Keita, Kiwamu, Sheila

This afternoon we aligned the beam for the ALS doubling path from the PSL through HAM1 and out to the viewport for ISCT1.  

When we began Kiwamu saw that the beam was entering the light pipe nearly at the bottom of the aperture on the PSL side, although it was too high inside the chamber.  The top mirror of the periscope is mounted so that it can only move vertically, so Kiwamu moved it up slightly.  After that the beam that we saw in the chamber was probably a reflection off of the sides of the light pipe, but Kiwamu was able to recover by steering to get a reasonable beam.  After walking the beam in this way, we arrived at an alignment where the top periscope mirror is at the highest position possible.  On the PSL side the beam enters the light pipe slightly low (~7mm) and to the west (~5mm) in the ~75 mm aperture.   At the viewport in HAM1 the beam arrives slightly to the east of the center of the viewport (less than 10% off center) and the height is adjusted so that the beam hits the steering mirror at its center.  we then adjusted the position of the steering mirror (moving it less than an inch to the east) so that the beam is centered on it in yaw, and centered on the viewport heading towards ISCT1.  

We also considered looking at the alignment of the IFO reflected beam using mode cleaner flashes, but Cheryl told us that that beam will be moved later anyway when IM1+2 are moved, so we held off.  The high power beam dump we did not install because it is not ready yet, a part is missing.  

IAS (DCook, JOberling) setup for pitch & yaw alignment on the BS optic. IAS directed SEI to perform a CCW yaw of 400urad. JWarner did a 1/3+ turn of all HEPI Springs to go CCW. IAS then reported ~45urad CCW remained. SUS TSadecki continued to do Pitch adjustments and the Yaw number may change slightly. This CCW Yaw calculates to move the BS ~0.1mm -Y. Based on the alignment results of 28 March the BS was already 0.8mm -Y and it looks like we pulled it East (-Y) close to 0.1mm based on the Dial Indicators.  So, Jim did a very careful +Y translation (west) of ~1mm with the HEPI Springs.  Jim did two rounds of 1/4turn west of all Springs.Based on the Dial Indicators, this is what we ended up doing.

From the last time we did an Optical Table elevation/level check we have shifted up 0.1mm with only 0.03mm tilt over the span of the Optical Table.

From the X Y Z alignment (28 March) we shifted west 38mils & north 4mils.  The rotation imparted by the translation since Yawing the table this morning is 0.0urads.  Yes 0.0; the DIs all read the same translations implying no rotation measured--Good work Jim!

- Apollo removed east door from WHAM01.
- Laser safe at 10:00 am, Michael R.
- 10:15 am, PNNL called, vibroseis "shaker" truck now active.
- PNNL called last night @ 7:15 pm to notify of end of work, no answer from LHO.
- Alignment work at BS chamber, Doug and Jason, watchdogs tripped several times.
- Patrick T to Y-Mid station.
- NSF tour in the LVEA at 11:26 am.
- Cheryl transition to laser hazard 11:52 am.
- Kiwamy made power measurements in the PSL, ref cav path.
- Kiwamu and Keita working in the WHAM01, stop for today, will continue at a later date.
- IO group working in HAM02
- Hugh and Jim working at WBSC02, HEPI work.
- Cyrus R. to Y-End, x-End and X-Mid, switch work/installation.
- Betsy W and Travis S. to check do ground checks of SUS in chamber, WHAM02 and WHAM03.

Sheila, Keita 

Keita and I had another look at the power losses in the fiber distribution box (S1202528) 
According to the test report the Y end output was 8.4% of the input.  

We remeasured the power into and out of the box, input today was 1.72 mW, Sample output 190 uW, X arm 128 uW, Y arm 112 uW, Squeezer 90 uW.  (the Y arm output is 6.5%, so 25% worse than in the test report) 

We also tried to look up the insertion loss for the beam splitters, it seems as though the beamsplitters we have are custom and not listed on the website, but the max insertion loss that they list on the website for a beam splitter is 1dB.  Daniel says that the AOM should have 2dB insertion loss, so the combination of the 2 beamsplitters and the AOM should be 4dB of losses.  

Based on those numbers we would expect the Y end output to be :
0.8*10^(-0.4)*0.33=10% of input from PSL

We also checked that the LO to the AOM is 10.4dBm, the nominal value is 10dB, so that is fine.  

It seems like we will want some more power from the PSL if possible. 

After getting the timing restored, I started the x1ioptriple and x1sushxts05 models.  I verified that dataviewer can display signals, and diaggui can do excitations and view signals.  Let me know if something isn't running correctly.

This morning I found the servo driving the pumps at maximum voltage and only achieving 26.3psi rather than the 28 psi setpoint.  I backed off the setpoint to the usual past 26psi and the drive dropped to ~2000/2048.  Probably a viscosity change from temperature increase.  Seems normal.

[Cheryl, Giacomo]

The IMC is flashing again.

We did restart alignment almost from scratch, through the following main steps:

- Beam centered on the top periscope mirror on the PSL table, usign the bottom periscope mirror and the mirror before that

- Beam centered on the HAM2 periscope, using the top periscope mirror. This did NOT recover the original input beam pointing, as the spot reflected off of the input viewport into the external PSL wall are slightly offset. However, it did look nice as input beam alignment.

- Beam centered on the irises in front on MC1 and MC2 using the actuated and non-actuated steering mirror, respectively.

- Beam centered on the iris in front of MC3 using MC2

- Round trip closed using MC3 and MC1... and IMC flashing!

The MCx offsets are as follows (in um on the alignment offset sliders):

It's good to see that the big (and a bit worrying) offsets in yaw of MC1 and MC3 are gone...

Attached are plots of dust counts requested from 5 PM April 7 to 5 PM April 8.

The plots for dust monitor 4 in the LVEA are interesting. Perhaps the change was from turning on the clean room over the test stand?

In prep for IAS alignment upcoming, I uncovered the BS suspension and resuspended it.  I also removed the corner cube mount in case SEI wants to do any balancing/checkouts/etc. before we get onto alignment (i.e. payload is correct).

The laser was restarted today without any trouble. I took the chance to realign the PMC as well and gained about 400 mW. A quick measurement of the visibility gave 97%.

Also, I was able to start the VB spectrum analyzer program on the Beckhoff computer and we finally have an all green status screen.

While investigating lost frames, Tx/Rx errors and a non zero CRC for the Corner MSR L8_9 Vertex (EK1521) (the terminal for the fiber connection to the H1 electronics room), the h1ecatc1 computer froze and restarted. I had looked into the chassis housing this terminal in the MSR and had not seen anything obviously wrong with it. However, the error LEDs on the Corner MSR L2 (EL3202-0010) (the temperature probe readout) terminal were both lit. After the computer restarted I restarted the system manager and deleted the configured terminal for the connection to end X (it was disabled because it is not connected), and checked that scanning the modules gave an identical configuration. It did, and I put it in run mode and started PLC1 and PLC2. The previous errors with the EK1521 are gone, but the error LEDs are still red on the EL3202. I have not restarted the EPICS IOCs.

800 - Michael Rodruck restarting PSL

900 - Betsy/Travis working in HAM2

930 - SnoValley working on chillers

1030 - Michael R engaged H1 PSL enclosure chiller to bring temperature down

1040 - HEPI pump station restarted by Hugh. Leak checking.

1250 - HFD burning tumbleweeds along RT 10 between LHO and Wye barricade

1337 - PNNL called to say vibroseis "shaker" truck now active at old Nike missile site. (HAWA--- old "Big G" experiment site)

1450 - Cheryl transitioning LVEA to laser hazard.

Before starting messing up with IO alignments, Cheryl asked my to check if any major drift was visible in he HAM2 and 3 suspensions after the outage.

For the IMs, I restored the offsets that were in effect before the outage, and compared the OSEMs readings. No significant drift was observed. Results are summarized in the following table (the columns on the right are just a visual representation of the difference in log scale).

-------------------------------------------------------------------------------------------------------------
OSEMs readings comparison between gps = 1048629616 (reference) and gps = 1049482936
-------------------------------------------------------------------------------------------------------------
Channel name                      Value at T1     Value at T2        Differ.   1       10       100      1000
-------------------------------------------------------------------------------------------------------------
H1:SUS-IM1_M1_OSEMINF_UL_OUT_DQ   +003.73+-5.18   +004.11+-1.16      +000.38   |        |         |         |
H1:SUS-IM1_M1_OSEMINF_LL_OUT_DQ   -082.58+-5.41   -080.89+-1.22      +001.70   |>       |         |         |
H1:SUS-IM1_M1_OSEMINF_UR_OUT_DQ   +017.31+-4.85   +018.25+-1.16      +000.94   |        |         |         |
H1:SUS-IM1_M1_OSEMINF_LR_OUT_DQ   -084.14+-5.18   -081.39+-1.28      +002.75   |>>>     |         |         |
-------------------------------------------------------------------------------------------------------------
H1:SUS-IM2_M1_OSEMINF_UL_OUT_DQ   -290.53+-2.85   -289.29+-1.90      +001.24   |        |         |         |
H1:SUS-IM2_M1_OSEMINF_LL_OUT_DQ   -242.12+-3.14   -236.62+-2.46      +005.50   |>>>>>>  |         |         |
H1:SUS-IM2_M1_OSEMINF_UR_OUT_DQ   +236.39+-3.13   +238.20+-3.44      +001.81   |>>      |         |         |
H1:SUS-IM2_M1_OSEMINF_LR_OUT_DQ   +132.75+-2.92   +138.67+-2.79      +005.92   |>>>>>>> |         |         |
-------------------------------------------------------------------------------------------------------------
H1:SUS-IM3_M1_OSEMINF_UL_OUT_DQ   +171.96+-3.88   +170.05+-0.93      -001.90   |>>      |         |         |
H1:SUS-IM3_M1_OSEMINF_LL_OUT_DQ   -090.16+-3.86   -086.71+-0.90      +003.45   |>>>>    |         |         |
H1:SUS-IM3_M1_OSEMINF_UR_OUT_DQ   +141.78+-3.64   +139.41+-0.89      -002.37   |>>>     |         |         |
H1:SUS-IM3_M1_OSEMINF_LR_OUT_DQ   -138.79+-4.38   -135.01+-1.05      +003.77   |>>>>>   |         |         |
-------------------------------------------------------------------------------------------------------------
H1:SUS-IM4_M1_OSEMINF_UL_OUT_DQ   -075.93+-4.06   -063.20+-7.54      +012.74   |>>>>>>>>|>        |         |
H1:SUS-IM4_M1_OSEMINF_LL_OUT_DQ   +283.91+-4.13   +295.35+-8.44      +011.44   |>>>>>>>>|>        |         |
H1:SUS-IM4_M1_OSEMINF_UR_OUT_DQ   -210.78+-3.92   -199.14+-5.11      +011.64   |>>>>>>>>|>        |         |
H1:SUS-IM4_M1_OSEMINF_LR_OUT_DQ   +123.32+-4.36   +134.96+-7.23      +011.64   |>>>>>>>>|>        |         |

I repeated the check for MC1, MC3 and PRM suspension. For technical reasons I had to keep the offsets off, so I compared the readings with a moment before the outage in which the watchdogs were tripped. Again, no major drift was observed.

-------------------------------------------------------------------------------------------------------------
OSEMs readings comparison between gps = 1048658416 (reference) and gps = 1049464816
-------------------------------------------------------------------------------------------------------------
Channel name                      Value at T1     Value at T2        Differ.   1       10       100      1000
-------------------------------------------------------------------------------------------------------------
H1:SUS-MC1_M1_OSEMINF_T1_OUT_DQ   -034.70+-0.03   -034.09+-0.03      +000.61   |        |         |         |
H1:SUS-MC1_M1_OSEMINF_T2_OUT_DQ   -036.14+-0.05   -036.29+-0.03      -000.15   |        |         |         |
H1:SUS-MC1_M1_OSEMINF_T3_OUT_DQ   -003.59+-0.04   -003.57+-0.03      +000.02   |        |         |         |
H1:SUS-MC1_M1_OSEMINF_SD_OUT_DQ   +006.22+-0.20   +006.87+-0.05      +000.65   |        |         |         |
H1:SUS-MC1_M1_OSEMINF_LF_OUT_DQ   +010.79+-0.23   +010.52+-0.05      -000.27   |        |         |         |
H1:SUS-MC1_M1_OSEMINF_RT_OUT_DQ   +028.01+-0.23   +028.59+-0.05      +000.58   |        |         |         |
H1:SUS-MC1_M2_OSEMINF_UL_OUT_DQ   +012.16+-0.39   +011.65+-0.07      -000.51   |        |         |         |
H1:SUS-MC1_M2_OSEMINF_LL_OUT_DQ   +257.26+-0.39   +256.64+-0.06      -000.62   |        |         |         |
H1:SUS-MC1_M2_OSEMINF_UR_OUT_DQ   -134.76+-0.34   -135.18+-0.06      -000.42   |        |         |         |
H1:SUS-MC1_M2_OSEMINF_LR_OUT_DQ   +141.28+-0.60   +141.81+-0.08      +000.53   |        |         |         |
H1:SUS-MC1_M3_OSEMINF_UL_OUT_DQ   -046.67+-0.62   -047.22+-0.09      -000.55   |        |         |         |
H1:SUS-MC1_M3_OSEMINF_LL_OUT_DQ   +260.52+-0.57   +259.95+-0.07      -000.57   |        |         |         |
H1:SUS-MC1_M3_OSEMINF_UR_OUT_DQ   -067.45+-0.57   -067.82+-0.08      -000.37   |        |         |         |
H1:SUS-MC1_M3_OSEMINF_LR_OUT_DQ   +198.45+-0.65   +198.63+-0.08      +000.19   |        |         |         |
-------------------------------------------------------------------------------------------------------------
H1:SUS-MC3_M1_OSEMINF_T1_OUT_DQ   -008.19+-0.04   -008.33+-0.04      -000.14   |        |         |         |
H1:SUS-MC3_M1_OSEMINF_T2_OUT_DQ   -015.25+-0.07   -015.22+-0.03      +000.03   |        |         |         |
H1:SUS-MC3_M1_OSEMINF_T3_OUT_DQ   -020.96+-0.06   -021.16+-0.03      -000.19   |        |         |         |
H1:SUS-MC3_M1_OSEMINF_SD_OUT_DQ   -006.14+-0.07   -005.79+-0.05      +000.35   |        |         |         |
H1:SUS-MC3_M1_OSEMINF_LF_OUT_DQ   +008.46+-0.31   +008.51+-0.06      +000.05   |        |         |         |
H1:SUS-MC3_M1_OSEMINF_RT_OUT_DQ   -057.79+-0.33   -056.71+-0.06      +001.08   |        |         |         |
H1:SUS-MC3_M2_OSEMINF_UL_OUT_DQ   +143.88+-0.58   +144.30+-0.09      +000.42   |        |         |         |
H1:SUS-MC3_M2_OSEMINF_LL_OUT_DQ   +073.77+-0.91   +074.45+-0.11      +000.68   |        |         |         |
H1:SUS-MC3_M2_OSEMINF_UR_OUT_DQ   +079.45+-0.53   +080.13+-0.07      +000.68   |        |         |         |
H1:SUS-MC3_M2_OSEMINF_LR_OUT_DQ   +044.42+-0.73   +045.32+-0.08      +000.90   |        |         |         |
H1:SUS-MC3_M3_OSEMINF_UL_OUT_DQ   +092.77+-0.97   +093.25+-0.12      +000.48   |        |         |         |
H1:SUS-MC3_M3_OSEMINF_LL_OUT_DQ   +115.28+-1.26   +116.35+-0.16      +001.07   |        |         |         |
H1:SUS-MC3_M3_OSEMINF_UR_OUT_DQ   +082.64+-0.83   +083.89+-0.09      +001.25   |        |         |         |
H1:SUS-MC3_M3_OSEMINF_LR_OUT_DQ   +024.52+-1.46   +026.39+-0.16      +001.87   |>>      |         |         |
-------------------------------------------------------------------------------------------------------------
H1:SUS-PRM_M1_OSEMINF_T1_OUT_DQ   -010.93+-0.05   -011.00+-0.04      -000.07   |        |         |         |
H1:SUS-PRM_M1_OSEMINF_T2_OUT_DQ   +018.33+-0.06   +017.93+-0.04      -000.40   |        |         |         |
H1:SUS-PRM_M1_OSEMINF_T3_OUT_DQ   -011.63+-0.07   -011.87+-0.04      -000.24   |        |         |         |
H1:SUS-PRM_M1_OSEMINF_SD_OUT_DQ   -050.86+-0.21   -050.43+-0.06      +000.42   |        |         |         |
H1:SUS-PRM_M1_OSEMINF_LF_OUT_DQ   +001.20+-0.29   +001.34+-0.03      +000.14   |        |         |         |
H1:SUS-PRM_M1_OSEMINF_RT_OUT_DQ   -013.73+-0.29   -013.04+-0.03      +000.69   |        |         |         |
H1:SUS-PRM_M2_OSEMINF_UL_OUT_DQ   +064.17+-0.60   +064.34+-0.06      +000.17   |        |         |         |
H1:SUS-PRM_M2_OSEMINF_LL_OUT_DQ   +057.88+-0.88   +058.35+-0.07      +000.47   |        |         |         |
H1:SUS-PRM_M2_OSEMINF_UR_OUT_DQ   +021.27+-0.56   +021.52+-0.06      +000.25   |        |         |         |
H1:SUS-PRM_M2_OSEMINF_LR_OUT_DQ   +027.12+-0.81   +028.15+-0.06      +001.04   |        |         |         |
H1:SUS-PRM_M3_OSEMINF_UL_OUT_DQ   +023.28+-0.94   +024.00+-0.08      +000.72   |        |         |         |
H1:SUS-PRM_M3_OSEMINF_LL_OUT_DQ   -002.46+-1.23   -000.09+-0.09      +002.37   |>>>     |         |         |
H1:SUS-PRM_M3_OSEMINF_UR_OUT_DQ   +027.42+-0.91   +027.77+-0.07      +000.35   |        |         |         |
H1:SUS-PRM_M3_OSEMINF_LR_OUT_DQ   +066.64+-1.28   +068.56+-0.09      +001.92   |>>      |         |         |

Finally, MC2 had to be compared with offsets off, but from a different period. Again, no major drifts or shifts in alignment.

-------------------------------------------------------------------------------------------------------------
OSEMs readings comparison between gps = 1048939216 (reference) and gps = 1049464816
-------------------------------------------------------------------------------------------------------------
Channel name                      Value at T1     Value at T2        Differ.   1       10       100      1000
-------------------------------------------------------------------------------------------------------------
H1:SUS-MC2_M1_OSEMINF_T1_OUT_DQ   -032.01+-0.04   -028.31+-0.06      +003.70   |>>>>>   |         |         |
H1:SUS-MC2_M1_OSEMINF_T2_OUT_DQ   -076.77+-0.04   -074.11+-0.06      +002.66   |>>>     |         |         |
H1:SUS-MC2_M1_OSEMINF_T3_OUT_DQ   +007.41+-0.04   +010.39+-0.06      +002.98   |>>>>    |         |         |
H1:SUS-MC2_M1_OSEMINF_SD_OUT_DQ   -001.64+-0.06   -001.30+-0.12      +000.34   |        |         |         |
H1:SUS-MC2_M1_OSEMINF_LF_OUT_DQ   +025.48+-0.11   +024.70+-0.20      -000.78   |        |         |         |
H1:SUS-MC2_M1_OSEMINF_RT_OUT_DQ   +021.43+-0.08   +020.58+-0.14      -000.85   |        |         |         |
H1:SUS-MC2_M2_OSEMINF_UL_OUT_DQ   +027.67+-0.16   +026.48+-0.32      -001.20   |        |         |         |
H1:SUS-MC2_M2_OSEMINF_LL_OUT_DQ   +022.56+-0.22   +020.81+-0.45      -001.75   |>       |         |         |
H1:SUS-MC2_M2_OSEMINF_UR_OUT_DQ   +033.66+-0.17   +032.37+-0.32      -001.29   |        |         |         |
H1:SUS-MC2_M2_OSEMINF_LR_OUT_DQ   +052.13+-0.20   +050.76+-0.42      -001.37   |        |         |         |
H1:SUS-MC2_M3_OSEMINF_UL_OUT_DQ   +029.85+-0.25   +028.22+-0.54      -001.63   |>       |         |         |
H1:SUS-MC2_M3_OSEMINF_LL_OUT_DQ   -010.71+-0.29   -012.82+-0.61      -002.12   |>>      |         |         |
H1:SUS-MC2_M3_OSEMINF_UR_OUT_DQ   -020.21+-0.24   -021.43+-0.51      -001.22   |        |         |         |
H1:SUS-MC2_M3_OSEMINF_LR_OUT_DQ   +038.40+-0.34   +035.94+-0.73      -002.46   |>>>     |         |         |

The RF source signals became dirty. This is currently under investigation.

In the past Friday I was checking the electronics at the field racks as a part of the power recovery activity. And I found that the RF source signals from the RF distribution amplifiers had become dirty -- there are lots of harmonics lines and cross-talks (see below). If I remember correctly those were not seen when we tested the RF stuff in the last Month [1][2] and therefore something must have happened since then. The raw data files are attached as well.

Figures: output from the 24 MHz RF amp (figure 1), 9 MHz RF amp (figure 2) and 45 MHz RF amp (figure 3).
 

[1] LHO alog 5854 "Installation and Checkout of RF signal chains on ISCT1 and HAM1"
[2] LHO alog 5849 "The 9MHz amplifier box is back"

After fixing any loose dog clamps, and retorquing, Arnaud and I took B&K hammer measurements of the HAM2 PR3, PRM, and MC1 this morning.  We still need to do PR2 and MC3 (which has a temp IO alignment mirror nestled up against it's structure).  We took PR3 and PRM data with vibration absorbers on and off.  We only took MC1 data with the vibration absorbers on since they were already on and are difficult to remove and then replace.  Plots and statements to come.