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The Recent Experimental Results in the TU-Heliac

Alternating axial plasma current effects on heliac plasma equilibrium are reported. This plasma current can rewind a magretic line of force in the direction of increasing or decreasing rotational transform. These experiments are performed in plasma sustained only by low frequency (a 1 a"i, a.r"1: ion cyclotron frequency) ohmic heating, and a stable plasma can be produced in the magretic well configuration case. However, in the magnetic hill configuration the plasma current crashes as it increases. Furthermore this crash occurs only when the plasma current flows along the co direction to the toroidal field, of which direction corresponds to the direction of decreasing rotational transform. In this current crash case a low frequency oscillation is also observed in ion saturation current signals. This oscillation strongly depends on the plasma current and the magnetic field strength.