TMSX (TMTS) M1-M1 TFs suggest recovery of split T DOF peak

TFs taken on the TMSX (TMTS) suspension over the previous evening indicated an issue with spitting of the 2nd T DOF peak (see LHO aLOG entry 13066).

BOSEMs were re-centered by Gary (et al) and Keita inspected the suspension, subsequently giving it the all clear (see LHO aLOG entry 13088). Another round of TFs have been taken this afternoon for TMTSs at both ends, for comparison, as follows (noting that TMSY is in-vacuum):-

- TMSX M1-M1 undamped (2014-07-30_1400_H1SUSTMSY_M1_ALL_TFs.pdf)
- TMSY M1-M1 undamped (2014-07-30_1400_H1SUSTMSX_M1_ALL_TFs.pdf)

BSC9 ISI Status: ISI damped.
BSC10 ISI Status: ISI damped.

TMSX alignment: No offset was applied during this measurement.
TMSY alignment: P = -129 urad and Y = +1 urad during this measurement.

The above measurements have been compared with other H1 TMTS suspensions, also at Phases 3 of testing (alltmtss_2014-07-30_Phase3a_H1TMSX_M1_Doff_ALL_ZOOMED_TFs.pdf), the plot key is:-

Blue Trace = Model Prediction (tmtsopt_production).
Orange Trace = H1 TMSY M1 (2014−07−30_1400), Phase 3b (in-vacuum). 
Black Trace = H1 TMSX M1 (2014−07−29_1090716348), Phase 3a (free-air). 
Magenta Trace = H1 TMSX M1 (2014−07−30_1400), Phase 3a (free-air). 

Summary:

TMSY is exhibiting split L, V, R and P peaks (as expected) and is consistent with previous Phase 3b (in-vacuum) measurements (not shown).

TMSX is a closer match to the model and, interestingly, with the latest measurement the 2nd T DOF peak appears no longer to be split.

Matlab TFs have been running on TMSX again this evening (to verify recovery of split peak), but all looks clear to proceed with the close-out of BSC9 chamber in the morning.  

All data, scripts and plots have been committed to the sus svn as of this entry.

Output Septum Update

(Ed, Gerardo)

Two of the 3 ports are done, we installed blanks on VP1 and VP2, both were installed per procedure.

No glass was installed on VP3, because while we were busy prepping the blanks for the septum, someone took our staged top gun.
After installing the blanks, the glass viewport was prepped and is now ready for installation, I had to cobble together another top gun to remove the FC from the viewport.
 

H1 SUS ETMX Go for launch

J. Kissel

Took some in-air transfer functions of H1 SUS ETMX, hoping for green light to close up tomorrow. With tHPI robust isolated, and the ISI damped, the QUAD's TFs look virtually identical to the same measurement taken Dec 2013. See attached.

I've left the ETMX chamber with HPI robust isolated, the ISI loops all OFF, and the QUAD damped for Jim's measurement. As of this entry, the TMTS is still undamped, but on the 5th of 6th DOFs, and is programmed to turn damping loops ON when finished.

H1 SUS ITMY Free and Clear

J. Kissel, B. Weaver

After Jim and Travis unlocked the H1 ITMY ACB and the ISI, we quickly measured a few DOFs of H1 SUS ITMY (with HPI robustly isolated, and ISI damped) to confirm the SUS is now free, and was suffering from cross-coupling of the ACB suspension to the QUAD via a half-locked ISI (as suggested here). We have, and it is free. Indeed, we went so far as to fill out our H1 SUS ITMY directory with a plethora of transfer functions, gathering all DOFs with damping ON vs. OFF. With this data we can show that what is left of the 2.4 and 2.6 [Hz] resonant features that have been plaguing us for the past few days is not unexpected (no signs of 2.4 [Hz], and the ~2.6 [Hz] feature that's left in M0 V2V is a cross-coupled roll mode), and is happily damped out with the control system.

Close the chamber! Close the chamber!

Well, lock up the SUS real quick, peel off first contact, unlock the sus, measure TFs again, that THEN close up the chamber...

Note -- I haven't looked in a while, but we *really* should put more effort into the reaction chain damping filter design. And I'm sure by "we" it means me.

Testing conlog code on h1conlog2 overnight

ITMy L1-L2 tfs will start at 19:23 on opsws1

ISI is damped

Unsure of in what state to leave the ITMY chamber, I turned OFF the damping loops for M0 just after the measurement start alarm, but I've only realized just now (~1 hour into the measurement) that I left the R0 damping loops ON. HPI remains robust isolated, with the ISI with both stages damped.

BSC3 ITMx status

Betsy, Travis, Andres This afternoon, we started the chamber closeout steps. We: Locked the ITMX TM and CP masses in prep for FC removal. Started to clean the barrels of the optics. Started locking down all loose nuts on the SUS. Set the BOSEMs to account for the buoyancy effect under vacuum. Assisted with TCSx in chamber mirror alignment. Prepped the N2 gun and bottle for in chamber use. Took lots of particle counts. Wiped down as mush of the VS and ITMx as possible. Wiped the floors of BSC2 and 3 numerous times. Counts were high during and just after the wiping. They did not return to zero by the time we left the chamber at 4ish. Counts data to follow. Will wipe once more before pulling the FC tomorrow morning and putting the door on.

IMs tfs are clear

After HAM2 doors went on, IMs tfs were ran last night (IM1 IM2 IM3 and IM4). The ISI was damped during the measurement. They are showing good agreement with the model, similarly as before HAM2 closeout. The results are attached below showing a comparison between all the IMs and the model.

Data and scripts were commited to the svn, particularly plothaux_matlabtfs.m (under sus/trunk/HAUX/Common/MatlabTools) with the corrected calibration (thanks to Jeff)

TCS CO2 Optics Alignment

Travis S. Gary T. Matt H. Greg G.

Final (hopefully!) alignment of the in-vacuum optics for TCS was completed today. ITMx had already had an alignment done by Thomas Vo and myself last month, but Travis and I made sure things were well centered on SM1 in BSC3. A range of motion test showed no clipping throughout the compensation plate for ITMx.

For ITMy I was aided by Gary and Matt. ITMy was an initial alignment and took a little more finagling. The periscope on the table had to be adjusted a bit, and some small adjustment to SM1 was done; but otherwise alignment went smoother than I expected. The beam is traveling a little high through the outside viewport optic on BSC1 but is well centered on the inner optic. The range of motion test showed there to be clipping on the Y arm elliptical baffle towards the upper range of motion.

Matt noticed irregularities on the surface of the mirrors and will hopefully be able to post pictures later.

Thanks to Betsy

45Hz in lowest stage of PR2

Following on after-HAM3-closeout tfs results of lowest stages of PR2 -which were showing high q resonant pole at 45 Hz in the M3 L-LR transfer function-, and in order to determine if the problem is in chamber or in the electronics chain, I swapped middle stage and bottom stage cables at the in-air vacuum flange of HAM3 (respectively H1:SUS_HAM3-25 and H1:SUS_HAM3-26), and took those measurements again.

As showed on the attached screenshot, the pole moves to the M2 LR-LR tf after swapping the cables, and disappear on the M3 LR-LR tf, which eliminates issues in the electronic chains, and indicates that the problem is in-chamber.

Obviously, the cables were swapped back to their nominal position

It should be noted that the 45.3 Hz feature is also clearly visible in the power spectra for the M3 LR channel (see attached), which may also help with quick diagnostics/debugging in future.

Matlab TFs running on TMSX (TMTS) overnight

Matlab TFs are set to run at the X end station overnight as follows:-  

- TMSX (TMTS) M1-M1 undamped TFs

Starting now, and when complete the measurement status will revert to OFF and damping loops will be restored to the ON state.

These measurements have been initiated from the opsws2 workstation.

These should wrap up with plenty of time to spare before Jim's measurements start.

BSC9 Closeout Status

Gary, Matt, Danny, Keita, Stuart, Norna

-First contact was applied to an ALS view-port.
-UL AOSEM was swapped as a noise check.
-Noise spectra for the OSEM was ran in several scenarios.
-TMSX was checked for rubbing.
-TMS BOSEMS were centered without the offsets.
-UL AOSEM was put back into the PUM and its flag was re-centered. (seems as though the noise is from an SRS cable at the feed through)
-First contact was removed from the view-port.
-View-port was inspected with green light.
-Both suspensions were left unlocked for TFs.

Things left to do:

-Lock ETM for first contact removal.
-Remove first contact.
-Inspect the optic with the green light.
-Swing the baffle back down.
-Unlock suspension and set the EQ stops and lock the nuts.
-Center OSEMs if needed.
-Run quick TFs for rubbing check.
-One last wipe down.
-Replace door.

CC wafers will be added to the chamber at the proper time.

Note: The floor was wiped after every exit today totaling 3 times. 

Particle counts in todays x-end station work

Going to be lazy and do it via photos. The titles of the photos tells what was going on:

 

So one thing to look at is the later photos where side by side I have showed the counts reistered by the particle counter Jeff has been using (white casing Met one particle counter) compared to the syle of particle counters avaialiable to on-site personnel (grey casing Met one particle counter). These readings were taken at the same time, in the same place, for the same duration. Gary was the first to point out to me that to first order the White casing Met one counter is a factor of 10 lower than the grey casing met one particle counter. Is there perhaps a setting that is wrong on one of them, as this isnt the case for just one reading but al lthe readings taken side by side with the two counters.

ETMy HEPI Position Loop Targets

Wanted to confirm the target numbers for the ETMY position loops.  The Rx & Rz positions have been at their target positions since it appears the HEPI was partly locked late March.  Before that lock and subsequent HIFOY the Rz was drifting to -20000nrads which was a good place for IAS--see alog 10765.  However, when the HEPI was locked, it was pushed and drifted by early April to ~6000nrads.  The Bias Target position is and has been set to 6700nrads.  If the IAS alignment is still valid under vacuum, these target might be more help at -20000nrads.  The Rx similarly moved from 2000 to -12000nrads when HEPI was locked.  The Bias Target is currently -10900; likewise, it might relieve TMS or others to be reset to 2000.

Attached is 120 days for Cart Basis Positions with the notes of use.

TF set to run on ETMX ISI, ~2215 local

Giving Jeff and Stuart 6 hrs to run their measurements. I cut down on reps for less important frequency bins, so maybe done in the morning.

Daily Shift Summary

9:00 Travis, Me to ITMY to unlock ISI
9:00 Corey to lvea for 3ifo enclosures
9:15 JeffB to HAM6 for door pull, out at 10:15
9:30 Surf students to EX for EE work
9:30 Karen to EY, back at 10:45
10:00 Nathan to optics lab, turning on laser
10:15 JeffB to EX
10:45 Jason to LVEA to look at ITMY
11:30 Jason to LVEA, tearing down IAS, out at 12:00
13:00 Betsy, Greg to BSC3
13:00 Mitch to CPB install, out at 15:45
13:15 Manny to Ex looking for stickers
13:15 Gerardo to HAM6
13:15 Gary, Matt, Stuart to EX
14:45 Arnaud to HAM3, swapping pr3 cables
15:15 PEM crew to mids and ends to retrieve gear

First contact removal from HAM4 door viewports

Apollo, Matt

When we put the north door on HAM4 last week, we noticed that first contact was still on the inside and outside of the viewports. This morning Apollo pulled the two viewports in question off the door (I did particle counts of the cleanroom and of the purge coming out of the chamber through the viewport aperture on the door and all counts zero).

The top gun was used in the removal of the first contact to blow during and after the first contact was peeled. The first contact must of been some of the original first contact and been on there a long time as it took quite a bit of force to "break the seal" to get the first contact to start to peel (it was a pour application of FC on the viewport it appeared).

After peeling I inspected the viewports. The one that came off the centre of the door looks like it has a scrath..and I want to say its on the inside, and its not in the centre but off to one side, perhaps 1-1.5inches long,  but I only had a quick look and pass it off to the experts to do a more detailed look as I didnt have any swabs, etc on me to investigate it. I shoudl of taken a picture. Didnt even think of that I am sorry. In the meantime I asked Apollo to put a blank on that port. The other viewport looked fine and so I informed Apollo to put that one back on in the same spot it came off.