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Reports until 14:00, Monday 29 June 2015
H1 General
jeffrey.bartlett@LIGO.ORG - posted 14:00, Monday 29 June 2015 (19361)
08:30 Meeting Minutes
SEI:	
HAM6 close out and door install
Looking into some issues with HAM5
Running FF testing on HAM2

SUS:	
ETM charge levels are still good. They will be monitored to see if they return
Investigating 2 BOSEMs on TMS-X which are not responsive 

CDS:	
Working on mods to Beckhoff chassis in corner station

NOTES:	
There will be an Internet access outage on Tuesday from 09:00 to 10:00
Stripe Rite will be on site Tuesday to sweep along the X and Y beam tubes  
H1 DetChar (DetChar, SEI)
andrew.lundgren@LIGO.ORG - posted 15:34, Saturday 27 June 2015 (19359)
High-frequency once per seconds sweeps in HAM4 GS13 during ER7
While following up some hVeto results, I came across some very strange signal in ISI-HAM4_BLND_GS13Y. It's also in X and Z - I haven't checked other degrees of freedom or the raw GS13 signals. For several days, there's a sweep from ~700 Hz to 1024 (Nyquist) once per second. It doesn't seem to be quite aligned with the second. The first plot is an Omega scan that shows what it looks like.

The second plot shows the onset at June 9 16:49:54 UTC. The only thing I can find in the log is a restart of h1susb123 at 11:50 local (alog). I think this channel is SEI not SUS but maybe they share a front-end machine? The problem looks to be continuous until about June 13 21:30 UTC, third plot. I don't know what fixed it. There's more digging in we can do if needed. This is not a huge problem for detchar, the sudden change in the channel just caused some weird results in hVeto. We probably should be ignoring the high-frequency part of the signal anyway.
Images attached to this report
H1 SUS (SUS)
leonid.prokhorov@LIGO.ORG - posted 18:07, Friday 26 June 2015 (19357)
OPLEV Charge measurements
Leonid.Prokhorov, Jeffrey.Kissel

We repeated the charge measurements on both ETMX and ETMY. Results are close to yesterday's one. Plots of all measured data after discharging are attached.

In the morning we found both ESD drivers off and reset it (see alog 19341).

Today we have the scattering of data points for ETMY lower than yesterday with unknown reason. 
We presumed that it may be due to the optical levers centering and check the alighnment at last 3 days. 
for ETMY: Alignment was not very good today 0..-6(pitch) and -1..-2.5 (yaw), while there is the minimal scattering. The better alignment was at June, 24: -0.5..0.2 (pitch) and 0..0.3(yaw), when we have larger scattering.
for ETMX: Scattering seems more or less the same for all days, while OPLEV centering is really different (+6(pitch) and -10(yaw) at June, 24; -1(pitch) and 0..-0.2(yaw) at June, 25; 0.5..2(pitch) and -0.4..0.2(yaw) at June, 26)
So it seems like there is no correlation between alignment of optical levers and scattering of measured charge.

Sign of the pitch and yaw response on excitation with different bias voltage for ETMY was the same as in yesterday measurements, see plot.
Images attached to this report
H1 General (TCS)
nutsinee.kijbunchoo@LIGO.ORG - posted 17:49, Friday 26 June 2015 (19356)
Made changes to the TCS RH+Ops Overview medm screens

Ring Heater screen

 

Ops Overview:

Images attached to this report
H1 General
bubba.gateley@LIGO.ORG - posted 17:19, Friday 26 June 2015 (19353)
HAM 6 CLEAN ROOMS
Bubba  Gerardo 

We moved 3 clean rooms, several tables, and miscellaneous items left in clean rooms and on tables from HAM 6 area to a location in front of the Hi-Bay.

 We now have access for the east door to be installed and with a few strategic crane/fork lift moves, the south door will be ready to install.

 The garbing room remains powered up and in the same position as this week until the south door is ready for install, therefore travel on the south side of H-1 output is still restricted.
LHO General
corey.gray@LIGO.ORG - posted 16:00, Friday 26 June 2015 (19338)
Ops DAY Summary

The main installation activity today is closing out HAM6 work.  In parallel a couple of tasks went on:  (1)  Balancing the ISI & (2) Retrofitting top glass plate so it can be installed. 

HAM6 work is done in the chamber.  The day ended with prep work (moving cleanrooms) so the doors can be installed on HAM6 on Monday.  Before HAM6 is closed, the Signature Approval for Chamber Closure  will need to be filled out (E1500273).

LVEA was transitioned to Laser SAFE this morning.

Day's Activities:

H1 CDS
david.barker@LIGO.ORG - posted 15:45, Friday 26 June 2015 (19349)
FRS web link added to CDS LHO home page

FRS is now linked from the CDS home page.

H1 SEI
jim.warner@LIGO.ORG - posted 15:30, Friday 26 June 2015 - last comment - 19:58, Friday 26 June 2015(19343)
Issues with HAM5, probably caused HAM6 activities. Now with free (better) feedforward data.

I noticed this morning (through the Detchar pages, very sad that last nights SEI data isn't available) that the HAM5 ISI has not been doing well since about the time HAM6 vent activities started. Sadly this casts some doubt on the feedforward data I posted the other day, so I re-evaluated the performance at HAM4 while I was digging into HAM5. My first image shows the difference between HAM's 4 & 5 in the Y direction, all the other DOFs look similar. Second image shows the rotational dof's of HEPI L4C's on the two chambers, and HAM5 sees al lot more motion than HAM4 (dashed lines are HAM5, solid are HAM4). The translations are messier, (third image) but still seem to indicate more motion at HAM5. Hugh reports finding a few mechanical contacts at the chamber while he was working on HAM6, so I'll wait to panic about HAM5 until after that mess is cleaned up. Jeff is filing a report with FRS on this.

On to doing a better evaluation of RY feedforward on HAM'S : the fourth image shows the healthy HAM4 RY feed forward, dashed lines are off, solid are on. Fifth image shows that turning RY FF on has not spoiled the X performance.

Last two images show HAM4's Y and Z feedforward performance, with the same dashed/solid off/on convention.

Images attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 17:31, Friday 26 June 2015 (19355)DetChar, FMP
Opened FRS ticket #3240.
john.worden@LIGO.ORG - 19:58, Friday 26 June 2015 (19358)

Keep in mind that the mechanical loads on the HAM6/HAM5 vacuum chambers have drastically changed. Prior to the vent HAM6 was supporting the 42000 pound atmospheric load applied at the East door but now this load is applied at the septum plate. The septum is bolted hard to HAM5 and coupled to HAM6 through a bellows so this load is now applied to HAM5. I don't know what impact this might have on the ISI but the reactions from the floor have certainly moved. Perhaps local tilt has changed?

H1 CDS
david.barker@LIGO.ORG - posted 15:26, Friday 26 June 2015 (19347)
FRS web page inaccessible from CDS workstations

Jeff, Dave, Jonathan, Ryan:

Jeff K noted that the FRS web service was inaccessible from LHO CDS workstations this afternoon. We raised this as FRS-3241. Jonathan H and Ryan B did some analysis on the problem and suspect it is an issue with LLO DNS when clients use  root-DNS. I opened a LLO GC fault ticket  FRS-3242 and closed out FRS-3241 Until a fix has been implemented, I have reconfigured the internal CDS DNS server to resolve the fed.ligo-la.caltech.edu address internally. This is just a short term fix.

H1 SYS (ISC, SEI)
hugh.radkins@LIGO.ORG - posted 15:21, Friday 26 June 2015 - last comment - 16:49, Friday 26 June 2015(19345)
WHAM6 Further Status Update

With purge on and both door covers open 2' outside of -Y door plane:  Dust counts all zeros!

While Matt was prepping to cut glass, Greg & I did the major rebalance of the ISI.

After Matt got the modified OMC shroud pieces reinstalled, Greg and I completed the ISI rebalance--I'll detail next.

Just before recovering the openings, -X of South Door:

100/0/100/0/200/100 counts for 0.3/0.5/0.7/1.0/2/5/ particals

Got the covers secured and free of the Optical Table with the purge turned down.  Jim made quick TFs (will log seperately) and they look fine.

Dan took over next and reports the OMC is still in good shape.

I've completed a thorough visual inspection and as-built of the new mass layout.

Thanks to GregG who spend nearly four hours in chamber.

Comments related to this report
jim.warner@LIGO.ORG - 15:25, Friday 26 June 2015 (19346)

HAM6 ISI looks healthy after a quick l2l  transfer function. See attached spectra. Resonances all look similar to last known good tf's.

Images attached to this comment
hugh.radkins@LIGO.ORG - 16:31, Friday 26 June 2015 (19350)SEI

I've added my as-built for the WHAM6 mass balance to the DCC at D1201388-v4.

hugh.radkins@LIGO.ORG - 16:49, Friday 26 June 2015 (19351)

Here are trends of the vertical CPSs indicating how well re-balanced the ISI is after the shroud install.  The trend is ~15 days and you can read the current CPS readings on the medm.  The ISI is not isolating so this is the free hanging position.  The error is less than 100 counts (a few um,) plenty close.

HEPI remains Locked

Images attached to this comment
H1 CDS
david.barker@LIGO.ORG - posted 15:20, Friday 26 June 2015 (19344)
new tables installed in computer users room

Our new tables for the computer users room were installed today. This required the power cycling of several CDS workstations.

H1 AOS
matthew.heintze@LIGO.ORG - posted 13:10, Friday 26 June 2015 - last comment - 17:15, Friday 26 June 2015(19342)
OMC glass black shroud install complete

Matt H, Bubba G, Greg G, Jeff B, Calum T (remotely), Eddie Sanchez (remotely)

 

If you remember from yesterday with all the glass pieces of the OMC shroud in we had a cable interference with the shroud (see pic 2424).
 After playing with the cables the decision was made to pull the two interfering panels out so that the cables would hang free (see pic 2431). This however leaves the to now open and exposed (pic 2459). So after some discussion last night we decided to try to score and snap part of the black glass to stop the interference but also so that we could get the plate back in.

 

By looking side on (pic 2469) we could use the holes that the capture screws go in a s a guide to where the cables interfere with the black glass and how much glass we wanted to remove.

 

We decided to remove around 2.25 " (see plate mod pdf)...so it should hopefully look like "OMC3D" pic

 

With a brand new glass cutter we practiced on some test piece bits of black glass Calum had sent Betsy. The trick is to only do one 'score" with a light but even pressure, and then put the pressure over a raised surface (say a small diameter smooth rod), and then with gentle and even pressure that is spread out, push down and will get it to snap along the score.

 

Once happy with our technique, we went out and did it to the two real pieces. After of course the old carpenters trick of "measuring twice cutting once" :-) Worked like a charm. John W, gave us a small file (diamond tipped I think) to just gently bevel the edges a tiny bit to take off the sharp corners. That also worked really well. We then cleaned it by blowing it down with top gun, and then in area that snapped giving it a methanol rinse.

 

It went back in no problems at all. Its done.

 

Pic 2497.....before pic of one of the glass pieces to be cut

Pic 2498......after its been "modified"

Pic 2504...drying after methanol rinse. Thats the AR coated side you see

Pic 2506 & 2510.....The now complete OMC black glass shroud installed

Images attached to this report
Non-image files attached to this report
Comments related to this report
koji.arai@LIGO.ORG - 15:30, Friday 26 June 2015 (19348)

It was a nice recovery!

It seems that the picture 2506 shows that one of the bosem cables was touching these two white cables.
It's not obvious from the picture 2510. Has this rubbing been fixed between these two pictures?

daniel.hoak@LIGO.ORG - 17:15, Friday 26 June 2015 (19354)

Ahh, I meant to double-check this clearance - thanks for the reminder.  I just went back into the chamber, there was no contact between the white (PZT?) cables and the black BOSEM cable, but I fiddled with the BOSEM cable to provide more clearance.  The attached pictures aren't terribly convincing by there's more than an centimeter of room between the cables now.

Images attached to this comment
H1 CDS
patrick.thomas@LIGO.ORG - posted 16:05, Thursday 25 June 2015 - last comment - 10:41, Monday 29 June 2015(19330)
end Y chassis 3 updated
Filiberto, Patrick

I didn't realized it had been removed, and except for communication errors with the missing chassis, the PLCs ran on without apparent incident.

Filiberto made the same modifications as to the one at end X and reinstalled it. I updated the system manager accordingly, checked it into svn and activated it.

This time I didn't restart the PLCs, but I still had to restart the EPICS IOC. I burtrestored to 6:10 this morning.
Comments related to this report
filiberto.clara@LIGO.ORG - 10:41, Monday 29 June 2015 (19360)
Both End Station Controls Chassis 3 were updated to wiring diagram E1400317-v2.

The following beckhoff modules were installed:
QTY 6 : EL3104 Analog Input Terminals
QTY 1: EL9410 Power Supply Terminal for E-Bus

New modules inferface with ALS WFS Demodulators and MCL PZTs.
H1 SEI
jim.warner@LIGO.ORG - posted 14:27, Tuesday 23 June 2015 - last comment - 16:54, Friday 26 June 2015(19292)
RY FF on HAM ISI's

In an email conversation Norna had asked what we could do to reduce motion on the HAM's in the RX/RY dofs at 25-35 hz. This morning I took a few measurements to design a FF filter. I've taken a first pass at it and I think I have something that works. Attached spectra are of the ground STS X and GS13s in RY the first png, then both sensors in X on the second plot. The live measurements are with FF on, references are from a quiet time last night, FF off.

The third attachment is a plot from the script I used to do the filter fit. Blue is the filter, green is the ideal fit from the St0 L4C's to the ISI GS13's, red is the fit from the HEPI L4C's to the ISI. The design approach is exactly the same as I talked about in my alog 18045.

Images attached to this report
Comments related to this report
jim.warner@LIGO.ORG - 14:51, Tuesday 23 June 2015 (19293)

I also have Y and Z feedforward working on the SRC HAMs. I attach performance plots (taken at the same time as the plots from my main post). These have been running on HAM4 for a little while (sometime after ER7 ended), but I never got around to doing the alog and I was a little more organized when I installed them on HAM5 today.  First plot is Y, second is Z. Active measurement is with FF on, reference is FF off. Again, we really need a cavity to say if these are good enough, but I leave them running for now.

I've looked at X, RX and RZ, but RX and RZ show low coherence and X looks... messy, see last plot.

Images attached to this comment
norna.robertson@LIGO.ORG - 14:56, Tuesday 23 June 2015 (19295)
That was quick! Looking good.
Thanks.
jeffrey.kissel@LIGO.ORG - 19:45, Tuesday 23 June 2015 (19300)
J. Kissel, J. Warner

Some additional information and/or a "current status:"
ISIs HAM2 and HAM3 do not have any ST0 / HEPI L4C feed-forward running.
ISIs HAM4 and HAM5 have Y, Z, and RY ST0 L4C (not HEPI L4C) feed-forward running.
(HAM6 is currently vented and the ISI and HEPI are locked.)

The HAM4 and HAM5 filters, for Y, Z, and RY live in FMs 2, 3, and 4 respectively. The gain for all DOFs on both HAMs is 0.5.

Norna's designing / modelling how adding blades between the HSTS's lowest stages will improve performance in the SUS's vertical displacement. The input motion for the SUS's suspension point in vertical is composed of the ISI's center of mass moving in Z, RX, and RY (see T1100617). She noticed from the results Jim posted (T1500289), that at 25-30 [Hz], the input V motion was dominated by RX / RY of the table. So, among other ways to improve the performance at these frequencies (see them discussed in SWG aLOG 11327), Jim tried improving the RY DOFs today -- and won!

Nice work, as always, Jim!
jim.warner@LIGO.ORG - 16:54, Friday 26 June 2015 (19352)

There was a problem with HAM5 at the time I took this data. I've taken new measurements from HAM4, see alog 19343. Conclusions remains the same, I think, but the data is cleaner.

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