Evan, Rob

During a low noise lock last week we took some spectra to look for test mass mode frequencies. The test mass drumhead modes are clearly visible in the cross-power spectrum of the IOP channels of the DCPDs. The frequencies are at 8158.07, 8160.41, 8160.92, and 8162.68 Hz. These differ from the (modeled) values in the table in entry 20513 by ~0.5%.  We haven't yet worked out which frequency corresponds to which test mass.

The xml filename is in the screenshot.