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  40m Log, Page 311 of 335  Not logged in ELOG logo
ID Date Author Type Categoryup Subject
  14096   Sat Jul 21 14:03:19 2018 KojiSummaryThermal CompensationY arm locking

Ah. With MC2 feedback, we have about 3 times smaller "optical gain" for the ASS A2L. We have same dither, same actuator, but we need only 1/3 actuation of the MC2 compared to the ETMY case.
We had to reduce the ASS spot servo from 1 to 0.3 to make is stable, so this means that the ASS is really merginally stable.

  14103   Wed Jul 25 14:45:59 2018 SandrineSummaryThermal CompensationETM Y Table AUX read out

Attached is a photo of the set up of the ETM Y table showing the AUX read out set up. 

Currently, the flip mount sends the AUX to the PDA255. Terra inserted a razor blade so the PDA255 will witness more HOMs. The laser is also sent to the regular PD and the CCD.

Attachment 1: EY_table_.JPG
EY_table_.JPG
  14105   Thu Jul 26 01:52:01 2018 terraUpdateThermal Compensationheater work update

Just a quick update: over the past few days we've taken (at least) 5 scans around each peak [carrier - HOM3] at 9.4V/0.8A, 4 scans around [carrier - HOM5] at 12V/0.9A hot state with the reflector setup. We also have (at least) 5 scans of carrier - HOM5 in cold state. I attach a rough overview of the peak magnitude shifts in the first attachment. Analysis ongoing. All data stored in annalisa/postVent/{date}

Initial shifts just based on rought peak placement in the meantime:

            [9.4V/0.8A]   [12V/0.9A]

HOM1    10 kHz         20 kHz

HOM2    18 kHz         28 kHz

HOM3     30 kHz        40 kHz

HOM4     N/A             26 kHz

HOM5     N/A             35 kHz

I also attach the heating thermal transient from today (12V/0.9A) as seen by the opLevs. We see a shorter time constant for pitch, longer for yaw, preceeded by a dip in yaw. Similar behavior yesterday for slightly less heating, though less pronounced pre-dip. The heater is offcentered on the optic horizontally; likely this is part of the induced yaw. The spikey stuff i removed is from people walking around inside during the transient.

I've left the heater and LSC off for the night. Heater off at 2:07 am local time.

Please don't touch the oplevs; we're taking a cool down measurement.

Attachment 1: OpLev_thermal_drift.pdf
OpLev_thermal_drift.pdf
Attachment 2: hotColdAll.pdf
hotColdAll.pdf
  14109   Fri Jul 27 17:16:14 2018 SandrineUpdateThermal CompensationCopied working scripts for mode spectroscopy into new directory (modeSpec)

The scripts: AGfast.py, make HDF5.py, plotSpec_marconi.py, and SandrineFitv3.py were copied into the new directory modeSpec.

The path is: /opt/rtcds/caltech/c1/scripts/modeSpec

These scripts can still be found under Annalisa's directory under postVent.

  14110   Sat Jul 28 00:45:11 2018 terra, sandrineSummaryThermal CompensationHeater measurements overview

[Sandrine, Koji, Terra]

Summary: We completed multiple scans at different heating powers for the reflector set up, observing unique HOM peak shifts of tens of kHz. We also observed HOM5 shifts with the cylinder set up. Initial Lorentzian fittings of the magnitude give tens of Hz resolution. I summarize the main week's work below. 

Set-up

Heater set-up is described in several previous elogs, but attachments #1 and #2 show the full heater set-up and wiring/pinouts in and out of vacuum, since we're all intimately aware of how confusing in-vacuum pinouts can be. We are not using the Sorenson power supply (as described in 14071); we just have the BKPrecision power supply 1735 sitting next to the ETMY rack and are manually going out to turn on/off. 

We've continued to use the scan setup described in elog 14086, which is run using /users/annalisa/postVent/AGfast.py. Step by step notes for setting up the scan, running the scans, and processing the scans are attached in notes.txt.

Inducing/witnessing HOMs

The aux input beam was already clipped and on wednesday (after Trans was centered, 14093) we also clipped the output aux beam with razor blade (angled vertically and horizontally, elog 14103) before PDA255; we clipped ~1/3 of the output beam. Attachment #3 shows before and after clipping output, where orange 'cold' == unclipped, black 'mean' == clipped (all in cold state). Up to HOM5 is visible. 

Measurements

Below is a summary of the available scan data. We also have cold (0A) scans CAR-HOM5 and full FSR scans for most configurations. 

Elliptic Reflector
current[A] voltage[V] power[W] scans
0.4 2 0.8 CAR-HOM3(x1)
0.5 3.4 1.7 CAR-HOM3(x1)
0.6 5 3.0 CAR-HOM3(x1)
0.8 9.4(9.7) 7.5(7.8) CAR-HOM5(>x5)
0.9 12 10.8 CAR-HOM5(x4)
1.09 17 18.5 CAR-HOM3

 

 

 

 

 

 

 

Cylinder + Lenses
current[A] voltage[V] power[W] scans
0.9 15 13.5 CAR-HOM5(odds x4)

We tried the cylinder set-up again tonight for the first time since inital try and can see shifts of HOM5 - see attachment #5; we haven't looked in detail yet, but it looks like odd modes are more effected, suggesting the ring heat pattern is off centered from the beam axis. 

Scan data is saved in the following format: users/annalisa/postVent/scandata/{reflector,cylinder}/{parsed,unparsed}/{CAR,HOM1,HOM2,HOM3,HOM4,HOM5}{_datetime}{_parsed,_unparsed}.{txt,pdf}

Minimum heating

On 7/26 we increased the power to the elliptical reflector heater in steps to find the minimum heater power required to see frequency shifts with our measurement setup. Lowest we can resolve is a shift in HOM3 with 1.7W (0.5A/3.4V). According to Annalisa's measurements in elog 14050, this would be something like 30-60 mW radiated power hitting the test mass. We only looked at CAR - HOM3 for this investigation; data for scans at 0.4A, 0.5A, 0.6A is available as indicated above.

Lorentizian Fitting

The Lorentzian fitting was done using the equation a + b / sqrt(1+((x-c)/d*2), where a = constant background, b = peak height above background, c = peak frequency, d = full width at half max. 

The fitting is still being edited and optimized. We will crop the data to zoom in around the peak more.

The Lorentzian fit of the magnitude shows ~10Hz of resolution. (See attachment 6 for the carrier at 8A and attachment 7 for HOM 1 at 9A)

We're working on fitting the full complex data.

 

 

Attachment 1: heater_setup.jpg
heater_setup.jpg
Attachment 2: heater_wiring.jpg
heater_wiring.jpg
Attachment 3: notes.txt
Notes for running scans:
1. when first turning on Agilent, set initial stuff
    > cd /users/annalisa/postVent/20180718
    > AGmeasure TFAG4395Atemplate.yml
2. tweak arm alignment and offset PLL
    > sitemap (then IFO --> ALIGN and also PSL --> AUX)
    > to increase 
3. make sure X-arm is misagligned (hit '! Misalign' button for ITMX, ETMX) 
3. run scan
    > python AGfast.py startfreq stopfreq points
... 36 more lines ...
Attachment 4: FSR_clipped.pdf
FSR_clipped.pdf
Attachment 5: cylinderHOM5.pdf
cylinderHOM5.pdf
Attachment 6: pt8A_CAR.pdf
pt8A_CAR.pdf
Attachment 7: pt9A_HOM1.pdf
pt9A_HOM1.pdf
  14405   Fri Jan 18 15:34:37 2019 gautamUpdateThermal CompensationElliptical reflector part number

Nobody documented this, but here is the part number with mechanical drawings of the elliptical reflector installed at EY: Optiforms E180. Heater is from Induceramics, but I can't find the exact part which matches the dimensions of the heater we have (diameter = 3.8mm, length = 30mm), perhaps it's a custom part?

The geometry dictates that if we want the heater to be at one focus and the ETM to be at the other, the separation has to be 7.1 inches. It certainly wasn't arranged this way before. It seems unrealistic to do this without clipping the main beam, I propose we leave sufficient clearane between the main beam and the reflector, and accept the reduced heating efficiency. 

Thanks to Steve for digging this up from his secret stash.

  14545   Mon Apr 15 22:55:34 2019 gautamFrogsThermal CompensationLab thermostat adjusted

It is feeling cold in the office area. According to the digital wall clock near the coffee machine, it is 19C. Rana bumped the thermostat setpoint up by 2F (from 75F to 77F). We need to setup long-term monitoring.

  7924   Tue Jan 22 09:18:50 2013 SteveUpdateTip - Tilttip tilt bases ordered

The corrected drawing base for tip tilt with coils are going to the shop. The will be back by the end of the week.

Attachment 1: TTbc.PDF
TTbc.PDF
  7925   Tue Jan 22 11:09:58 2013 SteveUpdateTip - TiltSS mirror holder ordered

Koji's design of the SS  2" mirror holder with flexure spring optic retainer  like Polaris-K1 has been ordered. We are getting just one to see it's effect on the hysteresis.

Attachment 1: D1201574_v1_Tip-Tilt_Mirror_Holder.SLDDRW
  14047   Mon Jul 9 17:29:28 2018 Udit KhandelwalSummaryTip-TIltTipTilt mirror holder final changes

Final Summary of changes to mirror holder in Tip-Tilt holder.

Determining minimum range for Side Clamp:

1. The initial distance b/w wire-release point and mirror assembly COM = 0.265 mm


2. But this distance is assuming that wire-release point is at mid-point of clamp. So I'm settling on a range of +/- 1mm. The screenshots below confirm range of ~1mm between (1) side screw & protrusion and (2) clamp screw and clamp.

Determining length of tilt-weight assembly rod at the bottom to get \pm 20mRad range

The tilt-weight assembly is made from following Mcmaster parts:
Rod   - 95412A864 18-8 SS  #2-56 Threaded Rod
Nuts  - 91855A103 18-8 SS #2-56 Acorn Cap Nut

Since the weights are fixed, only rod length can be changed to get the angle range.

tan \theta =\frac{d}{h}

d= h \times tan\theta = 34.25\text{mm} \times tan(20 \text{mRad}) = 0.69 \text{mm}
So a range of 1 mm between nut's inner face and mirror-holder face should be enough. Since holder is 12 mm thick, rod length = 12mm + 2 x 1mm + 2 x (nut length) = 12 + 2 + 9.6 = 23.6 mm = 0.93 inch. So a 1" rod from Mcmaster will be fine.

Attachment 4: 2-1.png
2-1.png
  14439   Thu Feb 7 17:27:53 2019 KojiSummaryTip-TIltFive FiveNine Optics Optics delivered

5 PR3/SR3 optics from FiveNine Optics were delivered. The data sheets were scanned and uploaded to the following wiki page. https://wiki-40m.ligo.caltech.edu/Aux_Optics

  14442   Fri Feb 8 00:20:56 2019 gautamSummaryTip-TIltFive FiveNine Optics Optics delivered

They have been stored on the 3rd shelf from top in the clean optics cabinet at the south end. EX

Quote:

5 PR3/SR3 optics from FiveNine Optics were delivered. The data sheets were scanned and uploaded to the following wiki page. https://wiki-40m.ligo.caltech.edu/Aux_Optics

  14444   Fri Feb 8 20:35:57 2019 gautamSummaryTip-TIltCoating spec

[Attachment #1]: Computed spectral power transmissivity (according to my model) for the coating design at a few angles of incidence. Behavior lines up well with what FNO measured, although I get a transmission that is slightly lower than measured at 45 degrees. I suspect this is because of slight changes in the dispersion relation assumed and what was used for the coating in reality.

[Attachment #2]: Similar information as Attachment #1, but with the angle of incidence as the independent parameter in a continuous sweep. 

Conclusion: The coating behaves in a way that is in reasonable agreement with our model. At 41.1 degrees, which is what the PR3 angle of incidence will be, T<50 ppm, which was what we specified. The larger range of angles was included because originally, we thought of using this optic as a substitute for SR3 as well. But I claim that for the shorter SRC (signal recycling as opposed to RSE), we will not end up using the new optic, but rather go for the G&H mirror. In any case, as Koji pointed out, ~50 ppm extra loss in the RC will not severely limit the recycling gain. Such large variation was not seen in the MC analysis because we only varied the angle of incidence by +/- 0.5 degrees about the nominal design value of 41.1 degrees.

Attachment 1: specRefl.pdf
specRefl.pdf
Attachment 2: AoIscan.pdf
AoIscan.pdf
  14474   Tue Mar 5 15:56:27 2019 gautamSummaryTip-TIltDiscussion points about TT re-design

Chub, Koji and I have been talking about Udit's re-design. Here are a few points that were raised. Chub/Koji can add to/correct where necessary. Summary is that this needs considerable work before we can order the parts for a prototype and characterize it. I think the requirements may be stated as:

  1. The overall pendulum length should be similar to that of the SOS, i.e. ~0.3m (current length is more like 0.1m) such that the eigenfrequencies are lowered to more like ~1 Hz. Mainly we wan't to avoid any overlap with the stack eigenmodes. This may require an additional stiffening piece near the top of the tower as we have for the SOS. What is a numerical way to spec this?
  2. The center of the 2" optic should be 6" from the table.
  3. The mass of the optic + holder should be similar to the current design so we may use the same suspension wires (I believe they are a different thickness than that used for the SOS).
  4. Ensure we can extract any transmitted beams without clipping.
  5. Fine pitch adjustment capablity should be yyy mrad (20mrad?).
  6. We should preserve the footprint of the existing TTs, given the space constraints in vacuum. Moreover, we should be able to use dog-clamps to fix the tower in place, so the base plate should be designed accordingly.
  7. Keep the machining requirements as simple as possible while achieving the above requirements- i.e. do we really need rounded optic holder? Why not just rectangular? Similarly for other complicated features in the current design.

Some problems with Udit's design as it stands:

  1. I noticed that the base of the TT and the center of the 2" optic are 4" separated. The SOS cage base and center of 3" optic are separated by 6". Currently, there is an adaptor piece that raises the TT height to match that of the SOS. If we are doing a re-design, shouldn't we just aim for the correct height in the first place?
  2. Udit doesn't seem to have taken into account the torque due to the optic+holder in the pitch balancing calculations he did. Since this is expected to be >> that of any rod/screw we use for fine pitch balancing, we need to factor that into the calculation.
  3. For the coarse pitch adjustment, we'd need to slide the wire clamping piece relative to the optic holding piece. Rather than do this stochastically and hope for the best, the idea was to use a threaded screw to realize this operation in a controlled way. However, Udit's design doesn't include the threaded hole.
  4. There are many complicated machining features which are un-necessary.
  230   Wed Jan 9 20:36:42 2008 GoUpdateTreasureMoney in lab
Go's Desk.
Attachment 1: DSC_0370.JPG
DSC_0370.JPG
  259   Thu Jan 24 12:50:50 2008 JohnSummaryTreasureSugar Napoleons
Some pictures from the group meeting yesterday.
Attachment 1: Sweeties.pdf
Sweeties.pdf
  402   Tue Mar 25 15:56:09 2008 JohnUpdateTreasureAssorted pictures
Some pictures scavenged from the D40.
Attachment 1: D40.pdf
D40.pdf D40.pdf
  493   Fri May 23 08:24:24 2008 ranaAoGTreasureYoichi Aso has arrived !
Attachment 1: Colossus_back_(800_x_600)-thumb.jpg
Colossus_back_(800_x_600)-thumb.jpg
  737   Thu Jul 24 21:53:00 2008 ranaSummaryTreasureHigh School Tour group and the PMC
There was a tour today of 40 high school kids. I warned them that the lasers could burn out their
eyes
, that the vacuum could suck them through the viewports like tubes of spaghetti and that the
high voltage amps would fry their hair off.

One of them was taking a picture of the SOS in the flow bench and another one was whispering what
a dumb idea it was to leave a sensitive clean optic out where people might breathe on it. I told
one them to cover his mouth. The other one asked what was the glass block behind the SOS.

It was a spare PMC! s/n 00-2677 with a 279 nF capacitance PZT. I guess that this is the one that
Go brought from MIT and then left here. So we don't have to take the one away from Bridge in the
35 W laser lab.

We can swap this one in in the morning while the FSS people work on the reference cavity
alignment. Please email me if you object to this operation.
  976   Mon Sep 22 15:02:45 2008 ranaFrogsTreasureMantis found outside the 40m door at night
Attachment 1: mantis.JPG
mantis.JPG
  1132   Thu Nov 13 11:33:25 2008 AlbertoHowToTreasureMaking (good) Matlab figures
Just a little summary of some useful ways to change plot settings in Matlab that I wanted to share and remember for the future:

http://saig.phys.ualberta.ca/toolbox/Matlab/making_figures.html
  1618   Thu May 21 18:21:57 2009 ranaSummaryTreasureYoichi's words

Yoichi's final words on what do next with the interferometer (as of 5 PM on May 21, 2009):

  1. Measure laser noise couplings in spring and anti-spring configurations.
  2. Dewhitening filter turn on for the ETMs.
  3. Noisebudget - import from the sites.
  4. Stabilize CM handoff.

My personal sub-comments to these bullets:

  1. For the laser noise I'm not sure that we will be able to understand these if the couplings are mainly from junk light due to accidental HOM resonances.
  2. WE should look into putting a static passive stage of filtering into the ETMs if warranted by the NB.
  3. Because of the sad track record with this, I will start us off this time by importing and modifying the H1/L1 versions.
  4. I guess we can do this by just acquiring on MC2 with the huge CARM offset. It works for the single arm so it should work for offset CARM.
  2012   Mon Sep 28 11:52:23 2009 JenneUpdateTreasureOAF screen added to the screenshots webpage

I used Kakeru's instructions in elog 1221 to add the C1OAF screen (still called C1ASS_TOP) to the medm screenshots webpage.  The tricky part of this is figuring out that the file that needs editing is in fact in /cvs/cds/projects/statScreen, not /cvs/cds/caltech/statScreen, as claimed in the entry. 

  2410   Mon Dec 14 12:13:52 2009 JenneUpdateTreasureWe are *ROCKSTARS* ! IFO is back up

[Jenne, Kiwamu, Koji]

We got the IFO back up and running!  After all of our aligning, we even managed to get both arms locked simultaneously.  Basically, we are awesome. 

 This morning, we did the following:

*  Turned on the PZT High voltages for both the steering mirrors and the OMC.  (For the steering mirrors, turn on the power, then hit "close loop" on each.  For the OMC, hit Output ON/OFF).

*  Looked at the PZT strain gauges, to confirm that the PZTs came back to where they had been.  (Look at the snapshot of C1ASC_PZT_Al)

*  Locked all components of the PSL (This had already been done.)

*  Removed beam dump which was blocking the PSL, and opened the PSL mechanical shutter.  Light into the IFO!

*  Locked the Mode Cleaner.  The auto-locker handled this with no problem.

*  Confirm that light is going through the Faraday.  (Look at the TV sitting on top of MC13 tank...it shows the Faraday, and we're hitting the input of the Faraday pretty much dead-on).

*  Look at IP_ANG and IP_POS.  Adjust the steering mirrors slightly to zero the X&Y readings on IP_ANG.  This did not change the PZTs by very much, so that's good.

*  Align all of the Core Optics to their OpLev positions.

*  On the IFO_Align screen, save these positions.

*  Run the IFO_Configure scripts, in the usual order.  (Xarm, Yarm, PRM, DRM).  Save the appropriate optics' positions after running the alignment scripts.  We ended up running each alignment script twice, because there was some residual misalignment after the first iteration, which we could see in the signal as viewed on DataViewer (Either TRX, TRY, or SPOB, for those respective DoFs).

*  Restore Full IFO.

*  Watch the beauty of both arms and the central cavity snapping together all by themselves!  In the attached screenshot, notice that TRX and TRY are both ~0.5, and SPOB and AS166Q are high.  Yay!

Conclusions: 

*  The wiping may have helped.  While aligning X and Y separately, TRX got as high as ~1.08, and TRY got as high as 0.98  This seems to be a little bit higher than it was previously.

*  Since everything locked up in pretty short order, and the free swinging spectra (as measured by Kiwamu in elog 2405) looks good, we didn't break anything while we were in the chambers last week.  Excellent.

*  We are now ready for a finesse measurement to tell us more quantitatively how we did with the wiping last week.

 

Attachment 1: Jenne14Dec09_IFOlocked.png
Jenne14Dec09_IFOlocked.png
  2411   Mon Dec 14 13:08:33 2009 KojiUpdateTreasureLOCKSTARS

Good job guys. What I did was saying "I don't know", "Maybe", and "Ants...".

Now you can proceed to measurements for the visibility and the cavity pole! 

Quote:

[Jenne, Kiwamu, Koji]

We got the IFO back up and running!  After all of our aligning, we even managed to get both arms locked simultaneously.  

  2412   Mon Dec 14 13:17:33 2009 robUpdateTreasureWe are *ROCKSTARS* ! IFO is back up

 

 

Attachment 1: two-thumbs-up.jpeg
two-thumbs-up.jpeg
  2413   Mon Dec 14 14:16:14 2009 AlbertoUpdateTreasureLOCKSTARS

Quote:

Good job guys. What I did was saying "I don't know", "Maybe", and "Ants...".

Now you can proceed to measurements for the visibility and the cavity pole! 

Quote:

[Jenne, Kiwamu, Koji]

We got the IFO back up and running!  After all of our aligning, we even managed to get both arms locked simultaneously.  

 I'm going to do it right now.

  2489   Fri Jan 8 18:20:12 2010 steveMetaphysicsTreasureRob now can concentrate on his thesis

We are celebrating Rob's promotion to thesis poetry.  These pictures were taken on December 9, 2009

Rob has finished all his measurements in the lab and is officially well prepared to graduate.

rob1.JPGrob2.JPG rob3.JPG

 

  2560   Tue Feb 2 15:30:03 2010 AlbertoFrogsTreasureWild Oats
FYI. Sitting on the top shelf of George I found an opened jar of raspberry jam and an opened jar of creamy peanut butter. Both are branded Wild Oats Market.
 
Wikipedia:
"Wild Oats Markets was an operator of natural foods stores and farmers markets in North America... Whole Foods officially completed their buyout of Wild Oats on August 27, 2007 [...]"
  3263   Thu Jul 22 01:02:08 2010 ranaUpdateTreasureMonsters, LNVR, and Phase noise

On Picasa

  3265   Thu Jul 22 07:19:56 2010 AlbertoUpdateTreasureMonsters, LNVR, and Phase noise

Quote:

On Picasa

 "They (shellfish) shall be an abomination to you; you shall not eat their flesh, but you shall regard their carcasses as an abomination." (Leviticus 11:11)

  3459   Mon Aug 23 21:04:14 2010 JenneUpdateTreasureSeriously?

Bad CDS team. Bad.

BadKiwamu_CDSsetup.jpg

 

 

 

  3460   Mon Aug 23 22:11:52 2010 kiwamuUpdateTreasureRe:Seriously?

Woops, I am sorry about that. I've just cleaned them up.

Quote:

Bad CDS team. Bad. 

  3512   Thu Sep 2 01:48:23 2010 JenneFrogsTreasureNot cool....

This totally creeped me out when I found it wandering around on the floor not so far from my desk:

CreepyBug.jpg

  3592   Tue Sep 21 15:33:02 2010 steveMetaphysicsTreasureWagonga alart

John Miller has arrived from Australia with 3 bags of  Wagonga Coffee. Trade bargaining has started on

250 mgs of Sumatran Mandehling, Timur and Papua New Guine.

Attachment 1: P1060866.JPG
P1060866.JPG
Attachment 2: P1060872.JPG
P1060872.JPG
  3751   Thu Oct 21 10:44:56 2010 steveMetaphysicsTreasure1987 supernova tapes plus....?

I'm cleaning out to make room for our new optical cabinet. Are we keeping these? There are  ~20  pieces of 10" od 1" wide tapes and large number of cassettes.

AJW,  Zucker,  Stuart A and Koji were notified in this matter.

Alan suggested to save data of Bruce Allen paper of observation of binary neutron stars in the 40m on 1994 November 14-20 and save back up tapes of his period in the 40m.

Mike: reels are not readable any more, it is time to let go

Attachment 1: P1060932.JPG
P1060932.JPG
  3826   Fri Oct 29 16:39:01 2010 JenneUpdateTreasureOld Green suspension towers disassembled

[Jenne, Joonho]

At Koji's request, we disassembled 2 of the old Green suspension towers that have been sitting along the X-arm forever (read that last word in a 'Sandlot' voice.  Then you'll know how long the suspensions have been sitting there).

They are now hanging out in plastic trays, covered with foil.  They will now be much easier to store.

We should remember that we have these, particularly because the tables at the top are really nice, and have lots of degrees of freedom of fine adjustment.

 

Steve:

Atm1, there is one more of these old suspension towers

Atm2, disassembled

Attachment 1: P1070014.JPG
P1070014.JPG
Attachment 2: P1070015.JPG
P1070015.JPG
  3917   Sun Nov 14 16:40:46 2010 JenneUpdateTreasureActivities related to OSEM measurement

[Valera, Jenne]

We pondered the idea of clamping the PRM optic to measure the OSEM noise.  So we opened up the BS tank to give this a try.  We rediscovered that Jenne is too short to reach the other side of the PRM tower, so we couldn't fully clamp the optic (when is Jaime coming again? He's kind of tall...)  If we only did the back 2 EQ stops, the optic would still be able to rock, and thus defeat the purpose of clamping anyway.  So we didn't go for it. 

While we were in there we saw that the SRM OSEMs were just hanging out on the table, and decided to go with them.  See Valera's elog for details on our measurement.  We closed up the tank without making any changes to anything.

In other news, we still need to figure out how to change up the connectors to get those OSEMs over to the ITM table.  This needs to happen pretty soonish. 

  4443   Fri Mar 25 08:58:38 2011 AidanUpdateTreasureCleared stuff off SP table

I tidied up some of the stuff that was on the SP table. The ISS box that has been sitting on there for months is now underneath the X-arm on top of the spare Marconi which is stored there.

 

 

Attachment 1: ISS_box.JPG
ISS_box.JPG
  4695   Wed May 11 22:54:53 2011 JenneUpdateTreasureETMY trans QPD installed

I put the ETMY trans QPD in. 

The ETMY trans beam was already going toward the TRY DC PD, and a CCD camera.  I put a beam splitter in that beam (reducing the power to TRY and the CCD by 50%), and sent my picked-off beam to the ETMY QPD.  Since there is a lens in this path to focus the beam onto TRY and the camera, I put the QPD ~the same distance from the lens as the camera.  Due to space requirements (because of all the green stuff on the table now), I had to put a Y1 turning mirror between the beam splitter and the QPD.  The beam is aligned onto the PD, although the signal isn't super strong.  When the PD is blocked, the sum is ~(-92 counts).  When the beam is on the PD, the sum is ~(-78 counts). 

  5128   Fri Aug 5 20:44:26 2011 jamieMetaphysicsTreasureFilm crew here Monday morning

Just a reminder that a film crew will be here Monday morning, filming Christian Ott for some Discovery channel show.

They are slated to be here from 8am to 12:30pm or so.  They will take a couple of shots inside the lab, and the rest of the filming should be of Christian in the control room (which they will "clean up" and fit with "sexy lighting").  I will try to be here the whole time to oversee everything.

  5129   Fri Aug 5 22:54:29 2011 kiwamuMetaphysicsTreasureCrane crew here Monday morning

Also, according to Steve, there will be some crane guys for fixing the Y end crane issue (#5124) Monday morning.

Quote from #5128

 a film crew will be here Monday morning. They are slated to be here from 8am to 12:30pm or so. 

  5139   Mon Aug 8 13:24:00 2011 steveMetaphysicsTreasure Monday morning

Quote:

Just a reminder that a film crew will be here Monday morning, filming Christian Ott for some Discovery channel show.

They are slated to be here from 8am to 12:30pm or so.  They will take a couple of shots inside the lab, and the rest of the filming should be of Christian in the control room (which they will "clean up" and fit with "sexy lighting").  I will try to be here the whole time to oversee everything.

Konecrane Fred was early this morning. He diagnosed the ETMY crane horizontal drive gear box dead and left just before the film crew showed up.

New gear box should be here by the end of this week for installation.

The lab air quality is high ~20,000 counts of particles of 0.5 micron.  Keep an eye on this before you open the chamber.

Attachment 1: P1080147.JPG
P1080147.JPG
  5257   Wed Aug 17 17:51:54 2011 JenneUpdateTreasurePrepared for drag wiping

While waiting for the IFO team to align things (there were already ~5 people working on a ~1 person job...), I got all of our supplies prepped for drag wiping in the morning. 

The syringes are still on the flow bench down the Xarm.  I put fresh alcohol from unopened spectrometer-grade bottles into our alcohol drag wiping bottles.

The ITMs already had rails for marking their position in place from the last time we drag wiped.  I placed marker-rails for both ETMs.

  5262   Thu Aug 18 10:59:04 2011 steveUpdateTreasurePrepared for drag wiping

Quote:

While waiting for the IFO team to align things (there were already ~5 people working on a ~1 person job...), I got all of our supplies prepped for drag wiping in the morning. 

The syringes are still on the flow bench down the Xarm.  I put fresh alcohol from unopened spectrometer-grade bottles into our alcohol drag wiping bottles.

The ITMs already had rails for marking their position in place from the last time we drag wiped.  I placed marker-rails for both ETMs.

 We should use the deionizer before drag wiping with isopropanol.

  5281   Tue Aug 23 01:05:40 2011 JenneUpdateTreasureAll Hands on Deck, 9am!

We will begin drag wiping and putting on doors at 9am tomorrow (Tuesday). 

We need to get started on time so that we can finish at least the 4 test masses before lunch (if possible). 

We will have a ~2 hour break for LIGOX + Valera's talk.

 

I propose the following teams:

(Team 1: 2 people, one clean, one dirty) Open light doors, clamp EQ stops, move optic close to door.  ETMX, ITMX, ITMY, ETMY

(Team 2: K&J) Drag wipe optic, and put back against rails. Follow Team 1 around.

(Team 3 = Team 1, redux: 2 people, one clean, one dirty) Put earthquake stops at correct 2mm distance. Follow Team 2 around.

(Team 4: 3 people, Steve + 2) Close doors.  Follow Team 3 around.

Later, we'll do BS door and Access Connector.  BS, SRM, PRM already have the EQ stops at proper distances.

 

  5918   Wed Nov 16 21:01:08 2011 JenneUpdateTreasureeom box

I made a super sweet new foam box for our EOM.  It's awesome, and should be reasonably easy to duplicate.  Check out the PHOTOS!

Notes:

* I didn't think I was going to cover the inside of the box at first, since the foam is non-fuzz-generating, but Koji suggested it would be a good idea anyway.  The foam was cut perfectly to the EOM, so adding the tape inside makes it a tight fit.  Especially height-wise...leave a little space next time.

* To cover the insides of the optical path holes, do it in 2 parts.  One half-cylinder, and then another.  Way easier than trying to do the whole thing at once.  Also, pre-cut the tabs on both sides of the foil before inserting.  Then you just have to grab the tabs with tweezers and flatten them, and they hold the aluminum tape in place. 

* Having 1" wide, 2" wide and 3" wide aluminum tape was handy.  3" to make the top, 2" for the sides, and 1" for the inside of the holes. 

  8127   Thu Feb 21 13:34:35 2013 JenneUpdateTreasureIR card removed

Quote:

The sensor card on the bottom of the chamber was not salvaged yet.

 Yuta retrieved the IR card that had fallen to the bottom of the IOO chamber, just before we put on the access connector yesterday.  The clean "pickle picker" long grabber tool worked wonders.

  8544   Tue May 7 19:58:28 2013 ranaFrogsTreasurerabbitt whole

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C1IOO_LOCKMC_BAK.adl      C1IOO_MC_ASS_PIT_LOCKIN.adl  C1IOO_WFS1_SETTINGS.adl      C1IOO_WFS_MASTER.adl~
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C1IOO_MC_ASS_LOCKIN3.adl  C1IOO_QPDS.adl               C1IOO_WFS_HEADS.adl.old      master
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bash: help: no help topics match `me'.  Try `help help' or `man -k me' or `info me'.

  9028   Mon Aug 19 10:16:15 2013 PicassoMetaphysicsTreasureoutsider art

 ranasglory.png

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