thomas.shaffer@LIGO.ORG - posted 13:48, Tuesday 16 June 2015 (19173)
EY back to Laser SAFE
= Mid-day Summary =
7:45 Christina and Karen to EX and EY to check garb in clean rooms.
8:35 Corey, Keita, Kiwamu to EX (TMS work)
8:28 Jason and Peter to PSL
8:41 Richard with the electrician in LVEA
8:44 Karen and Christina leaving EX, heading to EY.
Andreas and Jeff B to EY to get supplies, then
8:59 Fil to EX - CHeck tools for ESD retrofit
9:02 Richard back
Hugh to Ebay - reset B seis STS2.
9:17 Hugh back
9:30 HAM6 clean room fan on
9:54 Let the water system guy in
10:02 Sheila restarting OAF model
10:10 Karen and Christina out of EY
10:18 Gerardo to EY
10:22 Greg to LVEA (store parts)
10:26 Betsy at EY, with whole bunch of other people. Expect EY tripped. Don't do anything, Betsy will take care of it.
10:35 Jeff B and Andreas back
11:00 Andreas to HAM2 (drop off stuff)
Karen vacuums mechanical room
11:40 Gerardo back from EY
11:59 Corey et al. out of EX
EX now laser safe
12:00 TJ takes over. Go team!
Corey, Keita, Kiwamu,
We conituned working on the remaining tasks for the TMSX in chamber (see alog 19157 from yesterday).
This morning we installed the strain reliefs for the two QPDs in which we had a difficulty inserting a screw due to bad threading. Today, we brought 10-32 screws so that the screw can go all the way through to the back without any interference from the bad threads. We put combination of a nut and washer on the other side to hold the 10-32 screw and the strain relief parts. We did this on the two QPDs. So now all four QPDs have the strain reflef parts installed.
We then balanced the table such that the green light is retro-reflected off of ETMY. The table seemed to have pitched by some amount. We decided to move the counter mass at the bottom of the table. The adjustement went very smooth and we were able to get the beam retrao-reflected all the way back to the PD on the ISCTEX table. Touching the TMS digital bias suggested that the pitch angle is good with a precision of about 4 urad. While pitch is good, yaw seemed to be slightly off. So we moved the digital bias in yaw as well and confirmed that adding an additional +40 urad (resulting in a bias of ) in the digital bias can give us a decent alignment on the reflection PD. So we are good in yaw too.
After initial balancing we were concerned that we did not use vented washers for the two QPDs which required the screw/nut workaround. Keita found that one QPD did NOT have a vented washer, so a vented washer was installed. This required a re-balance. We were a little off in pitch, so a counterweight (1/4-20 screw) was added to pitch the TMS.
Photos of this work from Mon afternoon & Tues morning is on ResourceSpace here.
(And ready for the SUS crew to take over.)
Green QPDs were confirmed to work using green beam on the day we entered the chamber.
Today (June 17), with a help from Gary, IR QPDs were confirmed to work using LED flash light.
J. Kissel, A. Pele,
Over the next few days, we intend to make changes to the QUAD models and the BSC-ISI models. These changes are covered in the following ECRs:
SEI: (Work Permit: 5284)
- Official integration of MICH Freeze infrastructure for the BSC ISI's library part.
ECR: E1500253,
Int. Issue: 1063
- Move / rename the GND STS BLRMS channels out of ST1 BSCs and up to the top-level ISI-GND block
ECR: E1500245,
Int. Issue: 1059.
- Adding Tidal correction inputs to the BSC-ISI:
ECR: E1500270,
Int. Issue: 1067
SUS: (Work Permit: 5285
- Accomodate both observatories' versions of tidal control feedback to the QUADs:
ECR: E1500228,
II: 1055
- Reconcile LLO's QUAD top mass bounce and roll mode damping to use DARM_CTRL and any AS WFSs instead of DARM_ERR.
ECR: E1500090,
II: 953
- Modifications to the QUAD model for violin mode damping:
ECR: E1500271,
Int. Issue: 1067
And the following non-version controlled software will also be changed:
- Update the corner-station LSC model to accomodate the above MICH freeze infrastructure
(an update to the ${userapps}/lsc/common/models/lsc.mdl, and plus new connections to IPC at the top level).
Work Permit: 5284
- Update the OAF model to modify QUAD bounce and roll mode damping monitors
(an update to ${userapps}/isc/h1/models/h1oaf.mdl)
Work Permit: 5278
- Update to top-level CAL-CS model to add the blind injection channels to the frames.
(an update to ${userapps}/cal/h1/models/h1calcs.mdl)
Work Permit: 5286
- Update to the ASC model to allow for flexible choice of error signal for bounce and roll mode damping,
i.e. adding the WFS AS_A and AS_B YAW DOFs as possible choices
(an update to ${userapps}/asc/common/models/ASC_MASTER.mdl)
Work Permit: 5278
The list below is for the time between now and O1. Since the sensitivity has reached the nominal goal set for O1, we plan to prioritize reliability and operations issues to maximize the up-time.
Under Reliability & Operations, I would also add:
11) Help to Train Operators
Kyle, Gerardo Vented X-end (DP < -45 C)-> Vented Y-end (DP < -35 C) -> Installed NEG assembly on BSC6 -> Installed TMDS reducing nipple+valve+elbow on BSC10 Kyle, Gerardo, Bubba Removed BSC9 West door at X-end -> Removed BSC10 North door at Y-end Bubba Connected TMDS 100 psi line to purge-air skid
(Keita, Kiwamu, Corey)
After the Vacuum crew removed the door, and Jim Warner locked up the ISI (& removed the Contamination Control plates), we started TMS work. Summaries of the TMS activities are below:
1) Green Clipping
The ETMx Bias were:
In order to center the beam on the ISCT-EX REFL_PD, the ETMx was steered to the following biases:
After this Keita entered the chamber and looked for clipping. He started with the first steering mirror on the TMS, the one that showed very bright scattering back in Feb., and no clipping was observed this time though the beam was somewhat low, and there was some ghost beam hitting the top right edge.
Keita checked downstream optics and no clipping was observed either. No changes were made to the TMS optics alignment.
2) Strain Relief of QPDs
Ran into a problem with attaching the Strain Relief Parts (D1101911 & D1002110) to the QPDs. The problem was attaching the Strain Relief Clamp (D1101911) to the main QPD Housing. Unfortunately, the 1/4-20 hole in the housing had bad threads for two of the four QPDs. It's a thru-hole and screw could only go in a thread or two. My guess is the machinist tapped the holes from the backside with a tapered tap & didn't tap all the way through. So some of the threads at the entrance of the hole aren't cut completely.
Keita & Kiwamu went ahead and installed the Strain Relief Assy on the two QPDs which were fine.
As for the remaining two, we might use thinner 10-32 or 10-24 screws, long enough to go through the QPD base and the strain relief combined, and use a nut and two washers if such things are found. Otherwise we'll leave them without strain relief, as there's more than 1/4" of space between the cable collar and the metal part of the QPD support structure.
3) Krytox Beam Diverter
Corey went into the chamber, loosened the screw that attaches the shaft collar to the axle, slid the axle and the jewel bearing out on one side, applied Krytox, did the same to the other side, rebalanced the diverter by attaching 5 1/4" and one #8 vented washers as a counter mass, and assembled everything together.
This was done all in situ. Tested opening/closing via MEDM several times and it worked fine.
Jeff and Greg found the necessary screws, washers and nuts, so we'll do the rest of QPD strain reliefs the first thing in the morning, then rebalance TMS. We'll be done by noon-ish.
EX station is left in laser hazard.
I modified ASC_MASTER today to give us the option of using AS 45 Q Yaw signals to damp roll, because yesterday we saw that this was needed for ETMX. The model is committed, and I added an medm screen that is linked from the ASC overview and the small bounce roll monitor screen for the matrix. The ASC model changes were done today because Adam at LLO will also work on this library part tomorow durring maintence.
I also added log scale monitors to the oaf model, but made two typos in doing this. I've fixed the mistakes and recompiled the model, we will wait to do a make install until the normal maintence time tomorow.
Modified installed Matlab 2010a system libraries to point to Ubuntu12 system libraries to allow awgstream to run. This is an unusual request, as the control room is set up to run Matlab 2012b by default, but one user had a script which runs with Matlab2010a (but not 2012b).
All times in UTC
15:00 It Seems the NPRO trippedhttps://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=19141. GRB alert/alarm is sounding so I'm getting my first look at where thing are regarding this. LASER is back up and Peter i working on getting it back into nominal operating condition. End Station LASER status is BUILDING SAFE for vent work. This means all viewports are secured, ISC tables are locked and safety signs have been transitioned.
15:31 Cleaning crew done second cleaning at EX and goin to EY
15:44 Peter to Transistion the LVEA to LASER SAFE
15:46 Turned of both CO2 LASERS.
15:57 Gary ad Danny to EX
16:00 LVEA transitioned to LASER SAFE.
16:02 Picomotors disabled at EX, EY and HAM6
16:09 Bartlett to cleaning area.
16:25 Bartlett came out and went back in to prepare HAM6 area for Vent
16:26 Cleaning crew done with second cleaning at EX.
16:33 ISS is stable now and the REFSIGNAL is set to -2.12 for 6.5% AOM diff power
16:36 GV20 (EX) closed. (not sure what time). Gary and Danny to EY to meet Kyle. GV18 Not closed yet.
16:57 Closed Green Beam ISC table shutters
17:15 Arnaud testing a script to test MC1 suspensinon actuators
17:22 Danny and Travis at EX
18:00 Betsy, Travis, Danny and Gary to EY
18:06 Bartlett to EY
18:10 Karen and Christina into LVEA for cleaning
18:14 J Worden and co. dropping a ditch digger of at the turnaround next to VPW.
18:21 Jeff leaving EY
18:24 Ditch machine dropped off and Truck is moving to MX to pick up a scissor lift
18:28 Gary and Danny back from EY
18:46 Betsy and Travis back from EY
18:48 Hugh back from EX
18:57 GV18(EY) closed
19:12 Corey into LVEA
19:15 Betsy into the LVEA w Bay
19:30 Betsy out nd going to EX
19:38 Sheila informed me of a not so distant DAQ restart.
20:00 Danny and Travis to EY
20:16 Jim is at EX and garbing. He will lock the ISI in about 20-30 min.
20:44 Keita, Kiwamu and Corey to EX to start TMS investigation.
21:03 DAQ restart
21:15 Kate and Calum on site. They will be here for a couple of weeks.
22:18 Hugh into the LVEA to install 2 STS2 seismometers in the BG
22:32 Hugh out of the LVEA
22:42 Betsy out to HAM6 to have a look
Generated Xilinx iMPACT configuration archives (.iaf) for most recent timing firmware and uploaded them to the DCC pages corresponding to their respective device firmware: 1PPS Locking Firmware: https://dcc.ligo.org/LIGO-E1200033 Comparator Firmware: https://dcc.ligo.org/LIGO-E1200034 IRIG-B Firmware: https://dcc.ligo.org/LIGO-E1200035 DuoTone Firmware: https://dcc.ligo.org/LIGO-E1200036 The links for these .iaf files on the FPGA code page of the Timing Wiki (https://awiki.ligo-wa.caltech.edu/aLIGO/TimingFpgaCode) are now functioning.
To correct problems with the Simulink web view of models (accessible from https://lhocds.ligo-wa.caltech.edu/simulink/) several models have been changed to be saved at the top level of the model. If this isn't done, the top level of the model is not generated for the web view. The models which were changed are: h1iscex h1iscey h1isietmx h1pemcs h1pemex h1pemey h1pemmx h1pemmy h1susauxb123 h1susauxh34 h1susetmx h1susim There are still a few models that need to be changed.
This appears to be correctable without modifying model files by adding parameters to the slwebview() call in the matlab script. I'll make the change in time for the 18:00 hour model web view to see if it works.
Attached is a noise budget for the DARM spectrum from 2015-06-07 00:00:00Z–02:00:00Z. Notes:
Conclusions:
Attached are the MICH and SRCL coupling TFs into OMC-DCPD_SUM.
Restarted the data concentrator because of changes to the h1asc and h1oaf models.
It seems that the pitch control signal sent to SR2 (from the AS_C sensor) is correcting mostly for motion of SR3, especially in the first hour after powering up. We should think about changing this feedback from SR2 to SR3 after the engineering run.
Some more information:
As the interferometer gets warmed up, SR3 pitches by 0.7 urad upward while SR2 pitches down by 10 urad via the SRC alignment loop. On the other hand, it is hard to tell how SRM reacts to the heated interferomter. See the attached trend which has the same time period as that Sheila posted.
