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  40m Log, Page 204 of 341  Not logged in ELOG logo
ID Date Authorup Type Category Subject Text Attachments
  12024   Sun Mar 6 15:24:05 2016 gautamUpdateCDSFB down againI came in to check the status of the nitrogen
and noticed that the striptool panels in
the control room were all blank.
 58.png 
  12026   Mon Mar 7 23:51:36 2016 gautamUpdateGreen LockingLaser swap - some improvement


 PomonaTF.pdfXPDH.pdfYPDH.pdfgreenbeat_20160307.pdf 
  12029   Thu Mar 10 16:29:32 2016 gautamUpdateendtable upgradeInventory checkI did a quick sweep of the lab to find
out what hardware has already been acquired
for the X-end table upgrade. The attached
 Inventory_check.pdfDoubler_comparison.pdf 
  12033   Mon Mar 14 22:42:23 2016 gautamUpdateendtable upgradeInventory check


  
  12056   Wed Mar 30 17:38:52 2016 gautamUpdateendtable upgradeX end table proposed layout Attachment 1: This
is a photo of the current X end table optical
layout with the beampaths of the various
 ETMX_3x2.JPGlayout_details_20160328.pdfETMX_proposed_layout.pdf 
  12058   Thu Mar 31 19:49:31 2016 gautamUpdateendtable upgradeproposed layout v2The major changes from the previous layout:


I've depicted the Green
reflected beam path more accurately - I approximately measured
 ETMX_proposed_layout_v2.pdf 
  12060   Mon Apr 4 10:59:12 2016 gautamUpdateendtable upgradeproposed layout v3I realized I had overlooked an important
constraint in the layout, which is that the
enclosure will have two supports that occupy
 ETMX_proposed_layout_v3.pdfIR_modematch.pdfGreen_modematch.pdfXendALaMode.zipETMX_proposed_layout_dimensions.dwg 
  12061   Mon Apr 4 15:04:14 2016 gautamUpdateendtable upgradeCOMPONENT REMOVAL
I'm
planning to start removing components from
  
  12064   Tue Apr 5 14:16:34 2016 gautamUpdateCDSBLRMS for optics suspensions - library block UPDATEDAs discussed in a Wednesday meeting some
time ago, we don't need to be writing
channels from BLRMS filter modules to frames
  
  12065   Wed Apr 6 17:52:21 2016 gautamUpdateendtable upgradeFirst contact cleaning commencedI've begun cleaning the optics that
will eventually go back onto the newly installed
X-endtable. We decided that First Contact
  
  12066   Thu Apr 7 12:51:24 2016 gautamUpdateendtable upgradeBeam height differencesSteve has finished installing the enclosure
on the new endtable. So Eric and I decided
to try and lock the X arm and measure the
  
  12073   Wed Apr 13 00:56:07 2016 gautamUpdateendtable upgradeX endtable repopulationOver the last couple of days, I've
been working on restoring the optical layout
on the X-endtable. Some notes about the status
  
  12075   Wed Apr 13 18:25:07 2016 gautamUpdateendtable upgradeLightwave health check[Koji,gautam]

Lightwave NPRO information:

Model: 126-1064-700
  
  12078   Fri Apr 15 18:35:57 2016 gautamUpdateGeneralNew AUX laser measurementsI've performed the temperature sweep
of PSL vs Innolight 1W AUX laser.


I followed the procedure
 PSL_AUX_TEMP_SCAN.pdfPSL_AUX_TEMP_SCAN.mat 
  12079   Fri Apr 15 18:38:12 2016 gautamUpdateendtable upgradeLightwave health check - NO IMPROVEMENTI re-measured the power levels today.

We have ~205mW out of the NPRO,
and ~190mW after the Faraday. It doesn't
  
  12080   Fri Apr 15 23:11:49 2016 gautamUpdateGeneralInnolight 1W moved to SP tableI
have moved the 1W Innolight + controller
from the PSL table to the SP table for beam
  
  12081   Mon Apr 18 00:29:00 2016 gautamUpdateGeneralBeam profiling + injection current scanSummary

I've finished up the remaining
characterization of the repaired 1W Innolight
 6x 
  12083   Tue Apr 19 18:37:29 2016 gautamUpdateendtable upgradeLaser swap + optical layoutSummary of work done over the last
two days


Lightwave NPRO
 IR_modematch_19April2016_2.pdf 
  12085   Thu Apr 21 14:25:52 2016 gautamUpdateendtable upgradeGreen light recoveredI've made progress on the new layout
up to the doubling oven. After doing the
coarse alignment with the diode current to
 IMG_6567.JPGIMG_6568.JPGCVI_reflectivity.jpeg 
  12090   Tue Apr 26 23:19:42 2016 gautamUpdateendtable upgradeGreen aligned to arm - high order mode flashes seenAttachment #1

Layout as of today. Most of the
green path is done. The Green REFL PD + PZT
 IMG_2219.JPGIMG_2220.JPG 
  12095   Thu Apr 28 00:41:08 2016 gautamUpdateendtable upgrademore progress - Transmon PD installedThe IR Transmon system is almost completely
laid out, only the QPD remains to be installed.
Some notes:
  
  12099   Fri Apr 29 00:55:46 2016 gautamUpdateendtable upgradegreen PDH locked to XarmUsing the modulation frequency suggested
here,
I hooked up the PDH setup at the X-end and
  
  12100   Fri Apr 29 16:05:23 2016 gautamUpdateendtable upgradeCleaning ETMX vacuum dirty windowAfter a second round of F.C. application,
I think the window is clean enough and there
are no residual F.C. pieces anywhere near
 IMG_0755.JPG 
  12104   Mon May 2 19:14:18 2016 gautamUpdateendtable upgradeOptical layout almost completeWith Steve's help, I installed the
Oplev earlier today. I adjusted the positions
of the two lenses until I deemed the spot
 ETMX_wedge.pdf 
  12105   Thu May 5 03:05:37 2016 gautamUpdateendtable upgradeALS status update[ericQ, gautam]

Today we spent some time looking
into the PDH situation at the X end. A summary
 ALS_noiseSpec_5May2016_2.pdfCoherence_5May2016.pdfimage.jpeg 
  12109   Thu May 5 21:28:44 2016 gautamUpdateendtable upgradeInnolight PZT capacitanceI suggested
in an earlier elog that after the repair
  
  12116   Thu May 12 14:29:58 2016 gautamUpdateVACRGA back up and runningIt looks like the hardware reset did the
trick. Previously, I had just tried ssh-ing
into c0rga and rebooting it. At the time,
 RGAscan_12May2016.png 
  12120   Wed May 18 01:10:22 2016 gautamUpdateCOCFinesse modellingI've been working on putting together
a Finesse model for the current 40m configuration.
The idea was to see if I could reproduce
 arms.pdfPRC.pdfSRC.pdfFinesse_model.zip 
  12124   Fri May 20 17:36:06 2016 gautamUpdateLSCNew stands for TransMon/Oplev QPDsAs we realized during the EX table switch,
the transmitted beam height from the arm
is not exactly 4" relative to the endtable,
  
  12130   Tue May 24 22:49:02 2016 gautamUpdateCOCFinesse modelling - mode overlap scansSummary:

Having played around with a toy finesse
model, I went about setting up a model in
 9x 
  12190   Thu Jun 16 15:57:46 2016 gautamUpdateCOCContrast as a function of RoC of ETMXSummary

In a previous elog, I demonstrated
that the RoC mismatch between ETMX and
 contrastDefect.pdffinesseCode.zip 
  12194   Thu Jun 16 23:02:57 2016 gautamUpdateCOCContrast as a function of RoC of ETMX


 contrastDefect.pdf 
  12195   Fri Jun 17 15:22:31 2016 gautamUpdateVACN2 supply line restored after retiling


 c0vac_06172016.png 
  12204   Mon Jun 20 18:07:15 2016 gautamUpdateCOCContrast as a function of RoC of ETMX


 contrastDefectComparison.pdf 
  12219   Tue Jun 28 16:06:09 2016 gautamUpdateCOCRC folding mirrors - further checksHaving investigated the mode-overlap as
a function of RoC of the PRC and SRC folding
mirrors, I've now been looking into possible
 C1_HOMcurves_Y.pdfC1_HOMcurves_DR.pdf 
  12234   Thu Jun 30 16:21:32 2016 gautamUpdateCOCSideband HOMs resonating in arms[EricQ, gautam]

Last night, we set about trying
to see if we could measure and verify the
 image.jpegC1_HOMcurves_Y.pdfC1_HOMcurves_X.pdf 
  12247   Tue Jul 5 23:38:42 2016 gautamUpdateGeneralVent progress - ETMX SUS Coil driver electronics investigationWith Koji's help, I've hacked together
an arrangement that will allow us to monitor
the output of the coil driver to the UL coil. 
 image.jpeg 
  12261   Wed Jul 6 22:58:01 2016 gautamUpdateGeneralVent progress - ETMX SUS Coil driver electronics investigationI've made a few changes to the monitoring
setup in the hope we catch a glitch in the
DAC output/ sus coil driver electronics.
  
  12262   Wed Jul 6 23:01:03 2016 gautamUpdateGeneralpianosa monitor deadOne of the pianosa monitors has ceased
to function 
  
  12265   Thu Jul 7 10:49:03 2016 gautamUpdateGeneralVent progress - ETMX SUS Coil driver electronics investigation


 UL_glitchMon_Striptool.png 
  12271   Fri Jul 8 11:35:45 2016 gautamUpdateGeneralVent progress - ETMX SUS Coil driver electronics investigationYesterday, I expanded the extent of the
ETMX suspension coil driver investigation.
I set up identical monitors for two more
 coilGlitchMon.png 
  12281   Fri Jul 8 21:22:38 2016 gautamUpdateGeneralVent progress - ETMX SUS Coil driver electronics investigationWhile ETMX is out, I'm leaving
the larger amplitude excitations to the coils
on over the weekend, in case any electronic
  
  12289   Mon Jul 11 15:13:22 2016 gautamUpdateGeneralVent progress: in-date First Contact procuredI have obtained 2x100cc bottles of in-date
first contact from Garilynn (use before date
is 09/14/2016) for cleaning of our test-masses.
 image.jpeg 
  12327   Fri Jul 22 23:03:23 2016 gautamUpdateGeneralETMX suspension - progress[ericq, gautam]

Summary:

Today, we attempted to progress
 IMG_2828.JPGIMG_2826.JPGIMG_2821.JPGIMG_2822.JPGIMG_2823.JPG 
  12335   Mon Jul 25 20:37:46 2016 gautamUpdateGeneralETMX suspension - Side OSEM test[Lydia, gautam]

Summary: We
did some preliminary tests to check if at
 osem_test_2016_07_25.png 
  12340   Tue Jul 26 18:07:57 2016 gautamUpdateGeneralETMX suspension - Further OSEM TestsToday, we did the following:


Once again, inserted all
four face OSEMs till the sensor voltage readouts
 OSEM_spectra.pdf 
  12347   Thu Jul 28 13:49:44 2016 gautamUpdateGeneralETMX magnets re-reglued


 ETMX_sideMagnet.JPGETMX_sideMagnet_zoomed.JPG 
  12349   Thu Jul 28 17:48:17 2016 gautamUpdateGeneralETMY LR magnet broke offWhile ETMX magnets were curing, I wanted
to try and suspend ETMY in the endchamber,
put in the OSEMS and see if the magnets aligned
  
  12357   Fri Jul 29 20:12:54 2016 gautamUpdateSUSthird time - no luck[lydia, gautam]

Summary:
  
  12362   Wed Aug 3 00:15:39 2016 gautamUpdateSUSETMX suspended[lydia, steve, ericq, gautam]

Summary:
  
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