@misc{oai:repo.qst.go.jp:00079213,
 author = {Imazawa, Ryota and Ono, Takehiro and Watts, Christopher and Ishikawa, Masao and Shimada, Takahiko and Itami, Kiyoshi and Hatae, Takaki and Imazawa, Ryota and Ono, Takehiro and Ishikawa, Masao and Shimada, Takahiko and Itami, Kiyoshi and Hatae, Takaki},
 month = {Sep},
 note = {A poloidal polarimeter system will be installed in ITER to identify the safety factor profile in the plasma core region by measuring polarization change of a probing laser beam passing through plasma. Far-infrared laser beam, injected in a plasma, is reflected by a corner-cube retro-reflector mounted on first wall panels and returns to a diagnostic room. Although the corner-cube retro-reflectors will be exposed to high neutron and radiation fluxes, they will be passively cooled by heat conduction to the first wall panels. The challenging of designing the corner-cube retro-reflector is (1) cooling capability and (2) difference of thermal expansion of different materials. The first wall panel is made of stainless steel, while the corner-cube retro-reflectors is made of tungsten because of high resistivity to plasma sputtering. A special adapter is necessary for tightly fixing tungsten retro-reflectors and strongly touching the stainless-steel wall (the first wall panel) for the sake of high thermal conduction. However, the coefficient of thermal expansion of tungsten and stainless steel is different by a factor of four. It is difficult to touch both the tungsten retro-reflectors and stainless-steel wall with high contact pressure. The authors developed new adapter design consisting of two parts. One part takes care of fixing the position of tungsten retro-reflectors and the other part takes care of good thermal conduction. Thermal and structural analysis results show that the new design can meet the design criteria of ductile damage, plastic damage and thermal creep. A prototype of the new design is under fabrication to demonstrate the manufacturability., 14th International Symposium on Fusion Nuclear Technology (ISFNT)},
 title = {Thermal and structural analyses of retro-reflectors of ITER poloidal polarimeter that are mounted in first wall panels},
 year = {2019}
}