LIGO Document T1200418-v4

LLO MC2 Violin Mode Q

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Document type:
T - Technical notes
Other Versions:
22 Apr 2013, 14:01
28 Aug 2012, 14:13
This is a writeup of a quick calculation to understand the measured violin mode Q of the MC2 suspension at LLO but is applicable to all HSTS. The interesting conclusion is that the violin mode Q is dominated by thermoelastic damping which has its peak nearby.
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Notes and Changes:
Various refinements suggested by Jeff K, including a calculation of net thermal noise. Incorporate refitted Qs from LLO alog 5280.

v4: Corrected typo error in equation (1.8) in docx and pdf files (radius has been replaced by diameter). This does not affect results. (Norna, 9th August 2014)

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