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

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

29 Scopus citations

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 (US)
Article number	023010
Journal	Nuclear Fusion
Volume	54
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/54/2/023010
State	Published - Feb 1 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

Keywords

energetic electron
non-inductive current drive
spherical tokamak

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10.1088/0029-5515/54/2/023010

Cite this

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), Article 023010. https://doi.org/10.1088/0029-5515/54/2/023010

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

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).",

keywords = "energetic electron, non-inductive current drive, spherical tokamak",

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

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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, vol. 54, no. 2, 023010. https://doi.org/10.1088/0029-5515/54/2/023010

TY - JOUR

T1 - Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST

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).

KW - energetic electron

KW - non-inductive current drive

KW - spherical tokamak

UR - https://www.scopus.com/pages/publications/84893463899

UR - https://www.scopus.com/pages/publications/84893463899#tab=citedBy

U2 - 10.1088/0029-5515/54/2/023010

DO - 10.1088/0029-5515/54/2/023010

M3 - Article

AN - SCOPUS:84893463899

SN - 0029-5515

VL - 54

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 2

M1 - 023010

ER -

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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