月別アーカイブ: 2016年10月

Interpreting the double-ridge structure in high-frequency time-distance diagrams / Close loop correction of residual atmospheric dispersion in high-contrast imaging systems

[Speaker1]
Nagaaki Kambara, M2 , Sokendai, Mitaka (supervisor : Takashi Sekii, Tetsuya Watanabe, Masahito Kubo)

[Title]
Interpreting the double-ridge structure in high-frequency time-distance diagrams

[Speaker2]
Prashant Pathak, D3, Sokendai, Hawaii (supervisor : Prof. Hideki Takami)

[Title]
Close loop correction of residual atmospheric dispersion in high-contrast imaging systems

[Abstract]
For direct imaging of habitable exoplanets from ground-based telescopes, it is crucial to correct for all the wavefront errors. One such error comes atmospheric refraction, in this talk, I will talk about why it is important to correct for refraction to the highest degree and how it can be achieved.

Control Strategy of Vibration Isolation System in KAGRA / Chemical composition in merging galaxy NGC3256

[Speaker1]
Koki Okutomi ,SOKENDAI, D2 (Supervisor; Yoichi Aso)
[Title]
Control Strategy of Vibration Isolation System in KAGRA
[Abstract]
Laser interferometric gravitational-wave detector KAGRA has vibration isolation systems called SAS which attenuate fluctuation of mirrors from seismic disturbance. The largest type of SAS is a multi-stage pendulum consists of 9 suspended stages. We need to control the mirror with the complicated system to operate the laser interferometer. In this talk, I present a strategy how to control the SAS and measurements for a sensor/actuator unit related to the control strategy.

[Speaker2]
Tomonari Michiyama ,SOKENDAI, D1 (Supervisor; Daisuke Iono)
[Title]
Chemical composition in merging galaxy NGC3256