aLIGO LHO Logbook

Peaks in DARM between 20 and 40 Hz

The bump of noise in DARM around 30 Hz is mostly a forest of peaks. One of them (33.43 Hz) is actually a calibration line. For the others, I looked at coherence with corner suspension optical levers and witness sensors. Some of the peaks shos enough coherence to indicate that maybe the peak is due to motion of that suspension

Frequency Suspension
25.19   
26.53   BS / PR3
27.04   BS / PR3 / SR3
27.42  
27.50   
27.72   
28.22   
29.50   PR3 / SR3
29.97   PR3
32.31   
33.33   
33.43   
35.22   PR2
35.71   
39.80   PR3 SR3

Here's a full table of coherence

	25.19	26.53	27.04	27.42	27.50	27.72	28.22	29.50	29.97	32.31	33.33	33.43	35.22	35.71	39.80
H1:SUS-BS_M3_OPLEV_PIT_OUT_DQ	0.019	0.231	0.290	0.008	0.009	0.001	0.003	0.164	0.003	0.028	0.008	0.039	0.123	0.020	0.024
H1:SUS-BS_M3_OPLEV_YAW_OUT_DQ	0.004	0.201	0.304	0.007	0.003	0.003	0.040	0.138	0.022	0.018	0.008	0.012	0.182	0.047	0.118
H1:SUS-PRM_M3_WIT_P_DQ	0.003	0.013	0.020	0.003	0.024	0.001	0.013	0.121	0.042	0.005	0.001	0.001	0.040	0.107	0.001
H1:SUS-PRM_M3_WIT_Y_DQ	0.003	0.017	0.002	0.008	0.014	0.021	0.049	0.001	0.008	0.016	0.033	0.021	0.009	0.007	0.006
H1:SUS-PR2_M3_WIT_P_DQ	0.001	0.002	0.032	0.002	0.021	0.031	0.023	0.013	0.041	0.023	0.013	0.011	0.010	0.013	0.043
H1:SUS-PR2_M3_WIT_Y_DQ	0.004	0.014	0.054	0.006	0.035	0.023	0.005	0.045	0.074	0.002	0.005	0.004	0.020	0.093	0.005
H1:SUS-PR3_M3_OPLEV_PIT_OUT_DQ	0.023	0.257	0.297	0.003	0.033	0.007	0.005	0.166	0.017	0.031	0.001	0.004	0.188	0.007	0.165
H1:SUS-PR3_M3_OPLEV_YAW_OUT_DQ	0.002	0.258	0.297	0.003	0.059	0.005	0.002	0.163	0.005	0.016	0.004	0.002	0.171	0.038	0.109
H1:SUS-PR3_M3_WIT_P_DQ	0.026	0.051	0.005	0.022	0.017	0.035	0.025	0.065	0.365	0.005	0.001	0.028	0.070	0.039	0.021
H1:SUS-PR3_M3_WIT_Y_DQ	0.064	0.072	0.030	0.000	0.020	0.001	0.000	0.052	0.772	0.036	0.079	0.042	0.001	0.353	0.005
H1:SUS-SRM_M3_WIT_P_DQ	0.028	0.049	0.034	0.002	0.001	0.008	0.024	0.049	0.006	0.009	0.011	0.028	0.016	0.001	0.034
H1:SUS-SRM_M3_WIT_Y_DQ	0.006	0.029	0.015	0.059	0.011	0.020	0.022	0.015	0.006	0.029	0.046	0.007	0.003	0.001	0.020
H1:SUS-SR2_M3_WIT_P_DQ	0.004	0.002	0.008	0.006	0.014	0.005	0.054	0.013	0.540	0.008	0.001	0.014	0.012	0.121	0.008
H1:SUS-SR2_M3_WIT_Y_DQ	0.013	0.008	0.039	0.029	0.028	0.010	0.010	0.003	0.521	0.004	0.008	0.003	0.068	0.153	0.008
H1:SUS-SR3_M3_OPLEV_PIT_OUT_DQ	0.014	0.165	0.287	0.006	0.030	0.001	0.001	0.169	0.012	0.009	0.012	0.012	0.145	0.008	0.079
H1:SUS-SR3_M3_OPLEV_YAW_OUT_DQ	0.029	0.133	0.290	0.007	0.040	0.003	0.001	0.173	0.013	0.010	0.008	0.005	0.020	0.006	0.175
H1:SUS-SR3_M3_WIT_P_DQ	0.007	0.002	0.002	0.013	0.011	0.017	0.015	0.046	0.005	0.026	0.007	0.028	0.008	0.068	0.011
H1:SUS-SR3_M3_WIT_Y_DQ	0.092	0.005	0.023	0.014	0.000	0.010	0.021	0.022	0.003	0.000	0.007	0.009	0.008	0.013	0.022
H1:SUS-MC1_M3_WIT_P_DQ	0.031	0.032	0.016	0.005	0.012	0.025	0.003	0.020	0.658	0.003	0.006	0.001	0.042	0.125	0.015
H1:SUS-MC1_M3_WIT_Y_DQ	0.004	0.000	0.009	0.013	0.014	0.004	0.057	0.111	0.124	0.017	0.020	0.012	0.047	0.034	0.041
H1:SUS-MC2_M3_WIT_P_DQ	0.012	0.044	0.016	0.005	0.004	0.016	0.011	0.008	0.061	0.002	0.015	0.028	0.039	0.005	0.036
H1:SUS-MC2_M3_WIT_Y_DQ	0.005	0.009	0.003	0.006	0.024	0.012	0.002	0.012	0.082	0.032	0.058	0.034	0.037	0.029	0.041
H1:SUS-MC3_M3_WIT_P_DQ	0.010	0.014	0.039	0.015	0.025	0.043	0.032	0.008	0.015	0.003	0.003	0.009	0.008	0.018	0.003
H1:SUS-MC3_M3_WIT_Y_DQ	0.003	0.047	0.044	0.009	0.043	0.024	0.004	0.095	0.006	0.049	0.004	0.027	0.015	0.008	0.001