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

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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 languageEnglish
Article number003
Pages (from-to)709-713
Number of pages5
JournalNuclear Fusion
Volume46
Issue number7
DOIs
Publication statusPublished - 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. [003]. https://doi.org/10.1088/0029-5515/46/7/003