RF start-up and sustainment experiments on the TST-2@K spherical tokamak

A. Ejiri; Y. Takase; H. Kasahara; T. Yamada; K. Hanada; K. N. Sato; H. Zushi; K. Nakamura; M. Sakamoto; H. Idei; M. Hasegawa; A. Iyomasa; N. Imamura; K. Esaki; M. Kitaguchi; K. Sasaki; H. Hoshika; O. Mitarai; N. Nishino

doi:10.1088/0029-5515/46/7/003

RF start-up and sustainment experiments on the TST-2@K spherical tokamak

A. Ejiri, Y. Takase, H. Kasahara, T. Yamada, K. Hanada, K. N. Sato, H. Zushi, K. Nakamura, M. Sakamoto, H. Idei, M. Hasegawa, A. Iyomasa, N. Imamura, K. Esaki, M. Kitaguchi, K. Sasaki, H. Hoshika, O. Mitarai, N. Nishino

Division of Nuclear Fusion Dynamics

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Abstract

Plasma start-up and sustainment without an inductive field have been studied in the TST-2@K spherical tokamak using high power RF sources (8.2 GHz/up to 170 kW). Steady state discharges with a plasma current of 4 kA were achieved. The line integrated density was about 3 × 10¹⁷ m ^-2 and the electron temperature was 160 eV. A truncated equilibrium was introduced to reproduce magnetic measurements. It was found that a positive Pfirsch-Schlüter current in the open field line region at the outboard boundary makes a significant contribution to the current. Insensitivity of the current to variations in the vertical field and RF power variation was also found.

Original language	English
Article number	003
Pages (from-to)	709-713
Number of pages	5
Journal	Nuclear Fusion
Volume	46
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/46/7/003
Publication status	Published - Jul 1 2006

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Ejiri, A., Takase, Y., Kasahara, H., Yamada, T., Hanada, K., Sato, K. N., Zushi, H., Nakamura, K., Sakamoto, M., Idei, H., Hasegawa, M., Iyomasa, A., Imamura, N., Esaki, K., Kitaguchi, M., Sasaki, K., Hoshika, H., Mitarai, O., & Nishino, N. (2006). RF start-up and sustainment experiments on the TST-2@K spherical tokamak. Nuclear Fusion, 46(7), 709-713. Article 003. https://doi.org/10.1088/0029-5515/46/7/003

Ejiri, A, Takase, Y, Kasahara, H, Yamada, T , Hanada, K, Sato, KN, Zushi, H, Nakamura, K, Sakamoto, M, Idei, H , Hasegawa, M, Iyomasa, A, Imamura, N, Esaki, K, Kitaguchi, M, Sasaki, K, Hoshika, H, Mitarai, O & Nishino, N 2006, 'RF start-up and sustainment experiments on the TST-2@K spherical tokamak', Nuclear Fusion, vol. 46, no. 7, 003, pp. 709-713. https://doi.org/10.1088/0029-5515/46/7/003

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title = "RF start-up and sustainment experiments on the TST-2@K spherical tokamak",

abstract = "Plasma start-up and sustainment without an inductive field have been studied in the TST-2@K spherical tokamak using high power RF sources (8.2 GHz/up to 170 kW). Steady state discharges with a plasma current of 4 kA were achieved. The line integrated density was about 3 × 1017 m -2 and the electron temperature was 160 eV. A truncated equilibrium was introduced to reproduce magnetic measurements. It was found that a positive Pfirsch-Schl{\"u}ter current in the open field line region at the outboard boundary makes a significant contribution to the current. Insensitivity of the current to variations in the vertical field and RF power variation was also found.",

author = "A. Ejiri and Y. Takase and H. Kasahara and T. Yamada and K. Hanada and Sato, {K. N.} and H. Zushi and K. Nakamura and M. Sakamoto and H. Idei and M. Hasegawa and A. Iyomasa and N. Imamura and K. Esaki and M. Kitaguchi and K. Sasaki and H. Hoshika and O. Mitarai and N. Nishino",

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doi = "10.1088/0029-5515/46/7/003",

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T1 - RF start-up and sustainment experiments on the TST-2@K spherical tokamak

AU - Ejiri, A.

AU - Takase, Y.

AU - Kasahara, H.

AU - Yamada, T.

AU - Hanada, K.

AU - Sato, K. N.

AU - Zushi, H.

AU - Nakamura, K.

AU - Sakamoto, M.

AU - Idei, H.

AU - Hasegawa, M.

AU - Iyomasa, A.

AU - Imamura, N.

AU - Esaki, K.

AU - Kitaguchi, M.

AU - Sasaki, K.

AU - Hoshika, H.

AU - Mitarai, O.

AU - Nishino, N.

PY - 2006/7/1

Y1 - 2006/7/1

N2 - Plasma start-up and sustainment without an inductive field have been studied in the TST-2@K spherical tokamak using high power RF sources (8.2 GHz/up to 170 kW). Steady state discharges with a plasma current of 4 kA were achieved. The line integrated density was about 3 × 1017 m -2 and the electron temperature was 160 eV. A truncated equilibrium was introduced to reproduce magnetic measurements. It was found that a positive Pfirsch-Schlüter current in the open field line region at the outboard boundary makes a significant contribution to the current. Insensitivity of the current to variations in the vertical field and RF power variation was also found.

AB - Plasma start-up and sustainment without an inductive field have been studied in the TST-2@K spherical tokamak using high power RF sources (8.2 GHz/up to 170 kW). Steady state discharges with a plasma current of 4 kA were achieved. The line integrated density was about 3 × 1017 m -2 and the electron temperature was 160 eV. A truncated equilibrium was introduced to reproduce magnetic measurements. It was found that a positive Pfirsch-Schlüter current in the open field line region at the outboard boundary makes a significant contribution to the current. Insensitivity of the current to variations in the vertical field and RF power variation was also found.

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SN - 0029-5515

VL - 46

SP - 709

EP - 713

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 7

M1 - 003

ER -

RF start-up and sustainment experiments on the TST-2@K spherical tokamak

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