HEPI/Cleanroom interference at BSC1 and BSC3

Although it seems the watchdog trips at the ITMs are understood, there is now another variable to consider.  The cleanroom that has been inserted into the beer garden for the upcoming ITM swaps has some of it's curtains draped over the HEPI crossbeams.  With the cleanroom not currently running and no plans to move the cleanroom in the near future, the interference should be rather static.  See pics for a reference to the extent of the interference (and let us know if it is a problem).

ITMX ISI watchdog trip plots

Possibly due to craning in the LVEA.

ETMX ISI L4C watchdog trip plot

Tripped April 15 17:10:34 PDT.

CDS model and DAQ restart report, Tuesday 15th April 2014

model restarts logged for Tue 15/Apr/2014
2014_04_15 11:35 h1hpiham4
2014_04_15 11:38 h1pemcs
2014_04_15 12:15 h1broadcast0
2014_04_15 12:15 h1dc0
2014_04_15 12:15 h1fw1
2014_04_15 12:15 h1nds0
2014_04_15 12:15 h1nds1
2014_04_15 12:16 h1broadcast0
2014_04_15 12:16 h1fw0
2014_04_15 12:20 h1hpiham5
2014_04_15 12:23 h1hpiham2
2014_04_15 12:23 h1hpiham3
2014_04_15 12:26 h1hpibs
2014_04_15 12:26 h1hpiitmx
2014_04_15 12:26 h1hpiitmy
2014_04_15 12:28 h1hpietmx
2014_04_15 12:28 h1hpietmy
2014_04_15 12:29 h1hpiham6
2014_04_15 16:39 h1susquadtst
2014_04_15 21:03 h1fw1

A busy maintenance day. All restarts expected except the second start of h1broadcast0 and the later restart of h1fw1.

Optical Lever Damping Cleanup

J. Kissel, A. Pele

We've begun the clean up and unification of design for optical lever damping that has begun to slowly and differently percolated through suspension types and sites. Arnaud has created a library part called 
${userapps}/release/sus/common/models/FOUROSEM_STAGE_MASTER_OPLEV.mdl
a week or so ago which has been used in the modified 
${userapps}/release/sus/common/models/QUAD_MASTER.mdl
part which covers a generic QUAD suspension. However, there were still a few bugs in that library part which I fixed up:
 - breaking a vestigial link to the beam splitter master library part, 
 - connecting the ODC damping status up and out to the top master level adding two new bits

We've not compiled anything and the MASTER model parts remain uncommitted. We'll compile, install, restart, and restore, and then clean up MEDM screens tomorrow.

Note that we are cleaning up this stuff so that we can make progress on all of the ECRs that HAVE been approved, including watchdog clean up, adding EPIC storage of alignment offsets, adding dither alignment paths, and adding BSFM M1 to M2 stage damping. 

Debate over whether to include optical lever damping in DRIVEALIGN path (which contains frequency dependent alignment decoupling [say if the P2Y coupling is large] and the plant compensation filters [to convert complicated P2P and Y2Y transfer functions into single-pendulum-like transfer functions]):
- Currently QUADs feed optical levers through DRIVEALIGN matrix, motived with the argument that "we shouldn't have 10 different paths to actuate on a stage. If we put the effort into 'diagonalization' of one path, it should apply to all other control loops."
- The BSFM does NOT feed through, because it was put in quickly before any such discussion was had, or any effort was put in to 'diagonalization'
- The HLTSs currently have no optical lever damping, but LLO commissioners have requested it.
- If we use Arnaud's FOUROSEM_STAGE_MASTER_OPLEV for all three (QUAD, BSFM, and HLTS) suspensions' lower, FOUR OSEM stages, then we'd only have one library part to maintain. Good.
- HOWEVER, we've already approved to have M1 to M2 stage damping on the BSFM, which means it's M2 (FOUROSEM) stage has to stay unique.
Gosh darn it. Note LHO hasn't measured if we see the same SNR and damping improvement that LLO got from this unothordox extra damping...

TCS update/status

DavidH, Greg, Thomas

TCSX: Plumbing sorted (except for one last connection to water-cooled beam dump, awaiting fittings), optics mounted and optical mounts are positioned on the table ready for alignment. Optics that are not within table are accounted for. Last few cables are to be connected.

TCSY: Enclosure re-cleaned, plumbing connected up (except for beam dump) and water manifolds in final positions, laser/RF driver cables are all dressed and connected to feed-throughs.

See images for current TCSX/Y table layouts

They were found in the enclosure after David was able to tidy up.

WHAM5 SEI HEPI Activities/Status--2 Actuators Attached, 6 to go

Late start but this morning I lifted the HEPI with it's DSCW Springs to pull the elevation within spec: -325.7mm vs -325.3 so less than 0.5mm low.  The Dial Indicators show that the position remains within spec.

After that, I got the first Horz L4C Leveled and then the first vertical Actuator attached.  After lunch (1400) Scott joined me and we leveled another L4C and attached the second vertical Actuator.  The 3rd L4C is leveled now and we'll continue tomorrow.

Departed the LVEA ~1645pdt.

Started h1susquadtst model in LVEA

WP#4553

I modified the h1susquadtst model to use the latest QUAD_MASTER model. I terminated the new ports. This permitted the build and install of the h1susquadtst model, which was then started on the h1susquadtst computer (located in the LVEA in the old H2 One Arm Test racks). This model will be used for SUS work in the LVEA on the test stands in the near future.

We decided to not add this model to the DAQ at the moment. We can add it later if needed.

This is not a standard front end, so I've greyed out non-applicable bits on the STATE_WORD overview.

This closes WP4553.

ITMX and ETMX damping now

ITMX and ETMX ISIs are damping now, so that seismic people (Rich) can get an input spectrum on a windy day. I will be walking around the end station optics table, but quietly. 

Sheila

Ops Shift Summary

8:05 Network work – Jonathan
8:32 Doing Baffle inventory by West bay (LVEA) – Jodi
8:35-9:28 CDs Digital Cameras EPICS IOC updates – Cyrus
9:15-12:52 TCSx table work (LVEA) – David
9:43 Water delivery
9:46-12:00 HEPI work on HAM5 – Hugh
10:35-12:28 Cable work on SR3/SRM (LVEA) – Travis
11:35 HEPI master model update - Hugo
11:37-14:20 Inspecting Voltage Control Oscillators in LVEA - Pablo 
11:40-15:06 Praxiar LN2 delivery to CP4 at MidY
12:14 DAC restart – Dave
12:55 Checking Dust Monitors in Optics lab – Jeff
12:56 Heading to End Y (cleaning) – Karen
13:16 TCSy table work (LVEA) – David
14:00 HEPI work on HAM5 – Hugh
14:25p-14:45 Taking a tour into the LVEA – Dale
14:40 Crystal chiller refilled (Maintenance) - Andres
15:30 Heading to EndX – Sheila
15:55 Heading to End Y - Pablo

CDS maintenance summary

WP#4569 Change name of h1peml0 model (Dave)

The name of the model h1peml0 was changed to h1pemcs to be consistent with the naming scheme and the internal channel names. The required changes to rtsystab,  testpoint.par, master (daq),  overview MEDM screens, H1EDCU_DAQ.ini

WP#4567 New HEPI models (Brian, Hugo, Hugh and Dave)

The new hepitemplate.mdl file was updated, and all eleven HEPI models were compiled and installed. At that point Hugo restarted the models and performed testing with Hugh. Please see Hugo's alog for details.

Weather Stations Added to DAQ

H0EDCU_WEATHER.ini was modifed to add back the EY and MY weather stations to the DAQ.

Digital Video EPICS channels added gto DAQ

A new H1EDCU_DIGVIDEO.ini file was created with all the EPICS channels for cameras 1 through 20. This was added to the DAQ master.

Beckhoff INI and REQ updates

The latest Beckhoff INI and REQ files were generated. No change to the INIs. One REQ channel was removed from ECATY1_PLC2. This required a reconfiguration of conlog, whose channel count decremented from 122,675 to 122,674.

DAQ Restart

To apply the pemcs and weather changes, the DAQ was restarted at 12:15PDT.

restart logs:

Maintenance

Crystal chiller refilled.

IMC was not locking, fixed by steering PZT pit

[Sheila, Kiwamu]

Sheila had a difficulty in relocking the IMC. So I looked into it to figure out what is happening and fixed it by steering the PZT pit.

It was apparently due to a misalginment, mainly in pitch according to the GigE views. Looking at one-day trend, I found that the PZT pit suddenly had changed its value from 400 to -240 counts at around 8:20 am local. A mysterious point is that , after the PZT jumped, the IMC was still able to lock itself for approximately 4 hours.Then it ran into a situation where it was not able to hit the LSC trigger. I didn't see a significant drift in any of the MC suspensions. I fixed it by steering the pitch of PZT back to +300 counts. It relocked right away and we ran the offload script so that it doesn't loose the good alignment by a unclok. We should keep our eyes on this PZT.

The attached is the one day trend.

H1-SR3 Phase2b Transfer Functions

Andres R. & Jeff B.

   We made several centering adjustments to the BOSEMs and reset all to 50% light. The latest set of transfer functions show the undamped coupling issues in the 03/25/14 data have been reduced or eliminated. The plots for the last set of TFs are attached below. The plots for the power spectra taken on 03/25/14 are also included.   

PRM TF round 2

Last friday, Betsy and Travis added weight to the middle mass of SRM currently on the test stand, in order to center the flags with the osems cf alog 8367. A first round of TF have been taken before that, showing clean measurements. A new set have been taken monday night to assess that there's no major change. The new results are showing an excellent match with the previous ones
 

Results in attachments are described below :

(1) H1 SUS SRM M1-M1 (top mass) comparison between modeled and measured undamped transfer functions for the 6 dofs

(2) H1 SUS SRM M1-M1 comparison between modeled and measured damped transfer function for the 6 dofs

(3) H1 SUS SRM M1-M1 undamped TF comparison before and after adding weight to the middle mass

data have been commited under the svn

PR3 H1 L1 spectra comparison

As for the HSTSs, I took a spectra of PR3 from Monday. The isolation and damping loops of the ISI were closed (isolation level 3), as well as the damping loops of the suspension. The chamber was still under vacuum. Status of HEPI needs to be double checked.

The attached plot compares the spectra of LHO and LLO PR3, in a similar configuration (ISI isolated, SUS damped), for the 3 levels (M1 M2 and M3) and every degree of freedom.

Looking at the plots, we can see that LLO get more isolation at each level, even though we are using the same damping filters. That said, Jeff discovered that the suspension medm gains are set to different values, (higher values at LLO) which would explain why the resonnances of the suspension are more damped there. Other than this, spectra is very close to sensor noise. The larger signal between 0.1Hz and 1Hz is highly due to ground motion (I quickly took a spectra of the streckeisen sitting next to HAM2 chamber,  which shows the same shape around 0.1Hz) More details to come next week.

MCs Phase 3b

MC1 MC2 and MC3 Phase 3b M1 to M1 transfer functions have been measured over the past weekend. They all show good agreement with model and previous measurements.

The attached files are showing comparison between model, phase 3a and 3b (except for MC2 3b vs 3b)

MC1 (allhstss_2013-05-29_Phase3b_H1MC1_ALL_TFs.pdf)

• model in blue
• phase 3a on march 2013 with ISI locked and suspension undamped in orange
• phase 3b on may 2013 with ISI damped and suspension undamped in cyan
• phase 3b on may 2013 with ISI damped and suspension damped in pink

MC2 (allhsts_2013-05-29_Phase3b_H1MC2_ALL_TFs.pdf)

• model in blue
• phase 3b on january 2013 with ISI unlocked and suspension undamped in orange
• phase 3b on may 2013 with ISI damped and suspension undamped in pink
• phase 3b on may 2013 with ISI damped and suspension damped in cyan

MC3 (allhsts_2013-05-29_Phase3b_H1MC3_ALL_TFs.pdf)

• model in blue
• phase 3a on march 2013 with ISI locked and suspension undamped in orange
• phase 3b on may 2013 with ISI damped and suspension undamped in pink
• phase 3b on may 2013 with ISI damped and suspension damped in cyan

 

files and data have been commited on the svn under the following directories :
/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/{MatlabTools/Data}
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/${MC1/MC2/MC3}/SAGM1/${Data/Results}