Microphonics Testing of the FEL03 Cryomodule
A 446 Hz peak is well isolated from adjacent peaks in the plot for cavity #1, so that the Q of the mode can be estimated to be 149. ... Similar tests on SNS cavities have shown that the two methods yield similar shapes, with the Lorentz method dynamic range about 10dB less in dynamic range. ... Power line harmonics were evident, as was 32.5 Hz ... ................
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