Displaying reports 72881-72900 of 82999.Go to page Start 3641 3642 3643 3644 3645 3646 3647 3648 3649 End
Reports until 16:01, Friday 28 February 2014
H1 SUS
arnaud.pele@LIGO.ORG - posted 16:01, Friday 28 February 2014 - last comment - 13:11, Monday 03 March 2014(10426)
ITMY Oplev

Before starting measuring Pitch to Pitch on ITMY, I realized the oplev signal was oscillating at high frequencies. I took a spectra and compared with other oplevs, and the noise floor from 1000Hz is ~2 orders of magnitude higher compared to ITMX. Thomas pointed out that this oplev doesn't have an analog whitening filter yet, so we should double check when it will be installed.
dtt template was saved under SusSVN/sus/trunk/QUAD/H1/ITMY/SAGL2/Data/2014-02-28_Oplev_Spectra.xml

Images attached to this report
Comments related to this report
arnaud.pele@LIGO.ORG - 13:11, Monday 03 March 2014 (10461)

What I meant by "oscillating at higher frequencies" is that the noise is higher for ITMY than ETMX as we can see on the time plots (ETMX in green, ITMY in red)

Images attached to this comment
H1 AOS
yuta.michimura@LIGO.ORG - posted 15:39, Friday 28 February 2014 (10422)
Michelson noise budget from the NB tool

Evan, Yuta

We redid the Michelson noise budget using the NB simulink tool.
The data we used was taken from the long strech MICH lock on Feb 17 (see alog #10127).
The noise budget agrees well with we have done by hand (see alog #10221, #10217).
NB model works pretty nicely.

[Result]
NB_MICH_1076736130.png: Michelson noise budget plot. "Measured" curve shows the sensitivity curve calibrated from H1:LSC-MICH_OUT. Seismic noise is copied from LLO measurement, so seismic noise curve is not real.

sensorNB_MICH_1076736130.png: Noise budget for sensor noises. Low frequency noise mainly comes from the demodulator board noise. Compared with the one we did by hand (alog #10221), there is a factor of 5 difference in ADC noise. This is because we forget to put the PD filter bank gain (H1:LSC-REFLAIR_A_RF45_(I|Q)_GAIN) in the previous one.

[Note on NbNoiseSink]
If you put NbNoiseSink block into your model, noise at the sink will be calibrated by taking out the model loop gain. If you specify a DAQ channel to that sink and if you run 'nbAcquireData' function, it gets the actual data from a NDS server (using Matlab "get_data" function). So, NB tool automatically calculates the sensitivity curve for given GPS time.

Also, note that LiveParts and data fetching fail if you specify GPS time more than ~7 days ago. I'm not sure why, but it is a limitation from "get_data" function.

Images attached to this report
H1 DAQ (CDS)
james.batch@LIGO.ORG - posted 15:38, Friday 28 February 2014 (10424)
Framewriter reboots
H1fw1 and the LDAS gateway were rebooted at 14:42 PST to correct problems with keeping the frame writer process running.  On examination of the LDAS gateway for frame writer 0, it was determined that significant problems existed that required a reboot of that as well.  This interrupted the h1nds0 NDS server and the h1dmt data stream.  
H1 SUS
kiwamu.izumi@LIGO.ORG - posted 15:37, Friday 28 February 2014 - last comment - 15:43, Friday 28 February 2014(10423)
control signs were wrong in BS oplev loops

Stefan, Kiwamu,crying

We could not close the oplev damping loops today. It turned out that the oplev servo gains had been wrong since the model reboot on the last Tuesday. In fact, the signs were wrong in safe.snap file. We updated the safe file. Now they are 0.03 and -0.03 for pitch and yaw loops respectively.

Comments related to this report
kiwamu.izumi@LIGO.ORG - 15:43, Friday 28 February 2014 (10425)

The attached is the open loop transfer function with the WRONG sign (i.e. OLDAMP_P_GAIN = -0.03 ) in pitch

Images attached to this comment
H1 ISC
corey.gray@LIGO.ORG - posted 15:30, Friday 28 February 2014 (10420)
EY TMS Extra Tooling Removed & Safety Stop Installed

After the BSC-ISI passed a coarse alignment check, went out to work on Post-Cartridge tasks for the TMS.  Basically we want to remove excess mass from the TMS & get it ready for fine balancing of the ISI.

Restraint Tooling/Table Cover Removed & TMS Upper Mass Released

Went ahead and removed the TMS Restraint Tooling (turnbuckles, chains, & eyebolts).  Then I went upstairs and released the Upper Mass.  I then removed the Metal Table Cover.  Some thing I missed were some questionable eyebolts attached to the Upper Structure.  We we want to know whether these eyebolts (most likely) & an aluminum part (not sure) stay on the structure or get pulled off.  Will probably have to address this on Monday BEFORE fine ISI balancing.

Safety Stop Structure (Disassembled & Assembled) & Installed

I then went about installing the Safety Stop Structure (D1001781) to the BSC10.  First thing I noticed was this assembly was built for H2! (see photo #1)  So I had to take the assembly apart and then rebuild it for H1.  I then attached it to the ribbing of the BSC chamber.  After some manhandling, I was able to get this structure up and needled through the eyebolts on the TMS Table.  Other than the possible parts above, the TMS is pretty much ready for ISI balancing.

Note:  will keep the TMS Upper Structure "free" (vs. locked).

Images attached to this report
H1 SUS
betsy.weaver@LIGO.ORG - posted 15:15, Friday 28 February 2014 (10419)
ETMy status

After the coarse IAS checks were finished this morning, Travis and I fully unlocked the ETMy QUAD which repositioned all of the masses into their pre-aligned posistions.  This also removed alot of extra locking bracket payload.  We then pulled all of the shield and optic cap payload and added the witness plate mount such that the total payload of the QUAD was within ~a lbs of being correct.  We then reclamped some of the masses lightly such that SEI can load masses around upstairs on top of the ISI in order to continue their work.

H1 SEI
arnaud.pele@LIGO.ORG - posted 14:45, Friday 28 February 2014 (10418)
ITMX trip plots @ gps 1077661220
Images attached to this report
H1 AOS
thomas.vo@LIGO.ORG - posted 13:24, Friday 28 February 2014 (10417)
Instrument air alarm at 10:45 AM PT
Kyle investigated.
H1 CDS
david.barker@LIGO.ORG - posted 12:36, Friday 28 February 2014 (10413)
/ligo file system stopped NFS exporting

Cyrus and Dave

around noon the /ligo file system became unavailable, causing the workstations to freeze up. We rebooted cdsfs0 and restored the file system. We are in the process of restarting the workstations to give them a clean NFS mount.

H1 General
stefan.ballmer@LIGO.ORG - posted 12:08, Friday 28 February 2014 - last comment - 13:22, Friday 28 February 2014(10412)
sad


			
			
Images attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 13:22, Friday 28 February 2014 (10416)CDS, SYS
Seconded.
H1 AOS (AOS, SEI, SUS)
douglas.cook@LIGO.ORG - posted 11:48, Friday 28 February 2014 - last comment - 12:55, Friday 28 February 2014(10410)
IAS check of "coarse" position of the ETMy looks good
(Doug, Jason, Hugh, Betsy and CO)
First look at the ETMy in chamber measurements are very encouraging. 
Results:
Longitudinal was short by 0.5mm from absolute, tolerance is +/- 3.0mm,
Lateral position is 0.35mm to the south, +/- 1.00mm
Elevation position is high by 0.35mm, tolerance is +/- 1.0mm

Optic is set lightly on EQ stops, but for a first look to identify any need to move the ISI or SUS this is very reasonable results.

The arm cavity baffle was rough positioned to accommodate the line of sight from the spool and currently rests unattached on its installation table so use caution when working around it.

When fully pay loaded, cabled with the ETM suspended we will do the the fine alignments of the positions and optic angles
Comments related to this report
douglas.cook@LIGO.ORG - 12:04, Friday 28 February 2014 (10411)
Forgot to mention that the particle counts were 3-4 counts on the .3 microns scale and 1-2 counts on the .5micron scale at the spool while we occupied that area.

Kudos to the folks that keep the VEA clean and well stocked with garb and cleanroom supplies.
jason.oberling@LIGO.ORG - 12:55, Friday 28 February 2014 (10414)

The vertical position is actually high by 0.9 mm, not by the 0.35 mm originally stated.

LHO VE
kyle.ryan@LIGO.ORG - posted 11:25, Friday 28 February 2014 (10409)
PT499 instrument air alarm -> people working in vacinity accidently closed valve to transducer -> opened valve -> OK


			
			
H1 SEI
jeffrey.kissel@LIGO.ORG - posted 11:02, Friday 28 February 2014 (10408)
The Three new Sets of ST1 Blend Filters for BSC-ISIs
J. Kissel, for F. Matichard,

As mentioned in LHO aLOG 10397, Fabrice has installed a clean set of three blend filters on ETMX, ITMX, and BS. (I loaded ITMX filters this morning). Here're plots of the new blend filters for ST1 BSC-ISIs. 
"TCrappy" is exactly the same -- a version virtually identical to Ryan DeRosa's very-low-blend filters, 
"Start" are an improved "750mHz" that *actually* rolls off at high-frequency and does not include the T240s. 
"TStart" has the same displacement sensor / inertial sensor 750mHz crossover, but includes the T240s to get rid of L4C noise at low frequency.

The plan is to use "TCrappy" when possible, and "TStart" under high wind conditions.

7:00 pm PT EDIT:
I've now added the filters for both stages in all degrees of freedom for a BSC-ISI. I've done this using a newly committed version of
/ligo/svncommon/SeiSVN/seismic/Common/MatlabTools/plot_current_blends.m
Use it. All the time. When ever you install a new set of blends.
Non-image files attached to this report
H1 AOS
douglas.cook@LIGO.ORG - posted 16:11, Thursday 27 February 2014 - last comment - 10:54, Friday 28 February 2014(10393)
IAS euipment ready for the first look at ETMy
Jason and I are ready for the lateral and longitudinal ETMy position measurements in the AM. We won't know whether we will need to tweak the ACB position for any line of sight issues until the first look. Thanks Betsy and Travis for setting the ACB for us (temporary setup). We will not release the optic suspension for the fine positioning until we are satisfied that no large moves are needed.
Comments related to this report
travis.sadecki@LIGO.ORG - 08:52, Friday 28 February 2014 (10404)

Credit where credit is due: Mitch and Jim "installed" the ACB.  Betsy and I just uncovered the SUS and mounted the corner cube.

betsy.weaver@LIGO.ORG - 10:54, Friday 28 February 2014 (10407)

For posterity - the ACB is sitting on the ACB "table" in the tube section between the chamber and the spool.  This is to enable the IAS sighting of the ETMy optic without the ACB blocking the view while it is parked in the tube before install.  We chose not to install the ACB on Stage 0 because it blocks access to the 3rd blocked side of the QUAD making alignment and sensor tuning extremely difficult.  The ACB will be installed on Stage 0 after a few rounds of this is complete.

H1 TCS (TCS)
thomas.vo@LIGO.ORG - posted 14:14, Thursday 27 February 2014 - last comment - 13:08, Friday 28 February 2014(10378)
ITMY Ring Heater
The readback channels for the corner station ring heaters seem to not have been working properly since last Friday.  I've attached a graph that shows that the ring heaters seem to have turned off at 02-21-2014 22:5:32 UTC.  Judging from the ALOG around that time, there were a lot of reboots going on in software, I'm not sure about hardware reboots.  However, Kiwamu says that the PRC power level is looking like the ring heaters are on just based off of the amount of loss he measured.  He also advised that since the system is working well, I should hold off on trying to power cycle the TCS chassis until a later time but at the first chance I get, we should try to resolve this issue.

The ITMX ring heater is also displaying similar weirdness, which is expected since they share the same chassis and PLC.
Images attached to this report
Comments related to this report
thomas.vo@LIGO.ORG - 13:08, Friday 28 February 2014 (10415)
Kiwamu, Sheila, Thomas

This morning seemed to be a good time to investigate this issue.  At first we saw that the PLC3.pro was connected to EPICS but not to the System Manager, i.e. the ADC channels were not getting from the hardware to the TwinCAT software.  We tried re-running the install scripts but it did not fix the problem but it did help us figure out that there were some channels deleted recently.  Daniel let us know that if there are some additions or deletions, we should re-map the configuration before recompiling.  This solved the problem!
H1 SUS
betsy.weaver@LIGO.ORG - posted 09:25, Tuesday 25 February 2014 - last comment - 15:30, Friday 28 February 2014(10305)
PUM ITM03 ear bonding commences

We thought it prudent to have a spare PUM in-hand for the upcoming monolithic builds, so yesterday we started bonding ears to the PUM ITM03.  Gerardo sucessfully placed an ear on the S4 surface with an error of under 0.01mm misplacement (0.1mm is the tolerance, so well done Gerardo!).  On to the S3 ear...

Comments related to this report
betsy.weaver@LIGO.ORG - 12:44, Tuesday 25 February 2014 (10312)

Like NBC jinxed all of the ice skaters by praising them just before they fell at the latest Olympics, I spoke too soon about the PUM ITM03 ear.  Just after writing the above alog, Gerardo and I inspected the S4 ear and discovered a large bubble near the corner of the ear.  It had a small fiberous particulate in the bubble.  SOmehow, after monitoring for 2-3 hours, this fiber migrated into the bond.  We had placed a LIGo-approved Vectra Alpha 10 cleanroom wipe over the S4+ear flat for the night in the event a random bug decided to perch, so possibly this added to the particulate.  Da*m.

 

With Mr. Barton's assistance, we loaded the mass into the ultrasonic cleaner and bathed it in water.  Within 4 minutes the ear came off.  The mass is now reloaded at the wash station and we'll work on the S3 ear we were already prepped for today.

Images attached to this comment
betsy.weaver@LIGO.ORG - 13:20, Tuesday 25 February 2014 (10315)

Bubble is shown in far corner of ear in this picture.

Images attached to this comment
betsy.weaver@LIGO.ORG - 15:30, Friday 28 February 2014 (10421)

Further comment to the events above - Margot and Gerardo found this PUM to be dirtier than normal when they pulled it out of the cake tin many weeks ago.  AT that time, they did a methanol cleaning of the entire mass.  When Gerardo and I were cleaning the flats of this mass, we also noticed that it still seemed dirtier than "normal" - meaning, when rinsing, the water did not run on the surface as we had seen on other flats.  After we performed the standard cleaning of the flat, the water behaved "normally", meaning it clung to the full surface and "sheeted" off.  After we removed the contaminated ear, we recleaned the flat, expanding the surface area getting cleaned to the entire flat, not just the area when the ear gets bonded as is the typical procedure.  We hoped this would remove particulate that was previously closer to the bond area.  During the second ear bond attempt, we also did not cover the bond overnight with an alpha 10 wipe, since we were skeptical of the origin of the fiber which showed up in the bond.

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