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Reports until 07:55, Tuesday 18 February 2014
H1 CDS
sheila.dwyer@LIGO.ORG - posted 07:55, Tuesday 18 February 2014 (10130)
h1ecatx1 restarted

Alexa, Sheila

The x end ethercat was not running when we got here.  It had the choose runtime system error.  I created botprojects for each plc, as I was doing that the computer crashed.  I restarted again using the restart script, the plcs were running when it came back up.  I burted all three to friday at 11:00

H1 SYS (IOO, ISC, SUS, SYS)
jameson.rollins@LIGO.ORG - posted 23:28, Monday 17 February 2014 (10128)
guardian upgrades

A bunch of guardian upgrades were done over the weekend:

guardian core was upgraded.  it's currently at r720, but it's still moving as bugs are identified and features added

cdsutils (ezca) was upgraded . currently r164, but again still working out some kinks.

The guardian supervision infrastructure was upgraded and moved to a new location on local disk on h1guardian0.  I'll report on the new infrastructure in a followup post.  This required killing the main process supervisor ("initctl stop guardian-runsvdir"), which shut down all the current guardian nodes.

The SUS base guardian code was upgraded.  The base SUS.py was copied over from LLO.  Some improvements have been made as well, which I'll report on later.  Once this was in place I brought up the SUS_SRM node for testing.  Was it seemed to be behaving well the SUS_MC{1,2,3} nodes were restarted.  The rest of the SUS nodes were left off for the moment, but will be restarted tomorrow.

The IMC autolocker code was upgraded.  The new code is based on the code that was developed at LLO.  Again, to be expounded later.  The IMC autolocker upgrad exposed some issues with the current guardian behavior that will need to be fixed tomorrow.

H1 SUS
brett.shapiro@LIGO.ORG - posted 22:08, Monday 17 February 2014 (10124)
SR2 model fit results
Last week with Andres's help I measured resonance frequencies on SR2 in the double and single hang cases (top locked on stops and middle locked on stops respectively). This log reports the results of fitting the hsts model to that data. The adjusted parameters are listed below with the estimated error bars. Typically I allow d1 (top mass spring tip height) to move. Interestingly, the model had better results when the height of the bottom mass prism was allowed to move instead. Floating d1 did allow the resonances to line up with similar precision, however d1 and I1y  would drift very far from their nominal positions to do this, about 5 mm on d1 and 50% on I1y.

The attachment H1SR2_ModelFit_17Feb2014.pdf shows the measured transfer functions against the nominal model and the model fit. The measured L-P/P-L and T-R/R-T TFs do not show good symmetry, so those comparisons should be taken with a grain of salt. Likely the OSEM balancing is poor as poor balancing will cause errors in the measured zero locations. Similarly, the 1.5 Hzish zero on the measured Roll to Roll TF is probably slightly off from reality. It does not correspond exactly to the measured double hang Roll resonance as it should, and it is also somewhat off from other HSTS suspensions.

The attachment H1L1SR2comparison_17Feb2014.pdf shows the same results but against L1SR2. The new model also fits L1SR2 better, though there are some minor differences.

The new parameter file is on the svn at ...sus/trunk/Common/MatlabTools/TripleModel_Production/hstsopt_H1SR2fit.m

The model fitting code for H1SR2 is on the svn at ...sus/trunk/Common/MatlabTools/TripleModel_Fit/TripPend_GaussNewton_fit_v5_H1SR2.m


Change in parameters from original model with the estimated minimum errors
---------------------------------------
d4: -1.6798 +- 0.094782 mm
I1x: -6.3844 +- 1.2588 %
I2x: -5.2885 +- 11.4653 %
I3x: -3.706 +- 12.1017 %
I1y: 8.8773 +- 0.61371 %
I2y: -5.583 +- 0.5374 %
I3y: -4.6949 +- 0.36401 %
I1z: -5.7573 +- 0.9752 %
I2z: 1.2902 +- 1.0012 %
I3z: -3.2293 +- 0.30808 %
l1: 5.5655 +- 3.3226 mm
l2: 4.2327 +- 0.52961 mm
l3: 1.4169 +- 0.40356 mm
kc1: -1.2835 +- 1.2589 %
kc2: 2.4943 +- 0.4258 %
---------------------------------------
Non-image files attached to this report
H1 SUS
mark.barton@LIGO.ORG - posted 15:29, Monday 17 February 2014 (10123)
New TMTS models
 
I created new versions of the first article and production TMTS Mathematica/Matlab models using data from Eddie Sanchez' D0902773-v8 of 12/25/13:
 
/ligo/svncommon/SusSVN/sus/trunk/TMTS/Common/MatlabTools/tmtsopt_firstarticle.m r6273
/ligo/svncommon/SusSVN/sus/trunk/Common/MathematicaModels/DualLite2DBLateral/20131224TMTS_FirstArticle
20131224TMTS_FirstArticle
 
/ligo/svncommon/SusSVN/sus/trunk/TMTS/Common/MatlabTools/tmtsopt_production.m r6273
/ligo/svncommon/SusSVN/sus/trunk/Common/MathematicaModels/DualLite2DBLateral/20131224TMTS_Production
20131224TMTS_Production
 
Formerly we had been using tmtsopt_firstarticle.m r4580 for both the first article (LHO TMSy) and production builds. It mostly used numbers read from the EASM file of D0900419-v2, plus mass parameters supplied by Ken Mailand. It had required quite a large tweak of +4.3 mm to d1 to match modeR1 at 0.679 Hz, but otherwise matched both builds reasonably well. A matching production parameter set was created, but lacked updated dimensions values for the production telescope and was not used.
 
The new parameter sets use all as-built numbers from D0902773-v8, with one exception: the new first article needs a smaller but still significant tweak of +2.7 mm to d1 to match modeR1=0.679 Hz. The new production parameter set needs no tweaks to match modeR1=0.65 Hz.
 
Plots of the new first article model against H1 TMSy data and the new production model against L1 and H1 TMSx data are attached. The mode frequencies are as per the table below. Note that modeP1 and modeV1 have leap-frogged.
 
	tmtsopt_firstarticle    tmtsopt_firstarticle    tmtsopt_production
r4580                   r6273                   r6273
--------------------------------------------------------------------
modeY1      0.355864    modeY1      0.357487    modeY1      0.356438
modeT1      0.447407    modeT1      0.44897     modeT1      0.44903
modeL1      0.473763    modeL1      0.474697    modeL1      0.474545
modeR1      0.678918    modeR1      0.679192    modeR1      0.650001
modeP1      0.713869    modeV1      0.73404     modeP1      0.729786
modeV1      0.729389    modeP1      0.754609    modeV1      0.750216
modeT2      1.38385     modeT2      1.36581     modeT2      1.37346
modeL2      1.72689     modeL2      1.72179     modeL2      1.73388
modeV2      2.40587     modeV2      2.40182     modeV2      2.40454
modeP2      2.44574     modeP2      2.44429     modeP2      2.56147
modeY2      2.59116     modeY2      2.58853     modeY2      2.71571
modeR2      4.27789     modeR2      4.14866     modeR2      4.31193

   tmtsopt_firstarticle    tmtsopt_production
r4580                   r6273                   r6273
--------------------------------------------------------------------
modeY1      0.356438    modeY1      0.357487    modeY1      0.356438
modeT1      0.44903     modeT1      0.44897     modeT1      0.44903
modeL1      0.474545    modeL1      0.474697    modeL1      0.474545
modeR1      0.650001    modeR1      0.679192    modeR1      0.650001
modeP1      0.729786    modeV1      0.73404     modeP1      0.729786
modeV1      0.750216    modeP1      0.754609    modeV1      0.750216
modeT2      1.37346     modeT2      1.36581     modeT2      1.37346
modeL2      1.73388     modeL2      1.72179     modeL2      1.73388
modeV2      2.40454     modeV2      2.40182     modeV2      2.40454
modeP2      2.56147     modeP2      2.44429     modeP2      2.56147
modeY2      2.71571     modeY2      2.58853     modeY2      2.71571
modeR2      4.31193     modeR2      4.14866     modeR2      4.31193
 
Non-image files attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 11:25, Monday 17 February 2014 (10122)
SEI Status mid morning Monday--All on sans BS-ISI

All the SEIs are operating as left Friday evening except the BS.

The BS ISI is tripped with a GS13 trip at 1076474647 followed by an Actuator limit trip 44 seconds later.  So this ISI only lasted for a few hours (til 2043 pst Friday evening.)  The watchdog plotting tools are not functional at this time, and its a holiday.

Taking the ISI back up, I see the current location and target for Rx is a mear 900nrads but this is too much tilt to start with the Trilliums in the loop.

Can a ISC/PRMI Commissioner confirm that we must servo to this value?  Certainly would make getting the IS back on easier if we could reset these targets.

So going up with the 250mHz blends ( with the T240 watchdog trigger level increased the second time.)  Have moved the Stage1 to nominal blends (T250 everywhere with the T100.44NO for X & Y)  Stage2 is also on with the 250mHz blends.  I notice the signal for Z is large on stage2 so I've turned off the Z boost.  It still has some pretty large swings though...  Seems to be some large low frequency oscillation comes and goes.  Will still likely trip I'm thinking.  If it doesn't hold maybe the blend shold be moved back to 750s.  I know Jim is still working on the loops here.

I was starting to see the Epics readouts for the output filters get into the 1000s for the horizontals (already doing the vertical s for a while,) so I switched Stage2 to the 750mHz blends.  This certainly reduced these readback's magnitude right away.  I've reenabled the Z boost now as a result.

I'll leave the ISI at this for the moment: Stage2 Lvl2 with 750mHz blend, Stage1 is Lvl2 with T100mHzNO.44 blends on X & Y and T250mHz elsewhere.  Sadly, the BLRMS needs a lot more green.

H1 PEM
jameson.rollins@LIGO.ORG - posted 09:50, Monday 17 February 2014 (10121)
alarm fugue

Given that it's a holiday, there are no operators on site to silence the alarm chorus.  There are some CDS alarms that I can't quite identify the source of, but the CDS system looks ok on the whole, so I'm just silencing them temporarily.

There does seem to be a persistent alarm from the EY dust monitor.  I ACK'd it once when I came in, but it was back again a couple minutes later.

H1 ISC (ISC)
evan.hall@LIGO.ORG - posted 21:26, Sunday 16 February 2014 - last comment - 10:57, Tuesday 18 February 2014(10120)
ALS-X BBPD has gone dark

The ALS-X BBPD appears to have gone dark around 2:30 PST on Friday.  The EX laser IR PD and fiber monitor PDs appear to have been disturbed around the same time, but they have recovered.

Possibly this is related to Friday's work on installing WFS on the ISCTEX table, or the related editing of the X-end simulink models.

Images attached to this report
Comments related to this report
keita.kawabe@LIGO.ORG - 10:57, Tuesday 18 February 2014 (10139)

The +-18V PD power supply cable for the table was unplugged at the power strip on the field rack. All DC diodes connected to the DC diode interface were down.

Should work now.  

Don't know why it was unplugged, it's hard to accidentally plug it off. 

H1 DAQ (CDS)
david.barker@LIGO.ORG - posted 09:19, Sunday 16 February 2014 (10119)
DAQ Status

Over the weekend both frame writers have restarted in the early hours. fw1 just after midnight Sat morning (00:01) and fw0 this morning at 01:00. They had both been very stable over the past week.

H1 ISC
daniel.sigg@LIGO.ORG - posted 23:13, Friday 14 February 2014 - last comment - 08:25, Tuesday 18 February 2014(10118)
ALS WFS in EX

(Blue Team)

Short progress report:

More details to follow.

Comments related to this report
keita.kawabe@LIGO.ORG - 08:25, Tuesday 18 February 2014 (10129)
  • "50:50 splitter" turns out to be more like 20:80.  Due to this, WFSA interface was set to high DC gain mode while WFSB is low.
  • Things were put in place based on Jax's calculation, without measuring the beam. Beam profile was measured at some places but it was so ugly I don't think it makes much sense to make an analysis.
  • The first attachment is the beam profile right after the beam is picked off of the REFL diode path. Ugly.
  • The second is the profile of the beam going into the chamber upstream of the 1" lens (between L6 and M9). One side is clipped off. I don't post all pictures but the beam is reasonable after the first Faraday, not terrible after EO, bad after the second Faraday.
  • A part of the problem seems to be in the input beam. Didn't try to "fix" it, as the past attempts to do so with existing components failed multiple times in OAT. I really believe that we need to put Faraday on an adjustable mount.
  • DC path is working, so are the picos.
  • RF path is yet to be checked.
Images attached to this comment
H1 ISC
stefan.ballmer@LIGO.ORG - posted 20:09, Friday 14 February 2014 (10117)
ODC master for the rest of E5
I set up the H1 ODC master channel: H1:ODC-MASTER_CHANNEL_OUT_DQ

The "H1 Interferometer Summary" bit (bit0) now includes the following bits:
Bit4:  PSL Summary (EPICS timing only)
Bit5:  IMC Summary
Bit 21:ADC overflow (for PSL, EPICS timing only)
Bit 22:DAC overflow (for PSL, EPICS timing only)
Bit 23:EXC on       (for PSL, EPICS timing only)
Bit 28:Guardian Observation Ready
Bit 29:Operator Science Mode Button

The guardian that will be serving bit 28 is not running yet.


Images attached to this report
H1 IOO (IOO, ISC, SYS)
stefan.ballmer@LIGO.ORG - posted 19:04, Friday 14 February 2014 (10116)
Iss saturation
I noticed from the ODC summary that the ISS was running out of range again. I  changed the set point (ISS_REFSIGNAL) from -1.93 to -1.88.

I also verified  that this was not due to a noise eater oscillation (ODC didn't indicate it as such, and toggling it didn't change it.)

H1 SEI (ISC, SEI)
hugo.paris@LIGO.ORG - posted 17:40, Friday 14 February 2014 (10114)
SEI Platform Status

Foton files were cleaned up for every SEI platform (ISI + HEPI). Details about the cleanup process can be found in SEI aLog #370

Every SEI platform was turned off, had its filter coefficient reloaded, and turned back on exepted ETMX ISI and HEPI, which ISC commissioners needed. ETMX's platforms will get their filters reloaded at the next window of opportunity.

Work started at 4:50PM and just finished. It was performed under WP #4435 which is now closed.

 

SEI crew (Jim, Hugh, Hugo) left its platforms in the following state:

H1 SEI (INS)
jim.warner@LIGO.ORG - posted 17:27, Friday 14 February 2014 (10115)
Good install progress on ETMY ISI today, but more to go

Hugh and I mostly finished cabling ETMY ISI today, but were held up by an issue with the CPS's and some broken test feed thru components. After we powered up the CPS's, we were systematically disconnecting sensors to verify routing and we noticed that the corners 2 and 3 were acting weird. After rounds of calling Richard, plugging and unplugging various cables, we figured out that the ribbon cable that carries the sync signal from the satellite rack chassis to it's power/distribution board was plugged in backwards. The other racks have keyed cables to prevent this, but this rack had an unkeyed cable. After fixing this we found that we also have a dead sensor, further debugging has that narrowed down to a broken probe. We don't have time today to finish balancing, so we'll continue on Tuesday.

H1 DAQ (CDS)
david.barker@LIGO.ORG - posted 17:15, Friday 14 February 2014 (10113)
DAQ Restart

Late entry, DAQ restart performed at 15:59PST.

Restarted the DAQ for three reasons:

The frame broadcaster had the following channels added

+[H1:PEM-EX_SEIS_VEA_FLOOR_X_DQ]
+[H1:PEM-EX_SEIS_VEA_FLOOR_Y_DQ]
+[H1:PEM-EX_SEIS_VEA_FLOOR_Z_DQ]
+[H1:PEM-EY_SEIS_VEA_FLOOR_X_DQ]
+[H1:PEM-EY_SEIS_VEA_FLOOR_Y_DQ]
+[H1:PEM-EY_SEIS_VEA_FLOOR_Z_DQ]+[H1:PEM-EX_SEIS_VEA_FLOOR_X_DQ]
+[H1:PEM-EX_SEIS_VEA_FLOOR_Y_DQ]
+[H1:PEM-EX_SEIS_VEA_FLOOR_Z_DQ]
+[H1:PEM-EY_SEIS_VEA_FLOOR_X_DQ]
+[H1:PEM-EY_SEIS_VEA_FLOOR_Y_DQ]
+[H1:PEM-EY_SEIS_VEA_FLOOR_Z_DQ]
 
More will be added during next Tuesday's maintenance.
H1 General
andres.ramirez@LIGO.ORG - posted 16:00, Friday 14 February 2014 - last comment - 16:02, Friday 14 February 2014(10111)
Ops Shift Summary
8:50      PSL Check ok. NOTE: ISS Diffracted Power is low (1.4%) and unstable with peaks over 20%. It should be 5-15%)
9:00-12:00 Going to End X to do cabling – Luis/Filiberto
10:00-12:00 Baffle work (disassembling contaminated scrapple baffle, searching for parts for arm cavity installation, and general cleanup) in LVEA West bay – Mitchell
11:01-11:03 DAQ restart – Dave
11:10-11:45 heading into the LVEA to get parts – Gerardo
12:12-12:15 Change h1iopsusey model to remove the DC OSEM component from the software watchdog – Dave 
14:15-15:51 PCAL assembly on H2 PSL – Joe
14:22-   Taking some parts to End Y – Corey
15:02-15:50 Back into the LVEA West bay (Searching and organizing Baffle parts – Mitchell
15:59   DAQ restart - Dave

NOTE: I noticed that the ISS Diffracted Power has been unstable today. It was about 1.4% in the morning with high peaks over 20% during the day (is this normal?). Based on one of the PSL trainings it should be 5-15%. I have added some pics from today and one from the last 5 days.
Comments related to this report
andres.ramirez@LIGO.ORG - 16:02, Friday 14 February 2014 (10112)


		
		
Images attached to this comment
H1 SEI (SEI, SYS)
hugo.paris@LIGO.ORG - posted 15:45, Friday 14 February 2014 (10109)
HAM4-IS - 100% ready for Guardian testing

We could not close the ISO loops on HAM4-ISI yesterday, even thought those are Level 1 generic loops. We ran transfer functions overnight, which allowed me to tweak the symmetrization filters. I also corrected a few minor typos in the unit-specific scripts. 

ISO Lv1 loops are now stable with any of the 4x blend filters installed:

I duplicated ISO Lv1 into the filter modules reserved to Lv2 and Lv3. Those use more that one filter bank. I filled the extra filter banks with gains of one. Same goes for the Boost filters. Those only use 1x filter module though.

Here is what is loaded in the ISO filter banks:

I tried turning on different combination of ISO and DAMP with the control scripts. They all worked. HAM4-ISI good to go as far as starting Guardian testing goes! yes

Images attached to this report
H1 SUS
brett.shapiro@LIGO.ORG - posted 02:47, Friday 14 February 2014 - last comment - 18:50, Monday 03 March 2014(10089)
ETMY Modeling Results
Results of my visit to LHO this week for system identification of the ETMY.

MOTIVATION:

Make better models for each particular suspension to aid control design and noise predictions.

The measured frequencies of the resonances are the most reliable data we have because they are not subject to errors in the sensors or actuators. There are also numerous resonances available for measurement, which can be used to adjust the model.

SETUP:

Resonance measurements were collected on ETMY main chain while on the test stand in the follow configuration with the following methods:
* full quad - top mass to top mass transfer functions using the OSEMs. This data was measured prior to my visit this week.
* triple hang - with the main chain top mass, reaction chain UIM and PUM masses locked on stops, spectra of the lower three main chain stages were measured with the UIM and PUM OSEMs and an optical lever on the test mass. No excitation is needed since the wind from the fans is more than enough. The process of locking the masses also misaligns the UIM and PUM OSEMs sufficiently that they are sensitive to vertical, roll, and transverse displacements of the stages. This allows us to measure more resonances with these OSEMs then we otherwise would. The optical lever isn't sensitive to any resonances the OSEMs miss, but it does add redundancy to help identify a forest of high Q pendulum resonances from spectra that include a lot of similarly shaped artifacts.
* double hang - with the main chain UIM and reaction chain PUM locked on stops, spectra of the main chain lower two stages were measured with the PUM OSEMs. In this case the optical lever would not stay in range, so the data is just the 4 PUM OSEMs.
* single hang - with the PUM on the teflon line stops, the test mass modes were measured with optically. This data was measured prior to my visit.

SUMMARY:

The data encompasses 56 resonance frequencies: 22 free quad, 16 triple hang, 12 double hang, and 6 single hang. See the attached plots and the summary of parameter changes below. In the attachment the black curves are the measured data, the blue the original model, and the red the new model. Pages 1-6 of the attachement show the diagonal top mass to top mass transfer functions. Pages 7-8 show L-P coupling and 9-10 T-R coupling. 11-13 are the frequencies of the triple, double, and single hangs respectively. 14 plots the mode frequency percent errors before the fit and 15 shows the same after the fit. The final page shows the convergence of the total error, where the error is calculated as

                  sum( [(measure mode - modeled mode)/(measured mode)]^2 ) 

The algorithm for fitting the data is Gauss-Newton, an approximation of Newton's method. The fitting code is on the svn at .../sus/trunk/QUAD/Common/MatlabTools/QuadModel_Fit/QuadPend_QuassNewton_fit_v2_H1ETMY.m.

Change in parameters from original model with the estimated convergence errors:
---------------------------------------
Inx (top mass roll inertia)                       : -1.0926 +- 2.6994 %
Iny (top mass pitch inertia)                    : 3.1636 +- 3.4396 %
Inz (top mass yaw inertia)                      : -0.86123 +- 0.65824 %
I1x (UIM roll inertia)                               : 3.9571 +- 0.77982 %
I1y (UIM pitch inertia)                             : 12.2729 +- 2.5078 %
I1z (UIM yaw inertia)                               : -0.10972 +- 0.55984 %
I2x (PUM roll inertia)                               : -2.9587 +- 0.85205 %
I2y (PUM pitch inertia)                            : 8.4597 +- 0.6904 %
I2z (PUM yaw inertia)                             : 0.011768 +- 0.3983 %
I3x (test mass roll inertia)                      : 2.2009 +- 0.77109 %
I3y (test mass pitch inertia)                    : -8.8738 +- 0.79819 %
I3z (test mass yaw inertia)                     : 0.44122 +- 0.5629 %
l2 (PUM wire loop length)                      : 8.6866 +- 1.1464 mm
l3 (fiber length)                                     : 22.1269 +- 2.6176 mm
kcn (top stage spring stiffness)              : 1.0719 +- 2.166 %
kc1 (top mass spring stiffness)              : 1.0935 +- 0.68178 %
kc2 (UIM spring stiffness)                      : 2.2795 +- 0.39067 %
kw3 (fiber bounce stiffness)                  : 9.4286 +- 0.4488 %
dn (top mass blade tip height)              : -0.20928 +- 0.303 mm
d1 (UIM blade tip height)                      : 1.8131 +- 0.56431 mm
d4 (effective fiber flexure at test mass): -4.8356 +- 0.23685 mm
---------------------------------------


DISCUSSION:

The fit of the original model was fairly descent already, except for pitch. The fit of the new model to this data is even better, especially for pitch. The worst mode frequency error decreases from 8.2% to 1.3%. Interestingly, even though only resonance frequencies were included in the fit, the shapes of the transfer functions (including zeros) all match well also. This goes for the cross coupling measurements as well. Note, the length to pitch measurement does not match the pitch to length. These should in theory be identical. Mismatches indicate measurement problems. Length to pitch has some low frequency notches that don't exist in pitch to length. Judging by the models (both before and after), I think it is likely that pitch to length is the more accurate measurement up to 4 Hz. I don't think we can believe either beyond 4 Hz. After the fit, the worst error in mode frequency corresponds to the first roll mode for both the free quad case and the triple hang case.

The inclusion of the extra resonance frequencies made a huge difference in the ability of the model to converge. In this case, a total of 21 parameters were floated. Normally, only a few at a time can be floated using just top mass data.

Many of the parameter changes produced by the fitting code seem quite reasonable. Some that are beyond what you would expect are the lengths of the fibers and the PUM wire loop. These changed by 22 mm and almost 9 mm respectively. Since the mass values are known, the only way to fit all 10 measured longitudinal modes is to adjust the wire lengths. This was achievable by floating both these wire/fiber lengths. I noticed that the default value in the original model for the PUM wire loop has the following comment: "% wire hang value - Mark Barton, 11/22/2011". I wonder if the entered value is no longer correct since the quad is not in the 'wire hang' configuration anymore. Regarding the fibers, the effective flexure length is rather complicated due to the geometry of the fibers. Perhaps some other error, like in fiber radius can mimic this. Note, the bounce mode stiffness moved by 9%.

The d4 change is also large. It is very likely this value is not physical because this parameter has significant degeneracy with both d3 and d2. Thus, the decrease of 5 mm could be spread out between all 3. d2 also has twice the sensitivity, so a small shift there can take up a fair bit of this 5 mm on its own. These degeneracies prevent the fitting code from floating these parameters simultaneously, so you simple have to pick one. d2 is sort of awkward because it is degenerate enough that it is difficult to float with either d3 or d4, but different enough that floating it instead of d3 or d4 yields different results.

DISCLAIMER:
As usual, the choice of parameters to float was made by experience and intuition. These parameter changes are not necessarily representative of reality. Though, with a fit that matches all 56 measurements to the 1% level, you might start to think that this thing is converging within some distance of reality.

COMPARISON WITH FUTURE MEASUREMENTS:
We should see how this new model holds up against L-P measurements at other stages and between stages.


NOTES:
The high frequency vertical and bounce modes were visible on the single hang and double hang measurements, but not the triple and free quad. If they were visible in all there would be 60 measured resonances. However, these modes are virtually the same from double hang to triple hang to free quad because they involve primarily displacement between the bottom two masses. Thus, the loss of information is negligible. In fact, we might be better off not including these extra bounce modes in case they emphasize bottom mass parameters over the upper masses since the same information would essentially be repeated 3 times.
Non-image files attached to this report
Comments related to this report
brett.shapiro@LIGO.ORG - 22:14, Monday 17 February 2014 (10125)
I found a typo in the model fitting code that explains the change in the fiber length. In the code the nominal d3 and d4 values, each 10 mm, were subtracted from the fiber length. The fitting code, doing what it is supposed to do, detected that the fiber length was incorrect and added 22 mm to compensate. The 2 mm difference is in the noise since the fiber length has a weak influence on the dynamics at the mm level. Note that the code did output a +-2.6 mm error bar for this fiber length change.

I'll take this as good news that the fitting code works.

The model fitting code has been updated on the svn with the bug fix.

The new parameter file is on the svn at:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/MatlabTools/QuadModel_Production/quadopt_fiber_H1ETMY.m
brett.shapiro@LIGO.ORG - 23:17, Monday 17 February 2014 (10126)
The following attachment shows that the new model is also a good match for L1ETMY.
Non-image files attached to this comment
brett.shapiro@LIGO.ORG - 18:50, Monday 03 March 2014 (10479)
A new alog entry at https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=10476
discusses the calculation of the UIM-PUM wire length required from the model based on the wire jig document and PUM drawings. These documents bring the wire length much closer to what the model fitting code found.
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