model restarts logged for Tue 22/Apr/2014
2014_04_22 09:14 h1dc0
2014_04_22 09:15 h1broadcast0
2014_04_22 09:15 h1fw0
2014_04_22 09:15 h1fw1
2014_04_22 09:15 h1nds1
2014_04_22 09:16 h1nds0
2014_04_22 09:29 h1nds1
2014_04_22 09:40 h1fw1
2014_04_22 09:53 h1fw1
2014_04_22 10:10 h1broadcast0
2014_04_22 10:16 h1broadcast0

no unexpected restarts.

There is a desire to have Spool cameras looking at the ITMs--One to show only Green light & one to show only IR light.  Currently we only have one camera looking at the ITMs, we want to have (2) GigE Digital cameras with proper filters to look at the ITMs.  This is to aid in alignment with the Green & IR lasers.

I received filters (from MidOpt Systems) this afternoon and measured transmission of Green & IR light through each of the filters.  I had the laser point at an Ophir Power Meter, noted power, then placed filter in front of power meter and noted power.  Here are the results:

IR laser set to ~0.474W

Transmission through the filters = power with filter (w/o filter)

• BP550-62 = 3.5 mW (0.474 W)
• LP550-62 = 0.448 W (0.492 W)
• BN532-62 = 0.390 W (0.493 W)
• LP920-62 = 0.475 W (0.487 W)
• Hoya R72 = 0.472 W (0.501 W)

Green laser set to ~100.5 mW

Transmission through the filters = power with filter (w/o filter)

• BP550-62 = 79.8 mW (101.1 mW)
• LP550-62 = 7.14 mW (100.9 mW)
• BN532-62 = 75.8 mW (101.2 mW)
• LP920-62 = 7.12 mW (100.6 mW)
• Hoya R72 = 6.83 mW (100.6 mW)

The links for the filters above give info on them and Transmission v. Wavelength charts.  The Filters are M62 (62mm thread).  They can be screwed on the output of our Butterfly electric zoom lens.  These lens would then be installed on our Digital GigE cameras (with a beam expander in between?). 

Next thing to be done would be to see if any of these filters will work.

A wiki showing information for cameras is on the H1 Camera Page.

Fixed (not that they were "broken") the unsoldered connectors.

PDH CM board was modified so that it should be identical to X arm.

For some reason we found that the demod output for the PDH was railed at 10V (or was that -10V?). LO and PDH RF were both OK, but the I output as well as IMON were both railed. The demod chassis has two I/Q demod and the unused one was still alive, so we just switched. The broken one is still left there.

Though the only Hartman path optic on the table was a pickoff for that path, I installed another pickoff downstream of the first pickoff and directed the beam to REFLB diode so we have something to monitor.

We started locking the arm again. But the CM board output to VCO would rail really quickly. We might have to enable LSC path to offload the VCO.

When locked, the arm transmission is not maximized, we're probably talking about 10% or so smaller transmission than the true peak. Looking on the oscilloscope, it's clear that the PDH error signal is not symmetric around the 00 carrier transmission when locked. We swapped the RF source with IFR generator and changed the modulation frequency +-30kHz or so (transverse mode spacing is 28.59kHz for Y arm) with a few kHz step at a time. We were able to observe clear steps in the transmission when we changed the modulation frequency, but this was not a big effect, we were never able to fix the asymmetry of the PDH error around the lock point. In the end we changed the oscillator back to the original.

Since it seems like we have a relatively large 20 mode, one thing to try is to improve the mode matching and see what happens.

This morning Pablo and I worked on getting (separate) cameras on both of the arm transmitted beams on ISCT1. We approximately followed the layout posted in llo alog 12198

To do this we had to add a lens in the Y arm path before the pick off for a camera, we used a Laser Optic +50mm roc. We used R=10% beam splitters for the pick offs for the cameras. We used analog cameras temporarily.  I borrowed the POP cable (labeled POD) for the X arm trans camera, and used the REFL_PD camera that we have been using for the X+Y arms for the Y arm.  The Y arm spot is on a baffle, the camera has a lens and is focused on the spot on the baffle, this makes a nicer image where we can clearly see the different cavity modes.  We will do this for the X arm camera as well once we find a good lens. 

Once we saw that both arms had nice IR flashes, I worked on aligning the diff beatnote.  On the diff BBPD we have about 126 uW from the Y arm when it is locked and about 40uW from the X arm.  We get -30dBm on the beatnote, (at 160MHz) I din't really try to optimize this since the cavity keeps dropping out of lock making it difficult to adjust.

[Sheila Arnaud]
EY oplev signal got somehow really noisy during the afternoon. It doesn't seem to be seimic noise. It is not clear why, but we should check this when possible.
Attached is a comparison spectra of EY oplev pitch at two different times this afternoon, with ISI isolated. Pink curve is the most recent one.

(Keita, Alexa)

A more in depth alog will be posted later about what we did today at EY. For now I have attached the data for the OLTF we measured (mag --> 122.txt, phase --> 123.txt). The UGF was about 2.3kHz with a phase margin of a little less than 60 deg. The phase shifter was adjusted to 23ns. The PDH REFL servo board settings were as follows:

• Input 1 gain: -7dB
• Input 1 pol: POS
• Common Comp: ON
• Boost 1: ON
• Boost 2: ON (same as boost 1 now)
• Fast gain: 0dB
• Fast pol: POS
• Slow option: enabled

We also measured the peak to peak of the PDH error signal and found it to be ~816mVpp.

Some updates to the Control State Definition code:

- Updated the compilation to also read in the autoBurt.req file. If not listed in the xml file, all channels in the autoBurt.req file (except read-only and alarm-relates channels) will now be enforced to zero.
- Updated the medm generator. It's now python code, and parses the xml directly. This way external states also show up on the screen.
- Added links to the documentation on the medm screen.

Modified the output stages of the ETM UIM coil drivers, to give a factor of 4 more range per ECR E1400164.

All four channels of each unit were modified as followed:
R10 & R15 were changed to 2.2K Ohm
R5  & R23 were changed to 2.0K Ohm 

Unit from EX - S0900303
Unit from EY - S0900304

No touching.

- PSL went down today and Sheila brought it back up, diffracted power is a bit low in the ISS.

- Sheila to ISCT1 to work on cameras 9:00 AM PT

- Fil to EX and EY 9:10 AM PT

- Richard and Peter to EY to work on ESD 9:15 AM PT

- TCS Aussie Crew: Aidan, Matt, David working on CO2X and CO2Y tables, turning on laser.

- Mark(Apollo) going to EX and EY to look for tools 11:15 AM PT

- Gerardo and Mark Barton to H2 PSL Enclosure

- Corey to HAM6 bay to turn on laser for camera work

- Ken running conduit from CO2X table to H1 chiller pods

- Apollo breaking bolts at HAM5&6, Jeff Bartlett taking dust counts, temporarily disabling dust monitor 15

- Hugo updating MEDM screens remotely from Stanford

- Jonathan working on OS upgrade on SVN and Bugzilla

- Filaberto working on output stages of the ETM UIM coil drivers.

- Guardian machine reboot, IMC remained locked in that time during entire reboot and came back in a locked state!

- Cleared HEPI L4C stat monitors.

Scott, and I finished what we could of the actuator sub assemblies. There are a few parts that are currently MIA that will effect the last unit. 

After lunch Jim and Hugh came to the rescue and aided with the installation of unit 2's horizontal GS-13's. 

The HEPI overview screens were not displaying the ISI DAC outputs correctly. This was fixed on the HEPI overview screen template, and the update was ported here at LHO.

The update required to add the ISI_DAC macro substitution to the macro substitution text files of HEPI, which was done too. The new version of those files was committed to the svn -r7772

Details about the content of the update can be found in SEI aLOG #453

Work was performed under WP 4588, which can now be closed. 

I removed 1,647 SUS channels from the conlog include file. These channels were unmonitored and assumed to no longer exist after model changes. I regenerated the conlog pv_list using this updated include list.

The channel counts are now:
all: 118787
monitored: 118787
unmonitored: 0

We are redefining what the EPICS audible alarm system, reducing it to only include alarms which are not accessible via other data channels and which need URGENT operator/staff attention. To this end I have removed the CDS and PSL alarms from the operator alarm station. This leaves the VACUUM, FMCS, DUST and SOFTWARE_WATCHDOG alarms in place. I had re-worked the Software Watchdog alarms last week to remove duplicate and spurious reporting of these alarms.

Coupled with this is the requirement that urgent alarms also send text messages to cell phones to cover times when the operator is not on duty.

Daniel would like non-urgent alarms to be reported by a new system which filters the data before presenting it to the operator. Currently alarm status is available on MEDM screens which the operator checks regularly.

We had ETMX running Tcrappy and sensor correction.  We don't know why it tripped.

Now I will put it back to Tbetter with sensor correction because the microseism has come back down.

I noticed that the fiber polarization (in wrong pol) at EY had drifted back up to 32%. The normal procedure for this is to turn the controller back on and adjust the settings; this never seemed to disturb anything. When I turned the controller on it made a funny noise (it sounded like the waveplates were moving rapidly), and BOTH EX and EY polarizations got drastically worse. I manually adjusted both polarizations, and they are back down now. I turned the box off. I did not want to turn the box back on. Clearly this is not good...