Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST

Saya Tashima; H. Zushi; M. Isobe; K. Hanada; H. Idei; K. Nakamura; A. Fujisawa; K. Matsuoka; M. Hasegawa; Y. Nagashima; S. Okamura; S. Banerjee; S. Kawasaki; H. Nakashima; A. Higashijima

doi:10.1088/0029-5515/54/2/023010

Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST

Saya Tashima, H. Zushi, M. Isobe, K. Hanada, H. Idei, K. Nakamura, A. Fujisawa, K. Matsuoka, M. Hasegawa, Y. Nagashima, S. Okamura, S. Banerjee, S. Kawasaki, H. Nakashima, A. Higashijima

Division of Nuclear Fusion Dynamics

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

26 Citations (Scopus)

Abstract

A scenario for non-inductive current ramp-up has been demonstrated using electron cyclotron waves in the spherical tokamak QUEST. The configuration was characterized by a high toroidal magnetic mirror ratio of 2 and a steady vertical magnetic field of more than 10% of the toroidal magnetic field. The generation and confinement of energetic electrons having energy greater than 10 keV were studied using hard x-rays. Because of the energetic electron pressure, a natural divertor formed with an inboard poloidal field null at the high poloidal beta (approximately 3-4).

Original language	English
Article number	023010
Journal	Nuclear Fusion
Volume	54
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/54/2/023010
Publication status	Published - Feb 1 2014

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Tashima, S., Zushi, H., Isobe, M., Hanada, K., Idei, H., Nakamura, K., Fujisawa, A., Matsuoka, K., Hasegawa, M., Nagashima, Y., Okamura, S., Banerjee, S., Kawasaki, S., Nakashima, H., & Higashijima, A. (2014). Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST. Nuclear Fusion, 54(2), [023010]. https://doi.org/10.1088/0029-5515/54/2/023010

Tashima, S, Zushi, H, Isobe, M, Hanada, K , Idei, H, Nakamura, K, Fujisawa, A, Matsuoka, K, Hasegawa, M , Nagashima, Y, Okamura, S, Banerjee, S, Kawasaki, S, Nakashima, H & Higashijima, A 2014, 'Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST', Nuclear Fusion, vol. 54, no. 2, 023010. https://doi.org/10.1088/0029-5515/54/2/023010

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abstract = "A scenario for non-inductive current ramp-up has been demonstrated using electron cyclotron waves in the spherical tokamak QUEST. The configuration was characterized by a high toroidal magnetic mirror ratio of 2 and a steady vertical magnetic field of more than 10% of the toroidal magnetic field. The generation and confinement of energetic electrons having energy greater than 10 keV were studied using hard x-rays. Because of the energetic electron pressure, a natural divertor formed with an inboard poloidal field null at the high poloidal beta (approximately 3-4).",

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AU - Tashima, Saya

AU - Zushi, H.

AU - Isobe, M.

AU - Hanada, K.

AU - Idei, H.

AU - Nakamura, K.

AU - Fujisawa, A.

AU - Matsuoka, K.

AU - Hasegawa, M.

AU - Nagashima, Y.

AU - Okamura, S.

AU - Banerjee, S.

AU - Kawasaki, S.

AU - Nakashima, H.

AU - Higashijima, A.

PY - 2014/2/1

Y1 - 2014/2/1

N2 - A scenario for non-inductive current ramp-up has been demonstrated using electron cyclotron waves in the spherical tokamak QUEST. The configuration was characterized by a high toroidal magnetic mirror ratio of 2 and a steady vertical magnetic field of more than 10% of the toroidal magnetic field. The generation and confinement of energetic electrons having energy greater than 10 keV were studied using hard x-rays. Because of the energetic electron pressure, a natural divertor formed with an inboard poloidal field null at the high poloidal beta (approximately 3-4).

AB - A scenario for non-inductive current ramp-up has been demonstrated using electron cyclotron waves in the spherical tokamak QUEST. The configuration was characterized by a high toroidal magnetic mirror ratio of 2 and a steady vertical magnetic field of more than 10% of the toroidal magnetic field. The generation and confinement of energetic electrons having energy greater than 10 keV were studied using hard x-rays. Because of the energetic electron pressure, a natural divertor formed with an inboard poloidal field null at the high poloidal beta (approximately 3-4).

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Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST

Abstract

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