Lockloss tool cannot connect.

Generally these all look fine with regard to the intention of this test.  There are no outlying base levels in the higher frequency (above the 'details' < 20 Hz) range.

16:51 Daniel and Keita out to LVEA to work on PMC

17:09 Hugh reports that ISI_CONF reporting ETMY at BLEND_45mHz_SC_useism is actually incorrect. It's actually set to the 250mHz.

17:13 LASER tripped (injection locking) while Keita and Daniel working in PSL rack. Jason coming to control room to restart.

17:56 Relocking resumed

17:57 Cheryl on site

For such high microseism situations, it may be worth switching back to the 45 mHz blends for all the test-mass chambers, with or without sensor correction.

We are leaving the IFO in observe, but there is scattering from ISCT1 because we can't move to REFL wfs with the higher ground motion. This is something to look at in the morning, but it caused us many locklosses tonight.  

The IMC WFS offsets that were working early last week don't seem repeatable tonight.

Nutsinee switched the test mass ISIs to BLEND_45_SC_useism, that went OK except for some large glitches when switch ETMX, but when I tried switching to REFL WFS again we dropped the lock.  We probably need to look at finding a better matrix for refl WFS and getting rid of the oscialltion in the centering and IMC WFS. 

Speculation about REFL WFS.  Yesterday I was concerned that PR2 had moved what seemed like a lot (8-10urad) when I did the Inital Alignment.  I would expect something smaller like 2urad.  I couldn't find a cause for that, but I did notice IM4 also changed by 20urad in yaw.  A change of 20urad in yaw of IM4, assuming PRM moved to match the change of the PRC input beam, would propigate to the REFL WFS, and my estimate for the change in beam position at REFL WFS to be 168um.  I don't know the beam size on REFL WFS, but the IMC WFS is about 250um, so if REFL WFS is about the same, the 168um is a beam position change of ~70%.

Summary

A refined analysis of the L1, L2 and L3 stange actuation strenghts was done using the data from last several days that include several low-noise lock stretches. Actuation strength factors are:

K_U = 8.020^-8 +/- 2.983^-10 N/ct   ( std(K_U) / |K_U| = 0.0037 )

K_P = 6.482^-10 +/- 2.748^-12 N/ct   ( std(K_P) / |K_P| = 0.0033 )

K_T = 4.260^-12 +/- 1.313^-14 N/ct   ( std(K_T) / |K_T| = 0.0031 )

Details

Following 4 lines were used to calculate the factors: UIM (L1) line at 33.7 Hz, PUM (L2) line at 34.7 Hz, TST (L3) line at 35.9 Hz and PcalY line at 36.7 Hz. The most recent DARM model parameters were used for this analysis. Also, values past Nov 5 were calculated with the updated DARM filters (see LHO alog 31201), not accounting for this would produce results biased by 1-2%.

Each data point is a quantity calculated from 10s FFTs. The outliers were removed in two steps:
- took the mean and the standard deviation of all data points in intervals when the IFO range was >=50 MPC, removed 3-sigma outliers;
- removed the 3-sigma outliers from the mean of the remaining data points.

The mean values and the standard devitaions noted above were taken from GPS time interval [1162369920 1162413500], ~11 hours of low-noise data (blue markers). Standard errors on the mean values, std(K_i) / sqrt(N), are orders of magnitude smaller compared to the Pcal and the DARM loop model uncertainties (number of data points in the seletected interval - N=4251).

For preliminary results from Nov 4 data and before see related reports: 31183, 31275.

Recall the ER8/O1 values for these coefficients were

    'Optic'      'Weighted Mean'    '1-sigma Uncertainty'    '1-sigma Uncertainty'
    'Stage'      '[N/ct]'           '[N/ct]'                 '%'                  
    'ETMY L1'    '8.17e-08'         '3.2e-09'                '3.9'                
    'ETMY L2'    '6.82e-10'         '5.2e-13'                '0.076'              
    'ETMY L3'    '4.24e-12'         '4.1e-15'                '0.096' 
from LHO aLOG 21280.

Comparing against numbers above,
    KU = 8.020-8 +/- 2.983-10 N/ct   ( std(KU) / |KU| = 0.0037 )
    KP = 6.482-10 +/- 2.748-12 N/ct   ( std(KP) / |KP| = 0.0033 )
    KT = 4.260-12 +/- 1.313-14 N/ct   ( std(KT) / |KT| = 0.0031 )

This means a change of
               (ER8 - ER10)/ER8 = 
    ETMY L1        0.0183
    ETMY L2        0.0495
    ETMY L3       -0.0047

We will compare these numbers against those determined by frequency-dependent transfer functions, e.g. the to-be processed data from LHO aLOG 31303, and update the low-latency/ calibration accordingly next week. It will also be interesting to re-cast the L1 and L2 numbers into a combined actuation strength change from ER10/O1, and compare it against the constantly calculated kappa_PU and check consistency there.

Data points prior to DARM filter update mentioned in the report were analyzed with the help of following DARM model parameters:

ifoIndepFilename : ${CalSVN}/Runs/PreER10/Common/params/IFOindepParams.conf (r3519)
ifoDepFilename   : ${CalSVN}/Runs/PreER10/H1/params/H1params.conf (r3640)
ifoMeasParams    : ${CalSVN}/Runs/PreER10/H1/params/H1params_2016-10-13.conf (r3519)

and after the the DARM filters were updated (GPS 1162336667) the following configuration was used:

ifoIndepFilename : ${CalSVN}/Runs/PreER10/Common/params/IFOindepParams.conf (r3519)
ifoDepFilename   : ${CalSVN}/Runs/PreER10/H1/params/H1params_since_1162336667.conf (r3640)
ifoMeasParams    : ${CalSVN}/Runs/PreER10/H1/params/H1params_2016-10-13.conf (r3519)

Scripts were uploaded to CalSVN at

${CalSVN}/Runs/PreER10/H1/Scripts/Actuation/2016-11-08/

5 days SLM data (75 MB): ${CalSVN}/Runs/PreER10/H1/Measurements/Actuation/2016-11-08/

Plots: ${CalSVN}/Runs/PreER10/H1/Results/Actuation/2016-11-08_H1_UPT_act_strengths_*

We discovered that in the single-line analysis we had an incorrect sign for TST stage actuation (we incorrectly set the sign of the N/ct coefficient).

The updated results have been posted in LHO alog 31668.

A better plot showing the relationship between the ILS and PMC mixer and HVMon signals.

Reducing the ILS gain by 16 dB increases the noise seen by the PMC by the same amount below 1 kHz. This change reduced the ILS ugf from ~10 kHz down to ~1 kHz.

PMC and HPO PZT characterization/calibration

The PMC PZT is decribed in alog 30729:

• Model: PI PAHH-0013
• Capacitance: 63 nF
• Travel: 4 µm/kV
• Series resistor: 3.3 kΩ
• Pole: ~770 Hz.

The ILS PZT is

• Capacitance: 120 nF
• Travel: 15 µm/kV
• Series resistor: 3.3 kΩ
• Pole: ~400 Hz.