Low level alarms for mid X instrument air pressure, Kyle R. notified

09:32 Sheila D., Pablo H. and Kiwamu I. entering HAM1 to measure the beam profile of the reflected light from the PRM through the Faraday isolator
09:40 Cheryl V. going to the end X TMS lab
09:57 Safety review tour
10:29 Ace portable toilets onsite for maintenance
10:50 Betsy W. found the dust monitor at end X inside the electronics rack. She set the audible alarm limits and moved it into the clean room over ETMX
10:53 Sheila D., Pablo H. and Kiwamu I. done with the measurement in HAM1
11:26 Safety review tour has left the LVEA
12:37 Betsy W. getting parts from the rack by HAM2
12:43 Large dust spike reported by dust monitor at end X, nobody appeared to be in the VEA (see below)
13:01 Cheryl V. heading back from end X
13:29 Filiberto C. and Aaron S. working on cabling in middle high bay at end Y
13:49 Timing errors for end Y ISC, Aaron S. had powered down the IO chassis
15:47 Dave B. attempting to bring back the SEI, SUS and ISC frontends at end Y
15:53 Thomas V. done working on baffles
15:59 Justin B. transitioned the LVEA to laser safe (WP 4161)

Kyle R. replaced the instrument air transducer at end X (WP 4160)

Large spike in only > .3 micron particle counts measured in the clean room at end Y from 12:41 - 13:13. (see attached plot)
Dust monitor is labeled 'S'. Calibration date: 8/9/13 Calibration due date: 8/9/14. Cause as of yet undetermined.

Following DC power work at EY which powered down h1iscey's IO Chassis, I restarted all the dolphined front ends at EY. There was an mx_stream glitch in the process, which may have corrupted other front end's data for a minute or so.

Rich A., Stefan

In response to yesterday's IMC phase jump (alog 7941) we measured the cable impedance reflection coefficient for the 24.078360MHz cable heading from the PSL rack to the EOM inside the PSL.

Attached is a picture of the measurement. Note
1) The FieldFox internal clock is not very good, but the reference marker corresponds to the actual IMC modulation frequency of 24.078360MHz.
2) The EOM resonance is about one hundred kHz low - we don't get much resonant gain at all.
3) Wiggling that cable didn't produce any visible impedance change.

We placed Mode Master downstream of three-mirror Gouy phase matching telescope comprising two tip-tilts and one fixed mirror that is used for REFL WFS. (See the last picture for layout and distances.)

Note that the measured TT1-TT2 distance is about 1cm shorter than nominal described in Sam Waldman's document (http://dcc.ligo.org/T1000247), TT2-M5 distance is about 14mm longer than nominal, both of which should have been quite acceptable.

Anyway, we made this measurement and the beam was much smaller than what was expected. The first plot as well as the table below show the measured VS  the expected mode profile coming out of HAM1 propagated through the telescope with the measured mirror distances.

The total mode overlap between the actual beam and what is expected is somewhere between 0.75 and 0.87 (sort of tedious to do the real calculation so I leave it).

The 2nd plot shows that IF the incoming beam from HAM1 is as expected, in order to explain the measured mode the TT1-TT2 distance labeled as delta1 should be shorter by 4.5cm than was measured for X, or by 5.7cm for Y. This is a huge number, there's no way my distance measurement was that much off.

The 3rd plot  shows the Gouy shift between TTs (i.e. actuation orthogonality) and WFSs for the WFS sled (i.e. sensing), and it seems like both are quite poor for the measured mode, 26deg for actuation and 35 for sensing are sad though not a complete disaster.

Anyway, since it's hard to imagine that the ROC of TT1 (+1.7m), TT2 (-0.6m) and M5 (+1.7m) are grossly wrong, and since it's hard to imagine that the distance measurement has a 5 to 6cm error, this should mean either (or some) of the followings:

1. T1000247 is wrong about the mode coming out of HAM1.
2. IMC mode is not mode matched to the IFO well.
3. Astigmatism of curved optics at an angle (there are 3 such optics on HAM1, more on HAM2), each has small effect but maybe they add up. Neither Sam nor I have included this.

The third one doesn't sound likely, but neither Sam nor I have thought about this.

(Kiwamu, Stefan)

IMC demodulation phase rotated again for the 4th time...

After the IMC sideband sweep measurement this morning we noticed that the IMC WFS were no longer stable, and the IMC locking was a bit shaky. Sure enough we found that  the RF phase rotated again, with most of the signal back in the I-phase (we use the Q-phase for feed-back.)

The 1st attached picture shows the I signal along the x-axis, and the Q signal along the y-axis. Also note that the size of the signal is not much smaller than in the picture from alog 7181 (and we currently has a slightly reduced PSL input power due to the installed 10% and 30% BS for the FI isolation measurement).

For now we again adjusted the phase of both length and angle sensors.

The new delay setting is in the 2rd attached picture (the old one is in alog 7119 - note that in alog 7119 we used the I-phase for feed-back). Picture 3 shows the I signal along the x-axis, and the Q signal along the y-axis after the LO delay change of 9.75nsec (~85deg).

The new WFS phase settings are the same as back in alog 7119 :

H1:IMC-WFS_A_SEG1_PHASE_R = -185
H1:IMC-WFS_A_SEG2_PHASE_R = -112
H1:IMC-WFS_A_SEG3_PHASE_R = -185
H1:IMC-WFS_A_SEG4_PHASE_R = -185
H1:IMC-WFS_B_SEG1_PHASE_R = -80
H1:IMC-WFS_B_SEG2_PHASE_R = -132
H1:IMC-WFS_B_SEG3_PHASE_R = -66.5
H1:IMC-WFS_B_SEG4_PHASE_R = -173

Before I changed them, the phases were

H1:IMC-WFS_A_SEG1_PHASE_R = -90
H1:IMC-WFS_A_SEG2_PHASE_R = -17
H1:IMC-WFS_A_SEG3_PHASE_R = -27
H1:IMC-WFS_A_SEG4_PHASE_R = -22
H1:IMC-WFS_B_SEG1_PHASE_R = +15
H1:IMC-WFS_B_SEG2_PHASE_R = -34
H1:IMC-WFS_B_SEG3_PHASE_R = +28.5
H1:IMC-WFS_B_SEG4_PHASE_R = -81

In conclusion - we are back in the same "RF phase state" as in elog 7119.
 

I've aligned the REFL beam from RM2 through the ISC sled. The beam from the pick-off BS is temporarily dumped in a spare black glass V-dump. The beam in the sled is well aligned through the first two lenses and the first 2 turning mirrors but is about 8mm high on the last turning mirror. It seems that the turning mirrors on the sled need to be adjusted to fix this but I wanted to consult with Keita about this first as it was my understanding that these had already been aligned in the lab.

We could not retreive data for the transfer functions that ran overnight on ITMX. 

Run_Get_Batch.m, the generic script that the seismic team uses to get data from the frames, would systematically crash when collecting data for Stage1-V1 excitation, in the 500Hz-1000Hz frequency range (see attachement #1). It would also crash when trying to collect data for the other frequency bins.

We looked at the data stored in the frames (DaveB, and ArnaudP helped), and compared it with what was in the slow channels.
- The actuation signals were sent to the correct channels and witnessed by the related slow channels (see attahchement #2)
- However, the daq channel for the excitation along Stage1-V1 does not recall any excitation (see attachement #3), while one was recorded by its slow channel twin (see preious comment).

New channels were added to the master model, and h1isitst.mdl was not restarted since. When JimW and I restarted the TST model yesterday night, those channels were added to the .ini file. JimW and I did not dare restarting the DAQ without CDS people around. This is likely to be the reason why the data in the frame was corrupted.

A couple DAQ restarts were performed as part of the maintenance day today. Last one was around 3pm. We then started to run a quick set of high frequency transfer functions, and made sure that the data collection process went well. It did.

Transfer functions will be running ovenight on ITMX (currently on the test stand, using TST model)

** Work permits signed by ops today: 4157 (EY one-stop cables), 4158 (FW1 reconfigure SSD disks), 4159 (online detchar channel)
** LN2 delivery to CP3 (MY)
** Roofers moved a lot of material and equipment onto the Corner Station roof; also worked on the roof at MY
** Two DAQ re-starts, morning and afternoon
** A number of H1lsc CDS overflow alarms; I checked with Dave and disabled this alarm
** Lots of work at/near HAM1 today
** Usual Tuesday morning vendors on site
** EX spool clean room was cleaned this morning
** Cheryl worked in the EX TMS lab
** Dust monitor 9 continues to alarm in the white condition
** Lots of dust alarms at EX today as personnel were working in the VEA.  12-hour trend attached.
** LVEA has been in laser hazard all day and remains in laser hazard at 17:20 local.

HughR, GregG, JimW

 Today, we managed to get most of SEI's cables sorted and connected. Cable brackets were installed, unfortunately I forgot that the GS-13's need to be shorted to the ISI, until Hugh reminded me. Still need to fix corners 2 and 3. Otherwise, it went well, seismometer cables (unplugged at the pods) and CPS's are plugged into the chamber. I watched MEDM as Greg connected CPS's, and we ran an emulator on the seismometer cables, so we are pretty sure the right sensors are plugged into the right spots. Now, we are ready for TMS and SUS to go in, uncover,  add the last of their hardware and plug in before SEI can float and balance.

Doug and Jason
We are setup and ready to start the in situ position alignment of the ETMx and relay the results to Hugh for ISI tweaks. We will need 30min in the morning to make sure none of out equipment has moved over night.

Scott and Randy (Apollo) rechecked and verified the elevation monuments based on BSC9 chamber centering.

(Kiwamu, Paul, Stefan)
This morning we found the back-reflection from the PRM, leaking through the Faraday, back on the PSL table.
We measured the following powers:
- direct beam, sampled by ~30% BS: 339mWatt
- return beam, sampled by the same ~30% BS: 37.0uWatt
- as reference, we also measured the power on the REFL beam on ISCT1, just after the periscope: 6.94mWatt

Faraday isolation ratio: 37.0uW/339mW, minus other losses (IMC visibility, PRM reflectivity)