I have edited (uncommented existing commands)  the following scripts to enable WFS locking to come on when the MC is locked.

1) $scripts$/MC/autolockMCmain40m*

2) $scripts$/MC/mcup

3) $scripts$/MC/mcdown

4) $scripts$/MC/WFS/mcwfson

5) $scripts$/MC/WFS/mcwfsoff.

I have checked that the autolocker script switches off the mcwfs when mc loses lock and then switches it on after re-obtaining lock.

The following optics were kicked:
SRM
Wed Oct 19 04:22:53 PDT 2011
1003058589
 

I made some efforts to fix the situation of SRM but it is still bad.

The POS motion wasn't well damped. Something is wrong either (maybe both) sensing part or actuation part.

I am going to check the sensing matrix with the new free swinging spectra (#5690)

(Symptom)

 When I was trying to lock SRMI I found that the fringes observed at the AS camera didn't show spatial higher order modes, which is good.

So I thought the SRM suspension became quiet, but it actually wasn't. Because the RMS monitor of the SRM OSEMs already went to about 30 counts.

At the same time the opelev error signals were well suppressed. It means some DOFs which were insensitive to the oplev were ringing up, namely POS and SIDE.

According to the LSC error signal and the ASDC signal, I believe that the POS was going wild (although I didn't check the OSEM spectra).
 

(Some efforts)

 + Readjusted the f2a filters (see the attachment).

 + Tried to eliminate a coupling between the POS and SIDE drives by tweaking the output matrix.

    => In order to eliminate the coupling from the POS drive to SIDE sensor, I had to put a comparable factor into an element.

     So it might be possible that the POS sensor was showing the SIDE signal and vice versa.

      In order to check it I left SRM free swinging (#5690).

Sorry Kiwamu, I realized too late that you were freeswigging. Hopefully 4 hrs was enough.

 Coherence at 1 and 2-3 Hz only. He/Ne laser intensity noise is not an issue.

 Kiwamu removed the 18.3 Hz ocsillation by turning down the oplev servo gain.

[Jamie, Mirko]

Included the 'Servo' output from the D040180 in c1ioo, which I hoped would be a better measure of the MC length fluctuations. It goes into ADC6, labeled CH7 on the physical board.
Servo-output => C1:IOO-MC_SERVO. (Already present is Out1-output => C1:IOO-MC_F).
At low freq. the servo signal is about 4.5dB bigger. Both are recorded at 256Hz now which is the reason for the downward slope at about 100Hz.

I have moved the active tip tilts that we brought over from LLO to the Clean Bureau along the X arm (closest to the ETMX). There are two tip tilts and a pack of spare parts.

I have moved the active tip tilts that we brought over from LLO to the Clean Bureau along the X arm (closest to the ETMX). There are two tip tilts and a pack of spare parts.  I am sure that the tip tilts are clean, packed in the clean room at LLO.  I am not sure whether the spares are clean.  I have kept them together for now.

We need to open one of the Tip tilt packages to be sure what we have got.

Status update on dichroic mirror:

 I got the specification sheet of an aLIGO 2" dichroic mirror from Lisa.

https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=25232

This is the one from ATF. It has low loss, a high R for 1064 nm and high T for 532 nm. So it matches our needs.

Based on this sheet we may reset some of the parameters in the specification (e.g. incident angle and etc.,) and will get a quote from ATF.

We will buy 3 of them, including 1 spare. First I need to review the specification.

The SRM input matrix has been readjusted.

However still there is the unwanted coupling from the POS drive to SIDE signal and from the SIDE drive to POS signal.

			BADNESS
SRM		pit     yaw     pos     side    butt UL    0.871   0.975   1.115  -0.295   1.096   UR    1.015  -1.025   1.128  -0.140  -1.053   LR   -0.985  -0.984   0.885  -0.088   0.831   LL   -1.129   1.016   0.872  -0.243  -1.020   SD    0.084   0.061   3.534   1.000  -0.018	4.24965

[Jenne, Mirko]

We moved our one STS1 from the x-arm end to the vortex. We record the data as STS1 in c1pem @ 256Hz. x is still north-south.

JD:  This is actually an STS-2.  We just call it C1:PEM-SEIS_STS1.... to differentiate the 3 STSs that we have from one another (assuming we plug in the other two).

The ETMY  shutter can be remotely switched from medm screen POY of mechanical shutters.

The new cable from ETMY controller goes to east vertex EV-ISCT where it is connected to POY shutter hook up BNC cable.

Some of the sub-suspension screens need labels to describe what those row and column are.

I have modified all of the three RFPD interface cards to be enabled permanently.
This prevents an accidental disabling caused by a stray voltage of the logic input (or whatever),
which was reported in multiple occasions by Anamaria and me.

The logic ICs (74LS04) for buffering of the EPICS switches were removed by 14pin sockets with additional wires soldered.
The modification shorts the inputs to the second logic chips, resulting in the permanent enabling of the PD circuit.

The mechanical shutter on the Y end is now fully functional.

 It is newly named to 'C1AUX_GREEN_Y_Shutter' in the EPICS world.

It uses the same binary output channel which had been served for the POY shutter.

To change the EPICS name I edited a db file called ShutterInterLock.db, which resides in /cvs/cds/caltech/target/c1aux.

After editing the file I rebooted the c1aux machine, by telnet and the reboot command in order to make the change effective.

Also I added this new shutter on the ALS overview screen (see the attachment below)

I just relocked the PMC.  I don't know why it was unlocked.

The Stochmon had a four-way splitter, four hand-made filters and four mini-circuits ZX47-60-S+ Power Detectors.

Using the filters from our stock I have replaced the hand-made filters with the ones mentioned in Rana's elog.   The power supply solders to the ZX47-60-S+ Power Detectors were weak and came off during reassembly. And some of the handmade short SMA cables broke off at the neck.  So I changed the power supply cables and replaced all the short SMA cables with elbows.  I also removed one of the Power Detectors since there were four in the box and we need only three now.

The power supply connector on the box is illegal.  The current lab standard for  {+15, 0 , -15}  uses that connector.  So we are going to change it as soon as possible.  We need to identify a good {0, 5} lab standard and stock them.

The following were removed from the box:

The box now looks like this:

Steps remaining in installation of Stochmon:

1) Install the Newfocus 1811 PD at the IPPOS by diverting some of the power in that path

2) Connect the outputs of the Stochmon to ADC inputs in 1X2 rack.

 Again....

There looks some activity at around MC2 on Wednesday afternoon.
It caused the misalignment of MC2. Misalignment was not found in MC1/3.

It seems that the incident beam on the MC was aligned in the evening.
This increased the MC transmission but it is vibible that the spot on MC2 is shifted from the center.

We need an action on this issue tomorrow in the daytime.

[Koji / Kiwamu]

  We tried finding a possible clipping in the vertex part.

We couldn't find an obvious location of a clipping but found that the recycling gain depended on the horizontal translation of the input beam.

We need more quantitative examination and should be able to find a sweet spot, where the recycling gain is maximized.

(what we did)

  + locked the carrier-resonant PRMI.

  + with IR viewers we looked at the inside of ITMX, ITMY and BS chambers to find an obvious clipping.

    => found two suspicious bright places and both were in the ITMY chamber.

      (1) POY pick off mirror : looked like a small portion of a beam was horizontally clipped by the mirror mount but not 100% sure whether if it is the main beam or a stray beam.

      (2) The top of an OSEM cable connectors tower : although this is in the way of the SRC path and nothing to do with PRC.

 + Made a hypothesis that the POY mirror is clipping the main beam.

 + To reject/prove the hypothesis we shifted the translation of the incident beam horizontally such that more beam hits on the suspicious mirror

 + Realigned and relocked PRMI.

    => Indeed the recycling gain went down from 6 to 0.8 or so. This number roughly corresponds to a loss of about 50%.

         However the MICH fringe still showed a very nice contrast (i.e. the dark fringe was still very dark).

         Therefore our conclusion is that the POY mirror is most likely innocent.

 So I found that the NDS2 lib directory in (/ligo/apps/nds2/lib) was completely empty.  I reinstalled NDS2 and pynds, and they are now available again by default on pianosa (it should "just work", assuming you don't break your environment).

Why the NDS2 lib directory was completely empty is definitely a concern to me.  The contents of directories don't just disappear.  I can't imagine how this would happen other than someone doing it, either on purpose or accidentally.  If someone actually deleted the contents of this directory on purpose they need to speak up, explain why they did this, and come see me for a beating.

The "dataviewer" script was still setting the server to fb40m on nodus. I modified it to fb, so that this is the default when you enter "dataviewer" or "dv".

First aid kits are located close vicinity of entry doors and under circuit breaker panels.

Yesterday, I measured the transfer function of the YARM PDH box.

I tested the electronic board and couldn't find a frequency dependent behaviour. So I measured the TF again and it looked nice.

Today's nice measurement could is/was reproducible. I suppose yesterday's measurement is just an artefact.

The electronic board is modified according to Kiwamu's wiki entry http://blue.ligo-wa.caltech.edu:8000/40m/Electronics/PDH_Universal_Box

Btw. The light could be locked to the cavity for ~3min.

While trying to implement the regular yellow shell script button in MEDM for my new OAF screen, I noticed that the update snapshot stuff in all of the buttons that I checked (including IFO Align and LSC Overview) are pointing to folders in the old /cvs/cds/caltech/ area.  Also, I think some of the folders that it's looking for don't exist anymore, even in the old system.  So.  Has anyone thought about where the snapshots should live in the new world order?  Previously they were in ...../medm/c1/subsystem/ .  Maybe we should make a snapshots folder in each subsystem's medm folder, at the same level as the 'master' folder for the custom screens?  This is my current proposal.

Unless someone objects / has a better plan / knows why they're still pointing to the old place, I'll do this in the morning, and work on changing all the buttons to point to the new place.

The following directory exists. We can apply this convention to all of the models.

/cvs/cds/rtcds/caltech/c1/medm/c1lsc/snap

I am working on fixing this.  You might some strange stuff going on in the control room screens.  Pls ignore it till I am done.

  I have realigned the MC by recentering the spots on all the MC optics.  The current spot positions (in mm) are:

MC1P     MC2P     MC3P      MC1Y      MC2Y     MC3Y

0.2245    0.3364   -0.2801   -1.8891    0.1631   -1.744

Initially the lockins 2 and 5 showed very small outputs.  This was traced to the fact that we have recently switched on a 28Hz ELP filter module in the MC2 ASC filter bank which introduces an extra phase of about 75deg..  See this elog.

When the MC ASS lockins were initially setup, the phase was set with this filter module switched off.  Since quite some time has passed since the last calibration of these phases, I readjusted the phases to minimise the  Q_OUTPUT and I also adjusted the GAINs in the SIG filter banks  of all the six lockins so that their I_OUT's drop by the calibration value of -2.65 when an offset of 0.1 is introduced into the MC suspension output matrices.  Two short scripts in the $scripts$/ASS/ directory help in setting and removing these offsets.  They are called MCxoffsetOn and MCxoffsetOff.   They have to be edited appropriately to address each DoF of the MC.

The $scripts$/ASS/mcassUp script., which sets up everything to make the MC spot decentering measurement, has been edited to set these new phases and gains.  The old settings have been commented out.

I then centered the spots on the WFS sensors and the MC_TRANS QPD.  We are now ready to make the MC WFS output matrix transfer coef measurement again, but this time with the WFS loops closed.

While chatting with Jenne I learnt that some substantial amount of work had taken place yesterday around the MC2 chamber.  This was associated with the relocating of seismometers.  ref elog. 

I reiterate what is well known for quite sometime:  MC2 table is not well isolated from the ground.  And we should not approach this chamber unless absolutely necessary. I have blocked off the area around it which we should avoid.  It is a serious waste of time and effort to realign the MC each time the MC2 table decides to settle into a new position.

Steve tells me that the mild-steel frame supporting the chamber+MC2_table sits with two legs on one concrete slab while the other two legs sit on another one.   The frame is also quite weak without sufficient gussets or cross connects.  The next time we have a major shutdown we must replace this frame with a more sturdy one which sits on one slab (preferably the one on which the rest of the MC sits).

Till we improve this mounting, I suggest that we avoid that area as much as possible.

 Thinks to do before the NEXT realignment:

B,  tie 4 ancher bolts on table legs to the floor

C,  tie 4 dog clamps between table and chamber

D,  check the locked position of the 4 x 4 positioning screws

E,  check bellow protecting 4 tubes are not shorting

A,  here is the concrete  slab cut

It reminds me to check the  IFO vacuum envelope dog clamps on the chambers to floor  with torque wrench.

In order to move the emergency shut off switch in room 103 I had to turn off the 2 W Innolight laser. This job will take an hour.

 It is back on.

The image on the PMCR camera was quite assymetric and PMC output was at 80% .... upon improving the alignment I managed to push it up to 87%

The MC suspensions were not damping and the reason was traced to the empty imput matrices in the suspension controls.  This has been an issue in the past as well when the sus machine is rebooted some of the burt restore does not populate these matrices.

I ran the burtgooey and restored c1mcs.snap file.  from a couple of hours ago.

I could not improve the locking. So, I checked the transfer function of the PDH box again. The transfer function looks okay if the gain knob is <=2.0.

If the gain knob is >2.0 the 20dB step appears in the transfer function (see elog page 5713). This step is shifted to higher frequencies if the gain is

increased. The PZT drive out was not saturated at any time. Yesterday, I checked the electronic circuit with a gain of 2.0. Thus,  I couldn't find the broken

gain amplifier (AD8336). The amplifier is ordered in will arrive on Monday.

[Jenne, Jamie, Mirko]

We got the first version of the oaf code based on Matt"s code running!! :-)
Produces already data for e.g. MICH DOF. But don"t trust that. It's only 10 taps long and delay is not adjusted.

Toyed around some more with the adaptive filters.

Execution time:

nTaps    Downsampling factor     Execution time average / max in ca. 3 min [us], (480 us available)
1000     16                                110 / 150
2000     16                                280 / 340
3000     16                                380 / 470
4000     16                                Over limit

Now we are running with Downsampling 32, 4000 Taps => max 410us execution time.

I tried to desynchronize the downsampled operations of the filters of the different DOFs. That however increased execution time by about 10%. So I undid that.

Located in /opt/rtcds/caltech/c1/userapps/release/cds/common/scripts

Script 1: Diagreset.sh
Hits the diag reset buttons on the models on c1lsc and c1sus computers.

Script 2: Burtrest.sh
Restores the burt files from "today" 4am. Use a text editor if you want to change the times.

A while back we faced the problem that when we use several lockins to excite the MC degrees of freedom, their relative phase was not known.  The solution suggested was to use one oscillator and several demodulators.

I have now modified the C1IOO.mdl so that this can be implemented.  Previously we were using the MC_ASS lockins for WFS work.  I have now separated the WFS and MC_ASS structures. 

Other jobs to be done in this context are:

1) The medm screens associated with WFS lockins need to be updated with new channel names.

2) The scripts associated with both MC_ASS decentering and WFS ouput matrix determination have to be updated with the new channel names.

3) I also deleted all medm screens in the $screens$/c1ioo/ directory after copying them to $screens$/c1ioo/bak/.  After installing the new c1ioo model $screens$/c1ioo directory now contains just the automatically created screens.  All other user made screens should go into $screens$/c1ioo/master/ directory

This is a pic of the new c1ioo model:

When I installed the new model I restarted the fb between 1 and 1:30 AM PDT Oct 25, 2011

Yesterday, I had the great pleasure to solder a tiny 4 x 4 mm op amp with 16 legs (AD8336).

I figured out that the best and fastest way to do it is

1. to put solder with the soldering iron on every contact of the electronic board (top side)
2. heat the bottom side of the electronic board with a heat gun
3. use a needle to test if the solder is melted
4. if it is melted place the op amp on the electronic board
5. apply some vertical force on the op amp for proper contact and heat for 1 to 2 more minutes
6. done

I forgot to mention another change I made to the C1IOO model.

The location of the WFS global switch and the WFS_GAIN have been shifted. The switch now cuts off signals just before the WFS servo filters.

I have also added some test points just before the switch and the so that we can monitor the WFS error signals which would be unaffected even if the WFS_GAIN is changed..

I forgot to elog (bad Jamie) that I broke out the demodulator from the LOCKIN module to make a new DEMOD part:

The LOCKIN part now references this part, and the demodulator can now be used independently.  The 'LO SIN in' and 'LO COS in' should receive their input from the SIN and COS outputs of the OSCILLATOR part.

Some small fixes to the c1ioo model.

1) I edited the WFS lockin modules to make use of new library part called demod.

2) c1ioo model has been compiled and restarted.

3) fb was restarted at Tue Oct 25 18:43:55 PDT 2011

We currently have the code running for all DOFs using all witness channels. By default nothing is applied. C-Code parameters can be changed via the respective EPICS variables. Sanity checks in the C-Code make sure the code doesn't crash when nothing / zeros are fed to the code. Let's look into applying FF to one DOF only as a starting point. We start with MCL.

Remember there are two possible signals to look into MC-F and MC-Servo. See page 5695 http://nodus.ligo.caltech.edu:8080/40m/5695

Dark noise: MC-F over MC-Servo which is unconnected in this measurement:

=> At least 20dB SNR. ADC noise should not be an issue. Of course more is always better.

Coherence of seismometers to MCL:

STS1 is located at the vertex. x-axis along the x arm.
GUR1 is located at the IMC MC2 mirror. Same orientation.

=> 1. Only the x-direction has good coherence (to be expected)
     2. Only good coherence at 1.5-4Hz (huh?)

So probably other noise sources are dominating. Let's look into noise projections. Remember IMC autoalignment is off.

A quick adaptive filter run with only the GUR1 and STS1 witnesses applied only to MCL didn't really do anything. Some more thought needs to be invested into the AA and shaping filters.

Elog went nonreponsive. SSH'ed into nodus to run restart script. Elog came back ~15 minutes later.

Indeed, only GUR1_X is reasonable. Static Wiener filtering (length = 2500) of MCL with witness channels GUR_1_X, GUR_1_Y, GUR_1_Z proves your measurements.

We need to callibrate seimometers. I think that now we see velocity, not displacement. It might be useful to amplify the seimometer singal before ADC to make sure that our signal is not ADC noise.