In this conference, we will report about new EUV research activity in Kyushu-Univ. in Japan. We have been planning EUV Exposure Research Center for support material development (Fig.1) and also new high power EUV source investigation program has been on going. It’s trigger is donation of 30kW CO2 driver laser system from Gigaphoton Inc. in 2022. Also In this paper we will discuss about the Sn plasma dynamics which dominate the EUV emission by using Thomson Scattering (TS) measurement4)(Fig.3). Recent TS results have revealed whole profiles of electron temperature and ion density in the EUV sources. These results mention that there is still sufficient potential to increase EUV output power and conversion efficiency in near future. This conceptual investing encourage us to improve EUV Light Source performance.
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