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박형민,채종철,송동욱,양희수,장비호,박영득,나자경,조경석,안광수,Park, Hyungmin,Chae, Jongchul,Song, Donguk,Yang, Heesu,Jang, Bi-Ho,Park, Young-Deuk,Nah, Jakyoung,Cho, Kyung-Suk,Ahn, Kwangsu 한국천문학회 2012 天文學會報 Vol.37 No.2
For the study of fine-scale structure and dynamics in the solar chromosphere, the Fast Imaging Solar Spectrograph (FISS) was installed in 1.6m New Solar Telescope at Big Bear Solar Observatory in 2010. The instrument, installed at a vertical table of the Coude lab, is properly working and producing data for science. From the analysis of the data, however, we noticed that a couple of problems exist that deteriorate image quality : lower light level and poorer resolution of the CaII band data. After several tests, we found that the relay optics at the right position is crucial role for the spatial resolution of raster-scan images. By using resolution target, we re-aligned relay optics and other components of the spectrograph. Here we present the result of optical test and new data taken by the FISS.