Initial results from the TST-2 spherical tokamak

Y. Takase, A. Ejiri, N. Kasuya, T. Mashiko, S. Shiraiwa, L. M. Tozawa, T. Akiduki, H. Kasahara, Y. Nagashima, H. Nozato, H. Wada, H. Yamada, T. Yamada, K. Yamagishi

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)


A new spherical tokamak, TST-2, was constructed at the University of Tokyo and started operation in September 1999. Reliable plasma initiation is achieved with typically 1 kW of ECH power at 2.45 GHz. Plasma currents of up to 90 kA and toroidal fields of up to 0.2 T have been achieved during the initial experimental campaign. The ion temperature is typically 100 eV. Internal reconnection events are often observed. The internal magnetic field measured at r/a = 2/3 indicated growth of fluctuations up to the fourth harmonic, suggesting the existence of modes with several different mode numbers. In the presence of a toroidal field and a vertical field with positive curvature, non-inductively driven currents of the order of 1 kA were observed with 1 kW of ECH power. The driven current increased with decreasing filling pressure, down to 4 × 10-4 Pa. A study of high harmonic fast wave excitation and propagation has begun. Initial results indicate highly efficient wave launching. The spatial distribution of the RF magnetic field was qualitatively consistent with the result of a full-wave calculation.

Original languageEnglish
Pages (from-to)1543-1550
Number of pages8
JournalNuclear Fusion
Issue number11
Publication statusPublished - Nov 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


Dive into the research topics of 'Initial results from the TST-2 spherical tokamak'. Together they form a unique fingerprint.

Cite this