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Tomographic Analysis of Central MHD Activities and Radiation Losses on the HL-2A and LHD

Results of the two-dimensionally reconstructed distribution of soft X-ray emission in HL-2A and electromagnetic radiation in large helical device (LHD) are presented. Hardware improvements of in-vessel soft X-ray cameras and the development of tomographic software have made detailed and visual studies of soft X-ray emission possible in HL-2A. Several algorithms are employed in order to get as detail as possible in the images while keeping the guiding assumptions to a minimum. Recently success has been achieved in applying a 2D peeling away algorithm for tomographic reconstruction of LHD bolometric data jointly under the China-Japan collaboration. The data analysed so far have been used to study magnetohydrodynamic (MHD) instabilities on HL-2A tokamak and radiation losses on LHD.