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Angular Noises in BRT Requirement Analysis for HARD and SOFT Modes

This study by Junko Katayama from NAOJ and Ochanomizu University in 2014 focuses on noise analysis in the BRT system. The lateral noises were from seismic spectrum, and angular noises were estimated by surface waves. The study aims to confirm that angular noises caused by lateral motion are not dominant and to extract HARD and SOFT mode signals by suspending BRT.

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Angular Noises in BRT Requirement Analysis for HARD and SOFT Modes

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  1. Noises and RequirementBRT Junko Katayama NAOJ / Ochanomizu University 2014/5/21

  2. Red line is requirement • “1” means noise on QPD1, “2” on QPD2 • lateral noises were from seismic spectrum • Angular ones were estimated by surface wave • Ones caused by lateral motion seem to be not dominant (but not checked strictly yet)

  3. SOFT Noise and Requirement

  4. HARD Noise and Requirement

  5. Conclusion • I will check that the angular noises caused by lateral motion are surely not dominant. • We can get HARD mode signal. • We may be able to get SOFT mode signal if we susped BRT.

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