Abstract
One of the hypotheses for the cause of the locked mode in reversed-field pinch (RFP) plasmas is examined using a large RFP machine, TPE-RX. A hypothetical model was proposed [Phys. Plasmas 6 (1999) 3824], which speculates that the halo current in the vacuum vessel might be the cause of the locked mode. We directly measured the toroidal distribution of the vessel current and correlated it with the position and the magnitude of the locked mode. The vessel current is found to flow into the contact point of the last closed flux surface where the locked mode exists. Magnitude of the vessel current is much smaller than the level expected to form the locked mode. From these observations, we conclude that this vessel current is a result of the local shift of the plasma column due to the locked mode, and may not be the cause of the locked mode.
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