fusion reactors, in particular for operations at half magnetic field with the same EC heating equipment.

AB - Fully non-inductive second (2nd) harmonic electron cyclotron (EC) plasma current ramp-up was demonstrated with a newlly developed 28 GHz system in the QUEST spherical tokamak. A high plasma current of 54 kA was non-inductively ramped up and sustained stably for 0.9 s with a 270 kW 28 GHz wave. A higher plasma current of 66 kA was also non-inductively achieved with a slow ramp-up of the vertical field. We have achieved a significantly higher plasma current than those achieved previously with the 2nd harmonic EC waves. This fully non-inductive 2nd harmonic EC plasma ramp-up method might be useful for future burning plasma devices and fusion reactors, in particular for operations at half magnetic field with the same EC heating equipment.

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U2 - 10.1088/1741-4326/aa7c20

DO - 10.1088/1741-4326/aa7c20

M3 - Article

AN - SCOPUS:85034421846

SN - 0029-5515

VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 12

M1 - 126045

ER -

Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

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