Here is the list of commissioning task for the next 7-14 days:

Green team:

• Look for the source of the 1/f noise.
• Look for clipping in green transmission.
• Make a mode scan of the red higher order modes.
• Test the length feedback path to the ETM top suspension point to suppress microseism.

Red team:

• Center the red QPDs in EX.

Blue team (ALS WFS):

• High bandwidth WFS.

Blue team (ISCTEY):

• Reflected beam quality investigation.
• Add WFS cabling.
• Add baffle diode electronics

SEI/SUS team:

• ETMY SEI commissioning.
• ETMY SUS commissioning.

Since Saturday the ODC for the PSL and (obviously) IMC have looked a little odd. They both keeping reporting very short, quick times when both the systems are not 'good'. These happen throughout the day as you can see by the two attached plots which show yesterday's activities (you can see more of these plots on the summary pages - https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/). Just wanted to check you knew about this and if so is this nothing to worry about? Thanks! 

Sheila, Chris, Alexa, Stefan

This morning we looked for coherences with many signals with our COMM noise.  There weren't any surprises, we see the same coherence with the end station PDH control signal around 1kHz that we are used to, ISCT1 accelerometers around 70-100Hz, and a little coherence (-0.7-0.9) with the oplevs at low frequencies (pitch at 0.5Hz, yaw around 0.1).  We don't see much coherence at all with the TMS QPDs, just a small bit at low frequencies.  We lose coherence with the in loop sensor below around 100Hz.  

Chris and I went out to End X to look into the beam quality problems.  We didn't find much that was promising.  We checked rather carefully for clipping on the way into the chamber again.  We also set up the nanoscan again, and we see that there really isn't anything coming back to the WFS when the ITM and the ETM are both misaligned (so it isn't a second beam that is directly reflecting a lens or some optic on transmon.)  

We also tried Daniel's suggestion of closing down an iris in the path.  For WFS B this only made things worse.  WFS A scans will be attached to this alog soon, but we didn't get any improvement there either.  

We came back and tried out some of Rich's blends.  We were able to get relatively low noise once without using WFS, 30z down to 0.02 Hz. The attached plot shows the COMM noise (measured by the IR) with different blends on.  We are curently seeing a lot of noise on ETMX T240s at around 3Hz, (100 times more) Rich is looking into this.

Optic is Newport 20B20NC.1 which has a 30min wedge. Since this is in a double path configuration it was not clear which orientation is the best, but I put it in such a way that the beam and the ghost beam going to the chamber separate immediately. OTOH this means that, for the return beam in HWS, PDH and WFS path, the main beam and the ghost crosses at a point 7" after the BS, and then separate. This is because it's easier to block the ghost beam(s) in HWS, PDH and WFS paths than at the back of the periscope.

After the installation of the BS, I used two irises downstream of the 2" PZT mirror to move the 2" PZT mirror position as well as the angle to recover the in-vac QPDs. I further adjusted the 2" PZT mirror and the corner steering mirror between the 1" lens and the 1" PZT mirror to center the beam horizontally on the 2" lens without losing the beam on QPDs.

The optic and the mirror holder were supplied by AOS, had to use lab stock for the post and the base plate.

This is Sheila, logged in as stefan
Switching blends to test some of Rich's new filter's etmx tripped.  Apparently according to rich this is a know problem, that the filters are incorrectly switched on a zero crossing instead of ramped.  

Guardian has recovered without a hitch.  

Hard closed GV11 (Bad, abnormal, "clank" from cam mechanism a few seconds before motor stopped) -> portable RGA assembly is valved into Y2 beam tube -> avoid this apparatus (at Y-mid on elevated slab near GV12) 

Took over for Justin/Pablo at about 2pm to cover the remainder of the shift.  The only new activities I can add are the following:

• 2:40--Installing jumper for T240 at EX (Aaron for Rich Mittlemen)
• After 4pm--Kyle will be closing GV11 for vacuum data on Y2 (see WP 4549)

PT410B seems to have responded, i.e. there looks to be some pressure "communication" via an inner O-ring (perhaps)

Scotty, Mitchell,
The Stage 2 midplate was torqued, inner hex walls added and torqued. The stage 1 Close out plate was added and torqued, the stage 1 close out plate cover was added. No hardware has been added, as there are 405 shcs's and the temp in the cleanroom was 85 which became a good stopping point.

Aaron put a dongle into the T240 ground monitor electronics to put it into high gain mode, I've  updated the caibration  filters so we should now be getting calibrated ground spectrum

***_STSINF_B_(X,Y,Z)_OUT

TCS work ongoing in the corner station, mostly along X-arm today

0845 - LVEA transitioned to laser SAFE

1000 - Jodi staging equipment to be removed from LVEA, accessing exterior airlock located in South Bay area. Then Jodi to MY.

1005 - Corey to EX TMS lab for part hunt

1030-115 Beamtube cleaning along X1 by JoeD, ChrisS, ChristinaC (doors left open)

1100 - Jeff/Richard inspecting dust monitor vacuum lines in LVEA

1150 - Dave restarting H1IOPSEIH45

1245 - Karen to EY---advised to tread lightly near BSC10 (Jim working on iso loops)

1250 - LVEA transitioned laser HAZARD

1313 - TCS energizing CO2 laser on TCSX

1315 - Travis on parts hunt LVEA test stand

1400 - OPS handoff to Pablo

Briefly measured the green return beam on ISCTEY. The first attachment shows the beam profile about 5" or so downstream of the BS that splits WFS and PDH. This is very good, though you might be able to tell that some broad thing is on top of mostly Gaussian main beam.

There are several ghost beams that potentially interfere with the main beam, the closest one being AR reflection from the 1" lens between two MadCityLabs PZT mirrors. The ghost beam is about 3uW in the WFS path while the main beam is 730uW, so this is not that bad, but I'll misalign the lens slightly so that the beam will not come on top of the main beam. The second attachment shows the beam profile of this ghost beam measured at the same position as the first one.

There was also a strong ghost beam coming from the BS to split WFS and PDH path. Total power coming to this BS is about 5.7mW, 5mW goes to PDH and 730 goes to main WFS beam while the ghost beam is about 17uW. This one is shifted in YAW and is easy to block. The third attachment shows this beam measured at the same position as previous two, but the scan head shifted in YAW by about 3mm.

Also there are many many internal reflections coming out of Faraday that  remain there even when the beam path to the chamber is blocked. The total power of these is 115uW. The brightest one is off in PIT but it was easy to block this by using an iris.

Calculated new output matrices for the IAL arm dither alignment:

Loops to be used:
OSC 1: ITM dither
OCS 3: PZT2 (angular dither at end station)
Loop better not used:
OSC 2: dither PZT1 (~position at the end station, but I don't know how accurately this is true.)

The output matrices are designed to only move the degree of freedom seen by the dither, i.e.
OSC 1:  only drives ITM
OSC 3: drives 1.065*ITM + 1*ETM (PIT) and -1.065*ITM + 1*ETM (YAW)
and for completeness
OSC 2: drives 2.065*ITM + 1.779*ETM (PIT) and 2.065*ITM - 1.779*ETM (YAW)

Calculation:
OSC 3:
- To rotate the beam axis around the end station, the ETM-to-ITM ratio has to be 1-to-gITM.
- The relative signs have to be the same as in the "soft" mode for the WFS output matrix.
OSC 2:
- To parallel-shift beam axis the ETM-to-ITM ratio has to be (1-gETM)-to-(1-gITM).
- Again, the relative signs have to be the same as in the "soft" mode for the WFS output matrix.

I noticed the frontend watchdog was still in FAIL state from last restart---I went into the H1Diode room and reset watchdog.

Laser Status: 
SysStat is good
Output power is 27.9 W (should be around 30 W)
FRONTEND WATCH is Active
HPO WATCH is red

PMC:
It has been locked 3 days
Reflected power is 1.4 Watts and PowerSum = 11.7 Watts.
(Reflected Power should be <= 10% of PowerSum)

FSS:
It has been locked for 12 min (should be days/weeks)
Threshold on transmitted photo-detector PD = 0.82 V (should be 0.9V)

ISS:
The diffracted power is around 2.54 % (should be 5-15%)
Last saturation event was 13 minutes ago (should be days/weeks)

I forgot to define USERAPPS in the sitemap laucher script from icon, this should now be fixed.  You may have to log out and log back in to get the fix (in the mean time start the sitemap from terminal).

I added a link from the VE/FMC pink button to the H0VE_FAN_SENSORS.adl screen.

Pump #1 was found to be 3000V and pump #2 5000V

Last Friday, Jim W. reported an offset on corner 2 of GS-13. Found BSC ISI Anti-Alias Interface Chassis (S1103401) had one of its outputs railing. AA Board S1101875 had U3 AD8622 on channel 6 replaced. 

will run for ~ 16 hours (undamped / damped for main and reaction chain)

Mark B.

Resuming work on BSFM02. Will take damped and undamped TFs and damped and undamped spectra.