Nothing new below the control room roof:
- Kiwamu and company still working in HAM1
- Jim W. and company installed the cartridge at EX (see Jim W aLOG 7881)
- Hugo waiting for works on HAM1 to start HAM2/3 TF
- Isolation measurement on hold while HAM1 work continues
Have a nice evening!
pablo
Apollo (Bubba, Randy, Scott, Tyler), GregG, MitchR, JeffB, AndresR, JimW
After an earlyish start at 8am and an abbreviated lunch, the cartridge install wrapped up at 2pm. No major hitches beyond a somewhat "poofier" C3 wrap job than previous installs. This necessitated the removal of a cleanroom filter unit to allow the cartridge to clear. (Note: SUS covers need to their bottoms clipped to the side (for maximum clearance), not bunched at the bottom, as is the usual practice). Otherwise very smooth. SUS and TMS should head in chamber next to inspect their systems.
Corner: --------
- HAM1 work
--- continues today with alignment - needs IMC locked
- IO
--- isolation measurement on hold while HAM1 work continues
- HAM2/3
--- HEPI transfer functions tonight
- Optics lab to laser hazard, now back to laser safe
--- Kiwamu and Pablo measuring reflectivity
MY: -------------
- Corey going to get a bin
EX: --------------
- flying the cartridge today, as of 1PM cartridge is partly lowered into the clean room
Alarms: -------------
- some spikes at EX, but due to move, and cartridge is wrapped in C3
- CP1 filled, level is coming down, currently at 101.2%
[Pablo and Kiwamu]
We have measured the reflectivity of another 2" P-polarizing beam splitter (E040512-B3 SN: I0822-07) for S-polarization this morning at the OSB optics lab.
The results are :
HR reflectivity R = 92.5 % for S-pol @ 1064 nm, 45 deg
AR reflectivity R = 2.8 % for S-pol @ 1064 nm, 45 deg
Background :
Even though we already installed a 90% S-polarizing beam splitter on HAM1, we still thinks that this 90% might not be big enough to attenuate the reflection beam to avoid damaging the detectors. One way to increase the safety margin is to simple replace this 90% BS by one with a higher reflectivity. Because we have 90% P-pol BS in hand we simply wanted to try measuring the reflectivity with a S-polarizing beam.
Setup:
Same as the previous measurement (see alog #7817).
Alexa and I mounted the PD interface box on the new end Y table this morning. We used brackets from Mcmaster, and 2 inch long 10-32 bolts from the mechanical room. The bolts are long enough that the box hangs just below the lights. This is a little different from what they've done at LLO LLO alog 8847 , but it works with the brackets we have. We turned the box around with respect to the way it is on the ISCEX table, so that it will be easier to reach the connectors when the HWS interface box is installed. This is the position we had in mind when we measured the cable lengths. The last image attached is the ISCEX table, with the HWS interface box already installed just for reference.
Pictures of today's HAM1 activity are posted in ResourceSpace:
Attached are plots of dust counts requested from 4 PM September 24 to 4 PM September 25.
I designed an initial a set of position loops for HEPI-HAM3.
Those are not polished at all, and cause un-necessary gain peaking. They however show that our matrices (which I reinstalled today) are good.
Performance spectra are attached.
(Update: The title of this entry turns out to be wrong. See addendum.)
After putting optics in the tip-tilts and very roughly balancing, the BOSEM flags looked very high, probably between 1.5mm and 2mm even though the blades were brought all the way down. See the first and second picture, note that the table is not level in these pictures, but it's obvioius that the mirror is too high.
Bram pointed out over the phone that the wire clamps should be under the blades, not the other way round. And sure enough, our clamps were sitting on top of the blades on both of two pre-assembled tip-tilts. In the third picture you can see that the clamp is on the wrong side and that the left blade adjustment is already bottoming out (tension screw is too long).
If the clamps move to the correct side of the blades the mirror height will be OK (though the blades should be set as low as possible).
It seems as if the wire length is about right (Alexa measured the height difference of the blade clamp and the mirror clamp, and it was about 140mm).
Problem is, there might be no way to move the clamps from one side to the other without compromising the wire direction. I'm asking Bram the best way to proceed.
Addendum: Now Bram says that the clamps are OK, they're supposed to be on top of the blades!
He looked up some document and it turned out that the clamps are supposed to be on top.
He suggested to bring the blade down further by using washers for the blade angle adjustment screws.
I did face this misalignment in some of the tiptilts that I assembled and in all cases could solve the problem by swapping out the blade height adjustment screws for shorter ones (allowing us to lower the blade tips further). I have attached the original design document here and some annotated pics to help you with the adjustments. Essentially there are three things which could make the flags go too high: 1) the suspension points are high 2) the backplane on which all the BOSEMS are mounted has slid down within the play in the mounting screws 3) the optic is pitched too far face-down, raising the tips of the flags inside the BOSEMS. You might be facing an unfortunate co-incidence of all three at the same time.
- Thomas and Apollo crew, stagging of ETMX ACB components into BSC09.
- High dust counts @ X-End, called staff and notified them, >0.3u @ 4000.
- Kiwamu and Pablo, work in OSB optics lab while on laser hazard.
- Jeff, X-End station, ETMX preparation for installation.
- PEM crew, pulling cables in the CS-VEA and Y-End VEA.
- Dave and Hugo, DAQ reboot.
- Kyle, open GV2, part of WP#4148.
- Fire drill for LSB and OSB, 2:00 pm local time.
Jodi F and Jeff B Rechecked and adjusted the stops on ETM-X in preparation for moving the cartridge into the BSC. Engaged the blade stops on the UI mass and three of the Top Stage blades (could not get to the fourth Top Stage blade stop) and tightened all EQ lock nuts that were accessible. Installed the metal face covers over the optics and secured their locking nuts. Removed the wafer holder from the bottom of the Quad. With Jodi's help, covered both the Quad and the TMS suspensions with C3 Quad bags.
(Alexa, Daniel)
ISC electronics work in the corner:
We are waiting for the 79.2MHz RF source in rack C4, the two additional frequency-difference dividers in R1, the summing node and SUS satellite amplifier in R4, as well as the corresponding cabling.
[Pablo and Kiwamu]
We adjusted the rotation angle of HWP1 which is an in-vac half wave plate in HAM1 to convert the polarization of the REFL beam from S to P.
We took HWP1 out of the HAM1 chamber and brought it to the optics lab because it is much easier to do it in a lab rather than in a chamber. Then we setup a 1064 nm fiber laser and some optics in the optics lab to adjust it. The first picture below shows the setup where we used two PBSs. We minimized the amount of S-polarizing beam by looking at the power of the rejected beam from the second PBS. At the PBS we got a rejected (S-pol) beam of 0.5 uW out of 10 mW incident (S-pol) beam on HWP1. The last picture shows the rotational angle of HWP1 after the adjustment. We locked the rotational part so that it won't rotate any more.
Dave, Hugo,
New channels were added to the science frame yesterday (LHO aLog #7849). Those channels are defined in a simmulink block called GND_STS. The GND_STS block was copied from gnd_sts_library.mdl and pasted in the BSC-ISI top level models of ITMY, ETMY, and ETMX, as intended. The gnd_sts_library.mdl contained one GND_STS block for ITMY, one for ETMX, and one for ETMY. Those three blocks carried the same name, with different content. Yesterday's work indicated that the RCG got confused by the multiplicity of names, and picked the wrong GND_STS block from the library, to generate the .ini file, which lists the channels to be recorded in the science frame.
Yesterday's solution was to rename each of these GND_STS block, within gnd-sts_library.mdl, so they would have distinct names. Doing so, impacted the names of the channes saved in the science frame:
GND_STS blocks were renamed as follow:
- GND_STS_IY, for the one to be pasted in h1isiitmy.mdl
- GND_STS_EX, for the one to be pasted in h1isietmx.mdl
- GND_STS_EY, for the one to be pasted in h1isietmy.mdl
GND_STS channels in the Science Frame were then (in red, the diffence whith what was intended by T1300742):
We found a workaround this morning, so the ground STS channels would be named correctly in the science frame:
- We split gnd_sts_library.mdl into 3 distinct libraries:
- gnd_sts_library_IY.mdl (which contains the GND_STS block for ITMY)
- gnd_sts_library_EX.mdl (which contains the GND_STS block for ETMX)
- gnd_sts_library_EY.mdl (which contains the GND_STS block for ETMY)
- The GND_STS blocks were copied, and connected, into the relevant models ( h1isiitmy.mdl, h1isietmx.mdl, h1isietmy.mdl)
- We checked that the GND_STS blocks we pasted were linked to the correct simmulink libraties (gnd_sts_library_IY.mdl, gnd_sts_library_EX. mdl,gnd_sts_library_EY.mdl)
- BSC-ISI models were recompiled for ITMY, ETMX and ETMY.
- GND channel names were checked in the science frame. They are now correct (see below)
The new BSC top-level models were commited to the SVN:
-rev 5737
- h1isiitmx.mdl
- h1isiitmy.mdl
- h1isietmx.mdl
- h1isietmy.mdl
-rev 5738
- h1isibs.mdl
Comments were added to the new gnd_sts_library_XX models to describe how to use the GND_STS blocks.
Models were commited under the SVN in /opt/rtcds/userapps/release/isi/common/models:
- gnd_sts_library_IY.mdl -r 5744
- gnd_sts_library_EX.mdl -r 5742
- gnd_sts_library_EY.mdl -r 5743
After a third ADC card was added to the h1lsc0 I/O chassis (alog 7842), I edited the h1lsc model as follows:
The new model has been compiled, started, and checked into SVN. Its MEDM overview, safe.snap and filter files will be updated and checked in tomorrow.
MEDM screens, filter file, and safe.snap have been updated and checked in. The filters from ALS_C_COMM_A_RF_I were moved to ALS_C_COMM_A_RF_ERR. More details about the rewiring:
The reflective memory links between h1lsc and h1iscex were not working, because the card number parameter of the cdsIPCx_RFM parts was wrong. I had just copy-pasted the parts from EY to EX and forgot to change this parameter. For the record, the correct card number settings are: "0" for EX and "1" for EY. After the h1lsc and h1iscex models were updated to get this right, the RFM links came up. The updated models have been checked in to SVN.
(Alexa, Daniel)
We checked the vacuum feedthrough flanges on HAM 1 and noticed that none of the double 5-way coax flanges were installed. The missing positions are D1-3, D4-2, D5-2, D6-2 and D6-3 (see D1002872). We are also missing a double D-sub feedthrough flange on position D1-3. With some help we were able to locate the missing flanges and they are awaiting installation.
We noticed that purge air port is located on D5-3 rather than D4-3 as the drawing would indicate. The easiest way to accommodate this difference is to simply route the TT signals through D4-3. It is already equipped with a double D-sub feedthrough flange.
We were able to find some of the in-air cables. The beam diverter cables were routed to the wrong side of the chamber. They were too short to reach the designated flange, so we had to reroute them. We are missing the cables for the LSC PD DC signals and still have to install the coax cables. We have cables for the picomotors, but will do a test first.
There is no SUS satellite amp in the ISC-R4 rack. All units are at LLO and are being shipped.
The picomotor cable has been tested and hooked up. We also installed the one that goes to ISCT1.
The beam diverter cables were tested and installed on D1-1 and not at D2-1 as shown in the drawing. D2-1 is inaccessible.
Arnaud P. Betsy W. Did B&K hammer measurements on Friday feb 8th on the BeamSplitter that will be installed in BSC2. Config: BSC-ISI Unlocked, QUAD Unlocked, Baffles ON, Vibration Absorbers ON, Damping ON. Attached, pictures describing the position of hammer impacts, and accelerometer + corresponding pulse files.
Raw data has been exported from the B&K Pulse files, in accordance with the procedure outlined in the SUS Operations Manual (see How to do B&K Hammer Testing). Exported ASCII data files have been committed to the SUS svn at the following location, ligo/svncommon/SusSVN/sus/trunk/BSFM/H1/BS/BandK$, these files include the following (n.b. files have been renamed to comply with convention detailed in the Op's Manual) :- SimpleHammerDisplay3-BS-Bottom-SUSunlocked-ISIunlocked-VAfitted-Yimpact.pls SimpleHammerDisplay3-BS-Bottom-SUSunlocked-ISIunlocked-VAfitted-Yimpact.txt SimpleHammerDisplay3-BS-BottomLeft-SUSunlocked-ISIunlocked-VAfitted-Ximpact.pls SimpleHammerDisplay3-BS-BottomLeft-SUSunlocked-ISIunlocked-VAfitted-Ximpact.txt SimpleHammerDisplay3-BS-BottomRight-SUSunlocked-ISIunlocked-VAfitted-Ximpact.pls SimpleHammerDisplay3-BS-BottomRight-SUSunlocked-ISIunlocked-VAfitted-Ximpact.txt SimpleHammerDisplay3-BS-TopLeft-SUSunlocked-ISIunlocked-VAfitted-Ximpact.pls SimpleHammerDisplay3-BS-TopLeft-SUSunlocked-ISIunlocked-VAfitted-Ximpact.txt SimpleHammerDisplay3-BS-TopLeft-SUSunlocked-ISIunlocked-VAfitted-Yimpact.pls SimpleHammerDisplay3-BS-TopLeft-SUSunlocked-ISIunlocked-VAfitted-Yimpact.txt SimpleHammerDisplay3-BS-TopMiddle-SUSunlocked-ISIunlocked-VAfitted-Ximpact.pls SimpleHammerDisplay3-BS-TopMiddle-SUSunlocked-ISIunlocked-VAfitted-Ximpact.txt SimpleHammerDisplay3-BS-TopMiddle-SUSunlocked-ISIunlocked-VAfitted-Yimpact.pls SimpleHammerDisplay3-BS-TopMiddle-SUSunlocked-ISIunlocked-VAfitted-Yimpact.txt SimpleHammerDisplay3-BS-TopRight-SUSunlocked-ISIunlocked-VAfitted-Ximpact.pls SimpleHammerDisplay3-BS-TopRight-SUSunlocked-ISIunlocked-VAfitted-Ximpact.txt SimpleHammerDisplay3-BS-TopRight-SUSunlocked-ISIunlocked-VAfitted-Yimpact.pls SimpleHammerDisplay3-BS-TopRight-SUSunlocked-ISIunlocked-VAfitted-Yimpact.txt The above B&K data has been processed using v12 of the "BandK_plot.m" Matlab script, available in the /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools$ directory. The merged plot attached below shows:- pg1 - Y response of the structure to Y hammer impact excitations at various locations, from 1Hz to 400Hz. pg2 - X response of the structure to X hammer impact excitations at various locations, from 1Hz to 400Hz. pg3 - X response of the structure to X hammer impact excitations at various locations, ZOOMED IN from 50Hz to 400Hz. n.b. hammer impact locations are viewable in the attachment to the original aLOG entry above see "Hammer_Impacts.pdf".
For acceptance review, I reprocessed the data for the beamsplitter, after seeing a legend mismatch between the plotted results and the raw data from PULSE software.
Therefore the attached results below are the ones to look at, and are following the accelerometer axis convention represented on the last attachement
(1) BandK_results_X_Exc.pdf
(2) BandK_results_Y_Exc.pdf
(3) Picture of BS with axis convention and hammer impact location
The X and Y hits have been chosen to correspond to the "Top Middle" hits on the picture
Those results in X to X (blue of 1st pdf) and Y to Y (green of 2nd pdf) are not showing any high Q resonnances below 150Hz, meaning the vibration absorbers are working as expected, and the test passed succesfully.
This measurement is now archived in DCC:
https://dcc.ligo.org/LIGO-E040512.