(Eric A., Corey G.)

This morning we addressed our Sensors.  Last week we found that the physically measured gap distance for our V3 was smaller than everyone else (it was around 0.074").  Fabrice requested we set this gap to 0.080" and then adjust the pot at the Mini-Rack thus electronically re-zeroing this Sensor to a good gap.

Before this work was done, we disconnected from Flange Feedthroughs and worked with the nice/expensive feedthroughs which were installed on our Interface board (we checked Sensor values after this swap, and there was no noticeable change, so we proceded).

We now have some teflon shims which are 0.080".  We will use these shims for checking that our gaps are at the nominal value of 0.080".  

After V3 was adjusted, went through the Testing Steps referenced in our Testing Document (i.e. T1000329).

Step 4 - Set Up Sensor Gaps
Here are the Sensor values (in counts) obtained with the locked table:  (mean / Std Dev)

V1:  -0.069  / 1.1
H1:  -0.052  / 0.8
V2:  +0.257  / 1.6
H2:  +0.334  / 0.7
V3:  +0.170  / 1.8
H3:  -0.235  / 1.0

*We did not do measurements with one Mini-rack on at a time since we've show that linking the Mini-Racks together has addressed our cross talk issue.

Step 5 - Measure the Sensor Gap
Here we were able to use our 0.080" teflon shim on all of our Sensors.  The shim was a tight fit, but it was consistent and was able to make it in the gap with no problem.  So, we'll say All of our measured Sensor Gaps are 0.080".


Step 6 Check Sensor Gaps After Release
Here are the locked/unlocked Sensor values (counts):  (LOCKED /UNLOCKED in counts)

V1:  -69 / -62
V2:  -52 / -223
V3:  257 / -540
H1:  334 / -93
H2:  170 / -782
H3:  -235 / -830

Step 7 Range of Motion Test #1
Here we had two people push up & push down on the system to its limits, and we noted Sensor (counts) & Dial Indicator values (thousandths of an inch).  We only did this for vertical motions.

SENSORS:  
V1:  20631 / -19327
V2:  18714 / -18139
V3:  19631 / -20730

DIAL INDICATORS:
A:  24 / -23
B:  24 / -24
C:  25 / -23.5
D:  24.5 / -21.5

Step 8 & 9 Position Sensor & GS13 Power Spectra
Went ahead and ran power spectra for our Capacitive Position Sensors & GS13's with the Table locked & unlocked.  This data is saved in the repository at:

/opt/svncommon/seisvn/seismic/HAM-ISI/X1/Data/unit_2/dtt/20100810_lock_unlocksensor_spectra.xml (and also saved GS13 & CPS individual files).

These files have been added & committed to the svn.


Step 11.1 - Actuator Sign
This is a fairly simple test (there's no "requirements" or pass/fail in the document for this).  Regardless, we moved collocated Actuators and their respective Sensors moved with the right sign.

Step 11.1 - Range of Motion Local Drive
Here we put in huge 30,000 count DAMP offsets and watched V & H Sensors.  Here the results (in counts):


V1 (+/-30k count offset)
V1:  20088 / -19439
V2:  -1989 / -353
V3:  -8540 / 8685

V2
V1:  -6256 / 4818
V2:  26420 / -24717
V3:  -8118 / 7165

V3
V1:  6022 / -6601
V2:  -15782 / 152001
V3:  21595 / -22703

H1
H1:  23863 / -24419
H2:  15560 / -17650
H3:  16362 / -17558

H2
H1:  17716 / -16627
H2:  23311 / -24489
H3:  17221 / -16864

H3
H1:  13668 / -13163
H2:  13626 / -13296
H3:  25018 / -25206

Step 12 Vertical Sensor Calibration

Going with +/-20k moves with the Vertical Actuators, we looked at Dial Indicators & Sensors on Dataviewer to calculate the Calibration.  We are given the ADC Sensor Calibration of 1638 counts/V.  Here are averaged values we obtained:

Dial Indicators:  38.1 mil
Sensors:  31753 counts

This yields a vertical sensitivity of:  31753 / 38.1 = 833 counts/mil

or 833 count/mil * 1/1638 V/count = 0.509 V/mil
or 2500 nm/mil * 1/833 mil/count = 30.5 nm/count

In addition to the power spectra, I've also attached part of the document which we completed today, if you wanted to see the actual numbers we wrote.  I'm leaving this with Eric, so he can continue other testing work while I have shifts in the Control Room over the next two days.

For Hanford's test stand, rebooted dtsfd0, dtsfe2, dtsfe3 because file systems were not mounted properly during power up after power fail.

Main results of the HAM-ISI tests

- Position sensors
    o The two satellite boxes are now synchronized – No crosstalk 
    o Measured sensor sensitivity = 840counts/mil
- Measured vertical spring constant =  2.491e5N/m (2.62% from nominal value)
- Measurement of the Local to Local transfer functions. No particular issues except on V1 geophone transfer function. Below 1 Hz, magnitude is about 25% higher than the other transfer functions and the Q at 1Hz is also lower. We didn’t notice any difference on CPS transfer function. V1 Geophone might be guilty. Note: No electronic correction on plots presented (1 zero @ 10 Hz - 1 pole @ 50 Hz in the new GS13 interface chassis).
- Measurement of the Modal to Modal transfer functions. 
   o RY geophone transfer function is not clean in the section between 500mHz and 5Hz. We messed up when we defined the magnitude of the excitation. The drive was too strong. The saturation counter indicates that RY Geophone signal saturates. We haven’t redone that measurement (HAM is unplugged now – New floor next week).
   o We can also notice that signals on position sensors in the Cartesian basis are out of Phase. Adding a sign in DISP2CEN matrix in make_HAMX1_projections_100709 will fix that. CONT2ACT and GEO2CEN look good.
- We installed the damping loops using HAM6 filters. No problem of instability. Check out power spectrums when all damping loops are engaged.

(Corey, Hugh, Jim, Mitch)
V3 Sensor Target, V1 Sensor Body swapped, and Gaps Re-set
After what happened with V3, it was decided to inspect the target.  After inspection, Hugh decided to swap the Target out (too many scratches on its surface for use).  While doing the V3 work, a spare Target Body arrived for our V1, so V1 & V3 were both worked on and had their gaps re-set.

Sensor Gaps:  V3 Has Small Gap
Last night I used our teflon shim stock to measure the gap of V1 & V3.  Here's an updated list of our gaps (for other Sensors, using values from yesterday):

V1:  0.081"
H1:  0.083"
V2:  0.082"
H2:  0.083"
V3:  0.072"
H3:  0.083"

So, V3 is obviously different from the bunch.  We'll need to see what to do about this.  I'd imagine possibilities are:  live with it, electronically change the zero for V3 on the Mini-Rack, or swapping the Target out.

Position Sensor Power Spectra
With the table locked, took a few power spectra as we did with Unit#1.  So, Unit#2 is different in that we have "linked" Mini-Racks for the Position Sensors (they are now tied together with a cable); this was needed to get rid of the 0.3Hz crosstalk we saw on Unit#1.  

With both Mini-Racks powered ON we had no 0.3Hz noise.  To follow Testing instructions, I went ahead and ran two more power spectra (where only one rack was powered at a time).  When the Rack#1 (which powers H1V1H2V2) was only powered ON, H1V1H2V2 looked real and H3V3 looked like noise.  When Rack#2 was only powered ON, all the Sensors looked like noise; you could sot of see something from H3 & V3, but it was not very discernable.  As for the H3 & V3 counts, their value went up from a few hundred counts to 4000 counts.  So, it looks like with linked racks, you can't see Rack#2.  (the first attachment shows spectra with BOTH Mini-Racks ON, and with Rack #1 ON....the Rack#2 ON measurement wasn't interesting) 

The second plot I'm posting is the spectra for the Position Sensors & GS13s with the table Locked & Unlocked.

The third plot is a comparison in spectra of the GS13's between Unit#1 & Unit#2.

These data files have been put on the svn at:
/opt/svncommon/seisvn/seismic/HAM-ISI/X1/Data/unit_2/dtt

(Corey, Jim, Mitch)

Vertical Sensors Installed On Unit #2
On Unit#1, it was discovered the mirrored surfaces for one of the Capacitive Displacement Sensors (CPSs) was scratched.  We grabbed spare hardware to be used for Unit#2 to get us through Unit#1.   Unfortunately, the Sensor Target Body is the one part we didn't have a spare of.  Hoped to have another one in hand late last week, but as of Tuesday we still hadn't received it, so we opted to use the damaged (yet serviceable) Target body so we could get Unit#2 available for testing.  All Vertical Sensors were installed.  The bad target body is on V1:  we'll want to swap it out when we get another Target Body part.

Pair of CPS Mini-Racks Powered ON (& Connected Together), and Gaps Set

Mini racks were connected to each other with the cable/connections & were both powered on.  Since all the CPS Targets were pulled back (huge gap), we saw that V1,H1,V2, & H2 were railed at +32k.  V3 & H3 were at zero (we saw this on Unit#1); they went to "real" values when the Target was close enough to the Sensor Head.

With the table locked, the Sensor gaps were set to under +/- 100 counts.  Note:  These values can change up to a few 100 counts due to the ~2" slop in the locked Lockers, so don't spend too much time getting gaps right at zero.

Not posting gap values here, because of what was discovered later....

Access Walls Installed, and Unit#2 Balanced & Level Checked
After the Access Walls were installed the Dial Indicators were set to zero (with locked table).  The table was then unlocked and the table was balanced.  The table had already been set fairly close to level weeks ago, so only small moves were needed.  The level of the table, as told by the Dial Indicators was:

A:  0.000"
B:  +0.0005" (this means it's low)
C:  0.000"
D:  0.000"

Pretty darn good!!

Checking Sensor Gaps With Teflon Shims
From the first gap check, it was clear our gaps were big.  Here's what we had:  (all +/- 0.003")

V1:  0.096"
H1:  0.094"
V2:  0.096"
H2:  0.094"
V3:  0.100"
H3:  0.090"

QUESTION:  (1)Switch back to the "real" feedthroughs" or (2) set gaps to 0.080" and set new zeroes on mini-racks??

Flange Feedthroughs Used & Gaps Set Again
I had thought we had installed some new & better BNC feedthroughs on our Interface Plate, but maybe something happened to them after they were cleaned.  Since I found the "real" flange feedthroughs, I opted to employ them again.  

[I wired them up such that, when looking at the "dirty side", the top connection is V1, and then incremented up clockwise--same for the H's as well]

Sure enough, with these new feedthroughs, all the counts went up to around 10,000 (meaning the gaps needed to get smaller.  Here are the new values:

Gaps (counts) set with a locked table:  (Offset / Std Dev)

V1:  46  /  1.5
H1:  21 /  0.7
V2:  -55 /  1.5
H2:  -36  /  0.8
V3:  43  /  1.5
H3:  -76  /  0.7

Gaps Measured with teflon shims (all +/- 0.003")

V1:  0.082"
H1:  0.083"
V2:  0.082"
H2:  0.083"
V3:  0.077"
H3:  0.083"

How does this sound?  Are we sure it's a feedthrough issue?  Are we happy where the zeroes are set on the Mini-Racks?

V3 Target Contacted Sensor Head
While finishing up setting the V3 gap, I accidentally loosened the Collar too much and the Target dropped down on to the Sensor Head.  It was a straight drop.  There was no rotation, and I immediately pulled it all the way up, and inspected the Target as best as I could.  I could see a few minor scratches, but they mainly looked like they were on the outer edge.  There were some particles also observed.  The biggest feature was a "dried liquid stain" sort of near the middle.  Since there wasn't anything huge in the middle, I opted to continue with setting the gap.  

I took some pictures, so please check them out.  Any suggestions on whether it's ok to live with this situation?  Otherwise, I say we should just proceed and just remember that this happened (in case this Sensor gives questionable performance in the future).

Speaking of things to remember, we also have to remember to swap out the V1 Sensor Target at some point for a good Sensor Target Body (we should get one from LLO on Wed afternoon).

Attached are some close-up photos of the V3 Sensor Target.  In some of them you will notice the "dried liquid spot" which is fingerprint size and near one of the bolt heads.

Reconfigured QTS DAQ, added all the test stand's epics channels
to the DAQ. 

Created the /cvs/cds/llo/chans/daq/L1EDCU.ini file, added this
path to the /cvs/cds/llo/target/fb/master file, restarted
the DAQ.

Frame size has increased from 3.2MB to 6.8MB (per 16 sec frame).
This will not cause any disk filling errors, /frames is currently
only 16% utilized, so estimated to top out at approx 33%.

Installed an autoburt on bscteststand. Runs as a controls cronjob
at one minute past each hour. Uses the l1qtsepics/autoBurt.req file,
and writes to the /data/autoburt area. Same code as runs on the
seiteststand (slightly more simple since there are no X-FILES)

This test shows that the config changes do work in allowing larger images.  This is an image that Corey tried to post yesterday, but had to resize and post a smaller version.

I will be restarting the alog webserver between 10:00am and 10:15am Pacific on Tuesday 2 Aug 2010.

Please save your entries before that.  This is to change a setting to allow larger images (2MB-10MB) to be uploaded as attachments.

(Eric A., Jodi F., Corey G., Hugh R., Mitch R., Jim W.)

Last Friday (8/30/10), the seismic team boxed up the first Advanced LIGO HAM-ISI (Unit #1).  This endeavor went smoothly.  The Unit#1 Box remains in the Staging Bldg in the open area outside of the cleanrooms (it will be moved out when we receive our new powerful forklift which will be able to haul it up the "hill".  It will then be stored in the Vacuum Prep Warehouse.

Action photos are attached.

I have added and committed plots in .fig and .pdf formats of the Transfer Functions for both the co-located(L2L) and IFO coordinate (M2M) basis.  I edited some of the original scripts used to plot these (traditionally titled 'TFanalyze') and added a few tweaks to save plots in both formats. They also concatenate the data such that various parameters in the 'TFcollect' scripts can be tracked easily and data plotted without too much editing of the analysis scripts.  The plots are located in the repository in:
'~seismic/HAM-ISI/X1/Data/unit_1/Figures/'

The plots are of the L2L TFs from July 04 and July 13 with bandwidths from 0.025-800Hz and 0.05-50Hz, respectively. Also, the M2M plots are from the same dates and bandwidths.

The scripts are located in the repository at:
'~/seismic/HAM-ISI/X1/Scripts/DataAnalysis/unit_1/'

The new scripts:
TFanalyze_100704_L2L_0p025to800hz.m
TFanalyze_100713_L2L.m
TFanalyze_100704_M2M_0p025to800hz.m
TFanalyze_100713_M2M.m

I plan on moving these over as templates to the other unit_x folders. 

Also, I cleaned up the structure of the repository a bit. Now, under the '~/Scripts/' directory, we have separate folders for the assemblies' (units) 'DataCollection' and 'DataAnalysis' folders. So now unit_1's DataCollection folder is in the path '/seismic/HAM-ISI/X1/Scripts/DataAnalysis/unit_1/'.  Same for '~DataAnalysis/'. 

The '~/seismic/HAM-ISI/X1/Data/' folder also has this structure.

This problem is still a mystery. Usually dtt "test timed out"
problems mean that the system clock and the daq clock are off
by several seconds or more. In this case the dtt and daq are
running on the same machine, and the system clock was spot on!

Previously when I had to correct the bscteststand clock, I had
the restart the daqd to pacify dtt. So today, I just restarted
daqd and it did the trick, but the clock was good all along!

I'm monitoring the clock corrections (done by cronjob) in the file
/var/tmp/timecorrections/log.txt
Perhaps the local quartz clock is having aging problems (battery failure)?

With Michael Landry's help, we loaded Brett's filter file into /cvs/cds/llo/chans/L1QTS.txt (Brett's file is saved as M1SUS.txt.eg).  Loading Coefficients appears to have loaded filters with appropriate names which correspond to the file.  (Note that the file structure needs a little work!)

After a DAQ reboot by Dave to clear "Test Timed Out" errors on DTT, we checked that we were able to inject excitations through the awggui and run transfer functions.  

We can now do some filter checks and run a gamut of TFs.

I've created a program called system_check which
checks all the front end processes are running correctly.
It also checks for duplication.


[controls@seiteststand scripts]$ system_check 
Checking setup_shmem.rtl g1x01 g1isiham ... pid = 5732
Checking g1x01epics ... pid = 4994
Checking g1x01fe.rtl ... pid = 5022
Checking awgtpman -s g1x01 ... pid = 5025
Checking g1isihamepics ... pid = 5249
Checking g1isihamfe.rtl ... pid = 5283
Checking awgtpman -s g1isiham ... pid = 5288
Checking daqd ... pid = 5418
Checking nds ... pid = 19919

During one of Fabrice's final measurements on our Unit#1 Assy, it was noticed that the V2 GS13 appeared to have a gain of 2 lower than everyone else.  We wanted to check this out.

Today, the Seismic Team finished moving all the GS13's from Unit#1 to Unit#2.  Today, I ran power spectra looking at the GS13's in various states.  [See attached plots]

Meas UL:  This was with Unit #2 Locked.  Here V2 looks to be ok (if anything it seems bigger than everyone else (in contrast to the Meas LL below).

Meas LL:  This was an old measurement from a locked Unit #1.  Here may be the gain of 2 less on the V2 GS13.

Meas UR:  Here Unit#2 was UNLOCKED.  Everything looks normal here.  All the H's look similar and the V's look similar.

Meas LR:  The H2/V2 cable was swapped with the H3/V3 cable (Unit#2 is locked).  Nobody looks glaringly different on this plot.

The DTT data taken for this measurement is available for your perusal here:

/opt/svncommon/seisvn/seismic/HAM-ISI/X1/Data/unit_2/dtt/20100729_geo_V2check.xml

DB and CG

The seiteststand was not running all of its required processes,
all the g1x01 were missing. We did a killg1x01 and killg1isiham to cleanly
remove all processes, and then started g1x01 and g1isiham in that order.

Now that we've completed testing on HAM-ISI  Assy #1, we wanted to update our transformation matrices to the more accepted canon (Jeff K. made a new matlab script to generate these matrices which include Celine's work that include the L4Cs among other things).  Jeff G. loaded these briefly a couple of weeks ago, but we reverted to older scripts since we were still in the midst of Unit#1 testing; see his elog for the specifics on the files used & an overall explanation.

Attached are the BEFORE/AFTER values for these matrices.  Now, the new script matrix yields values to 12 sig figs, but EPICS rounds these values to 5 sig figs when they are loaded into our actual/medm matrices.

Noticeably Different CONT2ACT Matrix
The DISP2CEN & GEO2CEN matrices look fairly identical before and after this update.  The noticeable change is with the CONT2ACT matrix.  For this matrix, we have values at different locations and also sign changes.  During the Assy #2 testing, we'll need to confirm that our sign convention is obeyed due to this matrix change.