The AOS people and Vern

HWS table has been moved into a rough position in front of HAM4 so that the buildup of that table can commence. The HWS shipment has been received from Caltech so work can commence on this table

Vern had a look at the TCSx Beckhoff controlled HWP and its issues of it not rotating correctly. Its still unfortunately not working correctly and so he has some ideas to try and they will be looked into tomorrow

We have been looking into the alignment of the polarisers, we may be seeing evidence of birefringence occurring after the first polariser (not sure what due to), but we need to do some more investigation before making any definitive statements.  

Today I spent some time working on the automation of the dither alignment using guardian.  I think this should be working OK now, we can try using it for a while and see how this goes.

We need a signal to keep the X arm on resonance when we are working with the Y arm, because the michelson signal contaminates REFL_9 when ITMY is aligned.  Today I switched the refl bias path over to using the transmitted X arm power to lock on the side of fringe.  The attached screenshot shows the settings in the LSC matrix.  Stefan had the nice suggestion of using schmidt trigger to acquire this.  The transmitted power is normalized already, so the calibration into Hz is just multiplying by the FWHM of the cavity, 84Hz., done is LSC REFL BIAS. The offset in this filter determines where we are on the fringe. 

The gain is now set to give this path a crossover with the ALS COMM signal at 35 Hz, (Kiwamu's simulations have us using 30Hz crossover for this).  The gain of this path is attached. 

CDS workstations were frozen and not accepting logins. Cyrus fixed this with a reboot of cdsfs0.

08:52 Jeff and Andres to set up dust monitors near HAM 4,5,6
09:15 Hugh to HAM4
09:24 RO in alarm, sent email to Ski
09:56 Hugh out of HAM4, HEPI is locked, doors are still on
10:24 Matt, David working on TCS HWS table
10:46 Travis heading out to LVEA test stand area, cleanup work
10:52 Email from Ski, RO is fixed
10:53 Richard into H1 diode room
11:09 Jeff looking for serial cables near HAM1, HAM2
11:16 Hugh to lock HAM4 ISI
11:57 Hugh out of HAM4, ISI is locked
12:14 I reset the WD for the BS ISI, Guardian brought it back
?     I reset the WD for ETMY HEPI
12:27 Richard to end X to look at power supply
12:31 Monthly phone test of Hanford site emergency alert system
12:35 Jeff done installing dust monitor at HAM4 at location 1
12:47 Karen to end Y to clean
12:59 I ran the script to isolate ETMY HEPI to level 1
13:34 I restarted the video4 computer and the FOMs
13:37 Justin transitioned the LVEA to laser HAZARD
13:37 Karen back from end Y
13:42 Vern, Matt and David working on TCS rotation stage in LVEA
13:51 I reset the WD for ETMY HEPI. I ran the script to isolate ETMY HEPI to level 1
13:56 Jeff installed a dust monitor at location 6 inside the clean room over HAM 6
14:05 Richard to end X to look at high voltage supply
14:58 Richard back from end X, working on dust monitor in diode room

(Daniel, Alexa)

Today we measured the EY cavity length. We repeated the technique described in alog 9626. We ran the measurement three times. And got the following results:

where the offset refers to the common offset in the PDH REFL servo board. The results of each attempt is plotted respectively. (I have also attached the data and the matlab script that creates the plots and gives the values listed in the above table). This gives:

Zero crossing freq = 24.992280MHz ± 5Hz

EY Arm Cavity Length = 3994.4691m ± .7mm

If we compare this to the result for EX, we find that the cavity lengths differ by 1 ± 1mm. 

The ESD was non-functional this morning when we tried to operate it.  I went down to EX and found the negative supply in the off state (indicating a trip probably not someone shutting it off).  Turned it on went out to ESD drive to turn it on.  As soon as I turned on ESD amp the Neg. Power supply tripped off.  Went back out to power supply to see if I had not set the over current.  The unit was off again. This time it would not turn on.  Took this opportunity to swap out bot the positive and negative supplies.  The positive due to problems noted last week with sync. and the neg. do to this failure.  Power the system back up.  The system once again was in an odd state all of the supplies present but sitting at a neg rail.  I verified voltage everything was properly connected but still at a neg. rail.  This was the same state the unit was in on Friday when I had Kiwamu come out to help.  I disconnected the DAC inputs and reconnected them.  Everything came up just fine.  This is a very troubling state as the DAC was not sending out a voltage and the unit was behaving as though it was.

The unit is now running and seems to be working again.

Took PET swipe samples:
 (1). Center of HAM5 ISI from the north side door.
 (2). End of HAM6 ISI near east door. 
 (3). Just south of Center of HSM4 ISI from the south door.  

Added two new dust monitors to cover the installation and alignment work at HAMs 4,5 & 6. 

   Loc #1 is at the South side door of HAM4.
   Loc #6 is at the East side door of HAM6. 

Plot attached.

I updated the H1ECATY1PLC2 xml file with the required manual setting to be compatible with the autolockers, and turned it on.

All of the original four CSD prototype targets (H1ECATX1PLC2 H1ECATY1PLC2 H1ISCEX H1ISCEY) are now running.

I also stood up the infrastructure for the CSD for H1LSC and H1LSCAUX - this was literally just running the commands:

./createCSD H1LSC lsc /ligo/cds/lho/h1/burt/2014/04/28/12:00/h1lscepics.snap
./createCSD H1LSCAUX lsc /ligo/cds/lho/h1/burt/2014/04/28/12:00/h1lscauxepics.snap

followed by adding the systems to the CSD main screen.

Plot attached.

(Daniel, Alexa)

We have placed the broken demod from EY (SN S1000774) in the EE shop. We replaced it with a spare from MY (SN S1000779). We had also found a spare demod (SN100781) floating around at EY and have returned it to MY.

Plots attached.

The lockers were very smooth, no issues there.  The Optical Table translated from 15 to 35um depending on dof, the tilts were 65 and 90 urads and the Yaw shifted <20urads CW.

Attached are a couple trend plots to show the history of the HAM4 alignment.
HAM4 ISI Optical Table was aligned late January and the Actuators finally attached Early March.  The first plot shows the electronics coming on 7 March and the zeroing of the IPS & Locking 11March.  The doors were installed then to work on HAM5.  The Pier Pods were turned off briefly towards the end of March.
The second plot just overlaps the first plot by a day or so and switches to the Cartesian basis.  The matrices were loaded 28 March (aLog 11078) making the Cartesian units valid.
Pretty quite after that until 11/12 April when TFs De-Stress the system and things settle into a new position (more steady/long lasting?--Who knows)

Bottom line--The main thing is the 80 urads of CCW yaw.  THis of couse won't take much for SUS to correct during up coming alignment but the position loops are still not working.  But, -80urads will be the HEPI 'zero' for HAM4 Rz.

Aidan, Thomas, Greg, Dave H, Matt H.

We worked on getting the polarizers aligned after the half wave plate on Friday. Despite our best efforts, we could get an extinction ratio better than 500:1 (so 20mW off the polarizers for 10W into them). We achieved a lot better than this at LLO (~ 250,000:1). We're going to revisit the alignment of the first polarizer after the laser (which is supposed to clean up the polarization of the laser).

We got several MOTOR ERROR warnings whilst using the rotation stage on Friday which required the Beckhoff system to be reset each time. Also, the rotation stage is now only turning in a range of about 5 degrees or so. Vern is looking into this today.

IMTX triped (GS13s and T240s) this morning, I don't know why. ( first attached plot)

I had some trouble brining it back, which might be because we paused the guardian and used the command scripts for Jim's measurement on friday.  I followed Jamie's instructions from alog 11246, this didn't work verry well.  At first the indivdual stage guaridans compalined about gains that weren't set corectly (all the ISO gains were set to 0)  I paused everyone, fixed the gains, and unpaused again.  Stage 1 guardian complained about filters which weren't set correctly (which was true, they weren't set correctly.) and stage 2 went ahead and tried to isolate, then the watchdog tripped. 

I paused everyone again, set the fitlers the way the guardian was asking for, and unpaused again.  One more time stage 2 tripped, which is the second plot attached.  after reseting this one last time I think that the gaurdian has suceeded in bringing it back.

Sheila, Alexa, Stefan, Daniel

Attached is a spectrum, in Hz/rt Hz, of the PLL control singals for ALS diff and COMM.  This looks simliar to what was measured at Livingston last week.

We made changes to the LSC model to route these control signals into the input matrix to allow us to lock ALS DIFF.