Development of low temperature 2-axes goniometer system for single crystal ToF Laue diffractometer SENJU

単結晶ToFラウエ回折計SENJUにおける低温駆動2軸ゴニオメーターの開発

金子 耕士   ; 宗像 孝司*; 土肥 優紀*; 野田 幸男; 花島 隆泰*; 佐藤 薫*; 川崎 卓郎   ; 鬼柳 亮嗣  ; 中尾 朗子*; 大原 高志   ; 及川 健一   ; 田村 格良  

Kaneko, Koji; Munakata, Koji*; Dohi, Yuki*; Noda, Yukio; Hanashima, Takayasu*; Sato, Kaoru*; Kawasaki, Takuro; Kiyanagi, Ryoji; Nakao, Akiko*; Ohara, Takashi; Oikawa, Kenichi; Tamura, Itaru

Recent technical development in piezo devices offers a possibility to move a crystal even at dilution temperature. We tried to develop a piezo-based goniometer in time with the construction of single crystal time-of-flight neutron Laue diffractometer SENJU at BL18 of J-PARC. The goniometer consists of two rotatable axes and with fixed- (45)to cover entire reciprocal space. A goniometer is directly mounted onto the cold finger of the standard closed-circle refrigerator. So far, sample rotation can be realised at base temperature of 4.4 K with reasonable cooling time of roughly 5 hours. In fact, several low temperature experiments using this goniometer have been worked out. Further efforts to improve base temperature, cooling time and accuracy of movements are in progress.