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Generation of initial closed flux surfaces by ech at a conventional aspect ratio of r / a 3: experiments on the late device and jt-60u tokamak

Uchida, M. ; Maekawa, T. ; Tanaka, H. ; Ide, S. ; Takase, Y. ; Watanabe, F. ; Nishi, S.

Nuclear Fusion, 2011, Vol.51(6), p.063031 (9pp) [Periódico revisado por pares]

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  • Título:
    Generation of initial closed flux surfaces by ech at a conventional aspect ratio of r / a 3: experiments on the late device and jt-60u tokamak
  • Autor: Uchida, M. ; Maekawa, T. ; Tanaka, H. ; Ide, S. ; Takase, Y. ; Watanabe, F. ; Nishi, S.
  • Assuntos: Physics
  • É parte de: Nuclear Fusion, 2011, Vol.51(6), p.063031 (9pp)
  • Descrição: Generation of initial closed flux surfaces by electron cyclotron heating (ECH) at a conventional aspect ratio of R / a 3 is investigated on the Low Aspect ratio Torus Experiment (LATE) device and further tested on the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) tokamak. In both experiments, a plasma current is initiated and increased by ECH under steady external fields composed of a toroidal field and a weak vertical field. In the LATE experiments, a movable inboard limiter is used to change the aspect ratio of plasmas up to R / a 3. The results show that the formation of closed flux surfaces is still possible up to R / a 3 while higher decay indices of vertical field are required as the aspect ratio increases. Similar current start-up discharges are performed on JT-60U, and a plasma current is initiated and increased up to 20kA under a vertical field having a high decay index.
  • Idioma: Inglês

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