Displaying reports 77201-77220 of 83105.Go to page Start 3857 3858 3859 3860 3861 3862 3863 3864 3865 End
Reports until 12:45, Monday 15 April 2013
X1 SUS
james.batch@LIGO.ORG - posted 12:45, Monday 15 April 2013 (6084)
Restarted models, timing incorrect
I restarted the user model and the IOP model this morning, there was a 55 second timing error that was causing excitations to behave badly.
H1 AOS
thomas.vo@LIGO.ORG - posted 11:18, Monday 15 April 2013 (6083)
HAM 2 & 3 Optical Levers
Kiwamu I. Thomas V.

We've aligned the in-chamber optics for both HAM2 and HAM3, this is with the ISI balanced and locked (hopefully this does not change the pitch and yaw significantly after pumpdown and unlocking).  We only turned knobs on the optic mounts and did not translate anything on the ISI table so this should not have changed the #balance for @SEI.  The beams going in and coming out of the chambers look clean, I believe everything that needs to be done for these optical levers can be finished outside of the chamber.
H1 SEI
jim.warner@LIGO.ORG - posted 10:36, Monday 15 April 2013 - last comment - 15:12, Monday 15 April 2013(6082)
HAM's 2 &3 Locked, BSC2 Unlocked

HAM's 2 & 3 are locked for AOS closeout. BSC2 is unlocked, but it looks like we have a bad CPS there, so we may be locking again shortly.

Comments related to this report
jim.warner@LIGO.ORG - 15:12, Monday 15 April 2013 (6088)

BSC2 locked, then unlocked again to facilitate change out of a bad CPS. Now, it's floating, while Gerardo Sr. is in chamber with IAS for lollipop baffle alignment. HAM2 is also unlocked again for SEI checkouts, while HAM3 remains locked. Phew.

H1 SUS
arnaud.pele@LIGO.ORG - posted 09:45, Monday 15 April 2013 - last comment - 12:42, Monday 29 April 2013(6081)
BeamSplitter phase 3a (pre)testing

Beamsplitter transfer functions have been running over the weekend in order to fix any issues during the day if needed.

The attached pdfs show :

  1. Comparison between last TF damping on and model
  2. Comparison between last TF damping off and model
  3. Comparison between LHO damping on/off and LLO phase 3a (feb 2013) TFs
  4. Zoomed version of 3.

Vertical degree of freedom is noisier than expected between 1.5 and 3Hz (3rd page of each pdf).

Non-image files attached to this report
Comments related to this report
arnaud.pele@LIGO.ORG - 15:10, Monday 15 April 2013 (6087)

Gerardo went into the chamber, checked the EQ stops, and nothing is apparently touching. When the chamber will be free tomorrow during the day, I will run quick DTT measurements for the vertical degree of freedom, between 1 and 3Hz and see if it's still noisy. There were no need of taking the night for full measurements since the other DOFs are fine. I let the night to Vincent for ISI tfs if needed.

arnaud.pele@LIGO.ORG - 13:44, Monday 22 April 2013 (6158)

I ran a DTT transfer function on the vertical degree of freedom of the beamsplitter this morning

New TF looks nicer than the old one from April 12th, meaning the beamsplitter is healthy and passed Phase 3a testing

Will run a full set of TF tonight, for our record.

Data of the DTT measurement has been saved in a matlab structure named :M1VtoM1V_20130422.mat under SusSVN/sus/trunk/BSFM/H1/BS/SAGM1/Data and has been commited to the svn

Non-image files attached to this comment
arnaud.pele@LIGO.ORG - 12:42, Monday 29 April 2013 (6219)

Last measurement on the beamsplitter has been taken monday night April 22nd with damping on and off, before pumping down BSC2 chamber.

One thing to notice :

Vertical degree of freedom remains noisy around 2Hz, as on April 12th, even though dtt transfer function from aLOG 6158 doesn't show any issues. It could be that when taking TF with matlab, the drive for that frequency band is not high enough. I will try with higher gains in the MATLAB_TFs.m script and see if it changes anything. 

Non-image files attached to this comment
H1 ISC
sheila.dwyer@LIGO.ORG - posted 18:35, Sunday 14 April 2013 (6079)
ALS doubling path
Kiwamu and I went into the PSL this morning, and added two irises to the ALS doubling path (labeled ALS iris 1 and 2) to use as references for the alignment into HAM1 and out onto ISCT1.  We moved the second lens in that path about 1.25 inches closer to the periscope to get the beam better collimated leaving the table.  A mode scan of the resulting beam is attached. The spacing of the measurements is small compared to the Rayleigh range, so the fitting is not great, but we have a pretty well collimated beam with a radius of 3.3 mm coming onto ISCT1 now.  We also aligned the path up o the SHG again.  For the purposes of calculating a mode matching solution, the first steering mirror is 4+1/2" from the bottom periscope mirror, the second is 18+1/2 inches away, and we have about 13 inches after the second steering mirror in which we can place the SHG.  
Non-image files attached to this report
H1 SUS
betsy.weaver@LIGO.ORG - posted 21:56, Saturday 13 April 2013 (6077)
BSC 2 Next Vent Installation Task List

Again, the beginnings of a list - Things we need to address during the next vent opportunity (after HIFOy test):

 

Cleaning of BS optic

Set top stage BOSEMs in position to account for buoyancy (flat out forgot to do this and ran out of time)

H1 SUS
betsy.weaver@LIGO.ORG - posted 21:53, Saturday 13 April 2013 (6076)
HAM 2/3 Next Vent Installation Task List

The beginnings of a list - Things we need to address during the next vent opportunity (after HIFOy test):

 

PRM optic cleaning (if not all optics on table)

Although it "passed" the data round, investigate further some PR2 minor TF cross-coupling (SUS: see emails circa 4/11/2013 Kissel/Pele/Barton

Recenter any outstanding lower stage AOSEMs

H1 ISC
sheila.dwyer@LIGO.ORG - posted 22:14, Friday 12 April 2013 - last comment - 18:38, Sunday 14 April 2013(6073)
Beam profile on ISCT1
Kiwamu, Sheila

We removed the guillotine on the viewport and saw that the beam is nice and Gaussian.  The guillotine was also probably causing polarization problems, now that we have removed it the ghost beams off the 5% reflector and the mirror after it are much better.  
We then measured the beam profile (with PLCX-50.4-309.1 installed right after the periscope mirror, at 0.223 in the units of the plot which start from the inner edge of the enclosure walls), the data and a fit is attached.  Propagating this beam back towards the PSL gives an answer that does not make much sense, I would need to be off by 2cm in the lens position to get a reasonably collimated beam to propagate 10m back to the PSL, but I double checked my measurements and they seem to be OK.  

The conclusion is that if we want to adjust the lenses to make sure we will not have problems with clipping on the PSL periscope upper mirror (or other places) in the future, we probably need to measure the beam inside the PSL first.  
Non-image files attached to this report
Comments related to this report
john.worden@LIGO.ORG - 07:16, Saturday 13 April 2013 (6074)

Kiwamu, Sheila,

How does one view the beam profile file(.fig)? 

 

thanks

kiwamu.izumi@LIGO.ORG - 07:41, Saturday 13 April 2013 (6075)

You need Matlab to view the fig file.

sheila.dwyer@LIGO.ORG - 18:38, Sunday 14 April 2013 (6080)
here's a PDF, sorry about that.  
Non-image files attached to this comment
LHO General
patrick.thomas@LIGO.ORG - posted 21:28, Friday 12 April 2013 (6072)
plots of dust counts
Attached are plots of dust counts requested from 5 PM April 11 to 5 PM April 12.

At seemingly random intervals this morning, (and looking at the trends, last night as well) the dust monitor at end Y (location #2, labeled 'S') was reporting extraordinarily high counts for particles > .3 microns, but 0 counts for particles > .5 microns. This dust monitor had been recently returned from the dealer after being sent in for a sensor failure and calibration. I went to end Y and moved it farther from the beam tube and toward the middle of the clear space in the VEA. It had been within a couple of feet perhaps of a small pipe that was venting a high flow of air. However, after moving it, I saw the > .3 micron counts skyrocket again. I went back and got one of the HHPC 6 dust monitors to compare it to, but could not catch it happening again while I was out there. I put the HHPC 6 dust monitor near the pipe venting air, but didn't read anything nearly that high. I went back and installed a second 227b dust monitor (location #1, labeled 'C') near the electronics racks for comparison. This dust monitor was also recently returned after being sent in for repair.

The plot for end Y is for 1 day and 12 hours of full data, going back from April 12, 19:00 UTC.
T0=13-04-11-07-00-00; Length=129600 (s)
129600 seconds of data displayed
Non-image files attached to this report
H1 SEI
hugo.paris@LIGO.ORG - posted 18:26, Friday 12 April 2013 - last comment - 14:59, Sunday 14 April 2013(6071)
HAM2-ISI - TF Running

Transfer functions are running over the weekend on HAM2-ISI as well.

HAM2 was unlocked. It was a bit difficult the get the tight covers to stay away from the ISI without the rods we usually have (used on HAM3, see attached pictures). I added a couple clamps to keep the sheet in place over the weekend.

Images attached to this report
Comments related to this report
hugo.paris@LIGO.ORG - 14:59, Sunday 14 April 2013 (6078)

It looks like the covers rubbed against the ISI afterall. We need to take the cover rods from HAM3 chamber, put them on HAM2 and take a new set of measurements.

H1 AOS
gerardo.moreno@LIGO.ORG - posted 18:11, Friday 12 April 2013 (6069)
BS Optical Lever Periscope Installation
Installed the periscope inside chamber, but it does not look right, there is no clear line of sight, the BS elliptical baffle is on the way.
We are going to continue to work on it next week.
Images attached to this report
H1 SEI
hugo.paris@LIGO.ORG - posted 17:52, Friday 12 April 2013 (6068)
HAM3-ISI - TF Running

Transfer Functions are running over the weekend on HAM3-ISI. 

The HAM-ISI master models were recently updated. We took a quick set of transfer functions (1 average) to make sure everything was OK.  Time series for the CPS signals are attached.

Images attached to this report
H1 ISC
sheila.dwyer@LIGO.ORG - posted 17:00, Friday 12 April 2013 (6067)
SHG TEC on ISCT1 working
The temperature controller for the SHG on ISCT1 is now working.  

I had made a mistake in copying over the system manager from the test set up to the corner, which would be easy to repeat.  There are two inputs from the resistance measurement terminal, EL3692, there is SAI Inputs Channel 1 which has the status bits and something called value, which looks like the resistor value if you look at it in the online tab, but doesn't actually work, the one to use is under SAI Inputs Real Channel 1.  

H1 SUS
mark.barton@LIGO.ORG - posted 16:58, Friday 12 April 2013 - last comment - 12:40, Wednesday 08 May 2013(6066)
New TMTS model
Szymon and Mark B.

We extensively revised the TMTS model using first article data from Ken Mailand. The preferred model is now at

^/trunk/Common/MatlabTools/DoubleModel_Production/tmtsfa.m

In conjunction with the DTT data plotting script

^/trunk/TMTS/Common/MatlabTools/plotTMTS_dtttfs.m

it gives a respectable fit to measured data:

^/trunk/TMTS/H1/TMSY/SAGM1/Results/2013-03-14_1936_H1SUSTMSY_M1.mat
^/trunk/TMTS/H1/TMSY/SAGM1/Results/2013-03-14_1936_H1SUSTMSY_M1_ALL_TFs.pdf

The biggest mismatch is that an R (Mathematica/Matlab pitch) mode predicted for 0.6 Hz is observed at more like 0.7 Hz. Everything else is pretty much bang on.
Non-image files attached to this report
Comments related to this report
mark.barton@LIGO.ORG - 12:40, Wednesday 08 May 2013 (6293)
Per request of Jeff K, the parameter file tmtsfa.m (r4480) was later renamed tmtsopt_firstarticle.m (r4526). 
H1 SUS
betsy.weaver@LIGO.ORG - posted 16:53, Friday 12 April 2013 - last comment - 16:54, Friday 12 April 2013(6064)
HAM 2, 3, BSC 2 SUS closeout

So, the afternoon BS FC application/removal indeed picked up the hazy 3" circle at the 3 o'clock position and the FC remnants at the center of the optic.  However, there are now little "splatter dots" across the ~entire surface, 1-3 every inch.  Some are a little circle like feature, as if we "sprayed something wet on it" and it dried in small dots - ha.  So, I'm certain these are from the FC spray drying faster than I could spray - even when I was anticipating this and sprayed fast to try to avoid this.  Possibly a subsequent FC cleaning could remove these, but I'm out of time to keep performing this few hour long task again and again.  Will confer with CIT regarding cleaning in 2 months.

Arnaud and Travis finished reassembling the BS EQ stops and ellipt baffle and took B & K measurements, so we are done there.

Note, we have officially walked away from HAM 2/3, turning them over to SEI who are now TF'ing.  Which brings me to the PRM - the FC cleaning of this guy was a failure as there is major smearing/contaminant on the HR surface (see pic 3 attached).  Of course, this is the one I did completely by myself without the Margot/Kate help, so apparently I did something wrong although not sure what since I was following their procedure and working with them.  Michael reminds me that we do not used PRM in HIFOy so we will revisit cleaning on PRM again in 2 months.  The MC1 - 3 FC cleaning this week removed some particulate although all 3 mirrors have a few particles within the central 1" area - particulate that I could not blow off with deion' N2.


Phew - SUS is finally done in HAM2, 3, and BSC2 - for NOW.

Images attached to this report
Comments related to this report
betsy.weaver@LIGO.ORG - 16:54, Friday 12 April 2013 (6065)

PRM pic.

Images attached to this comment
H1 SUS
arnaud.pele@LIGO.ORG - posted 20:23, Thursday 11 April 2013 - last comment - 18:18, Friday 12 April 2013(6049)
MC1 MC2 MC3 PRM PR3 Phase 3a transfer functions

Starting several rounds of transfer functions overnight for phase 3a testing prior closing HAM2 HAM3 chamber.
Measurements will run until tomorrow afternoon, and will be paused if needed to go in chamber.

Comments related to this report
arnaud.pele@LIGO.ORG - 18:18, Friday 12 April 2013 (6070)

all suspensions passed phase 3a testing prior to ham2/ham3 close up. plots will be updated on monday

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