Design study of the divertor Thomson scattering system for JT-60SA

JT-60SAのためのダイバータトムソン散乱システムの設計検討

梶田 信*; 波多江 仰紀; 伊丹 潔; 大野 哲靖*; 仲野 友英

Kajita, Shin*; Hatae, Takaki; Itami, Kiyoshi; Ono, Noriyasu*; Nakano, Tomohide

Feasibility study of the divertor Thomson scattering measurement system for JT-60SA is carried out. A case study of different optical configuration reveals that both laser transmission optics and collection optical system are to be embedded in the lower narrow port plug. From the perspective of the laser induced damage threshold, the size and the material for the laser transmission mirror are assessed. Moreover, the performance of the detection system with using polychromator is investigated by use of numerical method, and the transmission wavelength ranges of optical filters are optimized. It is shown that four detector channels are at least necessary for the polychromator, and the measurement accuracy becomes best when the detector channel is six.