Transfer Functions are running over the weekend on HAM3-ISI.
The HAM-ISI master models were recently updated. We took a quick set of transfer functions (1 average) to make sure everything was OK. Time series for the CPS signals are attached.
The temperature controller for the SHG on ISCT1 is now working. I had made a mistake in copying over the system manager from the test set up to the corner, which would be easy to repeat. There are two inputs from the resistance measurement terminal, EL3692, there is SAI Inputs Channel 1 which has the status bits and something called value, which looks like the resistor value if you look at it in the online tab, but doesn't actually work, the one to use is under SAI Inputs Real Channel 1.
Szymon and Mark B. We extensively revised the TMTS model using first article data from Ken Mailand. The preferred model is now at ^/trunk/Common/MatlabTools/DoubleModel_Production/tmtsfa.m In conjunction with the DTT data plotting script ^/trunk/TMTS/Common/MatlabTools/plotTMTS_dtttfs.m it gives a respectable fit to measured data: ^/trunk/TMTS/H1/TMSY/SAGM1/Results/2013-03-14_1936_H1SUSTMSY_M1.mat ^/trunk/TMTS/H1/TMSY/SAGM1/Results/2013-03-14_1936_H1SUSTMSY_M1_ALL_TFs.pdf The biggest mismatch is that an R (Mathematica/Matlab pitch) mode predicted for 0.6 Hz is observed at more like 0.7 Hz. Everything else is pretty much bang on.
Per request of Jeff K, the parameter file tmtsfa.m (r4480) was later renamed tmtsopt_firstarticle.m (r4526).
So, the afternoon BS FC application/removal indeed picked up the hazy 3" circle at the 3 o'clock position and the FC remnants at the center of the optic. However, there are now little "splatter dots" across the ~entire surface, 1-3 every inch. Some are a little circle like feature, as if we "sprayed something wet on it" and it dried in small dots - ha. So, I'm certain these are from the FC spray drying faster than I could spray - even when I was anticipating this and sprayed fast to try to avoid this. Possibly a subsequent FC cleaning could remove these, but I'm out of time to keep performing this few hour long task again and again. Will confer with CIT regarding cleaning in 2 months.
Arnaud and Travis finished reassembling the BS EQ stops and ellipt baffle and took B & K measurements, so we are done there.
Note, we have officially walked away from HAM 2/3, turning them over to SEI who are now TF'ing. Which brings me to the PRM - the FC cleaning of this guy was a failure as there is major smearing/contaminant on the HR surface (see pic 3 attached). Of course, this is the one I did completely by myself without the Margot/Kate help, so apparently I did something wrong although not sure what since I was following their procedure and working with them. Michael reminds me that we do not used PRM in HIFOy so we will revisit cleaning on PRM again in 2 months. The MC1 - 3 FC cleaning this week removed some particulate although all 3 mirrors have a few particles within the central 1" area - particulate that I could not blow off with deion' N2.
Phew - SUS is finally done in HAM2, 3, and BSC2 - for NOW.
PRM pic.
Sheila, Kiwamu
We went to the PSL room today to look for any sign of the beam distortion which we saw yesterday on ISCT1 [1].
However there was no obvious sign of the distortion in the PSL.
We are planning to look at the beam around the light pipe by removing it once we transition to laser hazard.
We brought a Thorlab beam scan to check the shape of the beam in the downstream after the ALS Faraday. We checked the beam shape at various points : (1) right after the first lens behind the Faraday, (2) before the first steering mirror (~30 cm afar from the 1st lens), (3) right after the lower periscope mirror and (4) right before it enters the penetration hole. None of them showed any obvious sign and they looked quite "Gaussian" copmared with the software fitting curve on them. Probably it is unlikely that the source of the distortion is in the PSL side.
[1] LHO alog 6050 " ISCT1 work"
08:00 Reset all the alarm handlers 08:30 DOE start seismic testing (Local) 08:45 LVEA Transitioned to Laser Safe – Michael R 08:55 Start Transfer Functions on HAM2/HAM3 suspensions – Arnaud P. 09:00 Patrick drive to End Y to check on Dust Monitor 09:15 Start work on BSC2 Beam Splitter – Travis S. 10:00 Reset Watchdogs on PSL – Michael R 10:10 Start assembly work on H2 LAE PCAL – Pablo/Michael R. 11:15 DOE stop seismic testing 11:25 Dust Monitor Installation on End Y - Patrick 14:00 DOE restart seismic testing 15:00 Start B&K Hammer Measurements on BSC2 Beam Splitter – Arnaud/Travis 15:55 Start measurements on HAM 3 ISI – Hugo P
Pablo, Michael R
We began assembling our second periscope structure in the H2 PSL room. We have the installed the struts, lifting block, suspension rings, and have attached the two large plates together through these pieces. We installed helicoils on plate -727, but we need to torque our screws down before we can flip the structure to get to the other plate.
Yesterday, we pulled the BSC2 CPS racks so Filiberto could do some mods to the cards. This afternoon the now fixed (we hope!) racks were replaced at BSC2. These are currently the only CPSs on site that have been modified. The rest are planned to be done during pumpdown over the next couple of weeks.
HAM3 ISI is unlocked. Hugo will be starting TFs soon, so steer clear, please.
Today, Travis pulled the FC sheet on the BS optic, in prep for final SUS pointing measurements now that the SEI actuator housings have been attached. However, the sheet did not come off cleanly and there are numerous bits of very thin FC in the center of the optic, specifically where the thin windows were. As well, there is a full circle of haze where one of the thinner FC windows was pulled off at the 3 o'clock position. So, we sprinted to get the BS FC spray cone cleaned (no time for full class B at this point, but these are a tool that do not touch hardly anything so we're going with it) and will attempt a recleaning this afternoon. Note, I can't leave the FC sheet on because IAS/AOS need to see through the BS in order to look at the position of the elliptical baffle boxes (shown in the back ground of many pictures linked below).
Recall that the FC-HR sheet originating from CIT many months ago looked like this:
And here's after the FC was removed (using many minutes of N2 deionizing flow for particulate reduction):
And here's the picture of the ~3" circle of FC residue (???) at the 3" position. Interestingly, there was another 3" window at the center of this window and we could not see any such haze left from that window! There are also a few strips of FC shown at the edge of the optic in this picture.
Note, I do not anticipate the FC coning to go smoothly this afternoon since Margot, Kate and I ran into some issues with the small cone we used in HAM2/3 and this is a new unit which is being used for the first time for the BS.
I and Joe went to EY and checked the viewports there, and everything is good.
BSC6: 4/4, all good.
H2 EY adapter A-17B: 5/4, we have one viewport more than we need.
MC1 transfer functions ran last night before closing HAM2 chamber look very good.
Measurements can be found attached :
The svn will be updated by the end of the day when measurements will be done
Tonight Kiwamu and I started aligning the doubling path on ISCT1, first Kiwamu locked down the table legs and I moved the periscope about 2 inches to the north, and centered the beam as well as I could on the mirrors and leveled it. The beam was large enough to clip on the one inch mirrors so we put a f=600 2 inch cvi lens right after the bottom periscope mirror. We noticed that there are ghost beams coming from both the 5% reflector and the mirror after it; changing the polarization did not seem to change the power in the ghost beams. After adding an iris we tried to measure the beam profile using the pick off for the DC PD path, but saw that the beam is non gaussian. We checked the beam profile right after the 2 inch lens to make sure the 1 inch mirrors are not at fault, and the beam is still non gaussian when there are no 1 inch mirrors in the path.
Starting several rounds of transfer functions overnight for phase 3a testing prior closing HAM2 HAM3 chamber.
Measurements will run until tomorrow afternoon, and will be paused if needed to go in chamber.
all suspensions passed phase 3a testing prior to ham2/ham3 close up. plots will be updated on monday
We've checked the status of viewports that are necessary for HIFO in the LVEA in the morning. We haven't checked if correct viewports are in, only the number and positions of the viewports.
We've found that total of 10 viewports are still missing.
Also, since we don't have ITM baffle, it might help to add a camera viewport for IY (BSC1) from the HR side just under the illuminator, i.e. G2. In OAT we couldn't tell from the spool camera view if the beam is centered on ITMY or not simply because the camera on the IY Adapter was too far (though a good zoom lens would have helped).
Tomorrow Joe will go through the inventory and hopefully find the right ones. We'll also have a look at EY viewports.
Edit: It's already tomorrow from yesterday's point of view, and we confirmed that EY viewports are all there.
HAM1: All good, 7 called for / 7 installed. Note that HAM1W and HAM1E doors are physically labeled 'HAM2W' and 'HAM2E' for historical reasons. I'll use Sharpie to correct the problem if it's not fixed soon.
HAM2: All good, 18/18. HAM2W and HAM2E doors are physically labeled 'HAM1W' and 'HAM1E' bla bla. Sharpie bla.
HAM3: All good, 4/4.
WAMCA1 (MC tube attachment by HAM2): 2/3. One missing. Also one is using a different location.
WAMCB1 (MC tube attachment by HAM3): 2/7. Five missing.
IY Adapter WA-1F: 2/3. One missing.
BSC2 (BS): 1/3. Two missing.
BSC1 (IX): 1/2. One missing.
WAMCA1 pictures. First one is taken from the East, showing that nothing is there though there should be video PR2 at least.
The second one is from the West, showing Video MC2 (middle) and OptLev HAM3 (displaced from the east bottom to the west bottom).
WAMCB1 pictures. The first one is the east side showing nothing, but there should be OptLev PR3 OUT, Video MC1, Video PRM and OptLev PR3 IN.
The second one is the west side showing two of three viewports that should be there. The one missing is Video PR3 at the top.
IY adapter pictures. The first one is from the north side showing OPTLEV ITMY-IN at the bottom, which is good.
The second one is the south side which shows OPTLEV ITMY-OUT at the top, but not ITMY Video viewport in the middle.
BSC2 pictures. It's kind of hard to see, but the four pictures show four viewport columns in NE, NW, SW, SE.
NE has OptLev BS, which is good.
NW is totally closed, which is how it should look.
SW is supposed to have illumitator at the top and BS Video in the middle, but they're not there.
SE is totally closed, which is how it should look.
BSC1 picture from the south side. Illuminator is at the top left, which is good.
ITMY-CP Video is missing from the middle right. It's not a tragedy if we don't have this one for HIFO.
The HAM3 OptLev does receive the output beam out of VP7 on WAMCA1 so that works fine.
Modified capacitive position sensors per E1300251 for BSC2. This was to address a high frequency oscillation in the return path. Filiberto Clara
CPS Coarse: SN 13201, 13183, 13419, 13528, 13454, and 12953 Resistor R55 was replaced with 51.1 Ohm. CPS Fine: SN 13230, 13238, 13418, 13439, 13450, and 13452 Resistor R55 was replaced with 51.1 Ohm. Resistor R81 was replaced with 1.47K Ohm.
