Spectroscopic measurements of plasma rotation with parametric Abel inversion in the GAMMA10 tandem mirror

The rotation of cylindrical plasmas has been investigated using visible spectroscopy. The rotations of variously charged impurity ions have been measured. Since the detected signal is the line integrated emission, the measurement technique of plasma rotation and the parametric Abel inversion technique have been developed to obtain the local impurity emission profile and the potential profile. Three different types of fitting functions for the parametric Abel inversion technique have been examined using numerical simulations. The following significant observations are made: (a) the radial profiles of the electrostatic potential obtained from rotations of various ions are identical, (b) the Doppler shift profile due to diamagnetic rotation is different for the different ion species. This is the first clear experimental observation of diamagnetic drift in high temperature plasmas.

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