## page was renamed from CLIO/NoiseBudgets/SuspensionThermalNoise
## page was renamed from CLIO/Technicals/SuspensionThermalNoise
## page was renamed from CLIO/data/SuspensionThermalNoise
= Suspension Thermal noise for CLIO 081105 =

 [[attachment:sus_thermal.txt]]

 <<BR>>'''
 T = 300 K,
 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 thickness, 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]]
'''
<<BR>>

 * 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.