This weekend, as part of clipping investigations, I found that I could adjust the pointing of the PSL piezo mirror to minimize the jitter peaks in IMC-REFL_DC ( pitch: 1846 to 2300, yaw: 2043 to 1500) with the IMC off. The figure shows the resulting reduction of peaks in REFL_DC. Shaking of HAM2 was used to enhance some of the peaks, but there was little shaking at the 280 Hz piezo mirror peak. Sheila and I tried to move the piezo mirror to these settings while keeping the IMC locked but we were unsuccessful. It might be worth adjusting the beam on the diode while trying to minimize peaks.

Robert, Sheila