H-mode Operation in Helium Plasma with Tungsten Divertor and Low Input Torque in EAST

To support the ITER early non-nuclear operational phase, recent Helium experiments have been investigated intensively in the superconducting tokamak EAST equipped with ITER-like Tungsten divertor, under the condition of low injected torque. This paper demonstrates experimental observations from these experiments. In particular, we report the impact of Helium concentration on the L-H transition power threshold, energy confinement, and the ELM behavior as well. Dependences of L-H threshold on electron density, plasma current and magnetic field are also discussed.

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