Mechanical quality factor of a sapphire fiber at cryogenic temperatures

A mechanical quality factor of $1.1 \times 10^{7}$ was obtained for the 199 Hz bending vibrational mode in a monocrystalline sapphire fiber at 6 K. Consequently, we confirm that pendulum thermal noise of cryogenic mirrors used for gravitational wave detectors can be reduced by the sapphire fiber suspension.Comment: To be published to Physiscs Letters A. Number of pages: 10 Number of figures: 5 Number of tables:

中心体タンパク質Cep169の一次繊毛形成制御機構の研究

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 大杉 美穂, 東京大学教授 秋山 徹, 東京大学教授 飯野 雄一, 東京大学教授 多羽田 哲也, 早稲田大学教授 寺田 泰比古University of Tokyo(東京大学

MCPH1 regulates chromosome condensation and shaping as a composite modulator of condensin II

MCPH1, a protein linked to primary microcephaly, directly modulates condensin II to regulate chromosome condensation and shape

Force measurements of a superconducting-film actuator for a cryogenic interferometric gravitational-wave detector

We measured forces applied by an actuator with a YBCO film at near 77 K for the Large-scale Cryogenic Gravitational-wave Telescope (LCGT) project. An actuator consisting of both a YBCO film of 1.6 micrometers thickness and 0.81 square centimeters area and a solenoid coil exerted a force of up to 0.2 mN on a test mass. The presented actuator system can be used to displace the mirror of LCGT for fringe lock of the interferometer.Comment: 9 pages, 3 figure