LIGO Document T0900103-v2

Hysteresis and pitch mode Q in the quad noise prototype and possible implications for thermal noise

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T - Technical notes
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In suspending and debugging the quad test mass suspension noise prototype at LASTI, Brett Shapiro discovered a significant amount of hysteresis in the pitch degree of freedom. This document describes some analysis that was done using the Mathematica quad suspension model by Mark Barton to try to match the measured mode Qs and thus find clues as to which element or elements in the suspension were hysteretic.
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Notes and Changes:
New bottom wire data, new diagram showing damping locations, more on Justin and Riccardo’s results

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