John Worden, R. Weiss Vibration measurements of the beamtube with the new R10 insulation and aluminum jacket were made and described in the appended document. The new insulation reduces the acoustic coupling to the beamtube but not as well as the initial insulation. The data enables a more detailed estimate of the phase noise from the beamtube motion due to the faulty HR coatings of the new test mass mirrors. The DCC number of the document is T1400384.
Error in the document. Please see T1400384-v2 or LHO log entry 12232