Features Of The Electron-Temperature Distribution In A Low-Aspect-Ratio Reversed Field Pinch Plasmas

The features of the two-dimensional (2D) line-averaged electron-temperature (T-e) distribution in low-aspect-ratio (low-A) reversed field pinch (RFP) plasmas are reported. We successfully obtain the time evolution of line-averaged T-e images in a low-A RFP plasma with a soft X-ray (SXR) camera with two pin-holes for two-kinds of absorber foils in cojunction with a high-speed camera. Our obtained line-averaged T-e is positively correlated with plasma current (I-p), and data are consistent with core and edge T-e obtained by other methods. In multi helicity (MH) discharge, up-down symmetry is not changed as time goes by. On the other hand, tilting of the high temperature region is observed quasi-periodically in quasi-single helicity (QSH) discharge, with a steeper T-e gradient appearing during the QSH state.