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Suspension Thermal noise for CLIO 081105
fo = 0.7 Hz, Q = 1e+5 and by assuming of structure damping
- Wire specification
- suspension wire: bolfur, 50 micron diameter, 400 mm length, 2 loops.
- mass: sapphire, 100 mm diameter, 60mm length, 1.8kg.
- Q of Violin mode
- f1=699.05Hz, Q=1.0*10^5
- f2=700.29Hz, Q=0.63*10^5
http://gw.icrr.u-tokyo.ac.jp:8888/clio_blog/2008/11/06/Graph_sens_081106_violin.pdf
- Extrapolation to pendulum mode Q
violin mode Q と pendulum Q の間には 1:2 or 1:4 の関係があるそうです。 (pending)
- Expectation of pendulum mode Q
- みよきさんによるボルファ単体の Q は 1000。 計算によるdissipation dilution factorは1.2*10^-4. これらを組み合わせると、期待されるQ=1*10^7.