Last Friday Maddalena performed some noise injections on INJ_IB_tx,ty,tz degrees of freedom.
| DOF | GPS start | duration |
| INJ_IB_tx | 1213697970 | 30s |
| INJ_IB_ty | 1213698395 | 30s |
| INJ_IB_tz | 1213647570 | 30s |
The first figure shows the FFTs of the signals, calculated during the injections (blue lines), and during two calm periods: one with the ITF locked in LN3 (GPS 1213647570, red line), the other with the INJ in standalone (GPS 1213243220, yellow line).
The second figure shows in the first row the FFT of each DOF, in the second row the corresponding coherence with DARM.
The table below summarizes the frequencies of the most excited peaks during the injection, and the ones showing coherence with DARM are reported in bold.
| list of the most excited peaks (look at fig.2) | |
| INJ_IB_tx | 29.3 Hz, 62.26 Hz, 76.9 Hz, 86.67 Hz, 101.3 Hz |
| INJ_IB_ty | 28.08 Hz, 62.26 Hz, 76.9 Hz, 87.89 Hz, 101.3 Hz, 136.7 Hz, 157.5 Hz, 166 Hz, 170.9 Hz |
| INJ_IB_tz | 29.3 Hz, 39.06 Hz, 62.26 Hz, 76.9 Hz, 87.89 Hz, 101.3 Hz, 136.7 Hz, 157.5 Hz, 183.1 Hz, 200.2 Hz, 212.4 Hz, 219.7 Hz |
ty shows coherence with DARM at 106,2, 157.5 Hz and tz at 106.2 and 158.7 Hz when no injection is performed. However, it is difficult to conclude since we do not know the coupling mechanism to DARM (it could couple as frequency noise rather than angular noise)
