EY PLL gave an error for the fiber polarization again. The fiber trans in the wrong polarization had drifted back to 36%. I turned the controller back on and this kicked the EX polarization to 40%, and brought EY down to 25%. I then adjusted both channels and brought EY to 10% and EX to 13%.  This is similar to the behavior seen in alog 11505. I am wondering whether the controller only holds one channel when we turn it off...

I've installed the new changes made at LASTI last week here at LHO on all the BSC chambers. This installation involved model update and watchdogs C code update.

This update could be sum up in 3 main news:

1) T240 simultaneous gain switching

The analog and digital gains of the T240s are now switched simultaneously by clicking on the gain of the X channel.

2) T240s ignored when ST1-ISI isolation is off

Modify the Watch Dog code to ignore the T40s when Stage 1 isolation is off. This avoid the ISI to trip when we restore offsets on HEPI. It also avoid un-necessary trips when the ISI in damping mode.

3) T240 Monitor added

Add a T240 monitor that indicates the instruments have settled after they have been shaken. It's necessary for proper functioning of the SEI guardian and for operators as they both have no reliable means of knowing that the T240s have settled. The monitor will indicate whether the Stage 1 isolation can be turned on.

I've changed the overview MEDM screen to diplay this monitor (see pictures attached). It will do for now, but we can think of something better

For more details about the changes, see DCC #E1400214

Day Shift Summary
LVEA Laser Safe

08:30 Sprague – On site to spray outside buildings
08:48 Patrick – Going to Mid-Y to pick up parts
08:53 Justin – Shuttering PSL & ALS lightpipes
09:00 Gerardo – Soft close GV5 & GV7
09:00 Rick, Peter, Chris, & Justin – Working in H1-PSL enclosure 
09:15 Praxair – Delivery to LX-CP2 
09:28 Patrick & Thomas – Working on TSC-X 
09:29 Filiberto & Andres – Checking electrical connection to HAM6 dust monitor
09:34 Cyrus – Recovering parts from LVEA test stand
10:00 Jeff – Restart BS model
10:08 Hugh – General HEPI maintenance work in LVEA 
10:08 Andres – Moving 3IFO Vibration Absorbers to the West Bay storage racks
10:26 Betsy & Jason – Alignment setup at HAM6
10:30 Bottled water delivery
10:45 Jeff – Restarting Quad Models
11:12 Hanford on site to take water samples
11:52 Sebastien – Installing new BSC-ISI master model/MEDM screens and WD code
12:30 Gerardo – Reopen GV5 & GV7
13:22 Justin – Transition LVEA to laser hazard
13:30 Matt, Dave, Thomas, & Co – Starting CO2 laser on TCS-X
13:40 Kiwamu – Restarting ISC, ASC, h1scex, h1scey, h1asc models
14:20 Gerardo – Working in the H2-PSL enclosure
15:05 Check diode chiller water level – Level OK, no water added to system 
15:15 Craig – Working in the H2-PSL enclosure
15:55 Jeff - Restarting all SUS models
16:00 Dave – Will restart DAQ when ASC model update is complete

J. Kissel, D. Barker, J. Batch

I've finished the front-end model modifications for adding independent alignment dither paths, as per ECR E1400105. Today's focus on the BSC suspensions, i.e. the QUADs, the BSFM, and the collateral damage on the TMTS. In addition to adding the dither paths, because I was already modifying top-level, I've cleaned up the ordering of the output ports such that all HAM and BSC SUS types now spit out similar signals in the same order. This includes piping the LOCK control signal out to the top-level model, for the eventual consumption of some auxiliary calibration front end (currently still called OAF) as is already done for the HAM SUS. I've also added any missing SVN $Id$ and $HeadURL$ tags.

When finished, after noticing a peculiar error with the new end-station IPC signals, Dave and Jim reminded me that the different RFM network fabrics for the end-stations require one to add the card number to the IPC part. 
For LHO, EX = card 0, and EY = card 1. 
Last Wednesday, I had incorrectly installed all the RFM IPC parts to both end stations with cardnum=1. This resulted in the two ETMX channels having duplicate IPC numbers, and a receiving error found on the GDS_TP screen. This has now been fixed. It required clearing out all the RFM channels from ASC in the IPC file (/opt/rtcds/lho/h1/chans/ipc/H1.ipc), fixing the card number in the h1asc model, recompiling the sender (h1asc) and the two receivers (h1susetmx, h1susetmy), and a clearing of the RT NET STAT errors by hitting diag reset.

I also terminated the dither inputs to the SIXOSEM_T_STAGE_MASTER library part used in the OMCS_MASTER, which I'd forgotten to do last weekend.

I'll now begin adding this dither path to all SUS MEDM overview screens (and hopefully not uncover any bugs!).

Details:
------------
Affected models:
/opt/rtcds/userapps/release/sus/h1/models
M       h1susbs.mdl
M       h1susetmx.mdl
MM      h1susetmy.mdl
MM      h1susitmx.mdl
MM      h1susitmy.mdl
MM      h1sustmsx.mdl
 M      h1sustmsy.mdl
M       h1susomc.mdl

/opt/rtcds/userapps/release/sus/common/models/
M       BSFM_MASTER.mdl
M       TMTS_MASTER.mdl
M       QUAD_MASTER.mdl
M       OMCS_MASTER.mdl
M       SIXOSEM_F_STAGE_MASTER.mdl

Tips for Stuart:
----------------
- After an svn up of the common/models/ directory, you should only need to make changes to the top-level models.
- The TMTS and OMCS do not need any top level changes, all extra unused ports have been terminated inside the TMTS_MASTER / OMCS_MASTER block, since we know they'll never receive any dither signals.
- Pay close attention to the input and output connections at the top level, especially the lower half of them. This is the only thing you should need to change, but I've added the dither inputs and LOCK outputs in the middle of the input and output list, so most of the lower half of the connections need re-ordering.
- As mentioned above, when adding the RFM IPC to both the ASC and ETM models, be sure to call out the appropriate card number for each end station. You shouldn't need to clear out the IPC file, as long as you don't make the same card numbering error.

The ISC crew has been complaining of excessive yaw on different platforms, which some seismic people have suspicions of actuator/T240 interaction. rDr at Livingston attempted to deal with this by trading some stage 1 isi isolation (by using higher frequency blend filters) for some increased HEPI isolation using STS to HEPI sensor correction. I tried to duplicate this here, but didn't have much success, as my attached plots attempt to show. The first screen shows the T240 spectra, where red is the Ryan's (as I understand it) configuration with T750 blend on st1 Z and his senscor filter on HEPI, and probably isi stage 1 sensor correction turned off (I don't remember cause I did this Friday, and Sheila had a couple this she wanted me to try that didn't get into my notes). Blue is our current configuration with low frequency blends, level 3 isolation and isi senscor,  no HEPI senscor, with HEPI position loops on. Light green is the blue configuration with stage 1 RZ turned off. The dark green is the red configuration, but no HEPI senscor. Looking at the T240's, it looks like we don't really win with HEPI senscor.

Looking at the oplev (second picture, same color sheme (red =hepi senscor, blue = baseline, light green= RZ off)) doesn't really make this simpler, though. It looks like as far as the oplev is concerned, turning off RZ gets a little better at about .1hz (likely because we're not re-injecting actuator/T240 cross-talk?), and otherwise no big changes. Sebastien is here, so I'll get his help to see if I'm missing anything here.

Aidan, David, Heintze, Thomas, Greg.

Yesterday, to map out the response of the CO2X laser as a function of PZT voltage and temperature, we drove the PZT on the CO2X laser with a 30V amplitude, 50mHz triangle wave whilst increasing the temperature slowly. The resulting phase space is mapped out in the attached density plot. By noting when the laser mode hops (at a given length of the cavity), we mapped out lines of isolength. They have slope of 1.25mK/V - this implies that a 1.25mK change in temperature of the laser yields the equivalent length change to a 1V change in the PZT voltage.

The PZT voltage has a range of 70V. Therefore, the PZT can compensate for a change in temperature of 87.5mK, or +/- 44mK.

Contamination Control Supplies Area Reorganized:
The CC Supplies area in the entrance to LVEA has been re-organized and supplies clearly labeled. 
The heavy use supplies like wipes and foil are in the most obvious and easy to grab location. 
NOTE: The different types of pre-saturated and dry wipes are not interchangeable. General rule of thumb is only use the red pre-saturated or dry Vectra Alpha wipes on Class A parts. (Rest are for "gross cleaning" and floor mop.) The supply shelf is labeled with which one to use, if in doubt ask Jeff B. or Margot.   
The more advanced cc tools like the witness wafers, PET swipe tool, 1'' optics or Top Gun ionizers should only be used by experienced operators. If you think your work in the LVEA cleanrooms/chambers would benefit from using these, contact Jeff Bartlett or Margot Phelps first for assistance. 

Contamination Control work in HAM chambers with Jeff B.:
We are utilizing the new PET swipe tools to track surface contamination during install in HAM4-6. Yesterday Jeff B. took swipe samples of the tables in HAM4, HAM5 and HAM6. We will replicate this at the start of different in-chamber activities to track surface particulate through different install tasks. 
Also plan on chamber inspection and any necessary cleaning of these HAM chambers this week, whenever we can get in there to do so.    

Reset WD counters on HAM3, HAM4, BS, & ETMX

h1build controls account password is now the same as the workstations' controls password.

LVEA Laser Safe

Jason – Set up at HAM6 for SR2 alignment.
TCS Crew – Working on TSC-X table
Apollo – Installing bellows between BSC1/BSC3& TCS-Y/TCS-X
Gerardo - Soft close GV5 and GV7
Justin - Shutter PSL & ALS lightpipe	
Thomas & Patrick – Debugging TCS-X rotational stage 
Richard – Y-Arm ESD cabling
Rick, Peter, Chris, & Justin – H1-PSL cleaning & alignment work
Jeff – Quad & BS Front end model changes
 

Soft closed GV5 at 9:10 am, and GV7 at 9:20 am.  They are to remain soft closed for TCS viewport work at BSC1 and BSC3.

Yesterday, Patrick found HEPI tripped at ETMY. His plots showed the HEPI L4C's rung up. We've been chasing problems there for a while dealing with pier amplification. This morning, I tried bringing HEPI back up and found that the HEPI L4C's would ring after bringing HEPI and the ISI up. My attached plot shows HEPI L4C spectra for the whole chamber isolated  in dashed blue (HEPI on position loops, ISI on level 3 isolated), HEPI postion loops on, ISI damping in green and HEPI off with the ISI isolated in red. Maybe we have a problem with the HEPI loops?

no restarts reported.

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.