This week, isolation loops have been closed on the ISI – BSC8 in the LVEA. The 12 isolation filters have been designed using one set of measurements (ISI undamped) and respecting the following criteria (Phase margin>45deg – Gain margin>20dB - Blend frequency (.75Hz) - UUG:15Hz). Blend filters used for this test are really basic (low order). Some work is ongoing on these filters.

 I have attached some powerspectra (Stage 2 GS13 in the Cartesian basis) with and without control.