Alastair & Greg

On Saturyday we finished with the alignment on the Y-arm table and made an off-table projection of the beam to check the size and shape.  Photo of the bench is attached.  The visible laser was aligned to the CP and the CO2 laser coaligned to the visible laser.  It should all be ready for testing on the CP now.

Some notes:

There are a few things still not in their final configuration.  Firstly we need to fab a housing for the FLIR camera to match the X-arm one.  Then the camera needs installed on the bench.  We also need to install the IR sensor on the viewport before the system is run long-term unattended.  The laser had a problem with its RF driver and we swapped in a spare but were missing power connectors (5pin 40A connec) so at the moment the laser is running on a Sorensen next to the table.  The connectors are ordered.  The mask is mounted in its flipper mirror but the flipper is not connected up yet.  The flipper also needs the up/down sensor.  And we still need to put in the second flipper with the annular heating mask.

Data from this table:  Will add this once I locate my notebook, but the following was measured:

Polarizers 2 & 3 extinction ratios measured: 

Power meter used to calibrate output power to CP as a function of rotation stage (1/2 wave plate) angle :

QPDs are installed and aligned.  Each quadrant calibrated for power and center position measured.  We'll need to decide if we want to calibrate for position or use the values from the X-table where the QPDs are mounted on translation stages.  Calibration data: 

Since it seems like a cumbersome job to walk the beam on PR2, I calculated the necessary combination of optics to walk the beam on PR2 without affecting the beam position and angle on BS and ITMs. I put this combination in INP2 of the WFS output matrix (as INP1 is being experimented for WFS).

You should be able to, say, give INP2 WFS filter an offset to manually walk the beam, and/or you should be able to route one of the POP sled QPD signal to it to servo the beam position on PR2.

Changed default print driver for matlab to psc2 to enable color printing on the control room printer.  Was originally ps2.

I'm attempting two jobs on opsws3.  Please take it easy on this work station but I won't say don't use it.

Please reenable any watchdog trips on the HEPI, ISI, and SUS.

My tf on Sat at ITMX went poorly, so I will be taking a new tf ITMX, starting at midnight tonight. Re-taking tf's on ETMX, because I have the opportunity, and I haven't taken good data there since the last time we opened.

LVEA is Laser Hazard

09:49 Hugh – Recycling HAM5 HEPI
10:04 Aaron – Installing illuminater chassis at HAM2 and HAM5
10:18 Betsy & Travis – Working in west bay on 3IFO Quads
10:40 Dave – Cabling at the HAM6 bay
13:12 Karen – At Mid-Y
14:20 Besty & Travis – Working in LVEA west bay on 3IFO Quads
14:37 Peter – Going to Diode room to reset PSL watchdog

Jason, Rana, John

Credit for this one goes to John Worden.  He noticed the sawtooth pattern seen by the ITMy optical lever was very similar to that produced by the instrument air system re-pressurizing itself.  Sure enough, we go out and the copper instrument air line is touching the north end of the ITMy transmitter pier, so we moved it.  As can be seen on the attached graph, after the move the sawtooth pattern was gone.  I'll keep an eye on this over the next couple days to make sure this is actually fixed.

PSL Status: 
SysStat: Green 
Output power: 33.7w  
Frontend Watch: Red
HPO Watch: Red  

PMC:
Locked: 3 days, 14 hours, 33 minutes
Reflected power:    2.0w
Power Transmitted: 22.9w 
Total Power:       24.8w 

FSS:
Locked: 0 days, 1 hours, 40 minutes
Trans PD: 0.586v

ISS:
Diffracted power: 11.206%
Last saturation event: 3 days, 14 hours, 24 minutes  

Frequency of DAC lock out events (requiring IOP model restart to fix). Two more events since my last summary alog Link

9/11 2014 h1seih45

9/10 2014 h1seih23

8/11 2014 h1susb123

8/9 2014 h1seih23

4/21 2014 h1sush2a

3/18 2014 h1sush2a

2/27 2014 h1seih23

12/16 2013 h1seih23

11/7 2013 h1sush2a

11/7 2013 h2sush34

8/8 2013 h1seih23

Like HAM4, no problem taking HEPI down with Guardian, loading the new filters and bringing the loops back on with Guardian all while the ISI remains isolating.  Checked DTT and it looks better but I really need the full TF-hopefully tonight.

SEI – Working on TFs on HAM2 and HEPI commissioning

OpLev – Working on ITMY sawtooth laser glitch. 
	       Swapping BeamSplitter laser due to glitch

TCS – Laser alignment of TCS-X table

Test Mass Charging experiment is making measurements in the LVEA west bay cleanroom

The HAM2 TF data after the 1st couple of sections got corrupted so this needs to be run again.  Still, we can see that again the sharpe peaks between 10 & 40 hz, believed to be HEPI structures, are lowered in frequency and Q.  Also, the H3 CPS response does not develop into the deep zero around 6-7hz.  The lower UGF of 2hz on the HEPI position controller is believed to be the reason.  The attached plot compares the HEPI locked to closed HEPI Position loops ISI TFs.

Heard the chiller alarm this morning.  Found the water level to be a little below minimum.  Added about 400 milliliters.

model restarts logged for Sat 13/Sep/2014
2014_09_13 06:27 h1fw1
2014_09_13 09:52 h1fw1

unexpected restarts of h1fw1

Today I spent some time working on the DRMI guardian. It now is controling the state of the ITMX, IMTY, PRM and SRM suspensions.  It can transition smoothly between PRX, PRY, and MICH on the dark fringe with just one click. Hopefully this makes the repeated alingments of PRMI easier.  

Notes:

• Due to the buggy input matrix loading, you might need to check that the elements that got set are actually set (look for red).  The guardian is checking for this error in PRX PRY, but I didn't get to addding much error checking to the MICH or PRMI states yet. 
• None of these states can cope well with the situation where something gets kicked and is saturating, if that happens human intervention is needed, you should be able to simply request the down state, wait until everything is settled down, and then request the state you want again. 
• You will have to save alingments before changing the guardian requested state to a different configuration, otherwise your alingments will be lost.  The DRMI guardian should warn you with a user message i this is happening. 
• I made only the states which are tested requestable, so if it is on the pull down menu I think that it should be working.  The only questionable one is PRMI carrier, which was working OK last night but I didn't have time to actually see it lock today.  
• When one of these configurations losses lock, they do not go back to the down state (unless the IMC also lost lock), they just go to the LOCK state.  If you want to start from scratch and reset parameters, manually select down.  

model restarts logged for Fri 12/Sep/2014

2014_09_12 12:52 h1iopseih45
2014_09_12 12:54 h1hpiham4
2014_09_12 12:54 h1hpiham5
2014_09_12 12:54 h1isiham4
2014_09_12 12:54 h1isiham5
2014_09_12 16:22 h1broadcast0
2014_09_12 16:22 h1dc0
2014_09_12 16:22 h1fw0
2014_09_12 16:22 h1fw1
2014_09_12 16:22 h1nds0
2014_09_12 16:27 h1nds1

no unexpected restarts. h1seih45 restarted to clear stuck DACs. DAQ restarted to synchronize h1omc.

This morning at 2:30 am pacific time ITMY controls were turned off to check that the sawtooth seen on the OpLev yaw is not somehow cause by the ISI.  The sawtooth was there all night, and not seen in the stage 2 Rz sensors, screen shot attached.

This is as expected, since if this were real motion of the suspension we would not be able to lock. 

The ISI tripped this morning and tripped again when I was trying to bring it back, with the guardian complaining about smoe filter settings not as expected. 

Now it is fully isolated.