The First Plasma Rotation Measurement in a Large Reversed-Field Pinch Device, TPE-RX

The plasma rotation velocities in both toroidal and poloidal directions are measured by the Doppler shift of the impurity spectral line in a new large reversed-field pinch device, TPE-RX. It is found that the magnitude of the toroidal rotation velocities varies with the plasma current. The poloidal rotation velocities are almost zero in the plasma current region studied here. The radial electric field around the plasma edge region varies with the plasma current under some assumptions. This behavior is discussed in relation to both the finite Larmor radius effect and the magnetic field line stochasticity.