J. Kissel, O. Patane

2025-08-21 15:34 UTC    Ramped over from using OSEM-only to using GS13 Y Estimator and "light" OSEM damping. 
2025-08-21 16:05 UTC    Turned OFF yaw estimator (back to ), turned ON P estimator. 
2025-08-21 16:36 UTC    Turned ON yaw estimator, P estimator remains ON. Woo!
2025-08-21 16:50 UTC    Both estimators turned OFF (and immediately, calibration measurements start)

- IFO reached nominal low noise at 14:10 UTC (so IFO is ~1.25 hours into thermalization, which we typically quote to be 3.0 hours "done" [not 1/e time constant])
- EQ band is low at 0.02 [um/s]_RMS (most recent EQ was 4.5 [hr] ago; 5.8 [mag] just north of Japan)
- uSeism band is medium (for LHO summer) at 0.1 [um/s]_RMS
- Wind is less than 5-10 [mph]

2025-07-01 These are in use are after the M1 OSEMs have had their satamps upgraded (LHO:85463, 
2025-07-14 The upgraded satamp response was perfectly compensated with measured z:p's from testing in the EE lab LHO:85746)
2025-07-29 These are in use after the M1 OSEMs have had their absolute calibration improved (LHO:86070)
           After the above, HAM5 / SR3 estimator design was informed by the following measurements 
    - 2025-07-29 (In the presence SR3 SUSPOINT Basis ISI EXC; (ISI GS13s projected to SR3 SUSPOINT Y) to (SR3 M1 DAMP Y) LHO:86075, 
    - 2025-08-05 M1 to M1 LHO:86202, 
    - 2025-08-05 (In the presence SR3 SUSPOINT Basis ISI EXC; (ISI GS13s projected to SR3 SUSPOINT P) to (SR3 M1 DAMP P) LHO:86203
    - 2025-08-05 M1 to M1 LHO:86203
Design of estimator and blend filter aLOGs are quoted below by each filter
2025-08-19 Oli installed / configured these estimators this past Tuesday (LHO:86455)


::: PIT FILTERS :::
Design aLOG: LHO:86430
M1_EST_P_FUSION_MODL_SUSP_P_2GAP      "ISI_fit"    FM1      EPICS Gain: +1.0
sos(-0.001012906275385808, [-2.0001366554573741; 1.000136668010563; 
                            -1.999948594076947; 0.99994860612347214; 
                            -1.999955359352324; 0.99995565554604537; 
                            -1.999976011494571; 0.99997638571005953; 
                            -2.000046972353724; 1.0000477507088701; 
                            -1.9999816676161819; 0.99998231095588275; 
                            -1.999807905043806; 0.9998079477319114; 
                            -1.9999858561539881; 0.9999859195985662; 
                            -1.999989374293667; 0.99998949933234416; 
                            -1.9999885936664199; 0.99998867482680542; 
                            -1.9999967240112111; 0.99999852427171887; 
                            -1.9999908757192211; 0.99999261046439736])
                                                   "to_um/nm"   FM2           
zpk([],[],1.000000000000000,"n")                                             %% Yes, this is a gain of 1.0 and thus is not doing anything. This is vestigial. Calibration has been absorbed into the "ISI_fit."

M1_EST_P_FUSION_MODL_DRV_P_2GAP      "M1_fit"     FM1      EPICS Gain: +1.0
sos(6.9937614616314464e-08, [1.9999999999998279; 0.99999999999995282; 
                             -1.9999796747664531; 0.99998031671408905; 
                             -1.9999989658263551; 0.99999907355206619; 
                             -1.999984525961469; 0.99998458794634182; 
                             -1.999972378962787; 0.99997245232369414; 
                             -1.999986427026998; 0.99998650968797875; 
                             -1.9999982894453341; 0.99999986582789491; 
                             -1.9999908361882079; 0.99999257469114344])

                                                   "to_um/cts"   FM2           
zpk([],[],1.000000000000000,"n")                                             %% Yes, this is a gain of 1.0 and thus is not doing anything. This is vestigial. Calibration has been absorbed into the "M1_fit."

Design aLOG: LHO:86452
M1_EST_P_FUSION_MEAS_BP    "pit_v1"     FM1       EPICS Gain: +1.0
sos(0.1000427204344847, [-0.99977476062437198; 0; 
                         -0.99998082542398548; 0; 
                         -1.999507407187904; 0.99950802568624952; 
                         -1.9999459253790719; 0.99994656777201008; 
                         -1.9997448445054919; 0.99974638260765558; 
                         -1.9999542865584909; 0.99995602687005281])

M1_EST_P_FUSION_MODL_BP    "pit_v1"      FM1      EPICS Gain: +1.0
sos(0.8999572795655153, [-1; 0; 
                         -0.99998082542398548; 0; 
                         -1.999987516253469; 0.99998815869468505;
                         -1.9999459253790719; 0.99994656777201008; 
                         -1.9999884578241209; 0.99999019525631272;
                         -1.9999542865584909; 0.99995602687005281])

Copies of M1_DAMP_P: (EPICS Gain: -0.1)
P_DAMP_OSEM      EPICS Gain: -0.4
P_DAMP_FUSION    EPICS Gain: -0.4

The filters ON in each of these damping loop controller filter banks
rolloff_P    soft roll-off of sensor noise                 zpk([0;2;5],[20;20;30;30],0.005,"n")
boost_P      extra gain at first Y resonance               zpk([0.415914+i*0.587721;0.415914-i*0.587721;0.67;0.77],[0.246255+i*0.676579;0.246255-i*0.676579;0.131518+i*0.707886;0.131518-i*0.707886],1,"n")
norm_P       nominal unit conversion from um to ADC ct     zpk([],[],43.478,"n")
x0.628       gain adjustment from absolute calibration     gain(0.628)
bounceRoll   highest V and R mode notch tailored for SR3   ellip("BandStop",4,1,60,27.5,28.0)ellip("BandStop",4,1,60,45.0,45.5)gain(1.25893)
ellip_P      aggressive roll-off of sensor noise           zpk([0.64975+i*9.7463;0.64975-i*9.7463],[1.22183+i*5.87428;1.22183-i*5.87428;2.7978],1,"n")

(total OSEM gain or OSEM+Estimator gain of -0.5 for P, the prior-to-estimator "nominal" gain we'd been running since Aug 15 2023 LHO:72249)


::: YAW FILTERS :::
Design aLOG: LHO:86233
M1_EST_Y_FUSION_MODL_SUSP_Y_2GAP      "ISI_fit"     FM1     EPICS Gain: +1.0
sos(-0.00097333255316384561, [-2; 0.99999999999999989; 
                              -1.999987505826812; 0.99998828408658169;
                              -1.9999917387445989; 0.99999222786356268; 
                              -1.999991053658418; 0.99999120602937952;
                              -1.9999951079581699; 0.99999667180704854; 
                              -1.9999907068801011; 0.99999239185345823])

                                                   "to_um/nm"   FM2           
zpk([],[],1.000000000000000,"n")                                             %% Yes, this is a gain of 1.0 and thus is not doing anything. This is vestigial. Calibration has been absorbed into the "ISI_fit."

M1_EST_Y_FUSION_MODL_DRV_Y_2GAP      "M1_fit"     FM1       EPICS Gain: +1.0
sos(1.1347068995497109e-08, [2.000000000001652; 0.99999999999677247; 
                             -1.9999881576357379; 0.99998893434766245; 
                             -1.999998372312229; 0.99999974909962519; 
                             -1.99998928164089; 0.99999097015263916; 
                             -1.999998867104356; 0.99999912434806359; 
                             -1.99999256126361; 0.99999271377731203])

                                                   "to_um/cts"   FM2           
zpk([],[],1.000000000000000,"n")                                             %% Yes, this is a gain of 1.0 and thus is not doing anything. This is vestigial. Calibration has been absorbed into the "M1_fit."

Design aLOG: LHO:86265
M1_EST_Y_FUSION_MEAS_BP      "SKY_notch"      FM1      EPICS Gain: +1.0
sos(0.000183409288171444, [1; 0; 
                           -0.99996165121563274; 0; 
                           -1.999942013670952; 0.99994237961280041;
                           -1.999812801308257; 0.99981448778963355; 
                           -1.9999004183717279; 0.99990166730434937;
                           -1.999852310365053; 0.99985308742131895; 
                           -1.9999736341441301; 0.99997367996470554;
                           -1.9999216555380299; 0.99992180839221256])


M1_EST_Y_FUSION_MODL_BP             "SKY_notch"        FM1       EPICS Gain: +1.0 
sos(0.9998165907118286, [-1.0000000000000011; 0; 
                         -0.99996165121563274; 0; 
                         -1.999961208202631; 0.99996289480915956; 
                         -1.999812801308257; 0.99981448778963355; 
                         -1.9999698386597631; 0.99997061576169488; 
                         -1.9998523103650541; 0.9998530874213194; 
                         -1.9999842083331081; 0.99998436119207135; 
                         -1.9999216555380299; 0.99992180839221256])


Copies of M1_DAMP_Y: (EPICS Gain: -0.1)
Y_DAMP_OSEM      EPICS Gain: -0.4
Y_DAMP_FUSION    EPICS Gain: -0.4

rolloff_Y    soft roll-off of sensor noise                 zpk([0;1],[20;30;30],0.01,"n")
boost_Y      extra gain at first Y resonance               zpk([0.9;1.1],[0.173648+i*0.984808;0.173648-i*0.984808],1,"n")
norm_Y       nominal unit conversion from um to ADC ct     zpk([],[],43.478,"n")
x0.757       gain adjustment from absolute calibration     gain(0.757)
bounceRoll   highest V and R mode notch tailored for SR3   ellip("BandStop",4,1,60,27.5,28.0)ellip("BandStop",4,1,60,45.0,45.5)gain(1.25893)
ellip_Y      aggressive roll-off of sensor noise           zpk([0.97195+i*9.7195;0.97195-i*9.7195],[1.0264+i*4.9347;1.0264-i*4.9347;2.7978],1,"n")

(total OSEM gain or OSEM+Estimator gain of -0.5 for Y, the prior-to-estimator "nominal" gain we'd been running since Aug 15 2023 LHO:72249)